{"title":"Top end","description":"","products":[{"product_id":"oem-honda-ruckus-replacement-cylinder-head","title":"OEM Honda Ruckus Replacement Cylinder Head","description":"OEM Honda Ruckus Cylinder Head is a direct and stock replacement. If you've blown up your scooter or you need a completely new head due to age and usage, this is the part you'll want. Since this an OEM component all the specs are stock. Keep in mind this is just the cylinder head and does not include the valves or other components required to make the head run.","brand":"Honda OEM","offers":[{"title":"Default Title","offer_id":49166091157788,"sku":"12200-GEZ-610","price":160.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/12200-gez-610-00.jpg?v=1718885298"},{"product_id":"malossi-top-end-gasket-set-yamaha-zuma","title":"Malossi Top End Gasket Set Yamaha Zuma","description":"\u003cp\u003eMalossi Top End Gasket Replacement Kit for the Yamaha Zuma 2-Stroke 50cc are direct replacements that work specifically for Malossi Kits. This includes the following kits listed below. These are higher quality gaskets that meet and exceed OEM quality. Whatever the reason for the need, we have the Malossi replacement cylinder head gasket for Malossi Cylinder Kits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eYamaha Zuma 50cc \u003c\/li\u003e\n\u003cli\u003eMineralli Air Cooled Engines\u003c\/li\u003e\n\u003cli\u003eM317083 Malossi Sport\u003c\/li\u003e\n\u003cli\u003eM318437 Malossi MHR Rep\u003c\/li\u003e\n\u003cli\u003eM318403 Malossi MHR Race Cylinder 50cc\u003c\/li\u003e\n\u003cli\u003eM318440 Malossi MHR Race Cylinder 70cc\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Malossi","offers":[{"title":"Default Title","offer_id":49166103839004,"sku":"M1175690C","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/m1175690c-00.jpg?v=1718885467"},{"product_id":"drowsports-ls-honda-grom-4-valve-181cc-performance-cylinder-kit-gen-2","title":"DROWsports LS181 4 Valve  Honda Grom \/ Monkey  Performance Cylinder Kit Gen 2","description":"\u003cp\u003eDROWsports LS 4v 181cc Performance Cylinder Kit for the Honda Grom\/MSX125 and Honda Monkey was designed specifically for the KOSO Grom 4v Head. We wanted to offer an affordable upgrade for the KOSO 4 Valve Head. Taking features from the 170cc piston like; lightweight piston, strutted design piston, radius edge dome etc and applied it to our kit. We love everything about the 61mm (170cc) KOSO but we wanted a little more displacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePiston Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eForged Piston\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe 4 valve piston comes forged, which is one of the best options for performance and reliability. Forged pistons compared to cast pistons are much stronger and more reliable due to their manufacturing process. The forging process gives it stronger structural integrity over cast pistons. Forged has a smooth and consistent grain structure due to the heat and pressing process.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eLightweight\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003e(Not all forged piston are the same) Compared to KOSO 61mm 4 valve pistons, our 63mm piston only weights 10g more and the complete piston with rings and wrist pin only weights 8.5g more. Having a lightweight and durable piston will help achieve more power and less strain.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eCNC Machined\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eOnce these are finished being forged, they are precision CNC machined. Machining it versus pouring metal into a cast allows the piston to have higher tolerances. This is a more expensive process but provides the highest performance option available. For this reason alone, it allows the best seal with the piston rings inside the cylinder.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eStrutted Piston Skirt\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe piston skirt utilizes a strutted design over a full round design. Having a strutted design not only reduces the weight but provides key points that can be machined to increase overall piston strength where the rods connect. This characteristic shaves off undesired weight and can be designed to help keep piston structure sturdy. This also helps with less friction due to reduced amounts of material against the sidewall of the cylinder.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eMachined Radius Edge\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eEach edge on the crown has been machined with a radius edge to eliminate possible hot spots which yield better flame travel. This will prevent damage to the piston in one particular area.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eWrist Pin Broaches \u0026amp; Double Pin Oiler\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eEvery performance piston requires proper lubrication which is commonly forgotten about once it comes down to the actual piston. Our design includes specialized oiler grooves inside the wrist pin location. The oil enters the grooves through the broached machined ports. The broaches are machined precisely to allow the proper amount of oil in for lubrication. It helps with preventing piston pin wear and seizing by keeping the entire pin oiled.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eFrictionless Coating\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eEach piston comes with a specialized coating on the skirt edges that reduces piston slap and is made to be frictionless. This allows the piston to move even more freely in the cylinder. This coating reduces scuffing and provides back-up lubrication and works well with engines with longer rods and Nickasil cylinders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eV-Shaped Accumulator Groove\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe V-Shaped groove that sits between the first and second ring was machined with an intentional purpose of relieving the top ring by adding volume between them. What it does is accumulates residual gasses from the combustion chamber. This will help prevent premature wear on the rings and provides an overall improved ring seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCylinder Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCylinder Performance\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eDROWsports 63mm Big Bore Cylinders are all machined and specially designed for performance and reliability. Since these cylinders are paired with such a high-performance cylinder and cylinder head, we had to make sure it lasts! This cylinder is similar to the KOSO 170cc cylinder except we've expanded on it to create an even more durable product.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eCeramic Coated Cylinder\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe ceramic cylinder was a clear choice for heat dissipation and reliability. This type of cylinder creates a stronger exterior surface while efficiently alleviating the heat.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eElectroplated Nikasil Walls\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eWe've combined this with another unique coating for the ultimate cylinder performance. The inside wall is electroplated with Nikasil. Silicone Carbide is an extremely hard ceramic compound that is dissolved and electroplated onto the cylinder walls using Nickel. This process makes the cylinder walls even more durable and allows the engine tolerances to be much tighter. Tighter tolerances mean better performance capabilities.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e4 Valve 63mm Forged Piston\u003c\/li\u003e\n\u003cli\u003e181cc Ceramic Cylinder\u003c\/li\u003e\n\u003cli\u003ePiston Rings\u003c\/li\u003e\n\u003cli\u003ePiston Pin\u003c\/li\u003e\n\u003cli\u003ePiston Clips\u003c\/li\u003e\n\u003cli\u003eHead Gasket\u003c\/li\u003e\n\u003cli\u003eBase Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder-and-piston-only upgrade\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003eRequires existing KOSO four-valve head\u003c\/li\u003e\n\u003cli\u003eDrop-in versus crankcase machining required\u003c\/li\u003e\n\u003cli\u003eRequired crank, rod, injector, throttle body, ECU and oil cooler\u003c\/li\u003e\n\u003cli\u003e24-26hp with aracer ecu on auto tune\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"DROWsports","offers":[{"title":"Default Title","offer_id":49166135820572,"sku":"MSX-2001-2","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/honda-grom-181cc-4v-cylinder-piston.jpg?v=1718885637"},{"product_id":"koso-honda-grom-monkey-61mm-4v-replacement-piston-kit","title":"KOSO Honda Grom\/Monkey 61mm 4V Replacement Piston Kit","description":"\u003cp\u003eKOSO's 4V Piston Kit for the Honda Grom \/ Monkey is a complete piston to be installed in a cylinder kit that fits 4V Cylinder Heads. This is a forged piston that measures 61mm and includes a piston, pin, pin clips, and a set of rings. These are completely forged pistons and is highly prefered over cast pistons. The reason is cast pistons are made up of brittle content, over the much more stout forged piston. Although forged pistons are heavier, it makes up for being stronger, able to withstand higher compression. This enables the engine to rev more and harder providing more power and efficiency. This is and the unique 4 valve design allows for better airflow and increased performance. A strong piston for upgraded big bore Grom or Monkey engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1x 4V 61mm Forged Piston\u003c\/li\u003e\n\u003cli\u003e2x Pin Clips\u003c\/li\u003e\n\u003cli\u003e1x Piston Pin\u003c\/li\u003e\n\u003cli\u003e1x Piston Ring Set\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KOSO","offers":[{"title":"Default Title","offer_id":49166140801308,"sku":"MD623010","price":75.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/koso-honda-grom-4v-piston-kit.jpg?v=1718885813"},{"product_id":"polaris-rzr-170-2v-cylinder-head-big-valve-30-5-26-5mm","title":"Taida Polaris RZR 170 2V Cylinder Head - Big Valve 30.5\/26.5mm","description":"\u003cp dir=\"auto\"\u003e\u003cstrong\u003eChoose your compression edge: Available in 18cc or 16.5cc combustion chamber variants for tailored power and reliability.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe Taida 2V Big Valve Cylinder Head is the premier airflow upgrade for Polaris RZR 170 racers and enthusiasts who demand maximum performance while remaining fully compliant in MOA and USAC classes. With oversized 30.5mm intake and 26.5mm exhaust valves, expert Taida porting, and two combustion chamber options (18cc standard or 16.5cc high-compression), this head lets you dial in the perfect setup—whether prioritizing peak horsepower, safer detonation margins, or class-specific compression rules.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eKey Features \u0026amp; Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eOversized Valves\u003c\/strong\u003e – 30.5mm intake \/ 26.5mm exhaust deliver massive flow improvements over stock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Taida Porting\u003c\/strong\u003e – Enlarged ports (30.5mm intake \/ 26.5mm exhaust) boost velocity, throttle response, and overall power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Combustion Chamber Options\u003c\/strong\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e18cc\u003c\/strong\u003e – Balanced choice for reliable performance, excellent heat management, and easier tuning on pump fuel or varied conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16.5cc\u003c\/strong\u003e – Higher compression for sharper throttle snap, more mid-range torque, and top-end pull—ideal for aggressive racing or when paired with premium fuel\/octane boosters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBolt-On Compatibility\u003c\/strong\u003e – 57mm head stud spacing fits stock RZR 170 engines (GY6-style B-block) and big-bore setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Assembled\u003c\/strong\u003e – Includes premium valves, springs, retainers, and seals ready for install.