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 Dome is not machine smoothed on this piston Kit is for .020 over bore size 71.50mm Piston is 71.45mm Made in Taiwan Fits 1992 Yamaha Timberwolf 250 2x4 YFB250 1993 Yamaha Timberwolf 250 2x4 YFB250 1994 Yamaha Timberwolf 250 2x4 YFB250 1994 Yamaha Timberwolf 250 4x4 YFB250FW 1995 Yamaha Timberwolf 250 2x4 YFB250 1995 Yamaha Timberwolf 250 4x4 YFB250FW 1996 Yamaha Timberwolf 250 2x4 YFB250 1996 Yamaha Timberwolf 250 4x4 YFB250FW 1997 Yamaha Timberwolf 250 2x4 YFB250 1997 Yamaha Timberwolf 250 4x4 YFB250FW 1998 Yamaha Timberwolf 250 2x4 YFB250 1998 Yamaha Timberwolf 250 4x4 YFB250FW 1999 Yamaha Bear Tracker 250 YFM250X 1999 Yamaha Timberwolf 250 4x4 YFB250FW 2000 Yamaha Bear Tracker 250 YFM250X 2000 Yamaha Timberwolf 250 4x4 YFB250FW 2001 Yamaha Bear Tracker 250 YFM250X 2002 Yamaha Bear Tracker 250 YFM250X 2003 Yamaha Bear Tracker 250 YFM250X 2004 Yamaha Bear Tracker 250 YFM250X 2005 Yamaha Bruin 250 YFM250B 2006 Yamaha Bruin 250 YFM250B 2007 Yamaha Big Bear 250 YFM250B 2008 Yamaha Big Bear 250 YFM250B 2009 Yamaha Big Bear 250 YFM250B