Manufactured by Namura Kit includes piston, rings, pin, clips you get exactly what is pictured Cast piston has super-high silicone content for additional strength Piston skirts are Molybdenium Teflon coated to minimize resistance/wear and provide extended life Piston dome is anodized for superior heat resistance and longer lifespan Kit is for standard bore size 83.00mm Piston is 82.95mm 9.2 1 Standard compression ratio Made in Taiwan Fits 1987 1999 Yamaha Big Bear 350 4x4 YFM350FW 1996 1999 Yamaha Big Bear 350 2x4 YFM350U 2004 2006 Yamaha Bruin 350 4x4 YFM350FA 2004 2006 Yamaha Bruin 350 2x4 YFM350A 2007 2011 Yamaha Grizzly 350 2x4 YFM350G 2007 2014 Yamaha Grizzly 350 4x4 YFM350FG 2007 2011 Yamaha Grizzly 350 4x4 IRS YFM350FGI 1987 1995 Yamaha Moto-4 350 YFM350ER 2004 2013 Yamaha Raptor 350 YFM350R 1987 2004 Yamaha Warrior 350 YFM350X 1995 2005 Yamaha Wolverine 350 4x4 YFM350FX 2006 2009 Yamaha Wolverine 350 2x4 YFM350X