Kit includes: Diaphragm (if needed), face gasket, o-rings, wave washers, face screws and tank boltsOrder 1 kit per petcock

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

Kit includes: Diaphragm (if needed), face gasket, o-rings, wave washers, face screws and tank boltsOrder 1 kit per petcock

Kit includes: Diaphragm (if needed), face gasket, o-rings, wave washers, face screws and tank boltsOrder 1 kit per petcock

Kit includes: Diaphragm (if needed), face gasket, o-rings, wave washers, face screws and tank boltsOrder 1 kit per petcock

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...

Kit includes: Diaphragm (if needed), face gasket, o-rings, wave washers, face screws and tank boltsOrder 1 kit per petcock

Kit includes: Diaphragm (if needed), face gasket, o-rings, wave washers, face screws and tank boltsOrder 1 kit per petcock