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, piston rings, gaskets, and necessary hardware for installation.The cylinder has a bore diameter of 52.4mm and is engineered to replace the specification 12100-ARA-000.Suitable for 125cc engine rebuilds, this kit supports standard displacement and compression when installed correctly.Components are machined to meet dimensional tolerances for proper fitment and function within the engine assembly. This component is produced by an independent manufacturer.Brand names are used for compatibility illustration.