YAMAHA 90508-65091-00 Rear Torsion Spring 90508-65091. Spring. 73-74

( Part Type: Spring ), ( UPC: 905086509100 )

Review YAMAHA 90508-65091. Oem Rear Torsion Spring. 73-74 fits SM292

The **Yamaha 90508-65091-00 Rear Torsion Spring (SM292, 73-74)** is a precision-engineered component designed exclusively for select Yamaha motorcycles from the 1973 to 1974 model years, specifically tailored for the iconic **SM292** series, which includes models like the **Yamaha SR250** and **Yamaha DT250**. This torsion spring plays a critical role in the suspension system, providing the necessary torque and responsiveness to ensure a smooth, controlled ride while maintaining optimal handling and stability. Crafted from high-grade, heat-treated steel, this spring is built to endure the demands of daily use, delivering consistent performance even under varying load conditions. Its robust construction minimizes wear and fatigue, extending the lifespan of the suspension components and contributing to the overall durability of the motorcycle. The spring s design is optimized for the unique suspension geometry of the SM292 platform, ensuring seamless integration with the rear shock absorber and swingarm assembly. Whether navigating winding roads, cruising on highways, or tackling off-road terrain, this torsion spring helps absorb and dissipate vibrations, enhancing rider comfort and control. For restoration projects or routine maintenance, this genuine Yamaha part guarantees a perfect fit and reliable performance, upholding the original engineering standards of these classic bikes. Its availability as an original equipment replacement part ensures that enthusiasts and mechanics can restore or maintain their Yamaha SM292 models with confidence, knowing they are using a component that meets the exact specifications of the manufacturer.

The **Yamaha 90508-65091-00 (rear torsion spring for SM292, model years 1973 1974)** is a critical part for restoring or maintaining a classic Yamaha SM292 motorcycle. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of buying a Yamaha 90508-65091-00 Rear Torsion Spring**

1. **Authentic Fitment**

The spring is designed specifically for the **SM292 (1973 1974)**, ensuring a perfect match with the rear suspension system. Using an OEM part minimizes compatibility issues and ensures proper function.

2. **Reliability and Durability**

Yamaha s original components were built to last, especially for the torsion spring, which is a load-bearing part of the rear suspension. A genuine or high-quality aftermarket replica will provide consistent performance over time.

3. **Restoration Accuracy**

If you re restoring an SM292 to showroom condition, using the correct OEM part (or an exact replica) maintains historical authenticity. This is important for collectors and enthusiasts who prioritize originality.

4. **Ease of Installation**

The spring is straightforward to install, requiring only basic tools and mechanical knowledge. Yamaha s design is simple, making it accessible even for riders with limited suspension experience.

5. **Support for Original Ride Feel**

The torsion spring contributes to the SM292 s classic, slightly firm ride. Replacing a worn or broken spring restores the intended handling characteristics, which can be a key factor for riders who appreciate the bike s original feel.

6. **Prevents Further Damage**

A failing torsion spring can lead to suspension misalignment, chain tension issues, or even damage to the swingarm or rear axle. Replacing it proactively avoids costly repairs down the line.

7. **Availability of Genuine Parts**

While aftermarket options exist, the OEM part is still available through Yamaha dealers or reputable classic motorcycle part suppliers. This ensures you re getting a part that meets Yamaha s original specifications.

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### **Cons of buying a Yamaha 90508-65091-00 Rear Torsion Spring**

1. **Cost**

The part is not inexpensive, especially if purchased new from a Yamaha dealer. Prices can range from **$50 to $100 **, depending on the source. This may be a significant investment for riders on a tight budget.

2. **Limited Availability of Aftermarket Alternatives**

While the OEM part is reliable, aftermarket options (such as those from **Yamaha Classic Parts, Speed Parts, or eBay sellers**) may be harder to find in stock. Some aftermarket springs may not be as precise, potentially affecting ride quality.

3. **Potential for Counterfeit Parts**

Buying from unverified sellers (e.g., untrusted online marketplaces) risks receiving a **fake or low-quality replica**. Always purchase from reputable dealers to avoid this issue.

4. **Installation Challenges for Beginners**

While the spring itself is simple, removing the old one may require disassembling the rear wheel or swingarm. Riders unfamiliar with suspension work might find the process frustrating without proper guidance.

5. **Wear on Related Components**

If the spring has been stretched or damaged for an extended period, other parts (such as the **rear axle, swingarm bushings, or shock absorber**) may also be worn. Replacing just the spring could lead to premature failure of these components if they re neglected.

6. **Time-Consuming for Full Restoration**

If you re restoring the entire SM292, replacing the torsion spring is just one of many tasks. The time and effort required to source and install it may feel like a small but necessary step in a larger project.

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### **Conclusion**

The **Yamaha 90508-65091-00 rear torsion spring** is a **highly recommended purchase** for SM292 owners, especially those prioritizing **authenticity, reliability, and proper suspension function**. Its benefits such as exact fitment, durability, and restoration accuracy far outweigh the drawbacks, which are mostly related to **cost and potential availability issues**.

However, if budget is a concern, **aftermarket alternatives** (from trusted suppliers) can be a cost-effective option, though they may not match the OEM part s precision. Always verify the seller s reputation before purchasing to avoid counterfeit or substandard parts.

For **collectors, restorers, or riders who value the SM292 s original character**, the OEM spring is the best choice. For **budget-conscious riders**, a high-quality aftermarket replica (with proper research) can be a viable alternative.

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### **Final Recommendation**

- You are restoring or maintaining an SM292 and want **authentic, high-quality parts**.

- You have access to a **reputable dealer** (Yamaha Classic Parts, authorized sellers, or trusted online marketplaces).

- You are willing to invest in **long-term reliability** and proper suspension function.

- You are on a **tight budget** and can find a **highly rated replica** (e.g., from **Speed Parts, Classic Yamaha Parts, or eBay with verified feedback**).

- You are confident in **researching the seller** to avoid counterfeit parts.

- Always **inspect the spring for cracks, corrosion, or excessive stretching** before installation.

- Pair the replacement with a **check of the rear axle, swingarm bushings, and shock absorber** to ensure the entire suspension is in good condition.

- If unsure about installation, consult a **Yamaha specialist or classic motorcycle mechanic** for guidance.

This part is a **small but crucial investment** in keeping your SM292 running smoothly and true to its original design.

Details:

Yamaha 90508-65091. Fits Yamaha SM292 73-74. Years and model's stated are given as a range may or not include all years within. Please research part number for specifications to ensure this will work your vehicles make, model and year.

Feel free to ask questions. OEM Rear Torsion Spring. Some NOS parts show normal shelf wear from age.

part #: 905086509100 price

• $14.50

specifications snowmobileshocksoi:

• for models: Sm292
• for makes: Yamaha
• part type: Spring
• upc: 905086509100

payments snowmobileshocksoi:

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offer snowmobileshocksoi:

• sold: 0
• quantity: 2
• options: Ship-to-home
• availability: In Stock
• started: June 8, 2026

shipping snowmobileshocksoi:

• transit: 4-10 Days
• type: Calculated
• cost: $11.35
• class: Standard
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• carrier: USPS

general snowmobileshocksoi:

• Parts Accessories > Snowmobile Parts > Shocks Suspension
• condition: New other see details

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• city: Townsend,
• rating: 99.9%
• # reviews: 54226

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