Yamaha YZ450F & WR450F Big Bore Kit (2003–2006) – 98mm Performance Upgrade

SKU 255573587368

🔧 Big Bore Kit for Yamaha YZ450F & WR450F | Fits 2003–2006 Models

Unleash More Power with the 98mm Big Bore Kit for Yamaha YZ450F & WR450F!

Upgrade your Yamaha YZ450F or WR450F with this 98mm big bore kit, designed for riders who want to maximize engine performance without complicated modifications. This complete kit includes high-quality forged pistons from trusted brands like Wiseco, CP, JE, or Wossner, and everything you need for a seamless installation.

📦 What's Included:

• 98mm Big Bore Cylinder

• Wiseco, CP, JE, or Wossner forged big bore piston

• Nitrite-coated piston rings

• Chrome wristpin

• Circlips

• Top end gasket kit

• Cometic big bore MLS head gasket

• Timing chain

• Maxlock TITANIUM head stud kit with lifetime warranty

• Piston uses pump or race gas

• No modifications required for installation

💡 Key Features:

✅ Powerful Performance
The 98mm big bore cylinder and forged piston deliver a significant performance boost, increasing power and torque for a more thrilling ride.

✅ Durable & Reliable
With top-tier components like Wiseco, CP, JE, Wossner, and Maxlock TITANIUM head studs, this kit offers superior strength and durability that can withstand aggressive off-road riding.

✅ No Mods Required
This kit is a true bolt-on upgrade, requiring no modifications to your engine. Simply install and experience enhanced performance.

✅ Versatile Fuel Compatibility
The piston is designed to run on both pump gas and race gas, offering flexibility for different fuel preferences.

✅ Lifetime Warranty on Head Studs
Enjoy peace of mind with the lifetime warranty on the Maxlock TITANIUM head stud kit.

📦 Compatibility:
This kit is compatible with the following Yamaha models:

• 2003–2005 Yamaha YZ450F

• 2003–2006 Yamaha WR450F

🔧 Installation:
This big bore kit is easy to install, with no engine modifications required. However, we always recommend installation by a qualified mechanic to ensure everything is set up for optimal performance.

📦 Returns & Warranty Policy:
Warranty: 1-year limited warranty on all components (excluding improper installation, tuning, break-in, or misuse).
Returns: Please check your order carefully upon receipt. Returns are accepted within 30 days of purchase if the product is unused, unopened, and in its original packaging.

STUD WARRANTY: If the head stud fails during use, we will send you a replacement stud kit. Labor or other parts are not included.