PROX Steel Exhaust Valve Conversion Kit - for: Yamaha YZ450F for WR450F

The ProX valve are made by the leading OEM factories in Japan and are a direct and cost-efficient OEM replacement. ProX steel valves can be used in combination with all the OEM valve train components like valve springs, guides, bases and retainers.

• Manufactured by the leading OEM factories in Japan
• Made to exact OEM specs and tolerances
• The steel valves are a direct and cost efficient OEM replacement