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Top End & Piston 72.45/+1.50 11:1 Yamaha YFM250B Big Bear [SRA] YFM250B Bruin 2WD [SRA] YFM250X Bear Tracker 2WD [SRA] YFB250FW Timberwolf 4WD [SRA] YFB250 Timberwolf 2WD [SRA] 1992-2009
Top End & Piston 70.95/STD 11:1 Yamaha YFM250B Big Bear [SRA] YFM250B Bruin 2WD [SRA] YFM250X Bear Tracker 2WD [SRA] YFB250FW Timberwolf 4WD [SRA] YFB250 Timberwolf 2WD [SRA] 1992-2009
Top End & Piston HYPERDRYVE 101.97/STD Yamaha YXM700 Viking YFM700G Grizzly Fi 4WD [IRS] YFM700R Raptor 2014-2018
Top End & Piston 101.99/+0.02 9.2:1 Yamaha YFM700G Grizzly Fi 4WD [IRS] YFM700R Raptor YXR700F Rhino 700 2006-2016
Top End & Piston 101.98/+0.01 9.2:1 Yamaha YFM700G Grizzly Fi 4WD [IRS] YFM700R Raptor YXR700F Rhino 700 2006-2016
Top End & Piston 85.45/+1.00 11:1 Yamaha YFM450FGP Grizzly 4WD EPS [IRS] YXR450F Rhino 450 YFM450FG Grizzly 4WD [IRS] YFM450FA Kodiak 4WD [IRS] YFM450FX Wolverine 4WD [SRA] 2003-2014
Top End & Piston 84.95/+0.50 11:1 Yamaha YFM450FGP Grizzly 4WD EPS [IRS] YXR450F Rhino 450 YFM450FG Grizzly 4WD [IRS] YFM450FA Kodiak 4WD [IRS] YFM450FX Wolverine 4WD [SRA] 2003-2014
Top End & Piston 84.45/STD 11:1 Yamaha YFM450FGP Grizzly 4WD EPS [IRS] YXR450F Rhino 450 YFM450FG Grizzly 4WD [IRS] YFM450FA Kodiak 4WD [IRS] YFM450FX Wolverine 4WD [SRA] 2003-2014
Top End & Piston 101.47/+1.50 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008
Top End & Piston 100.97/+1.00 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008
Top End & Piston 100.47/+0.50 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008
PISTON RINGS 94.95MM GAS/ FOR NAMURA PISTONS ONLY Gas-Gas Yamaha EC 450F YZ450F WR450F 2003-2015
Top End & Piston HYPERDRYVE 94.96/+0.01 11.4:1 Yamaha YFZ450 2004-2013
Top End & Piston 85.42/+1.00 11:1 Yamaha YFM400FG Grizzly 4WD [IRS] YFM400FA Kodiak 4WD [SRA] YFM400A Kodiak 2WD [SRA] 2000-2008
Top End & Piston 84.92/+0.50 11:1 Yamaha YFM400FG Grizzly 4WD [IRS] YFM400FA Kodiak 4WD [SRA] YFM400A Kodiak 2WD [SRA] 2000-2008
Top End & Piston 84.42/STD 11:1 Yamaha YFM400FG Grizzly 4WD [IRS] YFM400FA Kodiak 4WD [SRA] YFM400A Kodiak 2WD [SRA] 2000-2008
PISTON RINGS 95MM FOR NAMURA PISTONS ONLY Yamaha XT600 TT600 1984-1995
Top End & Piston 96/+1.00 11:1 Yamaha XT600 YFM600FG Grizzly 4WD [SRA] 1984-2001
Top End & Piston 95.5/+0.50 11:1 Yamaha XT600 YFM600FG Grizzly 4WD [SRA] 1984-2001
Top End & Piston 95/STD 11:1 Yamaha XT600 YFM600FG Grizzly 4WD [SRA] 1984-2001
Top End & Piston 84/+1.00 11:1 Yamaha YFM400FB Big Bear 4WD [SRA] YFM400FA Kodiak 4WD [SRA] YFM400 Big Bear 2WD [SRA] YFM400FBI Big Bear 4WD [IRS] 1993-2010
Top End & Piston 83.5/+0.50 11:1 Yamaha YFM400FB Big Bear 4WD [SRA] YFM400FA Kodiak 4WD [SRA] YFM400 Big Bear 2WD [SRA] YFM400FBI Big Bear 4WD [IRS] 1993-2010
