170cc Koso Big Bore Cylinder Kit w/4V Cylinder Head for 125cc Honda Grom, MonkeySPECIFICATIONS: Cylinder Displacement: 169.2ccCylinder Material: Aluminum/Ceramic CoatedCylinder Overall Height: 90.5mmPiston Diameter: 61mmPiston Type: ForgedCompression Ratio: 11.5 to 1This complete 170cc Big Bore Kit with 4V Cylinder Head Kit is the perfect add?on for all horsepower enthusiasts looking for performance! It includes a 170cc ceramic coated cylinder, forged piston, performance camshaft, bearing, 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!***WARNING: THIS IS AN AFTERMARKET PART BUILT FOR RACING PURPOSES ONLY. Scooterdynasty.com and KOSO ARE NOT RESPONSIBLE FOR ANY DAMAGES CAUSED TO THE PARTS, VEHICLE, OR TO YOURSELF AND OTHERS. ENGINE PARTS ARE NOT UNDER WARRANTY NOR IS COLLATERAL DAMAGE OR COST OF LABOR, IN CASES OF MALF