The Namura NA-40011 Piston Kit is a standard-bore replacement piston assembly designed for select Yamaha 450 ATV and UTV applications. This kit is intended for engines requiring an 84.45 mm piston and supports dependable service during engine rebuilding or top-end maintenance. Manufactured by Namura, the kit is supplied under manufacturer part number NA-40011 and vendor part number NA-40011.
Fitment: Fits 2011–2014 Yamaha YFM450FGP Grizzly 4WD EPS with IRS, 2006–2009 Yamaha YXR450F Rhino 450, and 2007–2008 Yamaha YFM450FG Grizzly 4WD with IRS. Verify the model, year, engine configuration, and piston specifications before ordering to ensure proper application.
Important compatibility information: This Namura 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 piston kit and follow the applicable manufacturer service procedures for installation, clearances, and break-in. The kit is designed as a direct-fit replacement for the listed applications when the engine is prepared for the specified standard-bore piston.
Features:
- Brand: Namura
- Manufacturer part number: NA-40011
- Vendor part number: NA-40011
- Piston size: 84.45 mm standard bore
- Application: Select Yamaha 450 ATV and UTV models
- Fitment: 2011–2014 Yamaha YFM450FGP Grizzly 4WD EPS with IRS
- Fitment: 2006–2009 Yamaha YXR450F Rhino 450
- Fitment: 2007–2008 Yamaha YFM450FG Grizzly 4WD with IRS
- Compatibility: Does not accept OEM piston rings, and supplied rings will not work 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]