The Namura NA-40080 Standard Piston Kit is designed for select Yamaha 80cc ATV applications, including the YFM80G Grizzly and YFM80R Raptor. This 46.96 mm standard-size piston kit features a 9.6:1 compression ratio and is intended to support dependable engine rebuilding and replacement service.
Fitment: Fits 2005–2008 Yamaha YFM80G Grizzly models and 2002–2007 Yamaha YFM80R Raptor models. Verify the original piston and cylinder specifications before installation to confirm compatibility with your engine.
This Namura piston kit is manufactured for use with the specified application and is supplied for installation with the appropriate compatible components. The piston rings included with this kit will not work with an OEM piston, and OEM rings will not fit this Namura piston. Use the correct Namura replacement rings and follow the manufacturer’s installation instructions, including proper clearance checks, orientation, lubrication, and break-in procedures.
The manufacturer part number is NA-40080, and the vendor part number is 187-40080. Select the standard 46.96 mm size when the cylinder remains within the manufacturer’s standard specifications. Professional installation is recommended for accurate measurement, assembly, and engine setup.
Features:
- Size: Standard 46.96 mm piston size
- Model: 9.6:1 compression ratio piston kit
- Brand: Namura
- Manufacturer Part Number: NA-40080
- Vendor Part Number: 187-40080
- Fitment: 2005–2008 Yamaha YFM80G Grizzly and 2002–2007 Yamaha YFM80R Raptor
- Compatibility: Will not accept OEM rings, and the included rings will not work on an OEM piston
- Application: Replacement piston kit for specified Yamaha 80cc ATV engines
Fitment:
1985 Yamaha YFM80 Badger
1986 Yamaha YFM80 Badger
1987 Yamaha YFM80 Badger
1988 Yamaha YFM80 Badger
1992 Yamaha YFM80 Badger
1993 Yamaha YFM80 Badger
1994 Yamaha YFM80 Badger
1995 Yamaha YFM80 Badger
1996 Yamaha YFM80 Badger
1997 Yamaha YFM80 Badger
1998 Yamaha YFM80 Badger
1999 Yamaha YFM80 Badger
2000 Yamaha YFM80 Badger
2001 Yamaha YFM80 Badger
2002 Yamaha YFM80R Raptor
2003 Yamaha YFM80R Raptor
2004 Yamaha YFM80R Raptor
2005 Yamaha YFM80G Grizzly
2005 Yamaha YFM80R Raptor
2006 Yamaha YFM80G Grizzly
2006 Yamaha YFM80R Raptor
2007 Yamaha YFM80G Grizzly
2007 Yamaha YFM80R Raptor
2008 Yamaha YFM80G Grizzly
2008 Yamaha YFM80R Raptor