YAMAHA 90508-20583-00 Spring Torsion

( Part Type: Spring ), ( Vintage Part: Yes ), ( Country Of Origin: Japan ), ( UPC: 905082058300 )

Review YAMAHA Vintage Oem Spring Torsion fits TT600N 1985

The **Yamaha TT600N Spring Torsion (Model 90508-20583-00, circa 1985)** is a rare and highly sought-after component from Yamaha s iconic TT600 series, a motorcycle known for its lightweight design, nimble handling, and timeless appeal. This specific part is a **spring torsion unit**, a critical element in the motorcycle s rear suspension system, designed to balance ride comfort, stability, and performance. The TT600N, a trail and touring hybrid, relied on such precision-engineered components to deliver a smooth yet responsive ride across varied terrains, from winding mountain roads to open highways. The **1985 model year** of this torsion spring unit reflects Yamaha s engineering refinements during that era, where attention to detail in suspension tuning was paramount for optimizing both comfort and control. Crafted from high-grade steel, this torsion spring is built to endure the stresses of daily riding while maintaining its structural integrity over time. Its unique design allows for adjustable preload, enabling riders to fine-tune the suspension s firmness to match their weight, riding style, or load conditions. Whether restoring a classic TT600N or maintaining one in peak condition, this part ensures that the motorcycle s legendary agility and balance remain intact. For collectors and enthusiasts, the **90508-20583-00** torsion spring is not just a functional component but a piece of automotive history, embodying Yamaha s commitment to innovation and rider-centric design in the golden age of motorcycle engineering.

### Yamaha TT600N (1985 Model) Pros and Cons

#### **Pros**

1. **Classic Design and Aesthetics** The TT600N is a timeless motorcycle with a clean, minimalist look that appeals to enthusiasts who appreciate vintage styling. Its simple, functional design remains visually striking even by modern standards.

2. **Reliability and Durability** Yamaha built the TT600N to be a practical, long-lasting machine. Many examples from the 1980s and early 1990s still run reliably today, especially if well-maintained. The air-cooled, parallel-twin engine is known for its robustness.

3. **Simplicity and Low Maintenance** Compared to modern bikes, the TT600N has fewer electronic components, making it easier to diagnose and repair. The torsion bar suspension and basic braking system (single disc front, drum rear) are straightforward to service.

4. **Fuel Efficiency** The 599cc air-cooled engine is relatively efficient for its class, offering better mileage than many modern sportbikes or cruisers. It typically consumes around 40-50 mpg (6.5-5.5 L/100km), depending on riding style.

5. **Lightweight and Maneuverable** Weighing around 400-450 lbs (180-200 kg), the TT600N is nimble and easy to handle, making it suitable for urban commuting or light touring. Its compact size also makes it easy to park and store.

6. **Vintage Appeal and Collectibility** For enthusiasts who enjoy the nostalgia of classic motorcycles, the TT600N holds a certain charm. It s a well-regarded model in the vintage market, and well-preserved examples can appreciate in value over time.

7. **Affordable Upkeep** Parts for the TT600N are still relatively accessible, though some may require sourcing from specialty vendors. Labor costs for basic repairs are generally lower than for modern bikes with complex electronics.

8. **Versatile Riding Experience** The bike s balanced power delivery and neutral handling make it enjoyable for both city riding and light highway cruising. It s not a high-performance machine, but it s comfortable and predictable.

9. **No Modern Complexity** Unlike bikes with ABS, traction control, or fuel injection, the TT600N relies on a carbureted, mechanically simple engine. This means fewer things can go wrong, and repairs are often easier to tackle without specialized tools.

10. **Potential for Restoration or Customization** If you re mechanically inclined, the TT600N offers opportunities for restoration or modification. Swapping in modern components (e.g., a new carburetor, exhaust, or suspension) can breathe new life into the bike.

---

#### **Cons**

1. **Outdated Safety Features** The TT600N lacks modern safety advancements such as ABS, traction control, or even a reliable rear disc brake (originally equipped with a drum brake). This makes it less safe in high-speed or slippery conditions compared to contemporary bikes.

2. **Poor Weather Protection** The bike has minimal wind protection, and the seat is often uncomfortable for long rides. There s no windscreen or fairing, so riders are exposed to wind, rain, and road debris.

3. **Limited Power and Performance** The 599cc air-cooled engine produces around 45-50 horsepower, which is adequate for light cruising but feels underpowered compared to modern bikes. Acceleration and top-speed capabilities are modest, making highway passes feel slow.

4. **Basic Braking System** The original setup includes a single front disc brake and a rear drum brake, which are less effective than modern multi-piston calipers or dual-disc setups. Stopping power is adequate but not impressive.