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMOA \/ USAC Legal\u003c\/strong\u003e – Proven compliant with current MAO and USAC RZR 170 class rules—no clearance or spec issues.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUpgraded Hardware\u003c\/strong\u003e – Comes with 6mm intake manifold studs\/nuts and 8mm exhaust studs for secure, leak-free mounting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eWhat’s Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eFully assembled 2V big valve cylinder head (30.5\/26.5mm valves)\u003c\/li\u003e\n\u003cli\u003eIntake and exhaust valves, springs, retainers, and seals installed\u003c\/li\u003e\n\u003cli\u003e6mm intake manifold studs \u0026amp; nuts\u003c\/li\u003e\n\u003cli\u003e8mm exhaust studs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003ePerfect For\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003ePolaris RZR 170 race and trail builds\u003c\/li\u003e\n\u003cli\u003eMOA-sanctioned events\u003c\/li\u003e\n\u003cli\u003eUSAC-sanctioned competitions\u003c\/li\u003e\n\u003cli\u003eHigh-performance dune, desert, or backyard upgrades\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Polaris","offers":[{"title":"18cc","offer_id":49166156726556,"sku":"RZR-TDCH-GY6B-BV1-01","price":249.95,"currency_code":"USD","in_stock":true},{"title":"16.5cc","offer_id":49166156759324,"sku":"RZR-TDCH-GY6B-BV1-02","price":249.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/polaris_rzr_170_2v_cylinder_head_-_big_valve.jpg?v=1718885914"},{"product_id":"polaris-rzr-170-2v-performance-cylinder-kit-63mm-forged-piston-drowspec","title":"Polaris RZR 170 2V Performance Cylinder Kit - 63mm Forged Piston DROWspec","description":"\u003cp\u003eThe DROWspec Polaris RZR 170 Performance Cylinder Kit is a +2mm big bore cylinder kit that bores the displacement from 170cc to 180cc. The RZR 170 Big Bore Kit includes a 63mm cylinder and a high compression forged piston. The DROWspec high compression forged piston was designed with our spec in mind of keeping the big bore kit reliable and provide good performance gain on the pump gas. Our kit is the highest power 180cc bolt on big bore kit for the Polaris RZR 170. This is not the same as a stock cast piston. The kit comes with two options for paper base gaskets to help fine tune requirements from end user. It comes with a thinner gasket for higher compression and a thicker gaster to help lower compression.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDROWspec Forged Piston\u003c\/li\u003e\n\u003cli\u003eHigh Tolerance Cylinder\u003c\/li\u003e\n\u003cli\u003e57mm Spacing\u003c\/li\u003e\n\u003cli\u003eHigh compression\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBore: 63mm\u003c\/li\u003e\n\u003cli\u003ePiston: 63mm Forged\u003c\/li\u003e\n\u003cli\u003eHead Stud Spacing: 57mm\u003c\/li\u003e\n\u003cli\u003eDisplacement: 180cc\u003c\/li\u003e\n\u003cli\u003e1 Thin Base Gasket (High Compression)\u003c\/li\u003e\n\u003cli\u003e1 Thick Base Gasket (Low Compression)\u003c\/li\u003e\n\u003cli\u003e1 Head Gasket\u003c\/li\u003e\n\u003cli\u003e1 Piston Pin\u003c\/li\u003e\n\u003cli\u003e2 Piston Pin Clip\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Polaris","offers":[{"title":"Default Title","offer_id":49166156923164,"sku":"RZR-TDCK-GY6B-63-022","price":269.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/polaris-rzr-170-2v-big-bore-cylinder-kit---63mm-_57mm-spacing_---forged-piston-drowspec.jpg?v=1718885918"},{"product_id":"oem-honda-grom-125-cylinder-base-gasket","title":"OEM Honda Grom 125 Cylinder Base Gasket (2014-2020)","description":"\u003cp\u003eOEM Honda Grom 125 Cylinder Base Gasket\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2014-2020 Honda Grom 125 \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2019+ Honda Monkey125\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honda OEM","offers":[{"title":"Default Title","offer_id":49166165606684,"sku":"12191-K73-T60","price":3.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/oem-2014-2020-grom-cylinder-base-gasket-12191-K73-T60.jpg?v=1755298635"},{"product_id":"oem-honda-grom-125-piston-rings-std","title":"OEM Honda Grom 125 Piston Rings-STD (2014-2020)","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eRebuilding your Grom's top end? Don't cheap out on the rings. This is the genuine Honda OEM standard-bore piston ring set (P\/N 13012-KYZ-900) for the 2014-2020 Grom 125 — the exact rings that came in your motor from the factory, engineered to match Honda's bore tolerances and cylinder finish right out of the box.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003eIf you're running a stock 52.4mm bore and freshening up a tired engine, these are what you want. Correct ring geometry means proper seal, proper compression, and no guesswork on end gap the way you get with some aftermarket sets. Slap 'em on a fresh piston, hone your cylinder, and you're back to factory-spec sealing.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eWhat you get:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eComplete OEM ring set for one (1) piston\u003ccode class=\"bg-text-200\/5 border border-0.5 border-border-300 text-danger-000 whitespace-pre-wrap rounded-[0.4rem] px-1 py-px text-[0.9rem]\"\u003e set includes top ring, second ring, and oil ring assembly\u003c\/code\u003e\n\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSTD (standard) size — for stock, un-bored cylinders only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul dir=\"ltr\" class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3 print:block print:space-y-1\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eHonda Grom 125 (GROM \/ MSX125) — 2014-2020 \u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eStandard bore: 52.4mm \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\" dir=\"ltr\"\u003e \u003c\/p\u003e","brand":"Honda OEM","offers":[{"title":"Default Title","offer_id":49166168064284,"sku":"13012-KYZ-900","price":13.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/oem-honda-grom-piston-rings-13012-KYZ-900.jpg?v=1755297556"},{"product_id":"oem-14-20-honda-grom-top-end-rebuild-kit-stock-bore","title":"OEM ('14-'20) Honda Grom Top End Rebuild Kit - Stock Bore","description":"\u003cp\u003eThe Top End Rebuild Kit for the 2014-2020 Honda Grom\/MSX125 is the ultimate package for OEM replacement parts. This kit includes a complete combination of parts that are required to replace and rebuild your top end without having to search up each part. These are all genuine OEM replacement parts that will ensure factory tolerances for optimum OEM performance. This is a do it yourself package that does not come with extra parts.\u003c\/p\u003e\u003cp\u003eEach part should be replaced when rebuilding top end due to leaking issues from reused crushed washers or gaskets. Use a clean workspace and properly lubricate moving parts before full installation. It is highly recommended that oil is changed so please purchase oil changing gaskets and oil to complete the rebuild unless you already have parts. The piston is standard OEM size and does NOT come with the piston rings or c-clip preinstalled. If you plan on rebuilding yourself, a \u003ca href=\"https:\/\/www.drowsports.com\/buzzetti-piston-ring-install-plier\/\"\u003episton pin clip tool\u003c\/a\u003e is highly recommended to provide an easier install.\u003c\/p\u003e\u003cp\u003e Whether your top end is ticking from riding too hard or you have been doing too many wheelies and the bike has oil starved, this is the best rebuild package. If you have any questions or concerns with the package please contact us before purchasing at info@drowsports.com.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e1x STD Piston\u003c\/li\u003e\n\u003cli\u003e1x Piston Pin\u003c\/li\u003e\n\u003cli\u003e1x STD Piston Rings\u003c\/li\u003e\n\u003cli\u003e2x C-Clip\u003c\/li\u003e\n\u003cli\u003e1x Cylinder\u003c\/li\u003e\n\u003cli\u003e1x Base Gasket\u003c\/li\u003e\n\u003cli\u003e1x Head Gasket\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honda OEM","offers":[{"title":"Default Title","offer_id":49166168129820,"sku":"HND-MSX-TERK","price":184.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/oem-honda-grom-topend-rebuild-kit_1_2.jpg?v=1718886021"},{"product_id":"pro-honda-hondabond-gasket-maker-ht","title":"Pro Honda Hondabond Gasket Maker HT","description":"\u003cp\u003eHondabond HT is a high-end motorcycle-specific silicone liquid gasket. This liquid gasket is a fantastic substitute for a paper gasket. It is a high-temperature unique formula that will not corrode aluminum. Honda has tested the performance and durability of this silicone with the top of the line professional racing. Be sure to get the quality\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003eThis item is considered hazardous material. Orders containing this product will ship ground only and cannot be shipped to Alaska, Hawaii, US Territories or outside the United States.\u003c\/span\u003e\u003c\/p\u003e","brand":"Honda OEM","offers":[{"title":"Default Title","offer_id":49166176715036,"sku":"08718-0004","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/hondabond_ht.png?v=1718886104"},{"product_id":"athena-top-end-gasket-kit-polaris-rzr-170","title":"Athena Top End Gasket Kit Polaris RZR 170","description":"Athena Gaskets are popularly used amongst on-road and off-road riders. They use quality gasket material to provide the best seal. The Top End Kit for the Polaris RZR 170 comes with all the necessary gaskets to replace the top end including a metal and paper gasket for the head and cylinder. Also gaskets for the intake and several seals. Athena makes it easy to get every gasket needed for your project. Remember to always replace your gaskets when rebuilding parts of your engine!","brand":"Athena","offers":[{"title":"Default Title","offer_id":49166179893532,"sku":"P400427600020","price":49.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/athena_rzr170_topendgasket_2.png?v=1718886134"},{"product_id":"koso-honda-grom-61mm-big-bore-cylinder-w-o-piston","title":"KOSO Honda Grom 61mm Big Bore Cylinder (w\/o piston)","description":"KOSO Honda Grom 61mm Big Bore Cylinder (w\/o piston)","brand":"KOSO","offers":[{"title":"Default Title","offer_id":49166377451804,"sku":"MB623004","price":218.0,"currency_code":"USD","in_stock":true}]},{"product_id":"koso-honda-grom-monkey-4-valve-cylinder-head-kit","title":"KOSO Honda Grom\/Monkey 4-Valve Cylinder Head Kit","description":"\u003cp\u003eKOSO Honda Grom\/Monkey 125 4 Valve Cylinder Head Kit with larger square intake and oversize exhaust port to accommodate the pair of 24mm intake and 21mm exhaust valves. The Koso Grom\/Monkey 4 Valve Cylinder Head Kit is designed to be added to an existing Koso Grom 61mm Big Bore Cylinder Kit.  This 4 Valve Head will only work with KOSO 61mm Grom\/Monkey Big Bore Kit.  \u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKoso Honda Grom 125 4V Cylinder Head Kit\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eKoso 4-valve Cylinder Head \u003c\/li\u003e\n\u003cli\u003eIntake Valve 24mm\u003c\/li\u003e\n\u003cli\u003eExhaust Valve 21mm\u003c\/li\u003e\n\u003cli\u003eRoller Rocker \u003c\/li\u003e\n\u003cli\u003eKoso Camshaft\u003c\/li\u003e\n\u003cli\u003eKoso 61mm Forged Piston for 4 Valve \u003c\/li\u003e\n\u003cli\u003eKoso Large Port Exhaust Gasket \u003c\/li\u003e\n\u003cli\u003eKoso Intake Manifold for large throttle body (34mm not included)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KOSO","offers":[{"title":"Default Title","offer_id":49166389772572,"sku":"MC623000","price":900.