ATHENA Top-End Gasket Kit GAS GAS EC / YAMAHA WR / YFZ / YZ 450 07-17

Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during midseason

Kit includes a top-of-the line MLSS head gasket and two or more premium quality base gaskets of different thicknesses to optimize engine compression ratios

Gives the rider a choice of using standard gas with stock compression, or race gas with a higher compression

Kits do not include valve stem seals, rubber parts, shims, or other fiber gaskets

Kit does not include valve cover gaskets.
Fit the models: