Yamaha YZ450F 99mm Big Bore Full Engine Kit (2010–2017)

🏁 99mm Big Bore Full Engine Rebuild Kit – Yamaha YZ450F (2010–2017)

Ready to turn your YZ450F into a track weapon? This complete 99mm big bore engine kit is designed for max power, high-RPM reliability, and easy bolt-on installation. No machining required — just real gains from trusted performance parts.

✅ Fits all Yamaha YZ450F dirt bikes from 2010–2017

📦 Kit Includes:

• 99mm Cylinder – Big bore-ready, bolt-on fit

• CP Forged Big Bore Piston – Built to handle high RPM and heat

• High-Temp Piston Rings, Wrist Pin, Circlips

• Stage 2 Hotcams – Intake & Exhaust – More top-end power

• Kibblewhite Lightweight Valve Spring Kit

• Titanium Retainers + Heat-Treated Collars

• Kibblewhite Stainless Intake & Exhaust Valves

• Valve Stem Seals

• Hotrods Crankshaft Assembly with Rod

• Crank Bearings + Transmission Bearings + Shift Cam Bearings

• Water Pump Bearing

• OEM Oil Pump Assembly

• Timing Chain

• Stud Kit

• Clutch Kit – Fibers, steels, springs

• Complete Gasket Kit + Complete Seal Kit

• Stickers – Because this build deserves them

🔧 Key Features:

• Bolt-on installation – no machining required

• Runs on race gas only

• Ideal for racing, dune, and high-performance off-road use

• All parts are brand new in original packaging

• Covered by original manufacturer warranties

📦 Shipping Time:
This engine kit ships within 5–7 business days. You’ll get tracking info once shipped.

💬 Customer Support:
We’re here Monday–Friday, 7 AM to 4 PM PST, and our store chat runs 24/7 for quick support.