KOSO Honda Grom/Monkey 170cc 4 Valve Performance Cylinder Kit w/ Forged Piston (2014-2020)

From $950.00

To $3,634.80 was $3,645.30

Koso Grom 125 61mm Performance Cylinder Kit with 4 Valve Cylinder Head is probably one of the best big bore kits available on the market for the Grom.
Customize KOSO Honda Grom/Monkey 170cc 4 Valve Performance Cylinder Kit w/ Forged Piston (2014-2020)
1 x KOSO Honda Grom 171 4v Cylinder - Cylinder Head - Piston   + $950.00

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Koso Honda Grom Complete 4 Valve Kit
KOSO Honda Grom/Monkey 170cc 4 Valve Performance Cylinder Kit w/ Forged Piston (2014-2020)

In stock

$950.00

Summary

    Koso 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.

    Need a replacement piston, see our KOSO 4V Replacement Piston Kit.

    Koso Honda Grom 4-Valve Package Includes:

    • Koso 4V Cylinder Head
    • Koso Camshaft
    • Koso Intake Manifold
    • Koso 61mm Ceramic Coated Cylinder
    • Koso 61mm 4V Forged Piston 

    Supporting Parts:

    • Koso 34mm Throttle Body(Required)
    • Honda PCX150cc Injector (Required)
    • aRacer RC Super X or Mini-X Fuel Controller (Required)
    • Spark PlugNGK ER9EH (Required)
    • Koso High Flow Oil Pump (Recommend)
    • Koso Cam Chain Tensioner (Recommend)
    • Kitaco Crankshaft (Recommend)
    • Juggernaut Oil Cooler Kit (Recommend)

     

    Spec:

    • Compression Ratio: 12.3:1
    • Cylinder Displacement: 169.2cc
    • Power: +25hp
    • RPM Redline: 12,500RPM
    • Recommend: 92-93 Octane
    More Information
    SKUMSX-61-4V
    BrandKOSO
    VehicleHonda Grom, Honda Monkey
    Year2014+
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