01-'13 for Yamaha WR250F PROX Intake Valve Conversion Set Ti-Steel Gas/Yam Aggressive riders will benefit from

Aggressive riders will benefit from the superior performance of these race proven discs

Option: Rear - 150/80-16

Provides smoother torque curves for more usable power

extending the life of the product

brackets and hardware

01-'13 for Yamaha WR250F PROX Intake Valve Conversion Set Ti-Steel Gas/Yam Aggressive riders will benefit fromManufacturer: Pro X MPN: 28. SIS2402 2 Title: Steel Valves and Spring Kits Option: Intake An alternative where the O. E. M. application uses expensive and less durable titanium valves These steel valves offer increased durability and easily extends the lifespan to 3x that of the O. E. M. titanium valves Nitrided valves offer high micro hardness while a super smooth surface finish reduces friction between stem and guide Special stronger valve springs