1. Antique, Vintage, Historic Motorcycle Parts For Sale
  2. sku: 20850636815091861
  3. YAMAHA 3J2-16139-00

YAMAHA 3J2-16139-00 Dive Chain

fits model: Xs850sg. make: Yamaha. year: 1980–1985.

3j2-16139-00 Yamaha 1980-1985 Xs850sg Inch Special Primary Dive Chain

( Manufacturer Part Number: 3J2-16139-00 ), ( Part Type: Chain )

Review YAMAHA Inch Special Primary Dive Chain fits XS850SG 1980–1985

The **Yamaha 3J2-16139-00 Dive Chain** from the **1980 1985 XS850SG** is a meticulously engineered, high-performance drive chain designed to deliver the raw power and reliability expected from Yamaha s legendary big-bore sport-touring motorcycle. Crafted from premium **3/8-inch pitch roller chain** with **114 links**, this chain is built to withstand the demanding stresses of high-speed cruising, aggressive riding, and the unique "dive" characteristics of the XS850SG s 850cc parallel-twin engine. The chain features **hardened steel rollers and pins**, ensuring extended durability and reduced wear even under heavy loads, while the **oil-impregnated bushings** provide superior lubrication retention, minimizing friction and extending service life. This OEM-specification chain is a direct replacement for the original equipment used in the XS850SG, maintaining the motorcycle s factory performance and handling. Whether you're restoring a classic XS850SG to its original glory or upgrading an existing bike for improved reliability, this chain is a critical component that ensures smooth power delivery, precise shifting, and long-term dependability. Built to Yamaha s exacting standards, it s the perfect choice for riders who demand both authenticity and performance in their restoration or maintenance projects.

### Pros and Cons of buying a Yamaha 3J2-16139-00 (1980 1985 XS850SG Dive Chain)

#### **Pros:**

1. **Authentic Restoration Piece** The dive chain is a genuine, original part for the Yamaha XS850SG, a classic sport bike known for its timeless design and performance. Owning an authentic part ensures the bike retains its historical and mechanical integrity.

2. **Improved Functionality** The dive chain is designed to enhance the bike s suspension and handling by allowing the front fork to compress slightly during hard braking, reducing wheel lock-up and improving stability. This was a notable feature of the XS850SG s suspension setup.

3. **Compatibility** The part is directly interchangeable with the stock chain on the 1980 1985 XS850SG models, requiring no modifications to install. This makes it a straightforward upgrade or replacement option.

4. **Aesthetic Appeal** The dive chain contributes to the bike s classic look, especially if you re restoring or maintaining period-correct aesthetics. It s a subtle but meaningful detail for enthusiasts who value authenticity.

5. **Potential Performance Benefit** While the dive chain s primary purpose is suspension-related, some riders report slight improvements in braking feel and fork compression behavior, which can enhance overall ride quality.

6. **Ease of Installation** Replacing the chain is a relatively simple process for a mechanically inclined rider, requiring basic tools and minimal disassembly of the front fork.

7. **Availability of Aftermarket Support** While the original part may be rare, aftermarket suppliers and restoration communities often have resources or alternatives if the exact part is difficult to source.

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#### **Cons:**

1. **Limited Availability** Original Yamaha dive chains from this era are scarce, and sourcing one may require searching through collectors, restoration shops, or online marketplaces specializing in classic bikes. Prices can be high due to demand.

2. **Cost** Compared to modern or aftermarket alternatives, the original dive chain may be expensive, especially if purchased from a reputable seller. The cost could outweigh the perceived benefit for some riders.

3. **Maintenance Considerations** Like any chain, the dive chain will require periodic lubrication and inspection to prevent wear or stretching. Over time, it may need replacement, adding to long-term maintenance costs.

4. **Modern Alternatives Exist** Some aftermarket manufacturers offer dive chain kits or alternatives designed for modern forks or different bike models. These may be more accessible or cost-effective, though they may not perfectly replicate the original feel.

5. **Potential for Counterfeit Parts** Due to the part s rarity, there is a risk of encountering counterfeit or mislabeled parts. Buyers should verify authenticity through reputable sellers or by inspecting the part s markings and construction.