Top End & Piston 83/STD 11:1 Yamaha YFM400FB Big Bear 4WD [SRA] YFM400FA Kodiak 4WD [SRA] YFM400 Big Bear 2WD [SRA] YFM400FBI Big Bear 4WD [IRS] 1993-2010
PISTON RINGS 82.95MM FOR NAMURA PISTONS ONLY Yamaha Bw350 1987-1988
Top End & Piston 84.45/+1.50 11:1 Yamaha YFM350X Wolverine 2WD [SRA] YFM350FG Grizzly 4WD [SRA] YFM350G Grizzly 2WD [SRA] YFM350BA Bruin 2WD [SRA] YFM350FA Bruin 4WD [SRA] YFM350FX Wolverine 4WD [SRA] YFM350FGI Grizzly 4WD [IRS] YFM350X Warrior YFM350FW Big Bear 4WD [SRA] YFM350R Raptor YFM350U Big Bear 2WD [SRA] YFM350ER Moto-4 1987-2014
PISTON RINGS 83.95MM FOR NAMURA PISTONS ONLY Yamaha Bw350 1987-1988
Top End & Piston 83.95/+1.00 11:1 Yamaha YFM350X Wolverine 2WD [SRA] YFM350FG Grizzly 4WD [SRA] YFM350G Grizzly 2WD [SRA] YFM350BA Bruin 2WD [SRA] YFM350FA Bruin 4WD [SRA] YFM350FX Wolverine 4WD [SRA] YFM350FGI Grizzly 4WD [IRS] YFM350X Warrior YFM350FW Big Bear 4WD [SRA] YFM350R Raptor YFM350U Big Bear 2WD [SRA] YFM350ER Moto-4 1987-2014
PISTON RINGS 83.45MM FOR NAMURA PISTONS ONLY Yamaha Bw350 1987-1988
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STICKER![NAMURA Top End & Piston 72.45/+1.50 11:1 Yamaha YFM250B Big Bear [SRA] YFM250B Bruin 2WD [SRA] YFM250X Bear Tracker 2WD [SRA] YFB250FW Timberwolf 4WD [SRA] YFB250 Timberwolf 2WD [SRA] 1992-2009 Yamaha YFM250B Big Bear [SRA] 2007-2009 Yamaha YFM250B Bruin 2WD [SRA] 2005-2006 Yamaha YFM250X Bear Tracker 2WD [SRA] 1999-2004 Yamaha YFB250FW Timberwolf 4WD [SRA] 1994-2000 Yamaha YFB250 Timberwolf 2WD [SRA] 1992-1998. MPN: NA-40015-6K. SKU: 186-40156.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_7245__150_11_1_yam_186_40156_1-1-500x500.jpg)
![NAMURA Top End & Piston 70.95/STD 11:1 Yamaha YFM250B Big Bear [SRA] YFM250B Bruin 2WD [SRA] YFM250X Bear Tracker 2WD [SRA] YFB250FW Timberwolf 4WD [SRA] YFB250 Timberwolf 2WD [SRA] 1992-2009 Yamaha YFM250B Big Bear [SRA] 2007-2009 Yamaha YFM250B Bruin 2WD [SRA] 2005-2006 Yamaha YFM250X Bear Tracker 2WD [SRA] 1999-2004 Yamaha YFB250FW Timberwolf 4WD [SRA] 1994-2000 Yamaha YFB250 Timberwolf 2WD [SRA] 1992-1998. MPN: NA-40015K. SKU: 186-4015.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_7095_std_11_1_yam_186_4015_1-1-500x500.jpg)
![NAMURA Top End & Piston HYPERDRYVE 101.97/STD Yamaha YXM700 Viking YFM700G Grizzly Fi 4WD [IRS] YFM700R Raptor 2014-2018 Yamaha YXM700 Viking 2014-2018 Yamaha YFM700G Grizzly Fi 4WD [IRS] 2014-2015 Yamaha YFM700R Raptor 2015-2018. MPN: NA-40013K. SKU: 186-4013.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_hyperdryve_10197_std_yam_186_4013_1-1-500x500.jpg)
![NAMURA Top End & Piston 101.99/+0.02 9.2:1 Yamaha YFM700G Grizzly Fi 4WD [IRS] YFM700R Raptor YXR700F Rhino 700 2006-2016 Yamaha YFM700G Grizzly Fi 4WD [IRS] 2007-2013 Yamaha YFM700R Raptor 2006-2016 Yamaha YXR700F Rhino 700 2008-2013. MPN: NA-40012-CK. SKU: 186-4012C.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_10199__002_92_1_yam_186_4012c_1-1-500x500.jpg)
