52mm Cylinder Piston Pin Ring Gasket Kit for 110cc ATVs Dirt Bikes Go Karts Quad 4 Wheeler Pit Bike Dune Buggys Cylinder Set Kit. Top Quality Guaranteed. It fits for most Chinese 110cc ATVs & Dirt Bikes and Go Karts Comes with Cylinder Body, Piston, Piston Rings, Piston Pin (all pieces in the picture are included) Bore Diameter: 52mm (other measurements please see pics for reference)