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 to fit 660R YFM660R models from 2001 to 2005 as well as 660 YXR660 models.The piston has a 102mm diameter and is compatible with standard bore specifications.The gasket set covers all necessary seals for the end rebuild including valve cover, exhaust, and intake manifold gaskets.Components are engineered for precise fitment and performance in four-stroke engine applications.The kit supports complete end restoration and is intended for use in motorcycle engines requiring maintenance or repair.