Prox Stl Int Valve/Spring Crf250R/X04-7/04-9 28.SIS1336-2
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- Steel Valves for increased durability and less wear under extreme conditions
- Nitrided valves offer high microhardness while supersmooth surface finish reduces friction between stem and guide
- Special stronger valve springs deal with the extra weight of the steel valves
- Fully rebuildable with OEM retainers, bases and seals without the need of any further engine modifications
- Springs are made from premium chrome vanadium steel for higher performance and durability at high rpms
- Comes as complete package for quick, easy and cost efficient replacement