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Performance Racing CDI (AC Fired), Performance Racing High Output Coil, Performance High Flow Air Filter 20mm KEI HIN Carburetor with removable bowl (not a sealed carburetor), Head is Completely Assembled Ready to Install With Rocker Arms to Match the Head (Non EGR Head) The Head Has 18mm & 16mm Valves, (We have the Big Valve Head Kits Listed in our Ebay Store) 50mm Piston Set With Rings & Wrist Pin Big Bore Main Jet, Rocker Arm Set, 8 Gram Roller Weights, Intake & Exhaust Studs. Fits 139QMB & 1P39QMB /GY6 50cc 4 Stroke Chinese Scooters Be Sure and Visit our Ebay Store We have more Big Bore Kits & Performance Parts as Well as Stock replacement parts