PROX Steel Exhaust Valve and Spring Kit for Yamaha YZ/WR450F (2003-2009) - Part Number 28.SES2424-1

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 YZ or WR450F with the PROX Steel Exhaust Valve and Spring Kit, designed specifically for models from 2003 to 2009. This comprehensive kit includes high-quality components that ensure reliable performance and durability under demanding riding conditions. Crafted from premium steel, the exhaust valve offers enhanced strength and resistance to wear, helping to maintain optimal engine performance over time. The kit also features precision-engineered springs that provide consistent tension, promoting smooth valve operation and reducing the risk of failure during intense use.

Features:

• Complete kit includes steel exhaust valve and matching springs for a seamless upgrade

• Designed specifically for Yamaha YZ/WR450F models from 2003 to 2009

• Constructed from durable steel for increased strength and longevity

• Precision-engineered springs ensure reliable valve operation

• Easy installation with all necessary components included