72cc Scooter Big Bore Kit W/ Head Cam GY6 Coil AC CDI Performance Exhaust

72cc GY6 QMB139 Four Stroke Big Bore Kit 72cc 47mm. Increase Power by up to 30% and torque by up to 50%. Each kit includes: Milled Emissions style head with 18mm intake 16mm exhaust valves and high performance springs. Cylinder, piston, piston rings, piston pin, and clips. Valve Stems are 69mm long. Top end gaskets. Performance Camshaft with 4.75mm intake stroke 4.55 exhaust and 123 degree lift angle. Re Jetted Carburetor with a 85 Main and a 32 Pilot Jet. 31,000 Volt HEI Coil. Performance AC CDI With 4 degrees of advance and no rev limiter. This combination will fit many Chinese brands, such as TaoTao, Buyang, Coolsport, NST, BMX, Kazuma, Sunl, ROKETA, AIM-EX etc. May not work on your Lance, Kymco or Zhongchen model scooters. K&N Style Filter (colors can vary). Performance Exhaust Kit. Please Note: All head pipes and brackets are chrome plated carbon steel.