Koso 170cc Big Bore Kit for Honda Grom 15-17

Regular price $344.95

Unleash all the power your Grom can handle with this big bore kit.



  • Allows you to use pump fuel with a compression ratio of 11.5 to 1
  • Retains the reliability of a stock motor
  • Includes ceramic-coated cylinder, 61mm forged piston, rings, pin, gasket kit and banjo bolts
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