47mm QMB139 Cylinder Kit

50cc QMB139 4-stroke 47mm, Performance Cylinder Kit. Upgrades to 72cc!

Kit includes cylinder, piston, rings, piston pin, cir clips, head gasket, and base gasket.

*You may need to modify your engine case to accommodate the larger cylinder.

• Upgrades to 72cc
• Cylinder Bore: 47mm
• Cylinder Sleeve Outer Diameter: 52.7mm 
• Wrist Pin Diameter: 13mm
• Total Piston Height: 34.4mm
• Compression Height (from center of wrist pin hole to top edge of piston): 17.25mm