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NICHE MK1000939 Cylinder Head Valve Spring KitA brand new set of components to rebuild your cylinder head. This kit includes rocker arms, rocker arm shafts, valves, valve springs, valve spring retainers, valve spring seats, valve cotters, valve stem seals, o-rings, and wave washers. Quality and performance guaranteed!Compatible with (Replacment for) The Following Vehicles:end: For Yamaha Big Bear 400: 2000-2011For Yamaha Grizzly 350: 2007-2014For Yamaha Kodiak 400: 1993-2001For Yamaha Warrior 350: 1987-2004For Yamaha Wolverine 350: 1995-2009