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.It includes a cylinder, piston, gaskets, and necessary hardware for installation.The cylinder bore measures 52.4mm, matching OEM specifications for compatibility with the 125cc engine platform.This part replaces number 12100-ARA-000 and is intended for engine rebuilding or performance restoration.Components are engineered to support standard displacement configurations and maintain proper compression when installed correctly.