This piston kit is compatible with CG125, XL125, CB125S, and CB125J motorcycles.It features a 56.5 mm piston diameter and a 15 mm piston pin.The kit is designed to fit models including CB125J (England), CB125S (1976, 1978, and 1979 Z model for USA), CG125 (1980 A model for Singapore, 1981 B model for England, General Export, and CG125K1 England), and XL125 (1976 and 1977 USA).It corresponds to OEM part number 13101-383-010.