5. **Comfort Limitations** The ergonomics of the TT600N are basic. The seat is firm and unyielding, the handlebars are high and narrow, and the footpegs are small. Long rides can be uncomfortable, especially for taller riders.

6. **Rust and Wear Issues** Many 1985 TT600Ns have spent decades exposed to the elements, leading to rust in critical areas like the frame, suspension, and exhaust. A thorough inspection is essential before purchase.

7. **Carburetion Challenges** The bike uses a single carburetor (often a Mikuni or Dell Orto), which can be finicky with altitude, temperature changes, or fuel quality. Tuning may require adjustments or upgrades.

8. **Limited Aftermarket Support** While parts are available, the aftermarket for the TT600N is not as extensive as for more modern or popular bikes. Finding rare or high-quality components can be difficult.

9. **No Modern Conveniences** The bike lacks features like electric start, digital instrumentation, or even a reliable kickstart mechanism (some examples have seized starters). Starting the bike may require physical effort or a pull-start.

10. **Potential for Hidden Problems** Vintage bikes often hide issues like seized bearings, worn-out suspension, or frame cracks. A thorough mechanical inspection by a trusted professional is crucial to avoid costly repairs.

11. **Resale Value Depends on Condition** Unlike some classic bikes, the TT600N s resale value is tied heavily to its condition. A well-maintained example may hold value, but a neglected one could be difficult to sell.

12. **Legal Restrictions in Some Areas** Depending on local regulations, the TT600N may not meet modern safety or emissions standards. Some regions require modifications (e.g., catalytic converters, updated lighting) to register the bike legally.

---

### **Conclusion**

The Yamaha TT600N (1985) is a fantastic choice if you re looking for a **simple, reliable, and affordable** motorcycle with vintage charm. It excels as a **commuter, weekend cruiser, or project bike** for those who enjoy mechanical work and appreciate classic design. The bike s low cost of ownership, ease of repair, and nostalgic appeal make it ideal for riders who prioritize functionality over modern frivolities.

However, if you re seeking **performance, safety, or comfort**, the TT600N falls short. Its outdated braking, lack of wind protection, and modest power make it less suitable for high-speed riding or long-distance touring. Additionally, the bike s age means it requires **attention to maintenance and potential restoration work** to ensure reliability.

For the right buyer someone who values **simplicity, history, and hands-on ownership** the TT600N is a rewarding purchase. For those expecting a **modern, high-performance, or comfortable** ride, it may not meet expectations.

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### **Recommendation**

- You enjoy vintage motorcycles and appreciate classic design.

- You re comfortable with basic mechanical work and don t mind occasional repairs.

- You prioritize reliability, fuel efficiency, and low maintenance costs.

- You plan to use it for **light commuting, weekend rides, or as a project bike**.

- You re willing to invest time in restoring or maintaining it to keep it running smoothly.

- You expect modern safety features (ABS, traction control, disc brakes).

- You need a comfortable, high-speed, or long-distance touring bike.

- You re not prepared for potential rust, wear, or mechanical issues.

- You want a bike with minimal hassle and modern conveniences.

- You re looking for a high-performance or high-value investment.

**Final Verdict:** The TT600N is a **great choice for enthusiasts who love the simplicity and character of classic bikes** but may not be the best fit for riders seeking a hassle-free, modern riding experience. With proper care, it can provide years of enjoyable riding just be prepared for the quirks that come with its age.

Details:

When buying used parts, keep in mind that components like bearings, ball joints, seals, O-rings, and gaskets may be worn should inspected or replaced as needed. What you see is exactly what you'll receive. I highly recommend replacing any bearings or seals before installing the part on your machine to ensure best performance. You can call or me at and I ll be happy to help.

Kawasaki F6 125 or a Honda TRX 350 Yamaha xt550, ATC 185 feel free to reach out. All parts are sold as-is.

part #: 905082058300 prices

• $8.65-$15.00

specifications cyclevintagee:

• for models: Tt600n
• for makes: Yamaha
• for years: 1985
• part type: Spring
• vintage part: Yes
• country of origin: Japan
• upc: 905082058300

general cyclevintagee:

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

returns cyclevintagee:

• policy: No Returns

shipping cyclevintagee:

• cost: $0.00
• transit: 5-10 Days
• class: Standard
• carrier: USPS
• service: USPS Ground Advantage
• type: Calculated

offer cyclevintagee:

• sold: 0
• availability: In Stock
• started: March 5, 2026
• options: Ship-to-home
• quantity: 1
• best offers: True

payments cyclevintagee:

• other
• wallet: Google-pay
• credit card: Mastercard

seller cyclevintagee:

• # reviews: 182
• rating: 99.3%
• city: Salina, Kansas

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