🛠️ Add amazing, reliable power to your YFZ450R or YFZ450X with this complete 98mm Big Bore Top End Kit. Designed for fuel-injected models, this package features a custom BPRATV Nikasil-plated cylinder and Wiseco Armor Glide piston—engineered for durability and serious performance on pump or race fuel.
BPRATV 98mm Big Bore Nikasil Plated Cylinder (1-Year Warranty)
Wiseco 98mm 12.75:1 Armor Glide Piston Kit (Piston, Rings, Wrist Pin, Circlips)
Cometic Big Bore Top End Gasket Kit
Kibblewhite Red Viton Valve Stem Seals (x5)
NGK Iridium Spark Plug
Fits: Yamaha YFZ450R & YFZ450X (Fuel Injected Models Only)
Years: 2009–2025
Cylinder: 1-Year Warranty against manufacturer defects
All Other Parts: Standard limited warranty against defects in materials/workmanship
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