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Athena Race Top End Gasket Kit #R4856-188 fits Yamaha YZ450F/WR450F/YZ450FX Product Details Specifically designed for the pro, semi-pro and amateur rider who freshens up their engine prior to a race or during mid season Kit includes a top of the line MLSS head gasket and 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 Made in Italy Fit GuideModel...

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