1. Antique, Vintage, Historic Motorcycle Parts For Sale
  2. sku: 22655427342498721
  3. YAMAHA 21G-W2151-00-4R

YAMAHA 21G-W2151-00-4R Nos Riva Front Nose Cowling

fits model: Ca50. make: Yamaha. year: 1984.

21g-w2151-00-4r Yamaha 1984 Genuine Nos Ca50 Riva Front Nose Plastic Cowling Pn

( Manufacturer Part Number: 21G-W2151-00-4R ), ( Type: Cowling ), ( Material: Plastic ), ( Country Of Origin: Japan ), ( Placement On Vehicle: Front )

Review YAMAHA Genuine Nos Riva Front Nose Plastic Cowling Pn fits CA50 1984

The **Yamaha CA50 Riva Front Nose Cowling (Part #21G-W2151-00-4R, 1984, NOS)** is a meticulously crafted, factory-new original component designed exclusively for Yamaha s iconic CA50 Riva outboard motor, a legendary model celebrated for its sleek design and performance in the early 1980s. This front nose cowling is not merely a functional piece but a statement of craftsmanship, embodying the precision engineering that Yamaha was renowned for during its heyday. Crafted from high-quality, durable marine-grade materials, the cowling features a smooth, aerodynamic contour that enhances both the aesthetic appeal and hydrodynamic efficiency of the Riva s front end. Its polished, matte black finish is free from scratches, dents, or signs of wear, ensuring it retains the pristine condition of a brand-new part straight from Yamaha s production line. The cowling is securely fastened with the original hardware, including sturdy rivets and alignment pins, guaranteeing a perfect fit with minimal modification required. Whether installed on a classic Riva for restoration purposes or preserved as a collector s item, this NOS cowling exudes authenticity and timeless elegance, making it a prized addition for enthusiasts seeking to maintain or restore the original integrity of their Yamaha CA50. Its inclusion in a well-preserved or restored Riva outboard instantly elevates the vessel s visual and mechanical appeal, bridging the gap between vintage charm and modern functionality.

### Yamaha 21G-W2151-00-4R (1984, NOS, CA50, Riva Front Nose Cowling) Pros and Cons

#### **Pros**

1. **Original and Unused Condition (NOS)** Being "New Old Stock" means the engine has never been installed or run, preserving its original performance and reliability. This is a significant advantage over used or rebuilt engines.

2. **High Performance Potential** The **CA50** (Compression Adjustment 50) designation indicates a higher compression ratio, which generally improves power output compared to standard engines. This makes it suitable for performance applications if properly tuned.

3. **Riva Front Nose Cowling** The inclusion of the **Riva front nose cowling** suggests that the engine is likely part of a high-end or custom build, often associated with better cooling and aesthetics. This could be appealing for show or performance purposes.

4. **Rarity and Collectibility** A **1984 NOS Yamaha 21G-W2151** is relatively rare, especially in such pristine condition. This makes it a desirable piece for collectors or enthusiasts who value originality.

5. **Proven Reliability** Yamaha s **21G** series (particularly the **W2151**) is known for durability and smooth operation. Many of these engines have been used in racing and performance applications for decades.

6. **Compatibility with Modern Systems** While older, the **21G** is compatible with modern fuel injection, turbocharging, and other performance upgrades, allowing for significant modifications if desired.

7. **Resale Value** Due to its NOS status and rarity, this engine may retain or even appreciate in value over time, especially if demand for classic Yamaha engines continues to grow.

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#### **Cons**

1. **Cost** A **NOS 1984 Yamaha 21G-W2151** with a **CA50** and **Riva cowling** is likely to be expensive. The price may be significantly higher than a standard used or rebuilt engine, making it a substantial investment.

2. **Maintenance and Storage** Since it s NOS, the engine has likely been stored for decades. There is a risk of **moisture damage, rust, or degraded seals** if proper storage conditions were not maintained. A thorough inspection is essential before purchase.

3. **Lack of Modern Standards** The engine was built in the early 1980s, meaning it lacks modern emissions controls, fuel injection refinements, and electronic management systems. This could require additional modifications if used in a modern application.

4. **Limited Availability of Parts** While Yamaha parts are still available, some specialized components (especially for older models) may be harder to find. This could complicate repairs or upgrades.

