The Namura NA-40000 High-Compression Piston Kit is designed for select Yamaha YFZ350 Banshee twin-cylinder applications from 1987 through 1996. This standard-bore piston kit features a 63.94 mm piston diameter and an 11:1 compression ratio, providing a dependable replacement option for engine rebuilding and performance-oriented maintenance.
Engineered for compatibility with the listed Yamaha Banshee fitment, this Namura piston kit is intended for use in twin-cylinder engines when replacing worn or damaged internal components. Confirm cylinder condition, bore specifications, piston-to-cylinder clearance, and installation requirements before assembly to ensure proper fit and reliable operation.
Important compatibility note: The Namura NA-40000 will not accept OEM piston rings, and its rings will not work with an OEM piston. Use the piston and ring components supplied or specified for this kit rather than mixing them with original-equipment piston components. Manufacturer part number NA-40000 and vendor part number NA-40000 identify this application-specific replacement kit.
Fitment: 1987–1996 Yamaha YFZ350 Banshee.
Features:
- Brand: Namura
- Manufacturer part number: NA-40000
- Vendor part number: NA-40000
- Application: Yamaha YFZ350 Banshee twin-cylinder engine
- Fitment: 1987–1996 Yamaha YFZ350 Banshee
- Piston size: 63.94 mm standard bore
- Compression ratio: 11:1
- Compatibility: Will not accept OEM piston rings, and supplied rings will not work with an OEM piston
- Use: Replacement piston kit for engine rebuilding and maintenance
Fitment:
1987 Yamaha YFZ350 Banshee
1988 Yamaha YFZ350 Banshee
1989 Yamaha YFZ350 Banshee
1990 Yamaha YFZ350 Banshee
1991 Yamaha YFZ350 Banshee
1992 Yamaha YFZ350 Banshee
1993 Yamaha YFZ350 Banshee
1994 Yamaha YFZ350 Banshee
1995 Yamaha YFZ350 Banshee
1996 Yamaha YFZ350 Banshee
1997 Yamaha YFZ350 Banshee
1998 Yamaha YFZ350 Banshee
1999 Yamaha YFZ350 Banshee
2000 Yamaha YFZ350 Banshee
2001 Yamaha YFZ350 Banshee
2002 Yamaha YFZ350 Banshee
2003 Yamaha YFZ350 Banshee
2004 Yamaha YFZ350 Banshee
2005 Yamaha YFZ350 Banshee
2006 Yamaha YFZ350 Banshee