ProX Steel Exhaust Valve and Spring Kit 28.SES2440-1 — Yamaha YZ450F 2010-2013

Product Description

Replace your stock titanium exhaust valves with the superior durability of the ProX Steel Exhaust Valve and Spring Kit. Designed for riders who prioritize longevity and engine reliability, this kit uses nitrided steel valves that provide exceptional resistance to the extreme thermal stress found in the exhaust port of your Yamaha YZ450F. These steel valves are built to withstand heavy-duty use while maintaining consistent sealing over much longer service intervals than factory components.

Because steel valves carry more mass than titanium, this ProX kit includes specially calibrated valve springs manufactured from high-quality chrome vanadium steel. These springs ensure your valvetrain remains stable and performs reliably at high RPMs, preventing valve float and ensuring smooth power delivery. This complete kit is designed to work seamlessly with your existing OEM retainers, bases, and seals, offering a straightforward yet highly effective upgrade for your next cylinder head rebuild.

Top Features: ProX Steel Exhaust Valve and Spring Kit

• Nitrided steel valves offer significantly improved wear resistance and heat tolerance.
• Includes high-performance chrome vanadium springs tailored for steel valve weight.
• Engineered for stable high-RPM operation and reduced risk of valve failure.
• Direct-fit design compatible with OEM retainers, bases, and valve seals.
• The perfect solution for riders looking to increase engine service intervals.

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Why should I switch to steel exhaust valves?
A: Exhaust valves are the most thermally stressed component in your engine. Steel is far more resistant to "tuliping" and burning than titanium. If you aren't chasing the absolute peak weight savings for a professional racing application, steel is the smart choice for reliability.

Q: Do I need to replace my valve guides when using these?
A: We highly recommend checking your valve guides for wear. If they are loose, the extra mass of the steel valve will wear your valve seats much faster. If in doubt, replace the guides.

Expert Pro-Tip: When installing these valves, ensure you are using a quality assembly lube on the valve stems. Because these are steel-on-steel contact points with the valve guide, proper lubrication during the initial heat cycles is critical to preventing binding and ensuring a perfect seating transition.

Recommended Pairings:
o Yamaha YZ450F Performance Parts & Upgrades
o High-Temp Assembly Lube
o Cylinder Head Rebuild Tools

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