Wiseco VIS028 Premium Stainless Steel Intake Valve Fits: Yamaha YFM350 Warrior 1987-2004, YFM350R Raptor 2005-2010, YFM350 Wolverine 1995-2008, YFM350 Bruin/Grizzly 2004-2010 Wiseco's stainless steel valves are made from premium materials and manufactured to the highest quality specifications A one-piece, forged construction offers high strength and fatigue properties Chromium nitride coating offering surface hardness and wear resistance Each design is a drop-in application and requires no piston or head modifications and will work with stock springs and valve-train