ProX 28.SIS4335-2 Engine Exhaust / Intake Valve Kit

ProX steel valve and spring kits offer increased durability and less wear under extreme conditions, easily lasting 3 times longer than the OEM titanium valves. Nitrided valves offer high microhardness while supersmooth surface finish reduces friction between stem and guide. Spring are made from premium chrome vanadium steel for higher performance and durability under high RPM. These 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. Fits: Suzuki RM-Z 250 2004-2006.