Model Name: M587-A093 Material: Aluminum Engine Type: 2 stroke Displacement: 60cc Bore Size: 41mm Pin Diameter: 12mm This 41mm Cylinder Piston Gasket Kit is designed for Simson S51, SR50, KR51, and KR51/2 Schwalbe models with a 60cc engine.Constructed from aluminum, the kit includes a cylinder, piston, rings, pin, clips, and end gasket set.The 41mm bore and 12mm pin diameter are engineered to enhance engine performance, particularly in lower speed ranges, offering improved acceleration and responsiveness. Installation requires no modifications to the engine case, making it a straightforward upgrade.The components are built to fit precisely with the specified models.This kit serves as a practical solution for replacing worn or damaged parts such as seized pistons, blown cylinders, or low compression issues.It supports restoration or performance tuning of 2-stroke engines commonly found in Simson motorcycles and mopeds. Disclaimer: This part is produced by a third-party manufacturer.Brand/model mentions are for compatibility illustration only.