6. **Minimal Performance Impact** For riders who prioritize raw performance over historical accuracy, the dive chain s benefits may be negligible compared to other upgrades (e.g., modern suspension tuning, brake upgrades, or engine modifications).

7. **Installation Challenges** While the installation is manageable, it requires careful attention to ensure the chain is properly tensioned and aligned with the fork seals. Improper installation could lead to leaks or suspension issues.

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### **Conclusion:**

The Yamaha 3J2-16139-00 dive chain is a valuable component for owners of the 1980 1985 XS850SG who prioritize authenticity, suspension behavior, and classic aesthetics. Its primary advantages lie in its historical accuracy and functional role in the bike s suspension system. However, the part s scarcity, cost, and maintenance requirements may not justify the purchase for every rider. If restoring or maintaining a period-correct XS850SG is the goal, the dive chain is a worthwhile investment. For riders focused on performance or convenience, modern alternatives or other upgrades may be more practical.

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### **Recommendation:**

- **Buy if:** You own a 1980 1985 XS850SG and are committed to a full restoration or maintaining the bike s original specifications. The dive chain is a meaningful detail for enthusiasts who appreciate the bike s heritage and suspension dynamics.

- **Skip if:** You re on a budget, prioritize modern performance over historical accuracy, or can source a reliable aftermarket alternative at a lower cost. In such cases, focus on other upgrades that offer clearer performance gains.

- **Alternative Approach:** If the original part is unavailable, consider consulting with restoration experts or aftermarket suppliers to explore compatible alternatives that replicate the dive chain s function without the premium price.

For those who proceed with the purchase, verify the part s authenticity, inspect it for wear, and ensure proper installation to maximize its benefits.

Details:

1980 - 1981 Yamaha XS850 Standard/Venture model's. Integrity: The teeth-contact surfaces are clean with no heavy scoring or hooking. It shows Minimal/Normal signs of side-play and no kinked links. It is recommended to compare the length /stretch against your current chain while cases are split.

Up for sale is an OEM Primary Drive Chain Hay-VI removed from a 1980 Yamaha XS850 SG Special. 1981 Yamaha XS850SH Special. This is the internal chain that connects crankshaft to clutch basket/middle gear assembly. Fitment: 1980 Yamaha XS850SG Special.

Condition: Stretch/Wear: This chain was pulled from a running engine.

part #: 3j21613900 prices

  • $42.50-$235.27

specifications cyclevintagee:

  • for models: Xs850sg
  • for makes: Yamaha
  • for years: 1980-1985
  • mpn: 3j2-16139-00
  • part type: Chain

seller cyclevintagee:

  • rating: 98.9%
  • # reviews: 162
  • city: Mabelvale, Arkansas

payments cyclevintagee:

  • credit card: Mastercard
  • wallet: Paypal
  • other

general cyclevintagee:

  • Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
  • condition: Used

returns cyclevintagee:

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

shipping cyclevintagee:

  • transit: 4-8 Days
  • type: Fixed
  • carrier: USPS
  • class: Expedited
  • service: USPS Priority Mail Small Flat Rate Box
  • cost: $10.65

offer cyclevintagee:

  • best offers: True
  • availability: In Stock
  • started: February 26, 2026
  • options: Ship-to-home
  • quantity: 1
  • sold: 0
for models: xs850sg, for makes: yamaha, for years: 1980-1985, part type: chain,
category: motorcycle parts > motorcycle scooter parts accessories, sku: 20850636815091861,
Yamaha 3J2-16139-00 Is Similar To:
cyclevintagee logo
2 offers $42.50–$235.27 USD
  • New other (see details). Offer #1 priced at $235.27 + $14.44 shipping estimate = $249.71* total. +$14.44 shipping
  • Used. Offer #2 priced at $42.50 + $10.65 shipping estimate = $53.15* total. This is the internal chain that connects the crankshaft to the clutch basket/middle gear assembly. 1980 Yamaha XS850SG (Special).+$10.65 shipping

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