GY6 63mm Big Bore Cylinder Kit

63mm Big Bore Cylinder Kit for 150cc GY6 4-stroke engines. Upgrades to 180cc based on a stock stroke of 57.8mm! Includes cylinder, piston, pin, circlips, rings, head gasket and base gasket.

• Upgrades to 180cc!
• Bore: 63mm
• Overall Height: 90.5mm 
• Cylinder Sleeve Outer Diameter: 64.9mm

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