Airsal 70cc Racing cylinder kit, complete with all necessary parts, such as gasket set, piston, piston rings, etc. 2-Piece outlet with a high quality piston (2 rings). Aluminium with hard-chromed bore. Performance-wise, the Tech-Piston has different timing options, but a simple pipe will yield about 12 bhp A large carburettor should be used. Supplied with cylinder head.