![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](https://omxsports.com/wp-content/uploads/2025/08/namura_186_40112_1-1-430x430.jpg)
MPN: NA-40011-2K 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](https://omxsports.com/wp-content/uploads/2025/08/namura_186_4011_1-1-430x430.jpg)
![Alternative view of 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](https://omxsports.com/wp-content/uploads/2025/08/namura_186_4011_2-1-430x430.jpg)
MPN: NA-40011K 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](https://omxsports.com/wp-content/uploads/2025/08/namura_186_40106_1-1-430x430.jpg)
PARTS
Top End & Piston 101.47/+1.50 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008
MPN: NA-40010-6K 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](https://omxsports.com/wp-content/uploads/2025/08/namura_186_40104_1-1-430x430.jpg)
PARTS
Top End & Piston 100.97/+1.00 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008
MPN: NA-40010-4K 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](https://omxsports.com/wp-content/uploads/2025/08/namura_186_40102_1-1-430x430.jpg)
PARTS
Top End & Piston 100.47/+0.50 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008
MPN: NA-40010-2K YAMAHA YFM660FG GRIZZLY 4WD [IRS] YXR660F RHINO 660 2002-2008
![Top End & Piston 99.97/STD 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008](https://omxsports.com/wp-content/uploads/2025/08/namura_186_4010_1-1-430x430.jpg)
![Alternative view of Top End & Piston 99.97/STD 11:1 Yamaha YFM660FG Grizzly 4WD [IRS] YXR660F Rhino 660 2002-2008](https://omxsports.com/wp-content/uploads/2025/08/namura_186_4010_2-1-430x430.jpg)
MPN: NA-40010K YAMAHA YFM660FG GRIZZLY 4WD [IRS] YXR660F RHINO 660 2002-2008
PARTS
PISTON RINGS 94.95MM GAS/ FOR NAMURA PISTONS ONLY Gas-Gas Yamaha EC 450F YZ450F WR450F 2003-2015
MPN: NA-40009R GAS-GAS YAMAHA EC 450F YZ450F WR450F 2003-2015
MPN: NA-40009HK YAMAHA YFZ450 2004-2013
MPN: NA-40009-CK YAMAHA YFZ450 2004-2013
MPN: NA-40009-BHK 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](https://omxsports.com/wp-content/uploads/2025/08/namura_186_40084_1-1-430x430.jpg)
MPN: NA-40008-4K 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](https://omxsports.com/wp-content/uploads/2025/08/namura_186_40082_1-1-430x430.jpg)
MPN: NA-40008-2K YAMAHA YFM400FG GRIZZLY 4WD [IRS] YFM400FA KODIAK 4WD [SRA] YFM400A KODIAK 2WD [SRA] 2000-2008