NAMURA ORNA-RA490663-NG Wristpin Bearing Bike

( Brand: Namura ), ( Manufacturer Part Number: ORNA-RA490663-NG ), ( Part Type: Bearing )

Review NAMURA Yamaha Bw Dirt Bike Wristpin Bearing fits 1980–1990

The **Namura Orna-RA490663-NG 1990 Yamaha BW-80 Wristpin Bearing** is a meticulously engineered, high-performance replacement part designed to restore optimal functionality and longevity to the suspension system of the iconic Yamaha BW-80 motorcycle. Crafted from premium-grade **chromium-molybdenum steel**, this bearing is precision-machined to exacting standards, ensuring a seamless fit within the bike s wristpin assembly. The **RA490663-NG** designation signifies Namura s proprietary **Orna-RA** technology, which incorporates a **dual-layered construction** combining a hardened outer shell with a high-load-capacity inner race to deliver superior durability under extreme conditions. This design minimizes friction, reduces wear on the surrounding components, and enhances the bike s handling responsiveness, making it an ideal upgrade for riders seeking to maintain or improve the BW-80 s legendary agility and reliability. The bearing s **tight tolerance specifications** ensure a snug yet smooth articulation, preventing premature failure while accommodating the bike s classic suspension geometry. Whether restoring a vintage BW-80 to its original performance or enhancing an existing setup, this Namura bearing stands as a testament to precision engineering, offering a direct replacement that exceeds OEM standards in both performance and endurance. Built to withstand the rigors of daily riding, off-road adventures, or long-term storage, it is a critical component for any enthusiast aiming to preserve the integrity of their Yamaha s suspension system.

### **Pros and Cons of Buying a Used Yamaha BW80 Wristpin Bearing (Namura Orna-RA490663-NG, 1990 Model)**

1. **Compatibility and Fitment** The Namura Orna-RA490663-NG is a direct replacement for the wristpin bearing in the 1990 Yamaha BW80 engine. It is designed to match the original specifications, ensuring proper installation and function.

2. **Quality and Durability** Namura is a well-regarded manufacturer of motorcycle engine parts, known for producing high-quality, long-lasting components. Their bearings are often made from durable materials like steel or high-grade alloys, reducing the risk of premature failure.

3. **Cost-Effective Repair** Purchasing a new wristpin bearing is significantly cheaper than replacing the entire engine or piston assembly. This makes it a practical solution for restoring performance and preventing catastrophic engine damage.

4. **Ease of Installation** Since this is a standard bearing, replacing it is a relatively straightforward DIY job for someone with basic mechanical skills. It requires minimal specialized tools, though proper engine disassembly and reassembly knowledge is still necessary.

5. **Performance Benefits** A new wristpin bearing reduces friction, which can improve engine smoothness, reduce noise, and potentially enhance fuel efficiency. It also prevents potential issues like piston slap or bearing wear that could lead to costly repairs.

6. **Warranty and Reliability** Reputable sellers (such as eBay, specialized motorcycle parts stores, or authorized distributors) may offer warranties or return policies, providing peace of mind against defects.

7. **Prevents Engine Damage** Wristpin bearings wear over time, and failure can cause severe engine damage, including piston seizure or crankshaft damage. Replacing it proactively avoids such expensive repairs.

---

1. **Age and Wear of Other Components** The 1990 Yamaha BW80 may have other worn parts (e.g., piston rings, crankshaft, or cylinder walls) that could affect performance even after replacing the bearing. A full engine inspection is recommended.

2. **Potential Counterfeit or Low-Quality Parts** Buying from untrusted sellers (especially online marketplaces) risks receiving counterfeit or substandard bearings. Always verify the seller s reputation and part authenticity.

3. **Labor Costs if Not DIY** If you re not comfortable performing the repair yourself, labor costs at a motorcycle shop can be high, especially for older models like the BW80.

4. **Limited Availability of Tools** Some specialized tools (e.g., piston ring compressors, bearing pullers) may be needed, and older bikes often require older or harder-to-find tools.

5. **Risk of Improper Installation** Incorrect installation (e.g., cross-threading, improper lubrication) can damage the bearing or engine. This requires careful attention to the manufacturer s instructions.

6. **Compatibility with Modified Engines** If the engine has been modified (e.g., oversized pistons, different crankshafts), the bearing may not fit correctly. Always confirm compatibility with the bike s specifications.

7. **Resale Value Impact** While replacing a bearing is a minor repair, it doesn t significantly increase the bike s resale value. The bike s overall condition and mileage will still be the primary factors in its market worth.

---

Replacing the wristpin bearing in a 1990 Yamaha BW80 with a **Namura Orna-RA490663-NG** is a **highly recommended** maintenance task for restoring engine reliability and preventing costly failures. The bearing is a critical component, and its failure can lead to severe engine damage. The pros such as cost-effectiveness, improved performance, and ease of installation far outweigh the cons, provided the part is genuine and installed correctly.

However, the repair should be part of a **broader engine inspection**. If other components (like piston rings or the crankshaft) are worn, they should be addressed simultaneously to ensure long-term reliability. Additionally, purchasing from a **trusted seller** and verifying the part s authenticity is crucial to avoid counterfeit or low-quality replacements.

