- Bore Diameter 83.50 mm
- Piston Diameter 83.45 mm
- Compression Ratio Actual 10.25:1
- Piston Material 2618
- Skirt Coating Yes
- Piston Oversize 0.50 mm
Fits:
| YAMAHA YFM 350 BRUIN 2WD [350] |
| YAMAHA |
YFM 350 BRUIN 2WD |
350 |
2006 |
|
| YAMAHA |
YFM 350 BRUIN 2WD |
350 |
2005 |
|
| YAMAHA |
YFM 350 BRUIN 2WD |
350 |
2004 |
|
| YAMAHA YFM 350 BRUIN 4WD [350] |
| YAMAHA |
YFM 350 BRUIN 4WD |
350 |
2006 |
|
| YAMAHA |
YFM 350 BRUIN 4WD |
350 |
2005 |
|
| YAMAHA |
YFM 350 BRUIN 4WD |
350 |
2004 |
|
| YAMAHA YFM 350 GRIZZLY 2WD [350] |
| YAMAHA |
YFM 350 GRIZZLY 2WD |
350 |
2014 |
|
| YAMAHA |
YFM 350 GRIZZLY 2WD |
350 |
2013 |
|
| YAMAHA |
YFM 350 GRIZZLY 2WD |
350 |
2012 |
|
| YAMAHA |
YFM 350 GRIZZLY 2WD |
350 |
2011 |
|
| YAMAHA |
YFM 350 GRIZZLY 2WD |
350 |
2010 |
|
| YAMAHA |
YFM 350 GRIZZLY 2WD |
350 |
2009 |
|
| YAMAHA |
YFM 350 GRIZZLY 2WD |
350 |
2008 |
|
| YAMAHA |
YFM 350 GRIZZLY 2WD |
350 |
2007 |
|
| YAMAHA YFM 350 GRIZZLY 4WD [350] |
| YAMAHA |
YFM 350 GRIZZLY 4WD |
350 |
2014 |
|
| YAMAHA |
YFM 350 GRIZZLY 4WD |
350 |
2013 |
|
| YAMAHA |
YFM 350 GRIZZLY 4WD |
350 |
2012 |
|
| YAMAHA |
YFM 350 GRIZZLY 4WD |
350 |
2011 |
|
| YAMAHA |
YFM 350 GRIZZLY 4WD |
350 |
2010 |
|
| YAMAHA |
YFM 350 GRIZZLY 4WD |
350 |
2009 |
| YAMAHA YFM 350 GRIZZLY 4WD [350] |
| YAMAHA |
YFM 350 GRIZZLY 4WD |
350 |
2008 |
|
| YAMAHA |
YFM 350 GRIZZLY 4WD |
350 |
2007 |
|
| YAMAHA YFM 350 GRIZZLY IRS 4WD [350] |
| YAMAHA |
YFM 350 GRIZZLY IRS 4WD |
350 |
2011 |
|
| YAMAHA |
YFM 350 GRIZZLY IRS 4WD |
350 |
2010 |
|
| YAMAHA |
YFM 350 GRIZZLY IRS 4WD |
350 |
2009 |
|
| YAMAHA |
YFM 350 GRIZZLY IRS 4WD |
350 |
2008 |
|
| YAMAHA |
YFM 350 GRIZZLY IRS 4WD |
350 |
2007 |
|
| YAMAHA YFM 350 RAPTOR 2WD [350] |
| YAMAHA |
YFM 350 RAPTOR 2WD |
350 |
2013 |
|
| YAMAHA |
YFM 350 RAPTOR 2WD |
350 |
2012 |
|
| YAMAHA |
YFM 350 RAPTOR 2WD |
350 |
2011 |
|
| YAMAHA |
YFM 350 RAPTOR 2WD |
350 |
2010 |
|
| YAMAHA |
YFM 350 RAPTOR 2WD |
350 |
2009 |
|
| YAMAHA |
YFM 350 RAPTOR 2WD |
350 |
2008 |
|
| YAMAHA |
YFM 350 RAPTOR 2WD |
350 |
2007 |
|
| YAMAHA |
YFM 350 RAPTOR 2WD |
350 |
2006 |
|
| YAMAHA |
YFM 350 RAPTOR 2WD |
350 |
2005 |
|
| YAMAHA YFM 350 WARRIOR 2WD [350] |
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
2004 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
2003 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
2002 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
2001 |
| YAMAHA YFM 350 WARRIOR 2WD [350] |
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
2000 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1999 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1998 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1997 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1996 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1995 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1994 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1993 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1992 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1991 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1990 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1989 |
|
| YAMAHA |
YFM 350 WARRIOR 2WD |
350 |
1988 |

Since 1940, Wiseco has manufactured forged pistons of outstanding quality for motorcycles, motocross bikes, snowmobiles, and 4-wheeler's. After almost 70 years in the industry, Wiseco has become synonymous with high-quality products that exceed the customer's requirements.
