The Namura NA-40011-2 Piston Kit is a replacement piston assembly designed for select Yamaha 450 ATV and side-by-side applications. This 84.95 mm piston kit features a +0.020 in oversize specification and is intended for engines requiring cylinder boring to match the piston size. It provides a dependable replacement option during an engine rebuild or top-end service.
Fitment: Fits 2007–2008 Yamaha YFM450FG Grizzly 4WD with IRS, 2011–2014 Yamaha YFM450FGP Grizzly 4WD EPS with IRS, and 2006–2009 Yamaha YXR450F Rhino 450. Verify the cylinder bore, year, model, and engine specifications before installation to ensure proper compatibility.
Important: The Namura NA-40011-2 piston kit will not accept OEM piston rings, and its rings will not work with an OEM piston. Use the rings supplied or specified for this Namura piston kit. Professional installation and measurement of the cylinder are recommended to confirm the required clearance and ensure proper engine performance.
Manufacturer: Namura. Vendor part number: NA-40011-2. This piston kit is built for riders and technicians seeking a correctly matched oversize piston and ring combination for restoring compression and renewing the top end of a compatible Yamaha 450 engine.
Features:
- Size: 84.95 mm piston with a +0.020 in oversize specification
- Model: Piston kit for select Yamaha Grizzly 450 and Rhino 450 applications
- Brand: Namura
- Manufacturer part number: NA-40011-2
- Vendor part number: NA-40011-2
- Fitment: 2007–2008 Yamaha YFM450FG Grizzly 4WD with IRS
- Fitment: 2011–2014 Yamaha YFM450FGP Grizzly 4WD EPS with IRS
- Fitment: 2006–2009 Yamaha YXR450F Rhino 450
- Compatibility: Does not accept OEM piston rings, and the supplied rings are not compatible with an OEM piston
Fitment:
2003 Yamaha YFM450FA Kodiak 4WD [IRS]
2004 Yamaha YFM450FA Kodiak 4WD [IRS]
2005 Yamaha YFM450FA Kodiak 4WD [IRS]
2006 Yamaha YFM450FA Kodiak 4WD [IRS]
2006 Yamaha YFM450FX Wolverine 4WD [SRA]
2006 Yamaha YXR450F Rhino 450
2007 Yamaha YFM450FG Grizzly 4WD [IRS]
2007 Yamaha YFM450FX Wolverine 4WD [SRA]
2007 Yamaha YXR450F Rhino 450
2008 Yamaha YFM450FG Grizzly 4WD [IRS]
2008 Yamaha YFM450FX Wolverine 4WD [SRA]
2008 Yamaha YXR450F Rhino 450
2009 Yamaha YFM450FG Grizzly 4WD [IRS]
2009 Yamaha YFM450FX Wolverine 4WD [SRA]
2009 Yamaha YXR450F Rhino 450
2010 Yamaha YFM450FG Grizzly 4WD [IRS]
2010 Yamaha YFM450FX Wolverine 4WD [SRA]
2011 Yamaha YFM450FG Grizzly 4WD [IRS]
2011 Yamaha YFM450FGP Grizzly 4WD EPS [IRS]
2012 Yamaha YFM450FG Grizzly 4WD [IRS]
2012 Yamaha YFM450FGP Grizzly 4WD EPS [IRS]
2013 Yamaha YFM450FG Grizzly 4WD [IRS]
2013 Yamaha YFM450FGP Grizzly 4WD EPS [IRS]
2014 Yamaha YFM450FG Grizzly 4WD [IRS]
2014 Yamaha YFM450FGP Grizzly 4WD EPS [IRS]
2018 Yamaha YFM450FA Kodiak 4WD [IRS]
2019 Yamaha YFM450FA Kodiak 4WD [IRS]
2020 Yamaha YFM450FA Kodiak 4WD [IRS]