Motorcycle Engine Accessories Bore 57mm Cylinder Assembly includes a cylinder, piston, piston rings, and base gasket kit designed for use with GZ125 models.This assembly is engineered to replace worn or damaged engine components, providing a complete set for rebuilding the engine's core structure.The cylinder bore measures 57mm and is matched to a corresponding piston and ring set to proper fit and function.The included base gasket helps create a secure seal between the cylinder and crankcase.This kit is intended for motorcycles requiring a 57mm overbore upgrade or replacement of parts.