ProX Exhaust Valve & Spring Kit – Yamaha YFZ450 / YFZ450R/X / WR450F / YZ450F | Gas Gas EC 450F

🛠️ Description
Extend the life of your Yamaha or Gas Gas engine with the ProX Exhaust Valve & Spring Kit. Featuring nitrided steel valves for reduced wear and premium chrome vanadium springs for reliable performance at high RPM, this kit is built to handle the demands of racing and aggressive riding. Designed as a direct OEM replacement, it installs easily using your stock retainers, bases, and valve seals.

✅ What’s Included

• Set of steel exhaust valves

• Set of exhaust valve springs

📦 Fitment

• 2009–2023 Yamaha YFZ450R / SE

• 2007–2008 Yamaha YFZ450 SE

• 2006–2007 Yamaha YFZ450 Bill Balance Edition

• 2006 Yamaha YFZ450 SE 4x2

• 2004–2009 Yamaha YFZ450 / YFZ450 X 4x2

• 2004–2005 Yamaha YFZ450 LE 4x2

• 2003–2015 Yamaha WR450F

• 2003–2009 Yamaha YZ450F

• 2013–2015 Gas Gas EC 450F

🛡️ Warranty Info
ProX valve kits are backed by a manufacturer’s limited warranty against defects in materials and workmanship. Warranty does not cover race damage, improper installation, or lack of maintenance.

🔑 Key Features

• Direct OEM replacement for exhaust valves and springs

• Nitrided steel valves for maximum durability under extreme conditions

• High-performance chrome vanadium springs for better RPM stability

• Designed to work with OEM retainers, bases, and valve seals

• Increased service life compared to stock components