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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
Top End & Piston 83.45/+0.50 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
Top End & Piston 82.95/STD 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
Top End & Piston 101.47/+1.50 11:1 Yamaha YFM660R Raptor 2001-2005
Top End & Piston 100.47/+0.50 11:1 Yamaha YFM660R Raptor 2001-2005
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![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)
![NAMURA Top End & Piston 83.45/+0.50 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 1987-1991. MPN: NA-40005-2K. SKU: 186-40052.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8345__050_11_1_yam_186_40052_1-1-500x500.jpg)
![NAMURA Top End & Piston 82.95/STD 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-40005K. SKU: 186-4005.](https://motomacia.com/wp-content/uploads/2025/03/namura_top_end_kit_8295_std_11_1_yam_186_4005_1-1-500x500.jpg)