![NAMURA Top End & Piston 101.98/+0.01 9.2:1 Yamaha YFM700G Grizzly Fi 4WD [IRS] YFM700R Raptor YXR700F Rhino 700 2006-2016 Yamaha YFM700G Grizzly Fi 4WD [IRS] 2007-2013 Yamaha YFM700R Raptor 2006-2016 Yamaha YXR700F Rhino 700 2008-2013. MPN: NA-40012-BK. SKU: 186-4012B.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_10198__001_92_1_yam_186_4012b_1-1-500x500.jpg)
![NAMURA Top End & Piston 85.45/+1.00 11:1 Yamaha YFM450FGP Grizzly 4WD EPS [IRS] YXR450F Rhino 450 YFM450FG Grizzly 4WD [IRS] YFM450FA Kodiak 4WD [IRS] YFM450FX Wolverine 4WD [SRA] 2003-2014 Yamaha YFM450FGP Grizzly 4WD EPS [IRS] 2011-2014 Yamaha YXR450F Rhino 450 2006-2009 Yamaha YFM450FG Grizzly 4WD [IRS] 2007-2014 Yamaha YFM450FA Kodiak 4WD [IRS] 2003-2006 Yamaha YFM450FX Wolverine 4WD [SRA] 2006-2010. MPN: NA-40011-4K. SKU: 186-40114.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8545__100_11_1_yam_186_40114_1-1-500x500.jpg)
![NAMURA Top End & Piston 84.95/+0.50 11:1 Yamaha YFM450FGP Grizzly 4WD EPS [IRS] YXR450F Rhino 450 YFM450FG Grizzly 4WD [IRS] YFM450FA Kodiak 4WD [IRS] YFM450FX Wolverine 4WD [SRA] 2003-2014 Yamaha YFM450FGP Grizzly 4WD EPS [IRS] 2011-2014 Yamaha YXR450F Rhino 450 2006-2009 Yamaha YFM450FG Grizzly 4WD [IRS] 2007-2014 Yamaha YFM450FA Kodiak 4WD [IRS] 2003-2006 Yamaha YFM450FX Wolverine 4WD [SRA] 2006-2010. MPN: NA-40011-2K. SKU: 186-40112.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8495__050_11_1_yam_186_40112_1-1-500x500.jpg)
![NAMURA Top End & Piston 84.45/STD 11:1 Yamaha YFM450FGP Grizzly 4WD EPS [IRS] YXR450F Rhino 450 YFM450FG Grizzly 4WD [IRS] YFM450FA Kodiak 4WD [IRS] YFM450FX Wolverine 4WD [SRA] 2003-2014 Yamaha YFM450FGP Grizzly 4WD EPS [IRS] 2011-2014 Yamaha YXR450F Rhino 450 2006-2009 Yamaha YFM450FG Grizzly 4WD [IRS] 2007-2014 Yamaha YFM450FA Kodiak 4WD [IRS] 2003-2006 Yamaha YFM450FX Wolverine 4WD [SRA] 2006-2010. MPN: NA-40011K. SKU: 186-4011.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8445_std_11_1_yam_186_4011_1-1-500x500.jpg)
![NAMURA Top End & Piston 101.47/+1.50 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008 Yamaha YFM660FG Grizzly 4WD [IRS] 2002-2008 Yamaha YXR660F Rhino 660 2004-2007. MPN: NA-40010-6K. SKU: 186-40106.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_10147__150_11_1_yam_186_40106_1-1-500x500.jpg)
![NAMURA Top End & Piston 100.97/+1.00 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008 Yamaha YFM660FG Grizzly 4WD [IRS] 2002-2008 Yamaha YXR660F Rhino 660 2004-2007. MPN: NA-40010-4K. SKU: 186-40104.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_10097__100_11_1_yam_186_40104_1-1-500x500.jpg)
