HONDA 91005-MK4-701 Nos Crankshaft Balancer Bearing GB500

( Manufacturer Part Number: 91005-MK4-701 ), ( Type: Crankshaft Balancer Bearing ), ( Country Of Origin: Japan )

Review HONDA Nos Genuine Crankshaft Balancer Bearing fits XR600R XR650R XR650L NX650

The **Honda 91005-MK4-701 NOS (New Old Stock) Crankshaft Balancer Bearing** is a precision-engineered component designed exclusively for Honda s high-performance twin-cylinder engines, including the iconic **XR600R, XR650R, XR650L, GB500, and the rugged off-road and adventure-ready NX650**. This bearing is a critical part of the engine s crankshaft assembly, ensuring smooth operation, reduced vibration, and optimal power delivery by maintaining the precise balance of the rotating crankshaft components. Crafted from high-grade **bearing steel** and treated with Honda s proprietary **anti-friction coatings**, this bearing is built to withstand the demanding stresses of high-revving engines, off-road terrain, or aggressive riding styles without compromising durability or performance. The **MK4-701 designation** confirms its compatibility with the fourth-generation crankshaft design used in these models, making it a direct, drop-in replacement for failed or worn bearings eliminating the need for costly engine modifications or custom machining. Whether you're restoring a classic XR650R to its original glory, upgrading a GB500 for track use, or maintaining an NX650 for long-distance adventures, this **NOS bearing** delivers the reliability and performance expected from Honda s legendary engineering. Its **sealed construction** prevents contamination from dirt, debris, or moisture, while its **precisely machined dimensions** ensure a perfect fit within the crankshaft s journal and the balancer housing, reducing lateral play and extending the life of the entire drivetrain. For riders and mechanics who demand nothing less than the highest quality, this bearing represents the pinnacle of Honda s aftermarket support offering a seamless blend of authenticity, performance, and longevity.

### **Pros and Cons of buying a Honda 91005-MK4-701 NOS Crankshaft Balancer Bearing (XR600R, XR650R, XR650L, NX650, GB500)**

1. **Direct Fitment** This bearing is designed specifically for Honda s MK4 engine family, ensuring compatibility with the XR600R, XR650R, XR650L, NX650, and GB500 models. It eliminates the need for modifications or adapters.

2. **New Old Stock (NOS) Quality** Being NOS means the bearing is new but has been stored in its original packaging, ensuring it is in pristine condition with no wear or damage. This reduces the risk of premature failure compared to used or aftermarket parts.

3. **Reliability** Honda s original components are known for durability and precision engineering. A genuine bearing will maintain proper crankshaft balance, reducing vibration and improving engine smoothness.

4. **Ease of Installation** Since it is an OEM part, installation should be straightforward, especially if you have experience working on these engines. No special tools or modifications are typically required beyond standard engine service procedures.

5. **Long-Term Performance** A high-quality bearing will last the life of the engine if properly lubricated and maintained, preventing costly repairs from premature wear or failure.

6. **Warranty Coverage** If purchased from a reputable dealer or seller, the bearing may come with a warranty, providing peace of mind against defects.

7. **Compatibility with Aftermarket Upgrades** If you plan to modify your engine (e.g., crankshaft balancing, performance tuning), this bearing will integrate seamlessly with other OEM components.

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1. **Cost** NOS parts are generally more expensive than aftermarket or used alternatives. Depending on the seller and market conditions, this bearing could be significantly pricier than a non-OEM replacement.

2. **Limited Availability** Finding a genuine NOS bearing in stock may require searching multiple sellers, especially if demand is high or supply is limited. Some online marketplaces may have long wait times or require special orders.

3. **Potential for Counterfeit Parts** Since NOS parts are valuable, there is a risk of encountering counterfeit or salvaged "new" bearings. Always verify the seller s reputation and authenticity of the part (e.g., check serial numbers, packaging, and seller reviews).

4. **Overkill for Minor Repairs** If the bearing is only failing due to a minor issue (e.g., contamination or a single bad bearing), replacing the entire assembly may be unnecessary. In some cases, cleaning and re-greasing the existing bearing could suffice.

5. **Storage and Handling Risks** Even though it s NOS, improper handling (e.g., exposure to moisture, dirt, or physical damage during shipping) could compromise the bearing s condition. Always inspect the part upon receipt.

6. **No Performance Advantage Over OEM Replacements** Unless the original bearing was defective, a NOS part will not offer any performance benefits over a new OEM bearing from Honda s official parts catalog. It s primarily a reliability and authenticity upgrade.

7. **Potential for Overpaying** Some sellers may inflate prices due to the "NOS" label or rarity. Researching comparable parts and prices on forums (e.g., Cycle World, Honda forums) can help ensure you re getting a fair deal.

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The **Honda 91005-MK4-701 NOS crankshaft balancer bearing** is an excellent choice if you prioritize **reliability, authenticity, and ease of installation** for your XR600R, XR650R, XR650L, NX650, or GB500. Its direct fitment and high-quality construction make it ideal for restorations, long-term builds, or when you want to avoid the risks of aftermarket parts. However, the **higher cost and potential for counterfeits** mean you should weigh these factors against your budget and needs.

If you re on a tight budget or only need a replacement due to a minor failure, a **new OEM bearing from Honda s official parts department** or a **high-quality aftermarket bearing** (e.g., from reputable brands like **Fel-Pro, Moroso, or Dura-Bal**) could be a more cost-effective alternative. Always verify the part s authenticity and condition before purchasing.

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- You value **authenticity and long-term reliability** above cost.

- You re restoring a classic bike or building a high-mileage project where OEM parts are preferred.

- You ve **verified the seller s reputation** and the part s condition (e.g., unopened packaging, matching serial numbers).

- You re willing to pay a premium for peace of mind.

- You re on a **tight budget** and can find a **new OEM bearing** or **trusted aftermarket bearing** at a lower price.

- The failure is **isolated** (e.g., only one bearing is bad), and you re comfortable with a **used or refurbished part** from a reliable source.

- You re unsure about the **seller s legitimacy** stick to **Honda-approved dealers** or well-reviewed online marketplaces.

**Final Tip:** If possible, **compare prices across multiple sellers** (eBay, Honda parts dealers, specialty motorcycle forums) and check for **authenticity guarantees**. Always inspect the part upon arrival to ensure it meets your expectations.

Details:

part #: 91005mk4701 prices

• $29.99-$35.15

specifications bearingmotorcycleiz:

• for models: Xr600r, Xr650r, Xr650l, Nx650
• for makes: Honda
• mpn: 91005-mk4-701
• type: Crankshaft Balancer Bearing
• country of origin: Japan

general bearingmotorcycleiz:

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

seller bearingmotorcycleiz:

• city: Englewood, Colorado
• rating: 99.9%
• # reviews: 91707

returns bearingmotorcycleiz:

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

payments bearingmotorcycleiz:

• credit card: Mastercard
• wallet: Google-pay
• other

offer bearingmotorcycleiz:

• sold: 0
• quantity: 1
• started: April 30, 2026
• availability: In Stock
• options: Ship-to-home

shipping bearingmotorcycleiz:

• type: Calculated
• class: Standard, Expedited
• cost: $0.00
• transit: 2-6 Days
• carrier: USPS, UPS
• service: USPS Ground Advantage, USPS Priority Mail, UPS Ground

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