Minarelli Style 2-Stroke Upgraded High Performance Motorized Bike with bonus head gasket! Super power ENGINE ALREADY ASSEMBLED. Just add the intake manifold/gaskets and carburetor. ENGINE ONLY. All other motorized bike kit parts including exhaust gasket and carburetor sold separately, Piston: 47mm Includes mounting hardware and spark plug! Bonus head gasket included!!!! Balanced Crank Requires Exhaust that fits intake. Normal 66cc/80 exhaust will not fit engine.