GY6 125 & 150CC 59MM OVERSIZE PISTON KIT. MAKES THE 150CC SCOOTER A 160CC SCOOTER. EXCELLENT QUALITY KIT AND RACE PROVEN. INCLUDES PISTON, RINGS, CLIPS, PISTON PIN AND NECESSARY GASKETS.PISTON IS SLIGHTLY DOMED, 54 MM SPACING. DO NOT NEED CRANKCASE BORE TO ACCEPT THIS KIT. TAIWAN QUALITY