41mm Engine Cylinder Barrel Piston Gasket Big Bore Kit 60cc For Simson S51 SR50 KR51 KR51/2 Schwalbe This cylinder piston gasket kit is designed for use when replacing a damaged cylinder, addressing issues such as low compression, cylinder blow-through, or piston seizure.The kit provides all necessary components for a complete -end rebuild. The set includes a 41mm bore cylinder with 60cc displacement, forged aluminum piston, piston ring set, 12mm steel wristpin, two circlips, cylinder base gasket, and cylinder head gasket.The increased bore diameter supports improved engine performance, particularly enhancing torque delivery in lower speed ranges. Made from aluminum, the cylinder does not require engine case boring during installation, making it compatible with existing engine configurations.This big bore kit serves as a direct replacement upgrade for parts on applicable models. Suitable for Simson mopeds and with 3 and 4 gear engines including: KR50 Schwalbe KR51 KR51/1 Schwalbe KR51/2 Schwalbe S50 S51 S51 S53 S53 SD50 Albatros SR50 Automatik (96-01) SR50 Engine type: 2 stroke Bore size: 41mm Pin diameter: 12mm Compatibility is based on model specifications.Users are advised to compare dimensions and design with their current components to confirm fitment. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.