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/koso-honda-grom-4-valve-head.jpg?v=1718888265"},{"product_id":"koso-honda-grom-monkey-replacement-gasket-kit-61mm","title":"KOSO Honda Grom\/Monkey Replacement Gasket Kit 61mm","description":"Replacement Gaskets for Honda Grom\/Monkey 61mm Big Bore Kit\u003cp\u003e\u003cstrong\u003eKOSO Honda Grom\/Monkey Replacement Gasket Kit 61mm\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eKOSO Big Bore 61mm Cylinder Kit\u003c\/li\u003e\n\u003cli\u003e1 - Metal Head Gasket\u003c\/li\u003e\n\u003cli\u003e1 - Paper Base Gasket \u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003c\/p\u003e\u003cul style=\"display: inline !important;\"\u003e\u003cli style=\"display: inline !important;\"\u003e\u003c\/ul\u003e","brand":"KOSO","offers":[{"title":"Default Title","offer_id":49166454358300,"sku":"MA623100","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/koso-grom-125-big-bore-replace-gasket-61mm.jpg?v=1718888791"},{"product_id":"koso-honda-grom-monkey-replacement-forged-piston-61mm","title":"KOSO Honda Grom\/Monkey Replacement Forged Piston 61mm","description":"Forged KOSO Honda Grom\/Monkey Replacement 61mm 2 Valve Piston\u003cp\u003e\u003cstrong\u003eKOSO 61mm Forged Piston Honda Grom\/Monkey 125\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e61mm Forged Piston\u003c\/li\u003e\n\u003cli\u003ePiston Pin\u003c\/li\u003e\n\u003cli\u003ePiston Rings (4pcs)\u003c\/li\u003e\n\u003cli\u003ePiston C-Clip\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KOSO","offers":[{"title":"Default Title","offer_id":49166454522140,"sku":"MD623000","price":135.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/koso-honda-grom-61mm-forged-piston.jpg?v=1718888688"},{"product_id":"koso-honda-grom-170cc-performance-61mm-2v-cylinder-kit","title":"KOSO Honda Grom 170cc Performance 61mm 2V Cylinder Kit","description":"Koso Honda Grom Performance Cylinder Kit will upgrade your Grom from a 125cc to a 170cc.  Using a forged piston and ceramic coated cylinder this 170cc kit will ensure your Grom will run reliably as the factory on pump gas.\u003cp\u003e\u003cstrong\u003eKOSO 61mm Big Bore Cylinder Kit (170cc)\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDisplacement: 169.2cc\u003c\/li\u003e\n\u003cli\u003eCylinder Materical: Aluminum with Ceramic coated\u003c\/li\u003e\n\u003cli\u003ePiston: 61mm Forged\u003c\/li\u003e\n\u003cli\u003eCompression: 11.5 to 1\u003c\/li\u003e\n\u003cli\u003eCylinder with oil cooler fitting\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KOSO","offers":[{"title":"Default Title","offer_id":49166455046428,"sku":"MB623002","price":475.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/koso-honda-grom-125-big-bore-cylinder-kit.jpg?v=1718888716"},{"product_id":"taida-gy6-67mm-water-cooled-performance-cylinder-kit-forged-piston","title":"Taida GY6 67mm Water-cooled Performance Cylinder Kit - Forged Piston","description":"Taida GY6 67mm Water-cooled Cylinder kit is the top of the line no-compromise performance kit for the GY6 150cc engine.  Going water-cooled means better cooling which makes it more reliable.  The 67mm bore used with Taida +8.2mm Stroker Crankshaft will make a total displacement of 232cc.  Water-cool kit will require a radiator and water pump.   \u003cdiv\u003e\u003cstrong\u003eTaida 67mm Water-cooled Cylinder kit with Forged Piston\u003c\/strong\u003e\u003c\/div\u003e\u003cul\u003e\n\u003cli\u003eGY6 150cc 57mm Engine Only (157QMJ) \u003c\/li\u003e\n\u003cli\u003eRecommend Taida Engine Crankcase\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDeck 75.5mm for Taida 8200 crank (232cc)\u003c\/li\u003e\n\u003cli\u003eFits: 57mm Head Stud Spacing (\"B\" case)\u003c\/li\u003e\n\u003cli\u003e67mm Water-Cooled Cylinder\u003c\/li\u003e\n\u003cli\u003e67mm Forged Piston\u003c\/li\u003e\n\u003cli\u003e1 Thin Base Gasket (High Compression)\u003c\/li\u003e\n\u003cli\u003e1 Thick Base Gasket (Low Compression)\u003c\/li\u003e\n\u003cli\u003e1 Head Gasket\u003c\/li\u003e\n\u003cli\u003ePiston Pin\u003c\/li\u003e\n\u003cli\u003e2 Piston Pin Clip \u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOptional Parts:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eRadiator\u003c\/li\u003e\n\u003cli\u003eRadiator Hose\u003c\/li\u003e\n\u003cli\u003eWater Pump\u003c\/li\u003e\n\u003cli\u003eHose Clamp\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eCustom Radiator mounting, cooling plumping and fabication.  Addtional parts required.\u003c\/em\u003e\u003c\/p\u003e","brand":"Taida","offers":[{"title":"Taida Watercool Kit - Radiator, Hose, Water Pump, Hose Clamp","offer_id":49166459994396,"sku":"TDCK-GY6-67-021HW-01","price":579.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/taida-parts-232cc-gy6-big-bore-kit.jpg?v=1718888859"},{"product_id":"taida-gy6-replacement-piston-ring-set","title":"Taida GY6 Replacement Piston Ring Set","description":"\u003cp\u003eUse the Taida GY6 Big Bore Replacement Piston Ring Set to put together your engine with new parts to have it running reliably. Reusing old parts, or not replacing them when you have a chance creates a lot of risks, replacing your piston rings will definitely give you the peace of mind once everything has been put together. We have several sized sets available if you need any assistance picking the right one out or installing it, just give us a call!\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003ePiston Ring for Taida Big Bore Cylinder Kit:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e61mm (0.8x0.8x2.0)\u003c\/li\u003e\n\u003cli\u003e61mm (1.0x1.0x2.0)\u003c\/li\u003e\n\u003cli\u003e63mm (0.8x0.8x2.0)\u003c\/li\u003e\n\u003cli\u003e65mm (2.0x2.5)\u003c\/li\u003e\n\u003cli\u003e67mm (0.8x0.8x2.0)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Taida","offers":[{"title":"61mm(0.8x0.8x2.0)","offer_id":49166513602844,"sku":"TD-GY6-R61","price":28.0,"currency_code":"USD","in_stock":true},{"title":"61mm (1.0x1.0x2.0)","offer_id":54039759454492,"sku":null,"price":28.0,"currency_code":"USD","in_stock":true},{"title":"63mm(0.8x0.8x2.0)","offer_id":49166513635612,"sku":"TD-GY6-R63","price":28.0,"currency_code":"USD","in_stock":true},{"title":"65mm (0.8x0.8x1.5)","offer_id":54192013181212,"sku":null,"price":28.0,"currency_code":"USD","in_stock":true},{"title":"67mm(0.8x0.8x2.0)","offer_id":49166513668380,"sku":"TD-GY6-R67","price":28.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/taida_piston_rings.jpg?v=1718889212"},{"product_id":"taida-gy6-150-cylinder-head-replacement-hardware-kit","title":"Taida GY6 150 Cylinder Head Replacement Hardware Kit","description":"Taida GY6 150cc replacement cylinder head hardware kit\u003cbr\u003e\u003cul\u003e\n\u003cli\u003e(2) M6 Stud - Intake Manifold\u003c\/li\u003e\n\u003cli\u003e(2) M8 Stud - Exhaust\u003c\/li\u003e\n\u003cli\u003e(2) M8 Nut -  Exhaust\u003c\/li\u003e\n\u003cli\u003e(1) Exhaust Gasket\u003c\/li\u003e\n\u003cli\u003e(1) Intake Manifold Gasket\u003c\/li\u003e\n\u003cli\u003e(1) Intake Manifold Plastic Spacer \u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Taida","offers":[{"title":"Default Title","offer_id":49166518386972,"sku":"TD-GY6-R01","price":17.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/dro_1825a1024l.jpg?v=1718889331"},{"product_id":"taida-gy6-replacement-cylinder-gaskets-set-57mm-spacing","title":"Taida GY6 Replacement Cylinder Gaskets Set (57mm Spacing)","description":"Taida replacement gasket set for B-Case GY6 with 57mm head stud spacing and Polaris RZR 170.  No matter the situation, you'll want to replace these as needed rather than take extra risks.  Available in a variety of sizes.\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 150cc with 57mm Head Studs\u003c\/li\u003e\n\u003cli\u003ePolaris RZR 170\u003c\/li\u003e\n\u003cli\u003eTaida GY6 Big Bore Cylinder Kit (B Case \/ 57mm Head Studs Spacing)\u003c\/li\u003e\n\u003cli\u003eHead Gasket\u003c\/li\u003e\n\u003cli\u003eBase Gasket: Thin: 0.5mm, Thick: 0.8mm\u003c\/li\u003e\n\u003cli\u003eTiming Chain Tensioner Gasket\u003c\/li\u003e\n\u003cli\u003ePiston Wrist Pin Clip = 2\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Taida","offers":[{"title":"61mm","offer_id":49166546141468,"sku":"TD-GY6B-G61","price":18.95,"currency_code":"USD","in_stock":true},{"title":"63mm","offer_id":49166546174236,"sku":"TD-GY6B-G63","price":18.95,"currency_code":"USD","in_stock":true},{"title":"65mm","offer_id":49166546207004,"sku":"TD-GY6B-G65","price":18.95,"currency_code":"USD","in_stock":true},{"title":"67mm","offer_id":49166546239772,"sku":"TD-GY6B-G67","price":18.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/td-gy6b-g6x-00.jpg?v=1718889366"},{"product_id":"gy6-180cc-63mm-2v-cylinder-piston-kit-b-case","title":"GY6 180cc 63mm 2v Cylinder \u0026 Piston Kit B-Case","description":"\u003cp\u003eGY6 180cc 63mm Performance Replacement Cylinder Kit for Power 180cc Big Bore Kits. This is a replacement cylinder and piston option for the Power 180 Big Bores. This replacement cylinder kit includes a brand new cylinder and 63mm cast piston with wrist pin clips and gasket. If you've damaged or seized your engine this is all you need to rebuild rather than buy a whole new kit! This is a B-Case 180cc Cylinder Kit and will work with most B-Case GY6 engines. This also works with the Polaris RZR 170 as well. It will eliminate the EGR once used with a Power 180cc cylinder head and valve cover.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e63mm Cast Piston\u003c\/li\u003e\n\u003cli\u003e63mm Cylinder\u003c\/li\u003e\n\u003cli\u003eWrist Pin\u003c\/li\u003e\n\u003cli\u003eC-Clips\u003c\/li\u003e\n\u003cli\u003eCylinder Base Gasket\u003c\/li\u003e\n\u003cli\u003eCylinder Head Gasket\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GY6 Parts","offers":[{"title":"Default Title","offer_id":49166624227612,"sku":"169-172","price":140.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/sspg-power180-63mm-b-case-cylinder-kit.jpg?v=1718889899"},{"product_id":"taida-gy6-65mm-performance-cylinder-kit","title":"Taida GY6 65mm Performance Cylinder Kit","description":"Taida GY6 Performance 65mm cylinder kit. Using the stock GY6 crankshaft increases to 192cc cylinder displacement.   In combination with the Taida GY6 3500, Stroker Crankshaft will produce a 204cc cylinder displacement.\u003cp\u003e\u003cstrong\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 125cc\u003c\/li\u003e\n\u003cli\u003eGY6 150cc\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBore : 65mm\u003c\/li\u003e\n\u003cli\u003eFits: 57mm Head Stud Spacing\u003c\/li\u003e\n\u003cli\u003eDisplacement: 192cc (stock crank)\u003c\/li\u003e\n\u003cli\u003e1 Thin Base Gasket (High Compression)\u003c\/li\u003e\n\u003cli\u003e1 Thick Base Gasket (Low Compression)\u003c\/li\u003e\n\u003cli\u003e1 Head Gasket\u003c\/li\u003e\n\u003cli\u003ePiston Pin\u003c\/li\u003e\n\u003cli\u003e2 Piston Pin Clip\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Taida","offers":[{"title":"Default Title","offer_id":49166658896156,"sku":"TDCK-GY6-65","price":124.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/tdck-gy6-65-00.jpg?v=1718890110"},{"product_id":"taida-gy6-61mm-performance-cylinder-kit-with-forged-piston-54mm-spacing","title":"Taida GY6 61mm Performance Cylinder Kit with Forged Piston - (54mm spacing)","description":"\u003cp\u003eWorking closely with Taida, we were able to produce a bolt-on GY6 150 Performance cylinder kit. This Taida 61mm Performance Cylinder kit with forged piston will increase your displacement to 170cc with a stock crankshaft. We recommend using this with a Taida Big Port Cylinder Head to get the most out of it.