| Brand |
Model |
Year |
Name |
CC |
| YAMAHA |
YFM |
1988 |
Moto-4 |
350 |
| YAMAHA |
YFM |
1989 |
Moto-4 |
350 |
| YAMAHA |
YFM |
1990 |
Moto-4 |
350 |
| YAMAHA |
YFM |
1991 |
Moto-4 |
350 |
| YAMAHA |
YFM |
1992 |
Moto-4 |
350 |
| YAMAHA |
YFM |
1993 |
Moto-4 |
350 |
| YAMAHA |
YFM |
1994 |
Moto-4 |
350 |
| YAMAHA |
YFM |
1995 |
Moto-4 |
350 |
| YAMAHA |
YFM |
1988 |
Big Bear |
350 |
| YAMAHA |
YFM |
1989 |
Big Bear |
350 |
| YAMAHA |
YFM |
1990 |
Big Bear |
350 |
| YAMAHA |
YFM |
1991 |
Big Bear |
350 |
| YAMAHA |
YFM |
1992 |
Big Bear |
350 |
| YAMAHA |
YFM |
1992 |
Big Bear Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1993 |
Big Bear |
350 |
| YAMAHA |
YFM |
1993 |
Big Bear Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1994 |
Big Bear |
350 |
| YAMAHA |
YFM |
1994 |
Big Bear Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1995 |
Big Bear |
350 |
| YAMAHA |
YFM |
1995 |
Big Bear Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1996 |
Big Bear |
350 |
| YAMAHA |
YFM |
1996 |
Big Bear Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1996 |
Big Bear |
350 |
| YAMAHA |
YFM |
1996 |
Big Bear Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1997 |
Big Bear |
350 |
| YAMAHA |
YFM |
1997 |
Big Bear Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1997 |
Big Bear |
350 |
| YAMAHA |
YFM |
1997 |
Big Bear Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1997 |
Big Bear |
350 |
| YAMAHA |
YFM |
1997 |
Big Bear Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1998 |
Big Bear |
350 |
| YAMAHA |
YFM |
1998 |
Big Bear |
350 |
| YAMAHA |
YFM |
1999 |
Big Bear |
350 |
| YAMAHA |
YFM |
1999 |
Big Bear Hunter |
350 |
| YAMAHA |
YFM |
1999 |
Big Bear |
350 |
| YAMAHA |
YFM |
1999 |
Big Bear |
350 |
| YAMAHA |
YFM |
2008 |
Grizzly |
350 |
| YAMAHA |
YFM |
2008 |
Grizzly Hunter |
350 |
| YAMAHA |
YFM |
2008 |
Grizzly IRS |
350 |
| YAMAHA |
YFM |
2008 |
Grizzly IRS Hunter |
350 |
| YAMAHA |
YFM |
2009 |
Grizzly |
350 |
| YAMAHA |
YFM |
2009 |
Grizzly |
350 |
| YAMAHA |
YFM |
2009 |
Grizzly Hunter |
350 |
| YAMAHA |
YFM |
2009 |
Grizzly IRS Hunter |
350 |
| YAMAHA |
YFM |
2010 |
Grizzly |
350 |
| YAMAHA |
YFM |
2010 |
Grizzly |
350 |
| YAMAHA |
YFM |
2010 |
Grizzly Hunter |
350 |
| YAMAHA |
YFM |
2010 |
Grizzly IRS |
350 |
| YAMAHA |
YFM |
2010 |
Grizzly IRS Hunter |
350 |
| YAMAHA |
YFM |
1988 |
Warrior |
350 |
| YAMAHA |
YFM |
1989 |
Warrior |
350 |
| YAMAHA |
YFM |
1990 |
Warrior |
350 |
| YAMAHA |
YFM |
1991 |
Warrior |
350 |
| YAMAHA |
YFM |
1991 |
Warrior Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1992 |
Warrior |
350 |
| YAMAHA |
YFM |
1992 |
Warrior Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1993 |
Warrior |
350 |
| YAMAHA |
YFM |
1993 |
Warrior Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1994 |
Warrior |
350 |
| YAMAHA |
YFM |
1994 |
Warrior Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1995 |
Warrior |
350 |
| YAMAHA |
YFM |
1995 |
Warrior Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1996 |
Warrior |
350 |
| YAMAHA |
YFM |
1996 |
Warrior Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1997 |
Warrior |
350 |
| YAMAHA |
YFM |
1997 |
Warrior Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1998 |
Warrior |
350 |
| YAMAHA |
