Scooter Cylinder Kit For Symphony Sr 125 Orbit Jet 4 125cc 12100-ARA-000 52.4mm Engine Parts This cylinder kit is designed for use with Symphony Sr 125 and Orbit Jet 4 equipped with 125cc engines.It includes a cylinder, piston, piston rings, and gaskets, all sized to fit a 52.4mm bore.The components are engineered to restore engine performance and compression when replacing worn or damaged parts.This kit is compatible with models requiring part number 12100-ARA-000.Installation requires standard mechanical tools and knowledge of small engine assembly.Proper torque specifications and break-in procedures should be followed for. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.