Description Upgraded 100cc Cylinder Head & Valve Assembly QMB139 / QMI139 4-Stroke Engines. Our high quality parts are the exact replacement part for many Chinese manufactured brands and models of Chinese Mopeds and Scooters.  ...

  Upgraded 60cc Cylinder Head & Valve Assembly QMB139 / QMI139 4-Stroke Engines. Our high quality parts are the exact replacement part for many Chinese manufactured brands and models of Chinese Mopeds and Scooters.  ...

Description Upgraded 60cc Cylinder Head & Valve Assembly QMB139 / QMI139 4-Stroke Engines.     69mm Valves Intake Bolt Hole Spacing: 44.75mm Exhaust Bolt Hole Spacing: 49.75mm

Description Upgraded 80cc Cylinder Head & Valve Assembly QMB139 / QMI139 4-Stroke Engines. Our high quality parts are the exact replacement part for many Chinese manufactured brands and models of Chinese Mopeds and Scooters.  ...

Description Includes: Cylinder, 61 mm piston, clips, piston pin, head gasket and base gasket,    If the fins on your cylinder look different than the one in the picture then the kit may not work. May require the case to be milled. The...

Includes: Cylinder, 61 mm Piston Clips Piston pin Head gasket and base gasket Head Big valve non emissions head A9 Camshaft   Head comes with performance springs, retainers and keepers intake valve is 27 mm, exhaust is 23 mm...

Description A9 Performance Racing Cam   Performance Racing Cam Fits GY6 125cc / 150cc 4-Stroke Engines This is a great Performance up-grade when installing a big bore kit or a Performance Exhaust In Stock & Ships...