Namura Top End Kit 101.97mm Stock Bore 9.2:1 - Yamaha Raptor 700 / Grizzly 700

Complete Top End Rebuild Kit for Yamaha 700s

Namura complete top end kit with everything you need for a Raptor 700 or Grizzly 700 rebuild. Stock bore size (101.97mm) for cylinders within spec or freshly honed.

Why Namura Top End Kits

✓ Complete kit – everything for top end rebuild
✓ Stock bore – works with standard cylinders
✓ MOS2 coated skirts – 10x stronger bond than spray coatings
✓ Anodized dome – 75% stronger than non-anodized
✓ Machined smooth heads – up to 6% HP/fuel economy gain
✓ Hypereutectic casting – higher silicon, better wear resistance
✓ Budget-friendly – quality performance at lower cost

What's Included

- Namura piston (101.97mm, stock bore)
- Piston rings
- Wrist pin & circlips
- Top end bearing
- Complete gasket kit

Does It Fit?

✅ **Yamaha Raptor 700** (2006-2016)
✅ **Yamaha Grizzly 700** (2007-2013)
✅ **Yamaha Rhino 700** (2008-2013)

Quick Specs

Part #: NA-40012K / 186-4012
Bore: 101.97mm (stock OEM size)
Compression: 9.2:1
Coating: MOS2 (Teflon/Molybdenum) skirt
Dome: Anodized
Weight: 2.78 lbs

Advanced Piston Technology

**MOS2 Coated Skirts:**
- Teflon/Molybdenum coating rolled on (not sprayed)
- 10x stronger bond than spray coatings
- Increased heat transfer
- Reduced friction
- Eliminates cold seizures

**Anodized Dome:**
- 75% stronger than non-anodized pistons
- Increased heat resistance
- Superior durability

**Machined Smooth Heads:**
- Reflects combustion heat
- Reduces carbon buildup
- Up to 6% increase in HP & fuel economy

**Hypereutectic Casting:**
- Higher silicon content
- Reduced expansion rates
- Better wear resistance
- Withstands higher cylinder temps

Complete Gasket Kit Included

No hunting for individual gaskets:
- Head gasket
- Base gasket
- Valve cover gasket
- O-rings & seals
- Everything for a complete top end

Why Buy the Complete Kit?

💰 **Save Money** – Costs less than buying parts separately
📦 **Save Time** – Everything arrives together
✅ **Peace of Mind** – All parts matched and ready

Stock Bore vs. Oversize

**Stock Bore (this kit):**
- 101.97mm - OEM size
- Use with cylinders in spec
- Works with freshly honed cylinders
- No boring required

**+0.01 Oversize (different kit):**
- 101.98mm
- For slightly worn cylinders

9.2:1 Compression

**Perfect for:**
- Pump gas (87-91 octane)
- Stock or mild builds
- Reliable trail/work use
- Grizzly utility applications

When You Need This Kit

Replace top end if you have:
- Worn piston/cylinder (in spec)
- Loss of compression
- High mileage rebuild
- Complete top end refresh
- Budget-friendly rebuild

Installation Notes

⚙️ Difficulty: Intermediate to Advanced
🔧 Requires: Cylinder honing, ring gap measurement
🔧 Check: Piston-to-wall clearance
👨🔧 Pro install recommended

Pro Tip

💡 Measure your cylinder bore before ordering. If it's worn beyond spec, you may need an oversize piston. If within spec, this stock bore kit is perfect with a fresh hone.

What Else You Might Need

⚠️ Not included:
- Cylinder honing service (recommended)
- Engine assembly lube
- Torque wrench

⚠️ IMPORTANT COMPATIBILITY NOTE

**This Namura kit is NOT compatible with OEM Yamaha parts:**
- Namura rings will NOT fit OEM pistons
- OEM rings will NOT fit Namura pistons

Always use matching brand piston/ring combinations.

Warranty & Support

🛡️ For warranty issues, contact WPS directly
📞 Missing/incorrect parts: Resolution Team ext. 266
📧 Failed installed parts: resolutionteam@wps-inc.com (with photos & RA form)

Questions?

📞 541-668-7503
📧 Support@dunegoonshop.info

Ships same day before 3pm EST ⚡
5 in stock - Ready to ship!