Fits YAMAHA YZ65 2018-2025. Graded size 43.45 A. The clearance is to allow for piston expansion when it heats up. Vertex Piston Kit, Athena small end bearing and Mitaka top end gasket set. Vertex pistons are coated with a special Molybdenum Bisulphite black coating to aid during piston break in and reducing friction during the work inside the cylinder.
