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

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

Specifications:

• 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