- **Buy the bearing from a reputable supplier** (e.g., official Namura distributors, well-reviewed online retailers, or specialized motorcycle parts stores).

- **Perform a full engine teardown** to inspect other critical components (pistons, rings, crankshaft, cylinder walls) and replace them if necessary.

- **Follow the manufacturer s installation guidelines** carefully to avoid damage during assembly.

- **Consider professional help** if you lack experience with engine repairs, especially for older bikes.

- **Document the repair** for future reference, as it may be useful for resale or warranty purposes.

If the bike is a project or a daily rider, this repair is **worth the investment** and will significantly extend the engine s lifespan. For a well-maintained bike, it s a **cost-effective way to prevent a major failure**.

Details:

This is helpful if you are buying multiple items. 1990 Yamaha BW 80 Dirt Bike Namura Wristpin Bearing: Wrist-Pin Bearing Contains: One Bearing. Compatibility: Yamaha BW80 1986 - 1988, 1990 , PW 80 1983 2006. Parts without fitment are to be assumed universal and may require vehicle modification.

Actual Contents may vary from Photo Namura offers direct replacements for the original equipment as well hi-compression and a variety of oversized to meet your rides needs. Credit or Debit Card.: Brand: Namura, model Number: ORNA-RA490663-NG. I need to exchange an item.

part #: ornara490663 prices

• $12.35-$16.66

specifications bearingmotorcycleiz:

• for makes: Yamaha
• for years: 1980-1990
• brand: Namura
• mpn: Orna-ra490663-ng
• part type: Bearing

shipping bearingmotorcycleiz:

• class: Standard
• type: Fixed
• cost: $0.00
• transit: 3-6 Days
• service: Standard

offer bearingmotorcycleiz:

• availability: In Stock
• sold: 0
• options: Ship-to-home
• quantity: 2
• started: February 28, 2026

payments bearingmotorcycleiz:

• credit card: Diners-club
• wallet: Google-pay
• other

general bearingmotorcycleiz:

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

returns bearingmotorcycleiz:

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

seller bearingmotorcycleiz:

• city: Indiana, US
• # reviews: 78735
• rating: 99.8%

Namura ORNA-RA490663 Is Similar To:

• 09-b001-1 Namura Piston Pin Bearing (38.8% similar) Part: 15X19X16.7 prices...(February 7th, 2018)
• 09-b005-1 Namura Piston Pin Bearing (38.8% similar) Part: 16X21X22.5 prices...(February 7th, 2018)
• 09-b006-1 Namura Piston Pin Bearing (38.8% similar) Part: 14X18X17.2 prices...(February 7th, 2018)
• 09-b012-1 Namura Piston Pin Bearing (38.8% similar) Part: 14X18X15.8 prices...(July 26th, 2017)
• 09-b037-1 Namura Piston Pin Bearing (38.8% similar) Motor city sports center, inc. Some images show accessories that are not included with the product. Expedited shipping via USPS priority mail with delivery confirmation is available. Fitment data may not list all model's and years that is 100 correct. This occasionally happens, and is rare. This ...(February 22nd, 2018)
• 09-b038-1 Namura Piston Pin Bearing (38.8% similar) This occasionally happens, and is rare. Expedited shipping via USPS priority mail with delivery confirmation is available. Namura 09-B038-1 piston pin bearing id OD length 15X20X17. This image is a manufacturers photo and meant to be representative of the item listed. Fitment data may not list all...(February 23rd, 2018)
• 09-b041 Namura Piston Pin Bearing (39.6% similar) Part: 12X15X14.5 prices...(February 7th, 2018)
• 09-b042-2 Namura Technologies Piston Pin Bearing (37.9% similar) Riders addiction brand new Namura technologies 09-B042-2 piston pin bearing 12X14. This occasionally happens, and is rare. Expedited shipping via USPS priority mail with delivery confirmation is available...(January 8th, 2019)
• 09-b043-1 Namura Piston Pin Bearing (38.8% similar) Part: 12X16X14.8MM prices...(February 7th, 2018)
• Namura Technologies 09-513-1 Wrist Pin Bearing Caged Needle For Ktm Measures 16mm X 20mm 19.5mm (34.4% similar) Made in Taiwan. Compatible with KTM model's below: 2003 200 SC. Manufactured by Namura. 2006 200 XC-w. Measures 16MM x 20MM 19.5MM. 2007 200 XC-w...(September 20th, 2023)
• Namura Orna-ra531453-ng 2008-2009 Ktm 105xc Dirt Bike Wristpin Bearing (71% similar) 2008-2009 KTM 105XC dirt bike Namura wristpin bearing: wrist-pin bearing contains: one bearing. Compatibility: Honda CR80R 1986 - 2002 , CR85R 2003 2007 , Suzuki RM80 1991 2001 , RM85 2002 2012 , yamaha YZ80 1993 YZ85 2014 . Parts without fitment are to be assumed universal and may ...(October 18th, 2023)