Wingsmoto GY6 100cc Piston Rings Kit 50mm Big Bore Rings Set Moped Scooter 139QMB Go to amazon.com Related posts Top 50mm piston for 2022 FeaturePiston Rings Set fit 50mm Bore 100cc EnginePiston Diameter: 50mm50mm Big Bore DescriptionScooter Piston Rings Set fit 50mm Bore 100cc Engine. Piston Diameter: 50mm