{"product_id":"dhm-2022-grom-monkey-149cc-big-bore-kit","title":"DHM 2022+ Grom \/ Monkey 149cc Big Bore Kit","description":"\u003cp dir=\"ltr\" class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe 2022+ Grom and Monkey run great from the factory — until you start chasing more. The DHM 149cc Big Bore Kit is the cleanest way to add real, usable power to your Gen 2 without splitting the cases. Ditch the stock 123.9cc setup, drop in a bigger bore, and feel the difference everywhere the tach lives — stronger roll-on, harder pull out of corners, and more grunt to carry that extra weight when you've got a passenger or a loaded frame slider setup.\u003c\/p\u003e\n\u003cp dir=\"ltr\" class=\"font-claude-response-body break-words whitespace-normal\"\u003eThis kit is built specifically for the Gen 2 platform (2022 and up), so you're not fighting head-clearance or timing quirks that come from adapting a Gen 1 part. It's a straightforward install for anyone comfortable pulling a top end, and it plays nicely with the mods you've probably already got your eye on — intake, exhaust, and tuning.\u003c\/p\u003e\n\u003cp dir=\"ltr\" class=\"font-claude-response-body break-words whitespace-normal\"\u003eRuns the stock 5-speed and factory EFI. Pair it with a tune to unlock the full package.\u003c\/p\u003e\n\u003cp dir=\"ltr\" class=\"font-claude-response-body break-words whitespace-normal\"\u003e\u003cstrong\u003eBullet highlights:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul 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\" dir=\"ltr\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBumps displacement from 123.9cc to 149cc for a noticeable mid-and-top-end gain\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eEngineered for the 2022+ Gen 2 Grom \u0026amp; Monkey — correct fitment, no Gen 1 workarounds\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBolt-on top-end install — no case splitting required\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eBore: \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]\"\u003e55 mm\u003c\/code\u003e \/ Stroke: 63.1 (stock stroke retained) \u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eCompression ratio: 12:1\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eWorks with stock EFI; tune recommended to maximize gains\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eKit includes: cylinder, piston, rings, wrist pin, clips, and gaskets \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecs block:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"overflow-x-auto w-full px-2 mb-6\" dir=\"ltr\"\u003e\n\u003ctable class=\"min-w-full border-collapse text-sm leading-[1.7] whitespace-normal\"\u003e\n\u003cthead class=\"text-left\"\u003e\n\u003ctr\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eSpec\u003c\/th\u003e\n\u003cth class=\"text-text-100 border-b-0.5 border-[hsl(var(--border-300)\/0.6)] py-2 pr-4 align-top font-bold\" scope=\"col\"\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eFitment\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e2022+ Honda Grom \/ Monkey (Gen 2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eDisplacement\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e149cc \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eBore \u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\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\u003cmeta charset=\"utf-8\"\u003e55mm\u003c\/code\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003ePiston material\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eForged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eCompression\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e12:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eRecommended fuel\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003e\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]\"\u003e91+ bare minimum \/ 93+ preferred\u003c\/code\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eInstall level\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eIntermediate (top-end R\u0026amp;R)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eTuning\u003c\/td\u003e\n\u003ctd class=\"border-b-0.5 border-[hsl(var(--border-300)\/0.3)] py-2 pr-4 align-top\"\u003eAftermarket tune recommended:\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]\"\u003erequired \u003c\/code\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRequired supporting mods:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOil Cooler: \u003ca href=\"https:\/\/www.drowsports.com\/products\/drowsports-2022-honda-grom-the-juggernaut-7-row-oil-cooler-kit?_pos=1\u0026amp;_sid=bb70e3f67\u0026amp;_ss=r\"\u003eDROW 2022+ Grom Juggernaut Oil Cooler\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eInjector: \u003ca href=\"https:\/\/www.drowsports.com\/products\/honda-pcx150-fuel-injector-assy?_pos=13\u0026amp;_sid=ac6f43c0a\u0026amp;_ss=r\"\u003eGrom PCX Injector Upgrade\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eSpark Plug: \u003ca href=\"https:\/\/www.drowsports.com\/products\/ngk-cr6e-cr10e-spark-plug?_pos=2\u0026amp;_sid=f5d906400\u0026amp;_ss=r\u0026amp;variant=51051204772124\"\u003eNGK CR9E\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"DHM","offers":[{"title":"Default Title","offer_id":53882185482524,"sku":"BBK-001","price":349.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/5679\/8748\/files\/dhm-2022-grom-149cc-big-bore-kit.jpg?v=1785456473","url":"https:\/\/www.drowsports.com\/products\/dhm-2022-grom-monkey-149cc-big-bore-kit","provider":"DROWsports","version":"1.0","type":"link"}