YAMAHA 90508-70115-00 Rear Torsion Spring Sr 90508-70155. Spring.

( Part Type: Spring ), ( UPC: 905087011500 )

Review YAMAHA 90508-70155. Oem Rear Torsion Spring. Sw Sr fits SL SS

The **Yamaha 90508-70115-00 / 90508-70155 Rear Torsion Spring** is a precision-engineered component designed exclusively for Yamaha s **SW (Sportwagon) and SR (Sport) series** models, ensuring optimal performance, safety, and ride quality for these versatile and high-performance vehicles. Crafted from high-grade, heat-treated steel, this torsion spring is built to withstand the demanding stresses of daily driving, off-road adventures, and aggressive maneuvering, making it an essential part of the rear suspension system. The spring s robust construction features a **tight coil winding** and a **smooth, polished finish**, which not only enhances durability but also minimizes friction and wear over time, extending the lifespan of the entire suspension assembly. Engineered to Yamaha s exact specifications, this spring is compatible with models equipped with either the **SW or SR suspension variants**, providing the correct torque and load-bearing capacity required for a balanced and responsive ride. Whether navigating tight corners, handling rough terrain, or simply cruising on paved roads, this torsion spring delivers consistent performance, helping to maintain proper suspension geometry, wheel alignment, and overall vehicle stability. Its seamless integration into Yamaha s suspension system ensures that drivers experience the full intended handling dynamics of their vehicle, from precise steering feedback to a comfortable, well-damped ride. For enthusiasts and mechanics alike, this component represents a critical upgrade or replacement part that upholds the integrity of Yamaha s reputation for engineering vehicles that blend sportiness with practicality.

### Yamaha 90508-70115-00 and 90508-70155 Rear Torsion Spring (SW/SR) Pros and Cons

#### **Overview**

These parts are rear torsion springs for Yamaha motorcycles, specifically designed for models like the **YZF-R1, R6, MT-07, or other sport/touring bikes** with a swingarm suspension system. The **90508-70115-00** and **90508-70155** refer to different spring rates or configurations (likely for **SW (standard weight)** and **SR (sport/reduced weight)** applications). These springs are critical for suspension performance, affecting ride comfort, handling, and durability.

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### **Pros**

1. **OEM Quality and Reliability**

- Yamaha s aftermarket parts are generally well-engineered to match or exceed original equipment standards. They are designed to work seamlessly with the bike s suspension system, reducing the risk of compatibility issues.

2. **Improved Ride Quality**

- If the original springs are worn or stretched, replacing them with fresh OEM or high-quality aftermarket springs can restore proper suspension function. This leads to:

- Better damping and rebound control.

- Reduced body roll and improved stability at high speeds.

- A more comfortable ride by maintaining optimal spring tension.

3. **Enhanced Performance**

- For sportier applications (e.g., track use or aggressive riding), aftermarket springs (like those from **Yamaha or reputable brands**) can offer stiffer rates for better handling and cornering grip. The **SR version** may be tuned for lighter riders or track use, while the **SW version** could be more versatile for street riding.

4. **Durability and Longevity**

- New springs are less likely to fail prematurely compared to worn-out originals. High-quality materials reduce the risk of corrosion or fatigue, especially in harsh conditions.

5. **Easy Installation**

- These springs are relatively straightforward to replace, requiring basic tools and mechanical knowledge. Yamaha provides clear instructions, and many riders can complete the job in under an hour.

6. **Cost-Effective Upgrade**

- Compared to full suspension overhauls or aftermarket suspension kits, replacing just the springs is a budget-friendly way to improve ride quality. Prices are reasonable, and they often come with a warranty.

7. **Compatibility with Other Parts**

- Yamaha s suspension components are designed to work together. Upgrading springs can complement other modifications (e.g., shock tuning, sway bar adjustments) for a balanced setup.

---

### **Cons**

1. **Limited Customization**

- OEM springs are not adjustable; they come with fixed rates. Riders seeking extreme stiffness or softness may need aftermarket alternatives (e.g., **Progressive springs, coilovers, or adjustable shocks**).

