Amazon.com: Glixal ATGT-12Z GY6 49cc 50cc to 100cc Scooter Engine 50mm Cylinder Head Assy with Valves Set for 139QMB 139QMA Chinese Moped ATV Go Kart Quad (Non EGR Type, 69mm Valves) :
Amazon.com: FLYPIG Scooter Moped Kick start Gear Starter shaft Starter Lever Rebuild Kit idle Gear Spring fit for 49cc 50cc 80cc GY6 139QMB P139QMB 4 stroke engine (49cc-80cc) : Automotive
Amazon.com: CLEO GY6 50cc-100cc Cylinder Head Kit Assy 50mm Big Bore with 69mm Valves for 139QMA 139QMB Engine Scooter Moped ATV Go Kart Quad : Automotive