Airsal 77cc Racing cylinder kit, complete with all necessary parts, such as gasket set, piston, piston rings, etc. incl. cylinder head. The 77cc M-Racing has the same timing as the 77cc Racing and has a 2-Piece outlet. The difference is the high quality single ring MAHLE piston. Aluminium with hard-chromed bore. For Minarelli AM engines found in CPI scooters with threaded exhaust manifold and not the common push-on (spring held).