Prox Racing Parts High Performance Steel Valve and Spring Kit for Intake - Upgrade Your Engine for Racing & Street Performance

Material: SteelReplaces the Factory valves & replacement valve springs. Steel, nitrided valves for increased durability and less wear under extreme conditions. Stronger replacement 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 rpm. Kit contains a set of steel intake or Replacement Exhaust Valves plus a set of specially designed replacement valve springs; can be installed using the Factory retainers, bases and replacement valve seals.2007-2008 fits KAW KX250F 2004-2006 fits SUZ RM-Z250