This motorcycle cylinder kit is designed for compatibility with YZ80 and YZ85 models.The set includes a cylinder block, piston, piston ring, piston pin, gasket, and connecting rod bearing to facilitate engine assembly or replacement.Constructed from aluminum, steel, rubber, and temperature-resistant paper materials, the components are engineered to match specifications.The cylinder block measures 47.5mm in bore by 81mm in stroke.The piston size is 47.5mm by 55mm, and the piston pin dimensions are 38mm by 14mm by 10mm.The compression ratio is 8.2:1.This kit serves as a functional replacement to restore standard engine.