The Namura NA-40007 piston kit is designed for select Yamaha engines requiring a 95mm standard-bore piston with an 8.5:1 compression ratio. This replacement piston kit is intended for use with the listed Yamaha XT600 and YFM600FG Grizzly 4WD [SRA] applications from the specified model years. It provides a practical replacement solution for engines needing a standard-bore piston assembly while maintaining the original compression specification.
Fitment includes 1998–2001 Yamaha YFM600FG Grizzly 4WD [SRA] models and 1984–1989 Yamaha XT600 models. Confirm the engine application, bore specification, and service requirements before installation to ensure proper compatibility. The Namura NA-40007 is supplied for applications that use the corresponding Namura piston kit configuration.
Important compatibility notice: This piston kit will not accept OEM piston rings, and the supplied rings will not work with an OEM piston. Use the piston and rings as a matched set, and follow the applicable Yamaha service procedures for installation, inspection, clearances, and break-in. The manufacturer is Namura, and the vendor part number is NA-40007.
Features:
- Brand: Namura
- Manufacturer: Namura
- Vendor Part Number: NA-40007
- Size: 95mm standard bore
- Compression Ratio: 8.5:1
- Application: Replacement piston kit for select Yamaha engines
- Fitment: 1998–2001 Yamaha YFM600FG Grizzly 4WD [SRA]
- Fitment: 1984–1989 Yamaha XT600
- Compatibility: Will not accept OEM piston rings, and the included rings will not work with an OEM piston
Fitment:
1984 Yamaha TT600R
1984 Yamaha XT600
1985 Yamaha TT600R
1985 Yamaha XT600
1986 Yamaha TT600R
1986 Yamaha XT600
1987 Yamaha XT600
1988 Yamaha XT600
1989 Yamaha XT600
1990 Yamaha XT600
1991 Yamaha XT600
1992 Yamaha XT600
1993 Yamaha XT600
1994 Yamaha XT600
1995 Yamaha XT600
1996 Yamaha XT600
1998 Yamaha YFM600FG Grizzly 4WD [SRA]
1999 Yamaha XT600
1999 Yamaha YFM600FG Grizzly 4WD [SRA]
2000 Yamaha XT600
2000 Yamaha YFM600FG Grizzly 4WD [SRA]
2001 Yamaha XT600
2001 Yamaha YFM600FG Grizzly 4WD [SRA]
2002 Yamaha XT600