Includes a ceramic coated cylinder, 61mm forged piston, rings, pin, pin clips, gasket kit, and banjo boltsCompression ratio of 11.5 to 1 allows the use of premium pump gas to keep the reliability of the stock motor

Unleash all the power your Honda GROM can handle with the Koso 170cc Big Bore kit.Ceramic coated aluminum cylinder61mm bore, 11.5:1 compression ratio forged piston/ring kit (premium fuel required)Top end gasket kit and banjo boltsNot legal for use in...

Highly recommended for use with all engine upgradesIncreases oil flow by 40%Helps prevent engine failure and lowers oil temperature