Yamaha YFZ450R/X Big Bore 98mm Engine Rebuild Kit – EFI Models

SKU: 265244929328
FITS ALL YAMAHA YFZ450R & YFZ450X FUEL-INJECTED MODELS AND YEARS

Looking to rebuild and upgrade your YFZ450R or YFZ450X engine? This complete 98mm performance rebuild kit is engineered for serious riders and racers. With top-tier components, this kit boosts power and reliability without needing case mods.

✅ Kit Includes:

• 98mm BPR Big Bore Cylinder

• Wiseco, JE, or CP forged hi-compression piston

• High-temperature piston rings

• Chrome wristpin and circlips

• Hotrods or Wiseco crankshaft with connecting rod

• Clutch kit (Fibers, Steels, Springs – for 2009–2014 models)

• Main bearings

• Counter balancer bearings

• Transmission bearings

• Shift cam bearing

• Water pump bearing

• Mechanical seal

• Complete top & bottom end gasket kit

• MLS big bore head gasket

• Complete crankcase oil seal kit

• Valve stem seals

• Heavy-duty cam chain

• Heavy-duty head stud kit

🔧 Built for:

• EFI (fuel-injected) YFZ450R and YFZ450X models

• Stock or modified head setups

• Pump or race gas compatible

• No machining required

📦 Handling Time:

Ships in 5–7 business days (due to hand-packing by our small team of parts experts).

🛡️ Warranty & Returns

• 1-Year Limited Warranty (must be installed by a qualified mechanic)

• Returns accepted within 30 days on new, unused items in original packaging

• Buyer responsible for return shipping on eligible returns

• Warranty does not cover installation errors, tuning issues, or misuse