The BIG daddy! Converts a stock engine to 108cc. TrailBikes kit includes the 51mm Stroker Crankshaft, 52mm Piston Kit, 24mm Carb Kit, Intake Kit, Throttle cable, air filter, 88cc Cylinder, Race Cam, Race Head, and gaskets. HD Clutch Kit is also needed, as well as, the High Volume Oil Pump. FREE HEAD ASSEMBLY INCLUDED!