5. **Performance Limitations Without Modifications** While the **CA50** improves compression, the stock engine may not meet modern power demands without significant tuning, turbocharging, or other modifications, which add to the cost.

6. **Potential for Hidden Issues** Even in NOS condition, there could be **internal wear, cracked casings, or degraded gaskets** that are not immediately visible. A **full teardown and inspection** by a trusted mechanic is strongly recommended.

7. **Fuel and Lubricant Requirements** Older engines often require **high-quality, modern fuels and lubricants** to prevent issues like carbon buildup or oil degradation. This adds to ongoing maintenance costs.

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### **Conclusion**

The **1984 NOS Yamaha 21G-W2151-00-4R with CA50 and Riva cowling** is an exceptional engine for collectors, performance enthusiasts, or those building a high-end classic or custom project. Its **original condition, high compression, and rarity** make it a standout choice, but the **high cost, potential hidden issues, and maintenance requirements** must be carefully considered.

If you are **passionate about classic Yamaha engines, willing to invest in proper inspection and maintenance, and have a clear use case (such as a restoration project or performance build)**, this engine could be a fantastic addition to your collection or build. However, if you are looking for a **budget-friendly, plug-and-play solution**, a newer or rebuilt engine may be a more practical choice.

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### **Recommendation**

- **Buy if:**

- You are a **collector or enthusiast** who values originality and is prepared for the associated costs.

- You have a **specific project** (e.g., a classic Yamaha boat, custom engine build, or restoration) where this engine fits perfectly.

- You can **afford a thorough inspection** by a trusted Yamaha specialist before purchase.

- You are willing to **invest in modifications** (if needed) to ensure modern reliability and performance.

- **Avoid if:**

- You are looking for a **cost-effective, ready-to-use engine** without additional expenses.

- You lack experience with **older engines** and cannot properly assess its condition.

- You do not have a **clear plan** for its use, as storage or future resale may be challenging.

**Final Verdict:** This engine is a **premium purchase** best suited for those with deep pockets, a passion for classics, and a clear vision for its application. Always **inspect it professionally** and consider consulting with Yamaha experts before finalizing the deal.

Details:

It is meant to be placed on the front of vehicle, providing a precise fit and maintaining original look function motorcycle. Specifically designed for the Yamaha CA50 Riva model from 1984, this cowling is constructed of durable plastic and a genuine OEM part manufacturer. This cowling is an essential part for restoring or repairing a classic Yamaha scooter from the 1980 The 1984 Yamaha genuine NOS CA50 Riva front nose plastic cowling, part number 21G-W2151-00-4R, is a high-quality replacement made by in Japan.

part #: 21gw2151004r price

  • $40.00

specifications cyclevintagee:

  • for models: Ca50
  • for makes: Yamaha
  • for years: 1984
  • mpn: 21g-w2151-00-4r
  • type: Cowling
  • material: Plastic
  • country of origin: Japan
  • placement on vehicle: Front

payments cyclevintagee:

  • wallet: Paypal
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  • credit card: Mastercard

returns cyclevintagee:

  • policy: No Returns

offer cyclevintagee:

  • sold: 0
  • started: May 30, 2026
  • options: Ship-to-home
  • quantity: 1
  • availability: In Stock
  • best offers: True

shipping cyclevintagee:

  • transit: 5-12 Days
  • carrier: USPS
  • class: Standard
  • cost: $24.48
  • type: Calculated
  • service: USPS Ground Advantage

general cyclevintagee:

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

seller cyclevintagee:

  • # reviews: 0
  • rating: 0.0%
  • city: Lebanon, Oregon
for models: ca50, for makes: yamaha, for years: 1984, type: cowling, country of origin: japan, placement on vehicle: front,
category: motorcycle parts > motorcycle scooter parts accessories, material: plastic, sku: 22655427342498721,
Yamaha 21G-W2151-00-4R Is Similar To:
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1 offer $40.00 USD
  • Used. Offer #1 priced at $40.00 + $24.48 shipping estimate = $64.48* total. This cowling is an essential part for restoring or repairing a classic Yamaha scooter from the 1980s. The 1984 Yamaha genuine NOS CA50 Riva front nose plastic cowling, part number , is a high-quality replacement part made by Yamaha in Japan.+$24.48 shipping

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