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Inner diameter of the cylinder: 47 mm, outer diameter of the piston pin: 13 mm Add cylinder, piston, piston rings, piston pins, piston pin clip, valve sealing ring, seals, clamping seal, exhaust seal, intake and exhaust studs, exhaust nut Easy installation with video instructions, you can visit the video on our Facebook homepage and YouTube. High performance upgrade 47 mm cylinder rebuild kit for GY6 49cc 50cc 60cc 80cc engine