Manufactured by
Kit includes piston, rings, pin, clips, top end gasket kit (you get exactly what is pictured)
Cast piston has super-high silicone content for additional strength
Piston skirts are Molybdenum 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)
gaskets use performance materials to increase durability and provide greater reliability
Includes all gaskets pictured to rebuild top end
Kit is for .020 over bore size – 71.50mm
Piston is 71.45mm
Compatible with Yamaha models below:
1992 Timberwolf 250 2×4 (YFB250)
1993 Timberwolf 250 2×4 (YFB250)
1994 Timberwolf 250 2×4 (YFB250)
1994 Timberwolf 250 4×4 (YFB250FW)
1995 Timberwolf 250 2×4 (YFB250)
1995 Timberwolf 250 4×4 (YFB250FW)
1996 Timberwolf 250 2×4 (YFB250)
1996 Timberwolf 250 4×4 (YFB250FW)
1997 Timberwolf 250 2×4 (YFB250)
1997 Timberwolf 250 4×4 (YFB250FW)
1998 Timberwolf 250 2×4 (YFB250)
1998 Timberwolf 250 4×4 (YFB250FW)
1999 Bear Tracker 250 (YFM250X)
1999 Timberwolf 250 4×4 (YFB250FW)
2000 Bear Tracker 250 (YFM250X)
2000 Timberwolf 250 4×4 (YFB250FW)
2001 Bear Tracker 250 (YFM250X)
2002 Bear Tracker 250 (YFM250X)
2003 Bear Tracker 250 (YFM250X)
2004 Bear Tracker 250 (YFM250X)
2005 Bruin 250 (YFM250B)
2006 Bruin 250 (YFM250B)
2007 Big Bear 250 (YFM250B)
2008 Big Bear 250 (YFM250B)
2009 Big Bear 250 (YFM250B)