Koso 170cc Big Bore Kit with 4 Valve Head - Honda Grom  MSX125

Koso 170cc Big Bore Kit with 4 Valve Head - Honda Grom MSX125
Want to unleash all the potential power of your Honda GROM? Koso's 170cc Big Bore Cylinder kit for Honda GROM is the perfect addition for you ! The kit includes a ceramic coated cylinder, 61 mm forged piston, rings, pin, gasket kit and banjo bolts. Its compression ratio of 11.5 to 1 will allow you to still use premium pump gas and keep the reliability of a stock motor. Made from the best components available on the market, our 170cc GROM® big bore cylinder kit will amaze you  !

- 11.5:1 Compression Ratio
- Forged 61mm Piston (169.2cc)
- Aluminum / Ceramic coated
- Performance Camshaft
- Rocker Arms
- 4 Valve Cylinder Head
- Intake Manifold
- Gaskets and more

All parts are made from High‑quality components for reliability and durability that allow you to put your mind at ease and ride with confidence!


All of the above parts are not legal for use in California on pollution controlled vehicles. (Road going vehicles) However a race waiver is available.