![NAMURA Top End & Piston 100.47/+0.50 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008 Yamaha YFM660FG Grizzly 4WD [IRS] 2002-2008 Yamaha YXR660F Rhino 660 2004-2007. MPN: NA-40010-2K. SKU: 186-40102.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_10047__050_11_1_yam_186_40102_1-1-500x500.jpg)
![NAMURA Top End & Piston 85.42/+1.00 11:1 Yamaha YFM400FG Grizzly 4WD [IRS] YFM400FA Kodiak 4WD [SRA] YFM400A Kodiak 2WD [SRA] 2000-2008 Yamaha YFM400FG Grizzly 4WD [IRS] 2007-2008 Yamaha YFM400FA Kodiak 4WD [SRA] 2000-2006 Yamaha YFM400A Kodiak 2WD [SRA] 2000-2004. MPN: NA-40008-4K. SKU: 186-40084.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8542__100_11_1_yam_186_40084_1-1-500x500.jpg)
![NAMURA Top End & Piston 84.92/+0.50 11:1 Yamaha YFM400FG Grizzly 4WD [IRS] YFM400FA Kodiak 4WD [SRA] YFM400A Kodiak 2WD [SRA] 2000-2008 Yamaha YFM400FG Grizzly 4WD [IRS] 2007-2008 Yamaha YFM400FA Kodiak 4WD [SRA] 2000-2006 Yamaha YFM400A Kodiak 2WD [SRA] 2000-2004. MPN: NA-40008-2K. SKU: 186-40082.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8492__050_11_1_yam_186_40082_1-1-500x500.jpg)
![NAMURA Top End & Piston 84.42/STD 11:1 Yamaha YFM400FG Grizzly 4WD [IRS] YFM400FA Kodiak 4WD [SRA] YFM400A Kodiak 2WD [SRA] 2000-2008 Yamaha YFM400FG Grizzly 4WD [IRS] 2007-2008 Yamaha YFM400FA Kodiak 4WD [SRA] 2000-2006 Yamaha YFM400A Kodiak 2WD [SRA] 2000-2004. MPN: NA-40008K. SKU: 186-4008.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8442_std_11_1_yam_186_4008_1-1-500x500.jpg)
![NAMURA Top End & Piston 96/+1.00 11:1 Yamaha XT600 YFM600FG Grizzly 4WD [SRA] 1984-2001 Yamaha XT600 1984-1995 Yamaha YFM600FG Grizzly 4WD [SRA] 1998-2001. MPN: NA-40007-4K. SKU: 186-40074.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_96__100_11_1_yam_186_40074_1-1-500x500.jpg)
![NAMURA Top End & Piston 95.5/+0.50 11:1 Yamaha XT600 YFM600FG Grizzly 4WD [SRA] 1984-2001 Yamaha XT600 1984-1995 Yamaha YFM600FG Grizzly 4WD [SRA] 1998-2001. MPN: NA-40007-2K. SKU: 186-40072.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_955__050_11_1_yam_186_40072_1-1-500x500.jpg)
![NAMURA Top End & Piston 95/STD 11:1 Yamaha XT600 YFM600FG Grizzly 4WD [SRA] 1984-2001 Yamaha XT600 1984-1995 Yamaha YFM600FG Grizzly 4WD [SRA] 1998-2001. MPN: NA-40007K. SKU: 186-4007.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_95_std_11_1_yam_186_4007_1-1-500x500.jpg)
![NAMURA Top End & Piston 84/+1.00 11:1 Yamaha YFM400FB Big Bear 4WD [SRA] YFM400FA Kodiak 4WD [SRA] YFM400 Big Bear 2WD [SRA] YFM400FBI Big Bear 4WD [IRS] 1993-2010 Yamaha YFM400FB Big Bear 4WD [SRA] 2000-2006 Yamaha YFM400FA Kodiak 4WD [SRA] 1993-1999 Yamaha YFM400 Big Bear 2WD [SRA] 2000-2004 Yamaha YFM400FBI Big Bear 4WD [IRS] 2007-2010. MPN: NA-40006-4K. SKU: 186-40064.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_84__100_11_1_yam_186_40064_1-1-500x500.jpg)
