Namura NA-40005R Piston Ring Set Standard Bore for Yamaha
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The Namura NA-40005R Piston Ring Set Standard Bore is an application-specific engine component for Yamaha BW 350T (Big Wheel)/Moto-4. It is designed for the verified year, make and model combinations listed below.
Key Features
- Application-specific ring set designed for the listed piston and bore size
- Compression-ring materials and coatings are selected for wear resistance and sealing
- Confirm piston compatibility and any oversize specification before ordering
Manufacturer: Namura
Part Number: NA-40005R
Vehicle Fitment
| Year | Make | Model |
|---|---|---|
| 1987-1988 | Yamaha | BW 350T (Big Wheel) |
| 1987-1995 | Yamaha | Moto-4 |
| 1987-1998 | Yamaha | YFM350 Big Bear 2x4 |
| 1997-1999 | Yamaha | YFM350 Big Bear 4x4 |
| 2004-2006 | Yamaha | YFM350 Bruin |
| 2007-2014 | Yamaha | YFM350 Grizzly |
| 2004-2013 | Yamaha | YFM350 Raptor |
| 1987-2004 | Yamaha | YFM350 Warrior |
| 1995-2009 | Yamaha | YFM350 Wolverine |
| 2000-2012 | Yamaha | YFM400 Big Bear |
| 1993-1999 | Yamaha | YFM400F/FW Kodiak |
Fitment note: Match the year, make, model and any listed specifications to your machine before ordering. Professional installation is recommended for internal engine components.
Shipping & Returns
- Most orders process within 1 business day.
- 30-day returns on new, unused items.
Once your Steel Steeds gear leaves our warehouse, it typically arrives at your doorstep within 2–4 business days, unless otherwise noted. We partner with trusted shipping carriers to ensure your off-road essentials get to you fast and hassle-free. So gear up with confidence—your next big adventure is just around the corner!
Changed your mind? No problem. Most new, unused, and uninstalled items can be returned within 30 days of delivery.
We do not charge a standard restocking fee. Customers are responsible for return shipping unless the item arrived damaged, defective, or incorrect.
Items must be returned in original packaging and in resalable condition.
We are committed to providing quality products and stand behind our items with a warranty. Exact coverage may vary, so please refer to our warranty page for more details!