\u003c\/p\u003e\n\u003cp\u003eWith cylinder, kits are generally two-piston options, the stock cast piston, and the upgraded forged piston. In terms of function and performance, you can expect approximately the same results. However, when it comes to strength, reliability, and safety, you may want to upgrade to the forged piston. With a cast piston, the melted alloy is poured into a mold then finely cleaned and machined until suitable for use. Whereas forged pistons start with a solid cylindrical block of aluminum alloy then stamped and further machined. One of the main points to get out of this is that cast pistons require additional silicon added to increase the hardness and strength of the piston, while a forged piston starts off as a hardened material and is shaped to specifications. For high-performance applications and high RPMs, cast pistons can be too brittle and lead to failure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eGY6 150cc 61mm Big Bore Cylinder Kit (A-Case)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"font-family: Arial, Helvetica, sans-serif; text-align: justify;\"\u003e\n\u003cli\u003eGY6 125cc and 150cc\u003c\/li\u003e\n\u003cli\u003e54mm Head Stud Spacing \/ A-Case\u003c\/li\u003e\n\u003cli\u003e100% Bolt On Kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-family: Arial,Helvetica,sans-serif;\"\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"font-family: Arial, Helvetica, sans-serif; text-align: justify;\"\u003e\n\u003cli\u003e61mm High Compression Forged Piston (DROWspec)\u003c\/li\u003e\n\u003cli\u003e54mm Head Stud Spacing\u003c\/li\u003e\n\u003cli\u003eDisplacement: 170cc (stock crank)\u003c\/li\u003e\n\u003cli\u003e1 Thin Base Gasket (High Compression)\u003c\/li\u003e\n\u003cli\u003e1 Thick Base Gasket (Low Compression)\u003c\/li\u003e\n\u003cli\u003e1 Head Gasket\u003c\/li\u003e\n\u003cli\u003ePiston Pin\u003c\/li\u003e\n\u003cli\u003e2 Piston Pin Clip\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Taida","offers":[{"title":"Default Title","offer_id":49166660403484,"sku":"TDCK-GY6A-61-024","price":204.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/tdck-gy6a-61-021-00.jpg?v=1718890124"},{"product_id":"taida-gy6-61mm-performance-cylinder-package-with-forged-piston","title":"Taida GY6 61mm Performance Cylinder Package with Forged Piston","description":"\u003cp\u003eDROWsports Spec 170cc GY6 Performance Kit is a high-performance big bore package designed for increased power. This kit comes with a Taida Camshaft, a large port cylinder head, and a 61mm big bore cylinder and piston. The Taida 2V Cylinder is a large port head 28mm and 23mm for better breathing. The larger head provides a significant amount of performance gain due to the amount of air and fuel allowed in. The Taida cylinder used is higher end cylinder designed to withstand high heat and last longer. These cylinders are paired with our own Spec'd Forged Piston. We've gone the Forged Piston with a high compression route due to the reliability, strength, and overall quality compared to cast pistons. The Forged piston will allow for higher compression, increase the power of the engine. Running a Forged Piston with high compression provides the best route for more horsepower. This paired with an aftermarket camshaft will optimize the performance output that the cylinder and head provide. The entire kit is designed to fit A-Case GY6 engines (54mm), please contact us if you have any questions. Don't be fooled by other kits, this kit rivals almost every other 170cc Big Bore package out there.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 150 61mm Performance Cylinder\u003c\/li\u003e\n\u003cli\u003eGY6 150 Large Ported Cylinder Head 28mm\/23mm\u003c\/li\u003e\n\u003cli\u003eDROWsports Spec'd High Compression Forged Piston\u003c\/li\u003e\n\u003cli\u003eGY6 150 Performance Camshaft\u003c\/li\u003e\n\u003cli\u003eHigher and Lower Compression Gaskets\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eApplications:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGY6 125 152QMI\u003c\/li\u003e\n\u003cli\u003eGY6 150 157QMJ\u003c\/li\u003e\n\u003cli\u003e54mm Head Stud Spacing (A-Case)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Taida","offers":[{"title":"Default Title","offer_id":49166661288220,"sku":"Taida GY6 170","price":464.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/dro_5777a1024l.jpg?v=1718890260"},{"product_id":"drowsports-polaris-rzr-170-performance-kit-power-package-180cc","title":"DROWsports Polaris RZR 170 Performance Kit Power Package 180cc","description":"\u003cp\u003eDROWsports Polaris RZR 170 Big Bore Kit Power Package 180cc is the ultimate 180cc package. It includes all the components to give your Polaris RZR 170 a major kick. This includes a 2V Big Bore Cylinder Kit with our specially made Forged Piston (DROWspec), a mid-range power camshaft, and a 2V Cylinder Head with larger valves.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e The fully upgrading kit does require a fuel controller or upgrading the ECU. We recommend getting the \u003cstrong\u003e\u003ca href=\"https:\/\/www.drowsports.com\/aracer-rcmini-5-polaris-rzr-170\/\"\u003eaRacer RC Super X\u003c\/a\u003e ECU\u003c\/strong\u003e to make sure your RZR 170 is running at a safe Air\/Fuel Mixture.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong style=\"font-size: 0.875rem;\"\u003eThe Polaris RZR 170 2V Big Bore Cylinder Kit\u003c\/strong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003e is an upgraded engine performance part designed to increase power, reliability, and durability. The kit includes a fully machined 63mm cylinder that fits a 57mm spacing with good tolerances to ensure proper compression. The piston is a 63mm forged piston with our own design and specification. These pistons are fitted with 63mm piston rings and a wrist pin held together by clips. There are two options for base gaskets, a thinner gasket designed for higher compression and a thicker gasket designed for lower compression and also a head gasket.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eOur DROWspec pistons are designed with a specific shape and clearance to provide the ultimate performance gain. This is not the same as a Stock Forged Piston. The entire kit has been created for great reliability, power, and torque by using the best quality materials and the best tolerances. To get the best power, get the best parts quality parts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDROWspec Forged Piston\u003c\/li\u003e\n\u003cli\u003eHigh Tolerance Cylinder\u003c\/li\u003e\n\u003cli\u003e57mm Spacing\u003c\/li\u003e\n\u003cli\u003eHigh compression\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBore: 63mm\u003c\/li\u003e\n\u003cli\u003ePiston: 63mm Forged\u003c\/li\u003e\n\u003cli\u003eHead Stud Spacing: 57mm\u003c\/li\u003e\n\u003cli\u003eDisplacement: 180cc\u003c\/li\u003e\n\u003cli\u003e1 Thin Base Gasket (High Compression)\u003c\/li\u003e\n\u003cli\u003e1 Thick Base Gasket (Low Compression)\u003c\/li\u003e\n\u003cli\u003e1 Head Gasket\u003c\/li\u003e\n\u003cli\u003e1 Piston Pin\u003c\/li\u003e\n\u003cli\u003e2 Piston Pin Clip\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eDROWsports 2V Cylinder Head\u003c\/strong\u003e for the Polaris RZR 170 is a fully upgraded top end replacement. This is a Big Valve head designed to fit 57mm spacing cylinders like the Polaris RZR 170 engine. This high-quality built Cylinder Head is designed with larger 2 valves, 30.5 intake \/ 26.5 exhaust. The oversized valves working with a high-end cam will create better overall power. The ports are properly machined to achieve high tolerance. It includes the valves, gaskets, manifold\/exhaust studs, and nuts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2 Valves: 30.5 intake \/ 26.5 exhaust\u003c\/li\u003e\n\u003cli\u003ePorting by Taida: 27.5mm intake \/ 26.5mm exhaust\u003c\/li\u003e\n\u003cli\u003e6mm Manifold Studs w\/Nuts\u003c\/li\u003e\n\u003cli\u003e8mm Exhaust Studs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eRacing Camshaft T300\u003c\/strong\u003e for the Polaris RZR 170 is designed for performance racing heads. The T300 camshaft is one of the best upgrades for anyone who plans on making more power and better performance. The lobes improve the low and mid-range rpm, this increases the takeoff and the climb up to top speed. This cam is perfect for the Polaris RZR 170, it has that low-end power to help rip through the dirt and the mid-range power to keep it ripping. This paired up with a full top end rebuild is one of the best combinations to get the power and speed you need.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIntake lift: 19.4 - Lobe Greatest: 25.7mm\u003c\/li\u003e\n\u003cli\u003eExhaust lift: 19.2 - Lobe Greatest: 25.45mm\u003c\/li\u003e\n\u003cli\u003eSprocket Teeth: 34\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Taida","offers":[{"title":"Default Title","offer_id":49166694842652,"sku":"RZR-170-2001","price":695.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/polaris-rzr-170-2v-big-bore-cylinder-kit_1.jpg?v=1718890521"},{"product_id":"koso-honda-grom-monkey-170cc-4-valve-performance-cylinder-kit-w-forged-piston-2014-2020","title":"KOSO Honda Grom\/Monkey 170cc 4 Valve Performance Cylinder Kit w\/ Forged Piston (2014-2020)","description":"\u003cp\u003eKoso 2014-2020 Honda Grom 4 valve head and 61mm performance cylinder kit with a forged piston. This is a completely newly designed head using a pair of 24mm intake\/21mm valves exhaust valves with matching large intake and exhaust port. This Koso 4 Valve can produce up to 23-26hp vs. stock 8-9hp. This is a performance engine part, there are no returns on performance parts or individual pieces.\u003c\/p\u003e\n\u003cp\u003eNeed a replacement piston, see our \u003ca href=\"https:\/\/www.drowsports.com\/koso-honda-grom-61mm-4v-piston-kit\/\"\u003eKOSO 4V Replacement Piston Kit.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKoso Honda Grom 4-Valve Package Includes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKoso 4V Cylinder Head\u003c\/li\u003e\n\u003cli\u003eKoso 4V Camshaft\u003c\/li\u003e\n\u003cli\u003eKoso 4V Intake Manifold\u003c\/li\u003e\n\u003cli\u003eKoso 61mm Ceramic Coated Cylinder\u003c\/li\u003e\n\u003cli\u003eKoso 61mm 4V Forged Piston  w\/ Piston Rings\u003c\/li\u003e\n\u003cli\u003eKoso Gaskets\u003c\/li\u003e\n\u003cli\u003eKoso 4V Tappet Cover\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpec:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCompression Ratio: 12.3:1\u003c\/li\u003e\n\u003cli\u003eCylinder Displacement: 169.2cc\u003c\/li\u003e\n\u003cli\u003ePower: +25hp\u003c\/li\u003e\n\u003cli\u003eRPM Redline: 12,500RPM\u003c\/li\u003e\n\u003cli\u003eRecommend: 92-93 Octane\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSupporting Parts:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKoso 34mm Throttle Body(Required)\u003c\/li\u003e\n\u003cli\u003eUpgrade Fuel Injector (Required)\u003c\/li\u003e\n\u003cli\u003eaRacer RC Super X or Mini-X Fuel Controller (Required)\u003c\/li\u003e\n\u003cli\u003eSpark PlugNGK ER9EH (Required)\u003c\/li\u003e\n\u003cli\u003eKoso High Flow Oil Pump (Recommended)\u003c\/li\u003e\n\u003cli\u003eKoso Cam Chain Tensioner (Recommended)\u003c\/li\u003e\n\u003cli\u003eKitaco Crankshaft (Recommend)\u003c\/li\u003e\n\u003cli\u003eJuggernaut Oil Cooler Kit (Recommend)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"KOSO","offers":[{"title":"Default Title","offer_id":49166697759004,"sku":"MB623003","price":1250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/koso-honda-grom-4-valve-head_2__1.jpg?v=1718890563"},{"product_id":"tb-parts-2v-big-valve-kit-24mm-21-5mm-honda-grom-monkey","title":"TB Parts 2v Big Valve Kit 24mm\/21.5mm - Honda Grom\/Monkey","description":"\u003cp\u003eTB Parts Big Valve Kit for the Honda Grom and Honda Monkey Cylinder Heads is a replacement kit for precut for big valves. These valves yield an additional +1.5mm intake and +0.5mm exhaust. Each valve is made with EV8 stainless steel, making this much lighter and more reliable with more strength. These characteristics including the larger valve size provide more flow allowing for better performance. Since the valves are much lighter, it helps to prevent valve from floating when revving higher. This opens up the bike to a better range of RPM.