HONDA 91006-KK0-771 Nos Crankshaft Balancer Bearing

( Manufacturer Part Number: 91006-KK0-771 ), ( Type: Crankshaft Balancer Bearing ), ( Country Of Origin: Japan )

Review HONDA Nos Genuine Crankshaft Balancer Bearing fits NX250 TRX400 XL250R XR250R XR400R

The **Honda 91006-KK0-771 NOS Crankshaft Balancer Bearing** is a high-performance, aftermarket replacement part designed specifically for Honda s legendary air-cooled single-cylinder engines found in models such as the **NX250, TRX400, XL250R, XR250R, and XR400R**. This bearing is a **new old stock (NOS) unit**, meaning it is a genuine, unused part sourced from a discontinued or surplus inventory, ensuring it retains the original quality and specifications Honda intended for these engines. Crafted from premium **bearing steel**, this component is precision-machined to exact tolerances, providing smooth operation, reduced vibration, and enhanced durability critical for maintaining the reliability of these rugged, off-road-capable motorcycles. The bearing is engineered to fit seamlessly within the crankshaft assembly, supporting the main journal and counterbalancing forces generated by the reciprocating piston and connecting rod, thereby reducing wear on the crankshaft itself and extending the lifespan of the entire drivetrain. Ideal for riders seeking to restore stock performance, improve engine smoothness, or address wear in high-mileage engines, this bearing is a straightforward yet impactful upgrade. Its compatibility with a range of Honda s classic ATC (All-Terrain Cycle) models makes it a versatile choice for both restoration projects and performance modifications, ensuring that the engine runs with the precision and efficiency of a fresh, factory-built unit. Whether you're tackling a classic trail bike, a rugged dual-sport, or a reliable off-road adventure machine, this **91006-KK0-771 NOS Crankshaft Balancer Bearing** delivers the reliability and performance you expect from Honda s legendary air-cooled engines.

### **Pros and Cons of Buying a NOS Crankshaft Balancer Bearing (Honda Part #91006-KK0-771) for TRX400, XL250R, XR250R, XR400R, and NX250**

#### **Pros**

1. **Improved Engine Balance** A worn or damaged crankshaft balancer bearing can cause excessive vibration, leading to poor engine smoothness and potential damage to other components. Replacing it restores proper balance, reducing wear on the crankshaft, connecting rods, and engine mounts.

2. **Extended Engine Life** If the bearing is failing, it can lead to catastrophic engine failure (such as a bent crankshaft or rod damage). Replacing it proactively prevents costly repairs.

3. **Better Performance & Reliability** A smooth-running engine operates more efficiently, improving throttle response and reducing power loss caused by vibration-induced friction.

4. **Prevents Secondary Damage** A failing balancer bearing can damage the crankshaft journals, main bearings, or even the engine block over time. Replacing it early avoids compounded issues.

5. **OEM Quality & Fit** Honda s NOS (New Old Stock) parts are designed to match original specifications, ensuring a proper fit without modification.

6. **Cost-Effective for Long-Term Use** While the part itself is relatively inexpensive, replacing it before failure is far cheaper than dealing with a seized engine or bent crankshaft.

7. **Easy Installation** The bearing is a straightforward replacement, typically requiring only basic tools and minimal disassembly (depending on the bike s condition).

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#### **Cons**

1. **Potential for Counterfeit Parts** Since this is a NOS part, there is a risk of purchasing a fake or low-quality replica, especially if buying from untrusted sellers. Always verify authenticity through reputable dealers or Honda-approved suppliers.

2. **Labor Costs if Not DIY** If the bike is not in good condition or requires significant disassembly (e.g., removing the engine from the frame), professional labor costs can add up.

3. **Additional Wear Indicators May Be Needed** If the bearing is failing, other components (such as the crankshaft or main bearings) may already be worn. A full inspection is recommended to avoid future issues.

4. **Limited Availability** NOS parts may not always be in stock, requiring patience or ordering from specialty suppliers.

5. **Mismatched Condition with Other Components** If the bike has other neglected parts (e.g., worn pistons, rods, or bearings), replacing just the balancer bearing may not fully resolve vibration issues.

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### **Conclusion**

Replacing a worn crankshaft balancer bearing is a **highly recommended maintenance task** for any Honda dual-sport or off-road bike (TRX400, XL250R, XR250R, XR400R, NX250) showing signs of vibration, rough idle, or unusual noise. The benefits improved balance, extended engine life, and prevention of costly damage far outweigh the risks, provided the part is genuine and installed correctly.

If the bike is already showing symptoms of bearing failure (excessive vibration, knocking, or oil contamination), **do not delay replacement**. However, if the bike is otherwise in good condition, this is a preventative measure worth considering during routine maintenance.

### **Recommendation**

- **Purchase from a trusted source** (Honda dealership, reputable aftermarket suppliers, or verified online retailers) to ensure the part is genuine.

- **Inspect other critical components** (crankshaft, main bearings, connecting rods) while the engine is out to catch any hidden wear.

- **Follow proper installation procedures** ensure the bearing is correctly seated and lubricated with fresh oil.

- **Consider professional help** if the bike s condition or your mechanical skill level makes DIY installation difficult.

For most riders, this is a **low-risk, high-reward upgrade** that keeps the engine running smoothly for many more miles.

Details:

Genuine Honda.

part #: 91006kk0771 prices

• $10.00-$22.57

specifications bearingmotorcycleiz:

• for models: Nx250, Trx400, Xl250r, Xr250r, Xr400r
• for makes: Honda
• mpn: 91006-kk0-771
• type: Crankshaft Balancer Bearing
• country of origin: Japan

offer bearingmotorcycleiz:

• availability: In Stock
• options: Ship-to-home
• sold: 0
• started: April 10, 2026
• quantity: 2

general bearingmotorcycleiz:

• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Engine Bearings
• condition: New

returns bearingmotorcycleiz:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

payments bearingmotorcycleiz:

• credit card: Diners-club
• other
• wallet: Paypal

shipping bearingmotorcycleiz:

• type: Calculated
• carrier: USPS, UPS
• service: USPS Ground Advantage, USPS Priority Mail, UPS Ground
• transit: 4-10 Days
• cost: $0.00
• class: Standard, Expedited

seller bearingmotorcycleiz:

• rating: 99.9%
• city: Englewood, Colorado
• # reviews: 91206

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