50cc two-stroke top-end kit for air-cooled horizontal scooter engines (1E40QMB / 1PE40QMB type). A standard replacement or a mild upgrade to freshen up a tired engine. Includes: - Cylinder barrel with standard transfer and exhaust ports - Finned air-cooled cylinder head, still in factory plastic - Piston ring and compression seals New. Please check it matches your engine before buying - I can send measurements or more photos. Well packed, quick shipping.