SSP-G 63mm 180cc Long Case Big Bore Power Kit for 125cc – 150cc GY6 Scooters, ATVs, and Go KartsSPECIFICATIONS: Cylinder Bore: 63mmOverall Left Crankcase Length: 20 inchesIncludes All GasketsThis complete Power Pack comes with a 63mm cylinder and matching long case crankcase with all of the oil seals installed. This means there is no machining required unlike all other kits on the market.Includes the following: 63mm cylinder, piston, rings, pin, clips, Super HP 2-valve head, valve cover, camshaft, rocker arm assembly, cylinder mounting studs, complete gasket set, bushings for right-hand and left-hand cases, and bearings. **