Chinese 47mm Piston Kit for ATVs, Scooters-Mopeds, Dirt-Bikes and Go Karts. This Chinese 47mm piston kit is the replacement part for many 4-stroke Chinese ATVs, Dirt Bikes, Go Karts and Scooters. Piston kits ship complete with piston, piston rings, piston pin and piston clips. This kit fits 70cc and 90cc models. Piston kit description: Piston Height: 41mm [1.61″] Piston Diameter: 47mm [1.85″] Piston Pin Length: 38mm [1.49″] Piston Pin Diameter: 13mm [.51″] Compatible with 70cc and 90cc 4 stroke