Cylinder Piston Gasket Head End Kit for 660R YFM660R 2001-2005 660 YXR660 102MM This kit includes a cylinder, piston, gasket set, and head components designed for compatibility with specified models.The piston has a 102mm diameter and is engineered to fit the engine configuration of the listed vehicles.All parts are manufactured to match specifications for proper function and installation.The gasket set covers necessary seals for the end rebuild.This assembly is intended for use in engine maintenance or restoration projects involving the compatible model years.