PROX
PROX STEEL INTAKE VALVE/SPRING KIT YZ/WR450F 03-09/YFZ450 04-09 PART# 28.SIS2424
PROX STEEL INTAKE VALVE/SPRING KIT YZ/WR450F 03-09/YFZ450 04-09 PART# 28.SIS2424-2 NEW.
- Steel valves for increased durability and less wear under extreme conditions
- Nitrided valves offer high micro hardness while super smooth surface finish reduces friction between stem and guide
- Special 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 rpms
- Fully rebuild able with oem retainers bases and seals without the need of any further engine modifications
- Comes as complete package for quick easy and cost efficient replacement
