Namura NA-40005K Top End Repair Kit 82.95mm for Yamaha
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The Namura NA-40005K Top End Repair Kit 82.95mm is an application-specific engine component for Yamaha Moto-4/YFM350 Big Bear 2x4. It is designed for the verified year, make and model combinations listed below.
Key Features
- Includes a piston, rings, wrist pin, clips and application-specific top-end gasket components
- MOS2-coated piston skirt helps reduce friction during break-in
- Machined crown and anodized dome are designed for heat resistance and reduced carbon buildup
- Fitment detail: Piston diameter: 82.95 mm
Manufacturer: Namura
Part Number: NA-40005K
Vehicle Fitment
| Year | Make | Model | Fitment Notes |
|---|---|---|---|
| 1987-1995 | Yamaha | Moto-4 | Piston diameter: 82.95 mm |
| 1987-1998 | Yamaha | YFM350 Big Bear 2x4 | Piston diameter: 82.95 mm |
| 1997-1999 | Yamaha | YFM350 Big Bear 4x4 | Piston diameter: 82.95 mm |
| 2004-2006 | Yamaha | YFM350 Bruin | Piston diameter: 82.95 mm |
| 2007-2014 | Yamaha | YFM350 Grizzly | Piston diameter: 82.95 mm |
| 2004-2013 | Yamaha | YFM350 Raptor | Piston diameter: 82.95 mm |
| 1987-2004 | Yamaha | YFM350 Warrior | Piston diameter: 82.95 mm |
| 1995-2009 | Yamaha | YFM350 Wolverine | Piston diameter: 82.95 mm |
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!
