Features:
- Top End kit includes: piston, rings, wrist pin, clips, top end bearing, and gasket kit
- MOS2 (Teflon/Molybdenum) Coated Skirts - A rolled on application process provides a bond that is 10 times stronger than other spray on coatings. Benefits include increased heat transfer, reduced friction and helping to eliminate cold seizures
- Machined Smooth Heads - Reflects combustion heat and reduces carbon buildup, protecting the top of the piston. Some tests have shown this feature can increase horsepower and fuel economy by up to 6%
- Anodized Domes - Increases heat resistance and durability; pistons with anodized domes are 75% stronger than non-anodized pistons
- Hypereutectic Casting Process - Provides higher silicon content for reduced expansion rates and additional wear resistance; it also has an ability to withstand higher cylinder temperatures
Fitment:
1987 Yamaha YFM350ER Moto-4
1987 Yamaha YFM350FW Big Bear 4WD [SRA]
1987 Yamaha YFM350X Warrior
1988 Yamaha YFM350ER Moto-4
1988 Yamaha YFM350FW Big Bear 4WD [SRA]
1988 Yamaha YFM350X Warrior
1989 Yamaha YFM350ER Moto-4
1989 Yamaha YFM350FW Big Bear 4WD [SRA]
1989 Yamaha YFM350X Warrior
1990 Yamaha YFM350ER Moto-4
1990 Yamaha YFM350FW Big Bear 4WD [SRA]
1990 Yamaha YFM350X Warrior
1991 Yamaha YFM350ER Moto-4
1991 Yamaha YFM350FW Big Bear 4WD [SRA]
1991 Yamaha YFM350X Warrior
1992 Yamaha YFM350ER Moto-4
1992 Yamaha YFM350FW Big Bear 4WD [SRA]
1992 Yamaha YFM350X Warrior
1993 Yamaha YFM350ER Moto-4
1993 Yamaha YFM350FW Big Bear 4WD [SRA]
1993 Yamaha YFM350X Warrior
1994 Yamaha YFM350ER Moto-4
1994 Yamaha YFM350FW Big Bear 4WD [SRA]
1994 Yamaha YFM350X Warrior
1995 Yamaha YFM350ER Moto-4
1995 Yamaha YFM350FW Big Bear 4WD [SRA]
1995 Yamaha YFM350FX Wolverine 4WD [SRA]
1995 Yamaha YFM350X Warrior
1996 Yamaha YFM350FW Big Bear 4WD [SRA]
1996 Yamaha YFM350FX Wolverine 4WD [SRA]
1996 Yamaha YFM350U Big Bear 2WD [SRA]
1996 Yamaha YFM350X Warrior
1997 Yamaha YFM350FW Big Bear 4WD [SRA]
1997 Yamaha YFM350FX Wolverine 4WD [SRA]
1997 Yamaha YFM350U Big Bear 2WD [SRA]
1997 Yamaha YFM350X Warrior
1998 Yamaha YFM350FW Big Bear 4WD [SRA]
1998 Yamaha YFM350FX Wolverine 4WD [SRA]
1998 Yamaha YFM350U Big Bear 2WD [SRA]
1998 Yamaha YFM350X Warrior
1999 Yamaha YFM350FW Big Bear 4WD [SRA]
1999 Yamaha YFM350FX Wolverine 4WD [SRA]
1999 Yamaha YFM350U Big Bear 2WD [SRA]
1999 Yamaha YFM350X Warrior
2000 Yamaha YFM350FX Wolverine 4WD [SRA]
2000 Yamaha YFM350X Warrior
2001 Yamaha YFM350FX Wolverine 4WD [SRA]
2001 Yamaha YFM350X Warrior
2002 Yamaha YFM350FX Wolverine 4WD [SRA]
2002 Yamaha YFM350X Warrior
2003 Yamaha YFM350FX Wolverine 4WD [SRA]
2003 Yamaha YFM350X Warrior
2004 Yamaha YFM350BA Bruin 2WD [SRA]
2004 Yamaha YFM350FA Bruin 4WD [SRA]
2004 Yamaha YFM350FX Wolverine 4WD [SRA]
2004 Yamaha YFM350R Raptor
2004 Yamaha YFM350X Warrior
2005 Yamaha YFM350BA Bruin 2WD [SRA]
2005 Yamaha YFM350FA Bruin 4WD [SRA]
2005 Yamaha YFM350FX Wolverine 4WD [SRA]
2005 Yamaha YFM350R Raptor
2006 Yamaha YFM350BA Bruin 2WD [SRA]
2006 Yamaha YFM350FA Bruin 4WD [SRA]
2006 Yamaha YFM350R Raptor
2006 Yamaha YFM350X Wolverine 2WD [SRA]
2007 Yamaha YFM350FG Grizzly 4WD [SRA]
2007 Yamaha YFM350FGI Grizzly 4WD [IRS]
2007 Yamaha YFM350G Grizzly 2WD [SRA]
2007 Yamaha YFM350R Raptor
2007 Yamaha YFM350X Wolverine 2WD [SRA]
2008 Yamaha YFM350FG Grizzly 4WD [SRA]
2008 Yamaha YFM350FGI Grizzly 4WD [IRS]
2008 Yamaha YFM350G Grizzly 2WD [SRA]
2008 Yamaha YFM350R Raptor
2008 Yamaha YFM350X Wolverine 2WD [SRA]
2009 Yamaha YFM350FG Grizzly 4WD [SRA]
2009 Yamaha YFM350FGI Grizzly 4WD [IRS]
2009 Yamaha YFM350G Grizzly 2WD [SRA]
2009 Yamaha YFM350R Raptor
2009 Yamaha YFM350X Wolverine 2WD [SRA]
2010 Yamaha YFM350FG Grizzly 4WD [SRA]
2010 Yamaha YFM350FGI Grizzly 4WD [IRS]
2010 Yamaha YFM350G Grizzly 2WD [SRA]
2010 Yamaha YFM350R Raptor
2011 Yamaha YFM350FG Grizzly 4WD [SRA]
2011 Yamaha YFM350FGI Grizzly 4WD [IRS]
2011 Yamaha YFM350G Grizzly 2WD [SRA]
2011 Yamaha YFM350R Raptor
2012 Yamaha YFM350FG Grizzly 4WD [SRA]
2012 Yamaha YFM350FGI Grizzly 4WD [IRS]
2012 Yamaha YFM350G Grizzly 2WD [SRA]
2012 Yamaha YFM350R Raptor
2013 Yamaha YFM350FG Grizzly 4WD [SRA]
2013 Yamaha YFM350R Raptor
2014 Yamaha YFM350FG Grizzly 4WD [SRA]