\u003c\/p\u003e\u003cp\u003ePlease keep in mind this does not fit the OEM stock head and will require it to be sent out to get machined properly. This upgrade will also require a fuel management system to regulate the flow into the head and out. Stock pistons will not work, a big valve piston designed to accept larger valves must be used with this kit. The kit includes valve springs, valves, pins, seals and seats.\u003c\/p\u003e","brand":"TBparts","offers":[{"title":"Default Title","offer_id":49166705262876,"sku":"TBW1042","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/tbparts-grom-monkey-big-valves.jpg?v=1718890672"},{"product_id":"codo-racing-155cc-big-bore-kit-zuma-125","title":"CODO Racing 155cc Big Bore Kit - Zuma 125","description":"\u003cp\u003eCODO Racing develops high-performance drag\/race scooters. They manufacture precision machined and quality built components like cylinders, pistons, cylinder heads and more. Their smaller cubic centimeter parts are no exception to their quality and performance. The 155cc Big Bore for the Zuma 125 is a direct fit with the OEM Zuma 125 Cylinder Head. This kit includes a new 58.5mm cylinder and forged piston. The cylinder comes with a treated exterior for better heat dissipation and durability against the elements. Their 58.5mm piston is a CNC Machined, forged, high compression piston. The piston includes the wrist pin, piston rings, and wrist pin clips. This fits the stock OEM head and valve sizes. Replacement roller rocker arms that are more durable are included. It also includes a replacement camshaft to utilize the new amount of power the cylinder is pushing out. To accommodate the new piston and cylinder, a 140cc flow rated injector is included.\u003c\/p\u003e\u003cp\u003eThis kit will increase your vehicle's performance to approximately 13.5 horsepower! Horsepower depends on the overall build quality and treatment and machining done to the cylinder head, piston, and other components.\u003c\/p\u003e","brand":"Codo Racing","offers":[{"title":"Default Title","offer_id":49166717845788,"sku":"CODO-BWS3-KIT","price":400.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/codo-racing-zuma-125-155cc-big-bore.jpg?v=1718890822"},{"product_id":"tb-parts-186cc-2v-64mm-big-bore-cylinder-kit-honda-grom-monkey","title":"TB Parts 186cc 2v 64mm Big Bore Cylinder Kit- Honda Grom \u0026 Monkey","description":"\u003cp\u003eThe TBparts 186cc 2v Big Bore Kit for the Honda Grom \u0026amp; Monkey is an upgraded replacement kit that increases the bore size to 64mm! This bolt-on cylinder kit does not require machining to the cases. The cylinder is an all-aluminum ceramic coated cylinder. This makes it lighter and reduced friction while providing better cooling. It also includes a block off plate for an oil coiler port. This allows you to easily install an oil cooler to the cylinder if needed. This is one of the biggest cylinder kits available to help increase power. The pistons are an extremely light weight cast build that has been precision machined. The kit includes a ceramic coated cylinder, 64mm 2v lightweight piston, rings, wrist pin, c-clips, head gasket, and base gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePerformance Increase\u003c\/li\u003e\n\u003cli\u003eFull Aluminum Cylinder\u003c\/li\u003e\n\u003cli\u003eLess Friction\u003c\/li\u003e\n\u003cli\u003eCeramic Coated\u003c\/li\u003e\n\u003cli\u003eOil Cooler Ports\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAluminum Ceramic-Coated Cylinder\u003c\/li\u003e\n\u003cli\u003e64mm 2v Lightweight Piston\u003c\/li\u003e\n\u003cli\u003ePiston Rings\u003c\/li\u003e\n\u003cli\u003eWrist Pin\u003c\/li\u003e\n\u003cli\u003eC-Clips\u003c\/li\u003e\n\u003cli\u003eHead Gasket\u003c\/li\u003e\n\u003cli\u003eBase Gasket\u003c\/li\u003e\n\u003cli\u003eOil Cooler Block Off\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TBparts","offers":[{"title":"Default Title","offer_id":49166719320348,"sku":"TBW9150","price":274.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/tbparts-grom-64mm-cylinder-kit.jpg?v=1718890734"},{"product_id":"tb-parts-performance-complete-big-bore-kit-143cc-kawasaki-z-125-pro","title":"TB Parts Performance Complete Big Bore Kit 143cc Kawasaki Z-125 Pro","description":"\u003cp\u003eKawasaki Z-125 Pro 143cc Complete Big Bore Kit by TBparts is a full top end replacement kit. The cylinder head is their V2 high-end race head. It uses their V2 race cam along with stainless steel 30mm intake and 24.5mm exhaust valves. The larger valves provide better airflow for performance power and torque. The roller rocker arms are made from forged aluminum and have been anodized red for a nice finish. The cylinder head will bolt up and work with the Z-125 Pro exhausts and the oil lines going to the head. The is made from a full aluminum cylinder using a full aluminum sleeve for better heat transfer and dissipation. The cylinder kit is 60mm bringing the Z-125 Pro to a 143cc bigger bore. It uses an all-new machined higher compression piston. The piston comes with rings, wrist pin, and clips. The kit also includes a fully port matched intake manifold along with a sensor extension. This kit will increase your vehicle's horsepower and performance! Don't get left in the dust or risk reliability with extremely high compression builds. This simple big bore will net you ~12 horsepower!\u003cbr\u003ePlease keep in mind you will need an aftermarket fuel controller in order to regulate air to fuel ratio. It is recommended to use the aRacer RC Mini 5 including their AF1 Wideband.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePort matched intake manifold\u003c\/li\u003e\n\u003cli\u003eV2 Performance Race Cam\u003c\/li\u003e\n\u003cli\u003eHigh Compression Piston\u003c\/li\u003e\n\u003cli\u003eAluminum Ceramic-Coated Cylinder\u003c\/li\u003e\n\u003cli\u003e30mm Intake \u0026amp; 24.5mm Exhaust Valves\u003c\/li\u003e\n\u003cli\u003eBetter Cylinder Head Flow\u003c\/li\u003e\n\u003cli\u003eMore Horsepower \u0026amp; Torque\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCylinder Head (complete with cam \u0026amp; valves)\u003c\/li\u003e\n\u003cli\u003eCylinder\u003c\/li\u003e\n\u003cli\u003ePiston (complete with wrist pin, rings \u0026amp; clips)\u003c\/li\u003e\n\u003cli\u003eIntake Manifold\u003c\/li\u003e\n\u003cli\u003eHead \u0026amp; Base Gasket\u003c\/li\u003e\n\u003cli\u003eExhaust Gasket\u003c\/li\u003e\n\u003cli\u003eSensor Extension\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TBparts","offers":[{"title":"Default Title","offer_id":49166731936028,"sku":"TBW9175","price":679.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/tbparts-z125-143cc-bbk-cylinder-head.jpg?v=1718890881"},{"product_id":"tb-parts-64mm-top-end-gasket-kit-honda-grom-monkey","title":"TB Parts 64mm Top End Gasket Kit - Honda Grom\/Monkey","description":"The 64mm top-end gasket kit for the Honda Monkey and Grom by TB Parts comes complete with a base gasket and head gasket. These gaskets are designed to provide ultimate sealing and crush capabilities. This top-end gasket kit will fit most 180cc big bores. Mating the cylinder head and the cylinder to the case without leaking! This is a must-have in your arsenal when rebuilding a big bore.","brand":"TBparts","offers":[{"title":"Default Title","offer_id":49166737932572,"sku":"TBW1027","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/tbparts-64mm-gasket-kit.jpg?v=1718890908"},{"product_id":"drowsports-ls181-replacement-head-base-gasket-63mm","title":"DROWsports LS181 Replacement Head\/Base Gasket - 63mm","description":"DROWsports Top End Gasket Kit for the Honda Grom\/Monkey fits our 63mm LS 181cc Big Bore Kit. This kit includes both a paper gasket and a metal gasket. The paper gasket is precisely measured to provide the best clearance and compression ratio. This will be the perfect setup for the LS 181 for the right performance reliability. Our metal gaskets are made from very thin high-end steel. The steel is designed with specific embossed portions to provide the best seal. This has to seal oil and compression for the Grom or Monkey simultaneously. These two parts are both specifically designed to keep your cylinder and cylinder head from popping or leaking. Use the correct gaskets for your rebuild to offer the best performance and engine longevity.","brand":"DROWsports","offers":[{"title":"Default Title","offer_id":49166751826204,"sku":"MSX-2003","price":24.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/drowsports-ls181-top-end-gasket-kit.jpg?v=1718890891"},{"product_id":"drowsports-ls181-honda-grom-monkey-replacement-piston-rings-63mm","title":"DROWsports LS181 Honda Grom\/Monkey Replacement Piston Rings - 63mm","description":"\u003cp\u003eThe DROWsports Replacement Piston Ring set is designed to fit and replace the rings for DROWsports LS 181cc 63mm Big Bore Kit. This is a set of rings and includes a top compression ring, a second compression ring, two oil scrapper rings, and the center oil ring. These rings fit perfectly for the 63mm piston. The ring thickness is precisely made to provide the best seal for the combustion chamber. This helps prevent leaking, along with gapping the rings properly. The rings will still need to be gapped for perfect fitment. If you would like the rings to be gapped by use please request in the comments when purchasing or contact us via our contact form.\u003c\/p\u003e\u003cp\u003eRing Size - 63x0.8x0.8x1.5mm\u003c\/p\u003e","brand":"DROWsports","offers":[{"title":"Default Title","offer_id":49166751957276,"sku":"MSX-2005","price":30.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/drowsports-ls181-piston-rings.jpg?v=1718890894"},{"product_id":"taida-polaris-rzr-170-67mm-performance-cylinder-kit-with-forged-piston","title":"Taida Polaris RZR 170 67mm Performance Cylinder Kit with Forged Piston","description":"\u003cp\u003e\u003cem\u003ePicture may not reflect the actual product.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003eIf you are looking to increase power on your Polaris RZR 170, this is the way to go. The Taida 67mm Performance Cylinder Kit is a complete package that includes the cylinder and piston, gaskets, piston rings, and wrist pin. The cylinder is a 57mm head stud spacing and comes ceramic coated to help dissipate heat and alleviate the top end. We all know heat is the number one enemy! Running a ceramic cylinder is much cooler than normal aluminum cylinders. This is an air-cooled cylinder so the best option for reduction is always the way to go. The cylinder also includes two different gaskets, a thin gasket (high compression) and a thick gasket (low compression). The cylinder is accompanied by a forged piston. Our specially designed forged piston is manufactured specifically for our kit. Each piston is machined down to reduce weight and keep its structural integrity. This is one of our line of DROWspec pistons and cylinder kits. This kit is designed to work either an OEM Stroke Crankshaft (69.3 cylinder height) or a 66mm crankshaft (75.5mm cylinder height). This increases the engine capacity to 204cc or 232cc.