Cylinder Piston Gasket Head End Kit for 660R YFM660R 2001-2005 660 YXR660 102MM This kit includes a cylinder, piston, gasket set, and related components designed to fit 660R YFM660R models from 2001 to 2005 as well as 660 YXR660 models.The piston has a diameter of 102mm, matching specifications for proper engine fitment.The gasket set contains all necessary seals for installation.This end kit is intended for use in engine rebuilds or performance where replacement of the end components is required.All parts are manufactured to meet standard dimensional tolerances for compatibility with applicable models.