YFM |
1999 |
Warrior |
350 |
| YAMAHA |
YFM |
2000 |
Warrior |
350 |
| YAMAHA |
YFM |
2001 |
Warrior |
350 |
| YAMAHA |
YFM |
2002 |
Warrior |
350 |
| YAMAHA |
YFM |
2003 |
Warrior |
350 |
| YAMAHA |
YFM |
2004 |
Warrior |
350 |
| YAMAHA |
YFM |
1995 |
Wolverine |
350 |
| YAMAHA |
YFM |
1995 |
Wolverine Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1996 |
Wolverine |
350 |
| YAMAHA |
YFM |
1996 |
Wolverine Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1997 |
Wolverine |
350 |
| YAMAHA |
YFM |
1997 |
Wolverine Maine & New Hampshire |
350 |
| YAMAHA |
YFM |
1998 |
Wolverine |
350 |
| YAMAHA |
YFM |
1999 |
Wolverine |
350 |
| YAMAHA |
YFM |
2000 |
Wolverine |
350 |
| YAMAHA |
YFM |
2001 |
Wolverine |
350 |
| YAMAHA |
YFM |
2002 |
Wolverine |
350 |
| YAMAHA |
YFM |
2003 |
Wolverine |
350 |
| YAMAHA |
YFM |
2004 |
Wolverine |
350 |
| YAMAHA |
YFM |
2005 |
Wolverine |
350 |
| YAMAHA |
YFM |
2005 |
Wolverine Sport |
350 |
| YAMAHA |
YFM |
2006 |
Wolverine Sport |
350 |
| YAMAHA |
YFM |
2007 |
Wolverine Sport |
350 |
| YAMAHA |
YFM |
2008 |
Wolverine Sport |
350 |
| YAMAHA |
YFM |
2009 |
Wolverine Sport |
350 |
| YAMAHA |
YFM |
2004 |
Bruin |
350 |
| YAMAHA |
YFM |
2004 |
Bruin |
350 |
| YAMAHA |
YFM |
2004 |
Bruin Hardwood Camo |
350 |
| YAMAHA |
YFM |
2005 |
Bruin |
350 |
| YAMAHA |
YFM |
2005 |
Bruin |
350 |
| YAMAHA |
YFM |
2005 |
Bruin Hunter |
350 |
| YAMAHA |
YFM |
2006 |
Bruin |
350 |
| YAMAHA |
YFM |
2006 |
Bruin |
350 |
| YAMAHA |
YFM |
2006 |
Bruin Hunter |
350 |
| YAMAHA |
YFM |
2004 |
Raptor |
350 |
| YAMAHA |
YFM |
2005 |
Raptor |
350 |
| YAMAHA |
YFM |
2005 |
Raptor SE |
350 |
| YAMAHA |
YFM |
2006 |
Raptor |
350 |
| YAMAHA |
YFM |
2006 |
Raptor SE |
350 |
| YAMAHA |
YFM |
2007 |
Raptor |
350 |
| YAMAHA |
YFM |
2007 |
Raptor SE |
350 |
| YAMAHA |
YFM |
2007 |
Raptor SE2 |
350 |
| YAMAHA |
YFM |
2008 |
Raptor |
350 |
| YAMAHA |
YFM |
2009 |
Raptor |
350 |
| YAMAHA |
YFM |
2010 |
Raptor |
350 |
| YAMAHA |
YFM |
2008 |
Grizzly |
350 |
| YAMAHA |
YFM |
2007 |
Grizzly |
350 |
| YAMAHA |
YFM |
2007 |
Grizzly |
350 |
| YAMAHA |
YFM |
2007 |
Grizzly IRS Hunter |
350 |
| YAMAHA |
YFM |
2007 |
Grizzly IRS |
350 |
| YAMAHA |
YFM |
2011 |
Grizzly |
350 |
| YAMAHA |
YFM |
2011 |
Grizzly IRS |
350 |
| YAMAHA |
YFM |
2011 |
Grizzly |
350 |
| YAMAHA |
YFM |
2011 |
Grizzly Hunter |
350 |
| YAMAHA |
YFM |
2011 |
Grizzly IRS Hunter |
350 |
| YAMAHA |
YFM |
2011 |
Raptor |
350 |
| YAMAHA |
YFM |
2012 |
Raptor |
350 |
| YAMAHA |
YFM |
2012 |
Grizzly |
350 |
| YAMAHA |
YFM |
2012 |
Grizzly Hunter |
350 |
| YAMAHA |
YFM |
2012 |
Grizzly |
350 |
| YAMAHA |
YFM |
2012 |
|
350 |
| YAMAHA |
YFM |
2004 |
Bruin |
350 |
| YAMAHA |
YFM |
2005 |
Bruin |
350 |
| YAMAHA |
YFM |
2006 |
Bruin |
350 |
| YAMAHA |
YFM |
2004 |
Bruin |
350 |
| YAMAHA |
YFM |
2005 |
Bruin |
350 |
| YAMAHA |
YFM |
2006 |
Bruin |
350 |
| YAMAHA |
YFM |
2013 |
Grizzly |
350 |
| YAMAHA |
YFM |
2013 |
Grizzly Hunter |
350 |
| YAMAHA |
YFM |
2013 |
Raptor |
350 |
| YAMAHA |
YFM |
2013 |
Grizzly |
350 |
| YAMAHA |
YFM |
2013 |
|
350 |
| YAMAHA |
YFM |
2014 |
Grizzly |
350 |
| YAMAHA |
YFM |
2014 |
Grizzly Hunter |
350 |
| YAMAHA |
YFM |
2014 |
Grizzly |
350 |
| YAMAHA |
YFM |
2014 |
Grizzly |
350 |
| YAMAHA |
YFM |
2009 |
Grizzly IRS |
350 |