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePolaris RZR 170\u003c\/li\u003e\n\u003cli\u003e69.3mm Low Deck Height (Factory 57.9mm Stroke)\u003c\/li\u003e\n\u003cli\u003e75.5mm Tall Deck Height (66mm Stroker Crank)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAir-cooled\u003c\/li\u003e\n\u003cli\u003eCeramic Cylinder (Better cooling capabilities)\u003c\/li\u003e\n\u003cli\u003eHigh and Low compression gaskets\u003c\/li\u003e\n\u003cli\u003eForged Piston\u003c\/li\u003e\n\u003cli\u003e57mm Stud Spacing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNOTE: Compression Ratio can vary depending, gasket, stroke, combustion chamber \u003c\/em\u003e\u003cem\u003evolume.\u003c\/em\u003e\u003c\/p\u003e","brand":"Taida","offers":[{"title":"69.3mm \/ V1 (Low)","offer_id":49166754316572,"sku":"TDCK-GY6-67-021L-HC","price":339.0,"currency_code":"USD","in_stock":true},{"title":"69.3mm \/ V2 (Med)","offer_id":54576921510172,"sku":null,"price":339.0,"currency_code":"USD","in_stock":false},{"title":"69.3mm \/ V3 (High)","offer_id":54576921542940,"sku":null,"price":339.0,"currency_code":"USD","in_stock":false},{"title":"75.5mm \/ V1 (Low)","offer_id":49166754349340,"sku":"TDCK-GY6-67-021H-HC","price":379.0,"currency_code":"USD","in_stock":true},{"title":"75.5mm \/ V2 (Med)","offer_id":54576921575708,"sku":null,"price":339.0,"currency_code":"USD","in_stock":false},{"title":"75.5mm \/ V3 (High)","offer_id":54576921608476,"sku":null,"price":339.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/taida-polaris-rzr170-67mm-air-cool-bbk.jpg?v=1718890901"},{"product_id":"oem-honda-grom-125-cylinder-1","title":"OEM Honda Grom 125 Cylinder (2014-2020)","description":"\u003cp\u003eOEM Replacement Honda Grom 125 Cylinder for 2014-2020.\u003c\/p\u003e\n\u003cp\u003ePart# 12100-K26-900\u003c\/p\u003e","brand":"Honda OEM","offers":[{"title":"Default Title","offer_id":49166757232924,"sku":"12100-K26-900","price":109.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/drowsports-grom-replacement-cylinder.jpg?v=1739316913"},{"product_id":"oem-honda-monkey-125-cylinder","title":"OEM Honda Monkey 125 Cylinder 2019-2020","description":"\u003cp data-start=\"109\" data-end=\"184\"\u003e\u003cstrong data-start=\"109\" data-end=\"182\"\u003eOEM Honda Monkey 125 Replacement Cylinder (2019–2020)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"186\" data-end=\"573\"\u003eKeep your Honda Monkey 125 running at peak performance with this genuine OEM Honda replacement cylinder. Built to factory specifications, this cylinder is the perfect solution for restoring your engine’s reliability and performance. Whether you’re rebuilding after wear and tear or repairing engine damage, this OEM part guarantees the same fit, finish, and durability as the original.\u003c\/p\u003e\n\u003cul data-start=\"575\" data-end=\"774\"\u003e\n\u003cli data-start=\"575\" data-end=\"613\"\u003e\n\u003cp data-start=\"577\" data-end=\"613\"\u003eOEM Part Number: 12100-K0F-T00\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"614\" data-end=\"654\"\u003e\n\u003cp data-start=\"616\" data-end=\"654\"\u003eFits: 2019–2020 Honda Monkey 125\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"655\" data-end=\"704\"\u003e\n\u003cp data-start=\"657\" data-end=\"704\"\u003eDirect replacement for the stock cylinder\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"705\" data-end=\"774\"\u003e\n\u003cp data-start=\"707\" data-end=\"774\"\u003eGenuine Honda Part for lasting performance and reliability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Honda OEM","offers":[{"title":"Default Title","offer_id":49166757429532,"sku":"12100-K0F-T00","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/honda-monkey-125-cylinder-12100-K0F-T00.jpg?v=1759537598"},{"product_id":"drowsports-honda-grom-monkey-ls-125cc-2v-high-compression-forged-piston-kit","title":"DROWsports Honda Grom\/Monkey LS 125cc 2v High Compression Forged Piston Kit","description":"\u003cp\u003eIf you are looking for more power for your Grom or Monkey and don't want to spend copious amounts of funds, look no further! Our specially designed pistons were made to increase power and performance without major hassle! The piston utilizes the same OEM cylinder but we've increased the compression. Rather than using the cast piston which is rather weak and brittle, the DROWsports LS 125cc Piston is forged. A forged piston provides a much stronger molecular shape meaning it can withstand more abuse. This also means we can easily CNC machine the piston for a precise dome size. The backside of the piston is also machined and shaped for structural integrity and weight reduction. Holes are machined into the piston for better lubrication.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDROWsports LS 125 Forged Piston comes complete ready to throw into your vehicle, this only requires an adjustable ECU to set the AFR. We do offer replacement cylinders in case you're cylinder is damaged or you would like to start fresh.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePiston Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eForged Piston\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe 2 valve piston comes forged, which is one of the best options for performance and reliability. Forged pistons compared to cast pistons are much stronger and more reliable due to their manufacturing process. The forging process gives it stronger structural integrity over cast pistons. Forged has a smooth and consistent grain structure due to the heat and pressing process.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eCNC Machined\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eOnce these are finished being forged, they are precision CNC machined. Machining it versus pouring metal into a cast allows the piston to have higher tolerances. This is a more expensive process but provides the highest performance option available. For this reason alone, it allows the best seal with the piston rings inside the cylinder. With this option, we are capable of getting the right size valve reliefs to accept bigger valves. Perfect for an upgraded head!\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eStrutted Piston Skirt\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe piston skirt utilizes a strutted design over a full round design. Having a strutted design not only reduces the weight but provides key points that can be machined to increase overall piston strength where the rods connect. This characteristic shaves off undesired weight and can be designed to help keep piston structure sturdy. This also helps with less friction due to reduced amounts of material against the sidewall of the cylinder.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eMachined Radius Edge\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eEach edge on the crown has been machined with a radius edge to eliminate possible hot spots that yield better flame travel. This will prevent damage to the piston in one particular area.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eWrist Pin Broaches \u0026amp; Double Pin Oiler\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eEvery performance piston requires proper lubrication which is commonly forgotten about once it comes down to the actual piston. Our design includes specialized oiler grooves inside the wrist pin location. The oil enters the grooves through the broached machined ports. The broaches are machined precisely to allow the proper amount of oil in for lubrication. It helps with preventing piston pin wear and seizing by keeping the entire pin oiled.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eFrictionless Coating\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eEach piston comes with a specialized coating on the skirt edges that reduces piston slap and is made to be frictionless. This allows the piston to move even more freely in the cylinder. This coating reduces scuffing and provides back-up lubrication and works well with engines with longer rods and Nickasil cylinders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eV-Shaped Accumulator Groove\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe V-Shaped groove that sits between the first and second ring was machined with an intentional purpose of relieving the top ring by adding volume between them. What it does is accumulates residual gasses from the combustion chamber. This will help prevent premature wear on the rings and provides an overall improved ring seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCR9E Spark Plug\u003c\/li\u003e\n\u003cli\u003eOEM Base Gasket\u003c\/li\u003e\n\u003cli\u003eOEM Head Gasket\u003c\/li\u003e\n\u003cli\u003eForged High Compression Piston\u003c\/li\u003e\n\u003cli\u003eWrist Pin\u003c\/li\u003e\n\u003cli\u003eClips\u003c\/li\u003e\n\u003cli\u003ePiston Rings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLightweight\u003c\/li\u003e\n\u003cli\u003eForged Piston\u003c\/li\u003e\n\u003cli\u003eHigh compression\u003c\/li\u003e\n\u003cli\u003eFits 2 Valve Cylinder Heads\u003c\/li\u003e\n\u003cli\u003eWorks with stock OEM Head\u003c\/li\u003e\n\u003cli\u003eWorks with Big Valve Head\u003c\/li\u003e\n\u003cli\u003eRequires different spark plug\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e**NOT CAMPATIBLE WITH TB CAM**\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cem\u003eCannot Sell In California. Check Local Laws Before Installing. Race Waiver Available In California.\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size: xx-small; color: #ff0000;\"\u003eElectrical items are Non-Returnable, Non-Refundable \u0026amp; have no Warranty. Please contact us if you have any questions or concerns. Use at own risk. FOR CLOSED COURSE COMPETITION ONLY; NOT INTENDED FOR STREET USE.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: xx-small;\"\u003e\u003cimg src=\"https:\/\/www.p65warnings.ca.gov\/sites\/default\/files\/warning.svg\" alt=\"\" width=\"14\" height=\"12\"\u003eWARNING: Cancer and Reproductive Harm - \u003ca href=\"https:\/\/www.p65warnings.ca.gov\/\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"DROWsports","offers":[{"title":"Default Title","offer_id":49166757822748,"sku":"MSX-3002","price":99.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/honda_grom_high_compression_125cc_piston_1.jpg?v=1718891048"},{"product_id":"taida-polaris-rzr-170-67mm-water-cooled-performance-cylinder-kit-forged-piston","title":"Taida Polaris RZR 170 67mm Water-cooled Performance Cylinder Kit - Forged Piston","description":"\u003cp\u003eIf you are looking to increase power on your Polaris RZR 170, this is the way to go. The Taida 67mm Performance Cylinder Kit is a complete package that includes the cylinder and piston, gaskets, piston rings, and wrist pin. This specific cylinder is the water-cooled verison. It offers the best cooling capabilities and power. The cylinder fits 57mm head stud spacing (considered \"B\" cases) and comes ready to install with water cool fittings. We all know heat is the number one enemy! Running a water cooled cylinder provides the best cooling capabilities. The cylinder also includes two different gaskets, a thin gasket (high compression) and a thick gasket (low compression). The cylinder is accompanied by a forged piston. Our specially designed forged piston is manufactured specifically for our kit. Each piston is machined down to reduce weight and keep its structural integrity. This is one of our line of DROWspec pistons and cylinder kits. It does not include any water pumps, radiators or hoses. Those must be purchased seperately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePolaris RZR 170\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWater Cooled\u003c\/li\u003e\n\u003cli\u003eCeramic Cylinder\u003c\/li\u003e\n\u003cli\u003eBetter cooling capabilities\u003c\/li\u003e\n\u003cli\u003eHigh and Low compression gaskets\u003c\/li\u003e\n\u003cli\u003eForged Piston\u003c\/li\u003e\n\u003cli\u003e57mm Stud Spacing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"font-size: xx-small;\"\u003e\u003cimg src=\"https:\/\/www.p65warnings.ca.gov\/sites\/default\/files\/warning.svg\" width=\"14\" height=\"12\"\u003eWARNING: Cancer and Reproductive Harm - \u003ca href=\"https:\/\/www.p65warnings.ca.gov\/\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"Taida","offers":[{"title":"Default Title","offer_id":49166759231772,"sku":"TDCK-GY6-67-021HW-RZR","price":429.