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Athena Big Bore Top End Gasket Kit 98mm Yamaha YFZ450R ATV/YFZ450X ATV Product Details Replacement top end gasket kit only for machines equipped with Athena Big Bore cylinder kit (sold separately) Does not fit stock engine Made in Italy NOTE: Only fits machines with Athena 480cc Big Bore Kit (sold separately). Fit GuideModelBig Bore Top End Gasket KitBore98mmCompression Ratio12.4:1Country of OriginItalyDisplacement480cc Product Fitment This item fits the following applications:Yamaha YFZ450R ATV...

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