![NAMURA Top End & Piston 83.5/+0.50 11:1 Yamaha YFM400FB Big Bear 4WD [SRA] YFM400FA Kodiak 4WD [SRA] YFM400 Big Bear 2WD [SRA] YFM400FBI Big Bear 4WD [IRS] 1993-2010 Yamaha YFM400FB Big Bear 4WD [SRA] 2000-2006 Yamaha YFM400FA Kodiak 4WD [SRA] 1993-1999 Yamaha YFM400 Big Bear 2WD [SRA] 2000-2004 Yamaha YFM400FBI Big Bear 4WD [IRS] 2007-2010. MPN: NA-40006-2K. SKU: 186-40062.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_835__050_11_1_yam_186_40062_1-1-500x500.jpg)
![NAMURA Top End & Piston 83/STD 11:1 Yamaha YFM400FB Big Bear 4WD [SRA] YFM400FA Kodiak 4WD [SRA] YFM400 Big Bear 2WD [SRA] YFM400FBI Big Bear 4WD [IRS] 1993-2010 Yamaha YFM400FB Big Bear 4WD [SRA] 2000-2006 Yamaha YFM400FA Kodiak 4WD [SRA] 1993-1999 Yamaha YFM400 Big Bear 2WD [SRA] 2000-2004 Yamaha YFM400FBI Big Bear 4WD [IRS] 2007-2010. MPN: NA-40006K. SKU: 186-4006.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_83_std_11_1_yam_186_4006_1-1-500x500.jpg)
![NAMURA Top End & Piston 84.45/+1.50 11:1 Yamaha YFM350X Wolverine 2WD [SRA] YFM350FG Grizzly 4WD [SRA] YFM350G Grizzly 2WD [SRA] YFM350BA Bruin 2WD [SRA] YFM350FA Bruin 4WD [SRA] YFM350FX Wolverine 4WD [SRA] YFM350FGI Grizzly 4WD [IRS] YFM350X Warrior YFM350FW Big Bear 4WD [SRA] YFM350R Raptor YFM350U Big Bear 2WD [SRA] YFM350ER Moto-4 1987-2014 Yamaha YFM350X Wolverine 2WD [SRA] 2006-2009 Yamaha YFM350FG Grizzly 4WD [SRA] 2007-2014 Yamaha YFM350G Grizzly 2WD [SRA] 2007-2012 Yamaha YFM350BA Bruin 2WD [SRA] 2004-2006 Yamaha YFM350FA Bruin 4WD [SRA] 2004-2006 Yamaha YFM350FX Wolverine 4WD [SRA] 1995-2005 Yamaha YFM350FGI Grizzly 4WD [IRS] 2007-2012 Yamaha YFM350X Warrior 1987-2004 Yamaha YFM350FW Big Bear 4WD [SRA] 1987-1999 Yamaha YFM350R Raptor 2004-2013 Yamaha YFM350U Big Bear 2WD [SRA] 1996-1999 Yamaha YFM350ER Moto-4 1987-1995. MPN: NA-40005-6K. SKU: 186-40056.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8445__150_11_1_yam_186_40056_1-1-500x500.jpg)
![NAMURA Top End & Piston 83.95/+1.00 11:1 Yamaha YFM350X Wolverine 2WD [SRA] YFM350FG Grizzly 4WD [SRA] YFM350G Grizzly 2WD [SRA] YFM350BA Bruin 2WD [SRA] YFM350FA Bruin 4WD [SRA] YFM350FX Wolverine 4WD [SRA] YFM350FGI Grizzly 4WD [IRS] YFM350X Warrior YFM350FW Big Bear 4WD [SRA] YFM350R Raptor YFM350U Big Bear 2WD [SRA] YFM350ER Moto-4 1987-2014 Yamaha YFM350X Wolverine 2WD [SRA] 2006-2009 Yamaha YFM350FG Grizzly 4WD [SRA] 2007-2014 Yamaha YFM350G Grizzly 2WD [SRA] 2007-2012 Yamaha YFM350BA Bruin 2WD [SRA] 2004-2006 Yamaha YFM350FA Bruin 4WD [SRA] 2004-2006 Yamaha YFM350FX Wolverine 4WD [SRA] 1995-2005 Yamaha YFM350FGI Grizzly 4WD [IRS] 2007-2012 Yamaha YFM350X Warrior 1987-2004 Yamaha YFM350FW Big Bear 4WD [SRA] 1987-1999 Yamaha YFM350R Raptor 2004-2013 Yamaha YFM350U Big Bear 2WD [SRA] 1996-1999 Yamaha YFM350ER Moto-4 1987-1995. MPN: NA-40005-4K. SKU: 186-40054.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8395__100_11_1_yam_186_40054_1-1-500x500.jpg)