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/taida-polaris-rzr170-67mm-bbk-water-cool.jpg?v=1718890937"},{"product_id":"drowsports-honda-grom-monkey-ls-cnc-ported-27mm-21-5mm-cylinder-head","title":"DROWsports Honda Grom\/Monkey LS CNC Ported 27mm\/21.5mm Cylinder Head","description":"\u003cp\u003eDROWsports DROWspec'd Honda Grom\/Monkey Cylinder Head is our own original design that features unique qualities that we've implemented to set it apart from everyone else. This is not your typical Ported Big Valve Cylinder Head.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBenefits of our Cylinder Heads\u003c\/strong\u003e\u003cbr\u003eOur fully built cylinder heads use the OEM Honda base cylinder heads. This offers a true and surefire fitment onto your cylinder. Each OEM cylinder head is ported to match the KOSO 34mm intake manifold and throttle body. The design of porting that our head offers maintains a smooth and consistent surface for air to flow on. Removing any major lips or sharp edges that can cause air to tumble or limit flow. By keeping a similar diameter intake and exhaust tract, there are no longer any air limitations entering and exiting. This is achieved by using top-line equipment.\u003c\/p\u003e\n\u003cp\u003eTo match the new larger intake and exhaust we've paired it with larger intake and exhaust valves. This is the next step for your piston to receive and expel the proper amount of air. Before installing, the valve seats get CNC machined for a flush and perfect fit. Having a precise fit for valves ensures no leaking. Having a valve that doesn't seat correctly due to improper machining can cause a burnt valve. Burnt valves won't transmit heat through the head properly causing it to become extremely hot. This can severely damage your top end and not allow your vehicle to run properly. Ours are made to match the 27mm intake valve and 21.5mm exhaust valve.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional components you may need\u003c\/strong\u003e\u003cbr\u003eWe recommend running our ported big valve cylinder head with a few other modifications to ensure the best performance and reliability.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandalone adjustable ECU\u003c\/li\u003e\n\u003cli\u003eLarger Intake Manifold \u0026amp; Throttle Body\u003c\/li\u003e\n\u003cli\u003eHigh Compression or Big Bore 2v Cylinder\u003c\/li\u003e\n\u003cli\u003eAftermarket Exhaust System\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2 Valve 125cc Big Valve Ported Cylinder Head\u003c\/li\u003e\n\u003cli\u003eCNC Machined Radius Valve Job\u003c\/li\u003e\n\u003cli\u003e27mm Intake Valve \/ 21.5mm Exhaust Valve\u003c\/li\u003e\n\u003cli\u003eOptional Performance Camshafts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cem\u003eCannot Sell In California. Check Local Laws Before Installing. Race Waiver Available In California.\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size: xx-small; color: #ff0000;\"\u003ePlease contact us if you have any questions or concerns. Use at own risk. FOR CLOSED COURSE COMPETITION ONLY; NOT INTENDED FOR STREET USE.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: xx-small;\"\u003e\u003cimg height=\"12\" width=\"14\" alt=\"\" src=\"https:\/\/www.p65warnings.ca.gov\/sites\/default\/files\/warning.svg\"\u003eWARNING: Cancer and Reproductive Harm - \u003ca href=\"https:\/\/www.p65warnings.ca.gov\/\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e","brand":"DROWsports","offers":[{"title":"Grom (Black)","offer_id":53168492478748,"sku":"MSX-3004B","price":549.0,"currency_code":"USD","in_stock":true},{"title":"Monkey (Silver)","offer_id":53168492511516,"sku":"MSX-3004S","price":549.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/honda_grom_ported_intake_manifold.jpg?v=1718891165"},{"product_id":"polaris-rzr-170-stock-replacement-cylinder-kit-61mm","title":"Polaris RZR 170 Stock Replacement Cylinder Kit 61mm","description":"\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eRZR 170 engine really takes a beating especially if its used in racing competition and its not uncommon to burn out the piston rings prematurely. We recommend frequent oil changes as a preventative maintenance.\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eCylinder kits are one of the most important factors when it comes to rebuilding your top end or improving and increasing the performance of your Polaris RZR 170. And if you’ve been using your UTV for a while, chances are you’ll be needing a replacement soon. With this replacement cylinder kit, you will get the look and feel of a brand new RZR 170. This kit comes complete with the rings, wrist pin, and c-clip all included. \u003c\/span\u003eIf you have any questions with this kit, please \u003cstrong\u003e\u003ca href=\"https:\/\/www.drowsports.com\/contact\/\"\u003econtact us\u003c\/a\u003e\u003c\/strong\u003e before purchasing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003e1 x Cylinder\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003e1 x Piston\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003e1 x Wrist Pin\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003e1 x Piston Rings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003e2 x C-clip\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003e1 x Base Gasket\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"font-weight: 400;\"\u003e1 x Head Gasket\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Polaris","offers":[{"title":"Default Title","offer_id":49166799700252,"sku":"RZR170-2100","price":240.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/rzr-170-cylinder-kit.jpg?v=1718891523"},{"product_id":"polaris-rzr-170-replacement-cylinder-head-assy","title":"Polaris RZR 170 Replacement Cylinder Head Assy","description":"\u003cp dir=\"auto\"\u003eRevive your Polaris RZR 170's engine with this premium replacement cylinder head assembly, engineered for seamless compatibility and peak performance. Ideal for rebuilds, repairs, or upgrades, this part restores optimal compression, valve timing, and overall power output in your youth-sized UTV. Crafted to OEM standards, it fits models from 2009 through 2020, ensuring durability on trails and tracks.\u003c\/p\u003e\n\u003ch4 dir=\"auto\"\u003eKey Features:\u003c\/h4\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Assembly\u003c\/strong\u003e: Includes pre-installed intake and exhaust valves, valve springs, retainers, seals, and rocker arms for a hassle-free installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Quality Materials\u003c\/strong\u003e: Constructed from robust aluminum alloy to withstand high temperatures and off-road abuse, with precision-machined ports for improved airflow.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecifications\u003c\/strong\u003e:\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eEngine Displacement: 170cc (compatible with standard and some modified setups; aftermarket 180cc options available).\u003c\/li\u003e\n\u003cli\u003eExhaust Valve Diameter: Approximately 22.8mm.\u003c\/li\u003e\n\u003cli\u003eExhaust Port Diameter: 22mm.\u003c\/li\u003e\n\u003cli\u003eBolt Hole Spacing: 50mm (exhaust port).\u003c\/li\u003e\n\u003cli\u003ePart Reference: Equivalent to OEM #0455058 or similar.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Performance\u003c\/strong\u003e: Improves combustion efficiency, reduces wear on related components like pistons and gaskets, and helps maintain smooth idling and acceleration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 dir=\"auto\"\u003eCompatibility:\u003c\/h4\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eModels\u003c\/strong\u003e: Polaris RZR 170 (all variants, including EFI models).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYears\u003c\/strong\u003e: 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNotes\u003c\/strong\u003e: Verify your specific model (e.g., Z20YAV17 series) for exact fitment. Not compatible with adult-sized RZR models or other Polaris vehicles.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Polaris","offers":[{"title":"Default Title","offer_id":49166799896860,"sku":"RZR170-2200","price":240.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/rzr_170_cylinder_head.jpg?v=1718891533"},{"product_id":"taida-rzr-170-63mm-water-cooled-cylinder-kit-2-valve-forged-high-compression-piston","title":"Taida RZR 170 Cylinder Kit - 63mm Watercooled Cylinder","description":"\u003cp data-start=\"185\" data-end=\"245\"\u003e\u003cstrong data-start=\"185\" data-end=\"243\"\u003eTaida 63mm Water-Cooled Cylinder Kit – Polaris RZR 170\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"247\" data-end=\"467\"\u003eTired of your engine fan pulling in dirt and rocks into the engine shroud? Looking for a real performance boost for your Polaris RZR 170? The Taida 63mm Water-Cooled Cylinder Kit is the upgrade you’ve been waiting for.\u003c\/p\u003e\n\u003cp data-start=\"469\" data-end=\"961\"\u003eBy switching to a water-cooled system, you eliminate the need for a fan, reducing issues caused by debris while improving cooling efficiency. Unlike traditional air-cooled systems that struggle to keep up—especially during long races in high temperatures—this setup uses a radiator to continuously circulate coolant, keeping your engine at optimal temperature. Even under heavy throttle and hot race conditions, you’ll experience consistent performance with little to no overheating issues.\u003c\/p\u003e\n\u003cp data-start=\"963\" data-end=\"1109\"\u003eThis kit is designed for riders who want reliability and performance, whether it’s for racing or simply pushing their RZR 170 to the next level.\u003c\/p\u003e\n\u003cp data-start=\"1111\" data-end=\"1175\"\u003e\u003cstrong data-start=\"1111\" data-end=\"1120\"\u003eNote:\u003c\/strong\u003e Water pump, radiator, and hoses are sold separately.\u003c\/p\u003e\n\u003cp data-start=\"1177\" data-end=\"1196\"\u003e\u003cstrong data-start=\"1177\" data-end=\"1194\"\u003eApplications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1197\" data-end=\"1216\"\u003e\n\u003cli data-start=\"1197\" data-end=\"1216\"\u003e\n\u003cp data-start=\"1199\" data-end=\"1216\"\u003ePolaris RZR 170\u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1197\" data-end=\"1216\"\u003eLow Deck (Stock RZR 170 Crankshaft)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1218\" data-end=\"1233\"\u003e\u003cstrong data-start=\"1218\" data-end=\"1231\"\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1234\" data-end=\"1424\"\u003e\n\u003cli data-start=\"1234\" data-end=\"1270\"\u003e\n\u003cp data-start=\"1236\" data-end=\"1270\"\u003e57mm head stud spacing (B cases)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1271\" data-end=\"1332\"\u003e\n\u003cp data-start=\"1273\" data-end=\"1332\"\u003eIncludes two gaskets (high compression \u0026amp; low compression)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1333\" data-end=\"1365\"\u003e\n\u003cp data-start=\"1335\" data-end=\"1365\"\u003eForged piston for durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1366\" data-end=\"1424\"\u003e\n\u003cp data-start=\"1368\" data-end=\"1424\"\u003eSuperior cooling efficiency for racing and performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Taida","offers":[{"title":"2-Valve","offer_id":53085046374684,"sku":"TDCK-GY6-63-021LW","price":449.0,"currency_code":"USD","in_stock":true},{"title":"4-Valve","offer_id":53085046407452,"sku":"TDCK-GY6-63-021LW-4V","price":449.