139QMB 90cc Cylinder Kit

139QMB 90cc high performance cylinder kit for Gy6 50cc 4 stroke engines. This kit is the monster of them all. Bigger is definitely better when it comes to this cylinder kit. The dome of the piston is designed to work with your stock head but is a better match with the 80cc or 85cc heads. Performance carburetors, exhaust and rollers weights are also available to add to this setup.

Kit Includes:

• Cylinder Head (52mm)
• Piston
• Piston Rings
• Wrist Pin
• Circlips
• Gaskets