Airsal 50cc Racing cylinder kit, complete with all necessary parts, such as gasket set, piston, piston rings, etc. incl. cylinder head 50cc Tech-Piston is identical to the 50cc sport. 2-Piece outlet with high quality single ring piston. Aluminium with hard-chromed bore. Performance-wise, up there with 70cc cylinders, but with different timing options. Good torque and acceleration gains.