PROX Steel Intake Valve and Spring Kit for Yamaha YZ450F (2003-2009) and WR450F (2003-2011) | Part Number 28.SIS2424-2

Replaces the OEM valves & valve springs

Steel, nitrided valves for increased durability and less wear under extreme conditions

Stronger valve springs deal with the extra weight of the steel valves

Springs are made from premium chrome vanadium steel for higher performance and durability at high rpm

Kit contains a set of steel intake or exhaust valves plus a set of specially designed valve springs; can be installed using the OEM retainers, bases and valve seals

Upgrade your Yamaha motorcycle with the PROX Steel Intake Valve and Spring Kit, designed specifically for Yamaha YZ450F models from 2003 to 2009 and WR450F models from 2003 to 2011. This comprehensive kit ensures enhanced engine performance and reliable operation by replacing worn or damaged intake components. Crafted from durable steel, the intake valve provides excellent heat resistance and longevity, making it suitable for demanding riding conditions.
Included in this kit are high-quality springs engineered to maintain optimal tension and valve timing, which are critical for efficient combustion and power output. The kit is ideal for rebuilds, repairs, or performance upgrades, offering a perfect fit and easy installation to get your motorcycle back on the trail or track quickly.
Designed by PROX, a trusted name in motorcycle parts, this kit offers a cost-effective solution for maintaining or improving engine efficiency. Proper installation of these components can help restore the engine's original performance, improve throttle response, and extend the lifespan of your valve train. Whether you're a professional mechanic or an avid rider, this kit provides the necessary components to keep your Yamaha running at peak performance.

Features:

• Includes intake valve and spring for complete upgrade

• Made from durable steel for heat resistance and longevity

• Designed specifically for Yamaha YZ450F (2003-2009) and WR450F (2003-2011)

• Engineered to restore or improve engine performance

• Easy to install with a precise fit for reliable operation