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YFZ450R YFZ 450R Big Bore Kit 98mm Cylinder Stage 2 Cams Complete Top End Kit
FITS ALL YAMAHA YFZ450R AND YFZ450X FUEL INJECTED MODELS AND YEARS! Wiseco CP or JE forged piston. No modifications of any kind are required to use this kit. We strongly recommend that this be installed by a qualified mechanic with experience doing this type of work.