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/rzr_170_watercooled_cylinder_kit_forged_piston.png?v=1718891607"},{"product_id":"drowsports-honda-grom-ls198-4-valve-big-bore-cylinder-kit","title":"DROWsports Honda Grom LS198 4 Valve Big Bore Cylinder Kit","description":"\u003cp\u003eDROWsports x LimitSport NEW 66mm Big Bore Cylinder Kit for the 2014-2020 Honda Grom\/MSX125 and 2019-2020 Honda Monkey was designed specifically for the KOSO Grom 4v Head. We wanted to offer an affordable upgrade from our LS181 63mm cylinder. Taking features from the 181cc piston like; lightweight piston, strutted design piston, radius edge dome etc and applied it to our kit. We love everything about our 63mm LS181 but we wanted a little even more displacement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2014-2020 Honda Grom 125\u003c\/li\u003e\n\u003cli\u003e2019-2020 Honda Monkey 125\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePiston Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e66mm Forged Piston (198cc)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe 4 valve piston comes forged, which is one of the best options for performance and reliability. Forged pistons compared to cast pistons are much stronger and more reliable due to their manufacturing process. The forging process gives it stronger structural integrity over cast pistons. Forged has a smooth and consistent grain structure due to the heat and pressing process.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eLightweight\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003e(Not all forged pistons are the same) Compared to the other Grom 4 valve pistons, our 66mm piston only is probably one of the lightest available.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eCNC Machined\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eOnce these are finished being forged, they are precision CNC machined. Machining it versus pouring metal into a cast allows the piston to have higher tolerances. This is a more expensive process but provides the highest performance option available. For this reason alone, it allows the best seal with the piston rings inside the cylinder.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eStrutted Piston Skirt\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe piston skirt utilizes a strutted design over a full round design. Having a strutted design not only reduces the weight but provides key points that can be machined to increase overall piston strength where the rods connect. This characteristic shaves off undesired weight and can be designed to help keep piston structure sturdy. This also helps with less friction due to reduced amounts of material against the sidewall of the cylinder.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eMachined Radius Edge\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eEach edge on the crown has been machined with a radius edge to eliminate possible hot spots which yield better flame travel. This will prevent damage to the piston in one particular area.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eWrist Pin Broaches \u0026amp; Double Pin Oiler\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eEvery performance piston requires proper lubrication which is commonly forgotten about once it comes down to the actual piston. Our design includes specialized oiler grooves inside the wrist pin location. The oil enters the grooves through the broached machined ports. The broaches are machined precisely to allow the proper amount of oil in for lubrication. It helps with preventing piston pin wear and seizing by keeping the entire pin oiled.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eFrictionless Coating\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eEach piston comes with a specialized coating on the skirt edges that reduces piston slap and is made to be frictionless. This allows the piston to move even more freely in the cylinder. This coating reduces scuffing and provides backup lubrication and works well with engines with longer rods and Nickasil cylinders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eV-Shaped Accumulator Groove\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe V-Shaped groove that sits between the first and second ring was machined with the intentional purpose of relieving the top ring by adding volume between them. What it does is accumulates residual gasses from the combustion chamber. This will help prevent premature wear on the rings and provides an overall improved ring seal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCylinder Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCylinder Performance\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eDROWsports 66mm Big Bore Cylinders are all machined and specially designed for performance and reliability. Since these cylinders are paired with such a high-performance cylinder and cylinder head, we had to make sure it lasts! This cylinder is similar to the KOSO 170cc cylinder except we've expanded on it to create an even more durable product.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eCeramic-Coated Cylinder\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eThe ceramic cylinder was a clear choice for heat dissipation and reliability. This type of cylinder creates a stronger exterior surface while efficiently alleviating the heat.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\u003cstrong\u003eElectroplated Nikasil Walls\u003c\/strong\u003e\u003c\/li\u003e\n\u003cul\u003e\n\u003cli\u003eWe've combined this with another unique coating for the ultimate cylinder performance. The inside wall is electroplated with Nikasil. Silicon Carbide is an extremely hard ceramic compound that is dissolved and electroplated onto the cylinder walls using Nickel. This process makes the cylinder walls even more durable and allows the engine tolerances to be much tighter. Tighter tolerances mean better performance capabilities.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e66mm Forged Piston for Grom KOSO 4Valve Head\u003c\/li\u003e\n\u003cli\u003e66mm Ceramic Cylinder*\u003c\/li\u003e\n\u003cli\u003ePiston Rings\u003c\/li\u003e\n\u003cli\u003e15mm Piston Pin*\u003c\/li\u003e\n\u003cli\u003ePiston Clips\u003c\/li\u003e\n\u003cli\u003eHead Gasket\u003c\/li\u003e\n\u003cli\u003eBase Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003e*this is not a drop in a big bore kit, will require machine work.\u003c\/em\u003e\u003c\/p\u003e","brand":"DROWsports","offers":[{"title":"Default Title","offer_id":49166823031068,"sku":"MSX-2010","price":300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/limitsport-grom-66mm-big-bore-kit-198cc.jpg?v=1718891810"},{"product_id":"taida-rzr-170cc-2v-performance-cylinder-kit-61mm-forged-high-compression-piston","title":"Taida RZR 170cc 2V Performance Cylinder Kit - 61mm Forged High Compression Piston","description":"\u003cp\u003eThe DROWspec 61mm Polaris RZR 170 Performance Cylinder Kit is designed for customers that is looking to keep the OEM displacement of the RZR 170 but is looking for more power. This kit is still reliable on pump gas 93oct.  This is not the same as a stock cast piston. The kit comes with two options for paper base gaskets to help fine tune requirements from end user. It comes with a thinner gasket for higher compression and a thicker gaster to help lower compression.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eDROWspec High Compression Forged Piston\u003c\/li\u003e\n\u003cli\u003eHigh Tolerance Cylinder\u003c\/li\u003e\n\u003cli\u003eRZR 170 specific Cylinder\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBore: 61mm\u003c\/li\u003e\n\u003cli\u003ePiston: 61mm Forged\u003c\/li\u003e\n\u003cli\u003eHead Stud Spacing: 57mm\u003c\/li\u003e\n\u003cli\u003eDisplacement: 170cc\u003c\/li\u003e\n\u003cli\u003e1 Thin Base Gasket (High Compression)\u003c\/li\u003e\n\u003cli\u003e1 Thick Base Gasket (Low Compression)\u003c\/li\u003e\n\u003cli\u003e1 Head Gasket\u003c\/li\u003e\n\u003cli\u003e1 Piston Pin\u003c\/li\u003e\n\u003cli\u003e2 Piston Pin Clip\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Taida","offers":[{"title":"Default Title","offer_id":49166827159836,"sku":"TDCK-GY6B-61-022","price":229.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/tdck-gy6a-61-021-00__1.jpg?v=1718891656"},{"product_id":"koso-grom-4v-cylinder-head-replacement-parts","title":"KOSO Honda Grom 4V Cylinder Head (Bare Replacement)","description":"KOSO’s replacement parts for the Grom 4V Cylinder Head is the perfect part for completing the KOSO Big Bore kit. This replacement head is great for those of you looking for a bump in power and torque, please note this kit will only fit 2014-2020 Groms with the KOSO 170cc Big Bore Kit. This kit features: a feature, stainless steel 24mm intake valves, and 20mm exhaust valves.","brand":"KOSO","offers":[{"title":"Default Title","offer_id":49166874706204,"sku":"KOSO-MSX4V","price":475.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/koso-grom-4-valve-replacement-parts.jpg?v=1718892302"},{"product_id":"koso-honda-grom-4v-rocker-arm-exhaust","title":"KOSO 4V Rocker Arm (Exhaust) - Honda Grom","description":"\u003cp\u003eKOSO Honda Grom 4V Rocker Arm - Exhaust\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan style=\"color: rgb(119, 119, 119); font-family: 'Open Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: 0.07px; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;\"\u003eKOSO’s replacement parts for the Grom 4V Cylinder Head is the perfect part for completing the KOSO Big Bore kit. This replacement head is great for those of you looking for a bump in power and torque, please note this kit will only fit 2014-2020 Groms with the KOSO 170cc Big Bore Kit. This kit features: a feature, stainless steel 24mm intake valves, and 20mm exhaust valves.\u003c\/span\u003e\u003c\/p\u003e","brand":"KOSO","offers":[{"title":"Default Title","offer_id":49166878245148,"sku":"XT623MT101","price":67.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/koso-4-valve-exhaust-rocker-arm-grom.jpg?v=1755127694"},{"product_id":"tb-parts-gasket-kit-55mm-crf110","title":"TB Parts Gasket Kit, 55mm CRF110","description":"The TB Parts 55mm Top End Gasket kit is a top end replacement gasket kit for the Honda CRF110. This kit is designed for the TB parts 132cc Big Bore Kit and includes 2 base gaskets.","brand":"TBparts","offers":[{"title":"Default Title","offer_id":49166894399772,"sku":"TBW0893","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/tb-parts-crf110-55mm-gasket-kit-132cc-big-bore.jpg?v=1718892403"},{"product_id":"tb-parts-replacement-piston-kit-55mm-crf110","title":"TB Parts Replacement Piston Kit, 55mm CRF110","description":"The TB Parts Replacement Piston Kit (55mm) comes with a lightweight piston and rings with 13mm wrist pins included. This replacement kit is made for the Honda CRF110 132cc big bore kit and is a great replacement if your current piston is damaged.","brand":"TBparts","offers":[{"title":"Default Title","offer_id":49166894530844,"sku":"TBW0892","price":75.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/tb-parts-132cc-crf110-replacement-piston-55mm.jpg?v=1718892409"},{"product_id":"tb-parts-132cc-big-bore-kit-crf110-13-up-models","title":"TB parts 132cc Big Bore Kit – CRF110 13 \u0026 Up Models","description":"\u003cp\u003eThe TB parts 132cc Big Bore Kit for the +2013 Honda CRF110 is a great performance upgrade for any enthusiast. This big bore kit is an ideal option for those looking to add power, or you just need to replace your current cylinder, piston, and rings. This is the largest bore you can do for more power without boring out the cases. The cylinder in this kit includes a temperature sensor port for the 2019+ fuel injected models and runs on 91 octane fuel, making the kit an easy bolt-on mod at an affordable price. 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