- The **SW/SR distinction** may not cater to all weight classes or riding styles without further tuning.

2. **Potential for Over/Under-Specification**

- Excessive body movement (if too soft).

- Harsh ride quality or premature wear (if too stiff).

- Poor traction or instability at high speeds.

3. **Installation Challenges**

- Removing the swingarm (may need a lift or stands).

- Careful handling of the springs to avoid over-tightening or under-tightening, which can affect suspension geometry.

- Potential for misalignment if not installed correctly, leading to uneven tire wear or handling issues.

4. **Warranty Implications**

- If the bike is under warranty, replacing OEM parts with aftermarket (even Yamaha s own) may void certain coverage. Always check the warranty terms before proceeding.

5. **Durability Concerns with Aftermarket Alternatives**

- While Yamaha s parts are reliable, cheaper third-party springs may lack the same build quality, leading to premature failure or inconsistent performance.

6. **Noisy or Unsettled Feel**

- If the springs are not properly lubricated or if the suspension bushings are worn, the system can develop rattles or clunks. This may require additional maintenance (e.g., greasing the swingarm pivots).

7. **Limited Availability of Information**

- Unlike coilovers or adjustable shocks, torsion springs have less community-driven tuning data. Riders may lack clear guidance on which spring rate suits their specific needs (weight, riding style, bike modifications).

---

### **Conclusion**

Replacing the rear torsion springs on your Yamaha with **90508-70115-00 (SW) or 90508-70155 (SR)** is a **practical and cost-effective upgrade** for restoring or enhancing suspension performance. These parts offer **reliability, OEM compatibility, and improved ride quality**, making them a solid choice for riders looking to maintain or slightly improve their bike s handling without a major overhaul.

However, they are **not ideal for extreme customization** riders seeking aggressive stiffness or softness should explore aftermarket progressive springs or coilovers. The **main drawbacks** revolve around limited adjustability, potential installation pitfalls, and the risk of mismatched spring rates for individual preferences.

---

### **Recommendation**

- **Replace them with the OEM Yamaha parts** (90508-70115-00 or 90508-70155) to restore factory suspension performance. This is the safest and most straightforward option.

- Research your **weight, riding style, and bike modifications** to determine if you need a stiffer or softer spring. Consider **Yamaha s SR version** if you re a lighter rider or track-oriented, or the **SW version** for general street use.

- Pair the spring upgrade with **sway bar adjustments or shock tuning** for a balanced setup.

- Investigate **aftermarket progressive springs** (e.g., **YSS, hlins, or Fox**) or **coilovers** if you want adjustable damping and stiffness.

- Verify compatibility with your **exact model year** (some bikes have slight variations).

- Check for **warranty implications** if your bike is under manufacturer coverage.

- Consult **mechanics or suspension experts** if unsure about spring rates or installation.

- After installation, **grease the swingarm pivots** and **check suspension bushings** to prevent future noise or wear.

---

### **Final Verdict**

For most riders, **Yamaha s 90508-70115-00 or 90508-70155 rear torsion springs** are a **worthwhile upgrade** to maintain or slightly enhance suspension performance. They strike a balance between **cost, reliability, and ease of installation**, making them ideal for routine maintenance or modest tuning. However, those seeking aggressive performance gains should explore more advanced suspension solutions. Always prioritize **proper installation and compatibility** to ensure optimal results.

Details:

SL292C 1971-1973. Some NOS parts show normal shelf wear from age. SL338B 1971/1972. OEM Rear Torsion Spring.

Feel free to ask questions. Yamaha 90508-70155. Please research part number for specifications to ensure this will work your vehicles make, model and year. Fits Yamaha Years and model's stated are given as a range may or not include all years within.

part #: 905087011500 prices

• $15.95-$20.65

specifications snowmobileshocksoi:

• for models: Sl, Ss
• for makes: Yamaha
• part type: Spring
• upc: 905087011500

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