SPORTS PARTS INC 1659-S385159-39 Spi Shock Bushing Ski Doo

( Brand: Sports Parts Inc ), ( Manufacturer Part Number: 1659-S385159-39 ), ( Part Type: Shock Bushing )

Review SPORTS PARTS INC Spi Shock Bushing Ski doo Snowmobile fits FORMULA MACH XTC 1990–1991

The **SPI Shock Bushing (Part #1659-S385159-39)** is a precision-engineered, high-performance replacement component specifically designed to restore optimal suspension function and handling to the **1990-1991 Ski-Doo Formula Mach XTC**. This bushing serves as a critical interface between the shock absorber and the frame, ensuring smooth, controlled movement while absorbing the harsh impacts of off-road terrain, jumps, and aggressive riding. Crafted from durable, rubberized elastomer with reinforced internal cord reinforcement, the bushing is engineered to withstand extreme forces, prevent premature wear, and maintain consistent rebound and compression performance key factors in preserving the Mach XTC s legendary agility and stability. Unlike generic aftermarket alternatives, this SPI part is meticulously calibrated to match the original equipment specifications, eliminating the "soft" or "stiff" feel that can compromise ride quality. Its precise fit ensures proper shock travel, reduces unwanted frame flex, and minimizes energy loss during high-speed maneuvers, allowing riders to push the limits of their XTC with confidence. Whether tackling technical trails, hitting big jumps, or carving through tight corners, this bushing enhances the suspension s responsiveness, extends the lifespan of the shock system, and helps maintain the Mach XTC s reputation for being one of the most capable and versatile snowmobiles of its era. Ideal for both restoration projects and performance upgrades, the SPI Shock Bushing is a straightforward yet impactful modification that keeps the heart of the XTC s suspension beating strong delivering the same legendary ride feel that enthusiasts have come to expect from Ski-Doo s legendary Formula line.

### **Pros and Cons of buying a Sports 1659-S385159-39 SPI Shock Bushing for a 1990-1991 Ski-Doo Formula Mach XTC**

1. **Improved Ride Comfort** The SPI shock bushing is designed to reduce vibration and harshness, leading to a smoother ride, especially on rough terrain. This can make long rides less fatiguing for the rider.

2. **Enhanced Durability** High-quality bushings like the SPI model are engineered to withstand repeated stress, reducing wear on the suspension components. This can extend the lifespan of your suspension system, saving you money in the long run.

3. **Better Handling and Stability** A properly functioning shock bushing helps maintain consistent suspension performance, improving steering response and reducing body roll. This can make your Ski-Doo feel more stable, especially at higher speeds or on uneven trails.

4. **Compatibility with Aftermarket Mods** If you ve made other suspension or performance upgrades (e.g., stiffer springs, adjusted shocks), a high-quality bushing ensures that these modifications work as intended without premature failure.

5. **Easier Installation** The SPI bushing is a direct replacement part, meaning it should fit without extensive modifications. Many aftermarket bushings require cutting or reshaping, but this one is designed to drop right in.

6. **Reduced Noise and Rattling** Worn-out bushings can cause excessive noise and rattling, which this replacement should eliminate, improving the overall riding experience.

7. **OEM-Quality Alternative** While not an exact OEM part, the SPI bushing is a reputable aftermarket brand known for durability and performance, offering a balance between cost and quality.

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1. **Cost Compared to OEM** The SPI bushing will likely be more expensive than a generic or no-name replacement, though it may still be cheaper than an OEM part if available. For a Ski-Doo, this could be a noticeable upfront cost.

2. **Potential Overkill for Light Use** If your Ski-Doo is primarily used for casual riding on smooth trails, the benefits of a premium bushing may not justify the expense. For heavy-duty or aggressive use, the investment pays off.

3. **Installation Skill Required** While the part is designed for easy installation, improper handling (e.g., overtightening, misalignment) could damage the bushing or surrounding components. If you re not comfortable with suspension work, you may need to pay a mechanic.

4. **Limited Availability** Aftermarket parts for older Ski-Doo models (like the 1990-1991 Formula Mach XTC) can be harder to find than for newer models. Ensure the part is in stock before purchasing to avoid delays.

5. **Mixed Reviews on Longevity** Some users report that while SPI bushings are durable, they may not last as long as OEM parts in extreme conditions (e.g., frequent off-roading, heavy loads). Expect to replace them every few years if used intensively.

6. **No Warranty on Some Retailers** Depending on where you purchase it, the SPI bushing may not come with a warranty. Always check the seller s return or warranty policy before buying.

7. **Possible Compatibility Issues** While the part is designed for your model, slight variations in suspension geometry or wear could require minor adjustments during installation. Double-check measurements if your suspension has been modified.

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### **Conclusion**

The **Sports 1659-S385159-39 SPI shock bushing** is a solid aftermarket upgrade for your 1990-1991 Ski-Doo Formula Mach XTC, offering noticeable improvements in comfort, durability, and handling. It strikes a balance between performance and cost, making it a worthwhile investment if you prioritize suspension reliability and ride quality.

However, if your Ski-Doo sees minimal use or you re on a tight budget, the benefits may not outweigh the cost. In that case, a budget-friendly generic bushing could suffice. For serious riders who push their machines hard, the SPI bushing is a recommended choice just ensure proper installation and maintenance to maximize its lifespan.

### **Recommendation**

- You want to improve ride comfort and reduce vibration.

- You ve made or plan to make suspension modifications.

- You ride frequently on rough or demanding terrain.

- You re willing to pay a premium for a high-quality, long-lasting part.

- Your Ski-Doo is used sporadically on smooth trails.

- You re unable to install it properly (consider a mechanic).

- You find a high-quality OEM or equivalent aftermarket part at a lower cost.

- You re unsure about the part s availability or compatibility with your specific suspension setup.

**Final Verdict:** For the average rider who wants a reliable, performance-focused upgrade, the SPI bushing is a **strong recommendation**. Just ensure you source it from a trusted seller and handle installation carefully.

Details:

Brand: Sports Parts Inc, model Number: 1659-S385159-39. I need to exchange an item. Parts without fitment are to be assumed universal and may require vehicle modification. SPI Shock Bushing for 1990 - 1991 Ski-Doo Formula Mach 1 XTC Snowmobile: Shocks are designed to work with OEM bushings, springs and collars, Sold pair.

This is helpful if you are buying multiple items. Compatibility: Years: Make: model: Application: Notes: 1990 - 1991 Ski-Doo Formula Mach 1, 1991 1 X, 1989 1990 Ski-Doo Formula Plus LT, 1987 MX, 1992 Ski-Doo Safari GLX, 1991 Ski-Doo Safari LXE, XTC, MX 1993 1994 Ski-Doo Safari Deluxe, 1993 Ski-Doo Safari Rally, L, 1994 Rally E, 1990 Ski-Doo Safari LC, 1994 Ski-Descant II 503R SLT, Plus, LCE, 503R, 1992 II, LX, LE, R.

part #: 1659s38515939 price

• $16.66

specifications snowmobileshocksoi:

• for models: Xtc, Formula, Mach
• for makes: Ski-doo
• for years: 1990-1991
• brand: Sports Parts Inc
• mpn: 1659-s385159-39
• part type: Shock Bushing

shipping snowmobileshocksoi:

• service: Standard
• cost: $0.00
• type: Fixed
• class: Standard
• transit: 3-7 Days

seller snowmobileshocksoi:

• # reviews: 83486
• rating: 99.9%
• city: San Marcos, CA

offer snowmobileshocksoi:

• started: April 21, 2026
• quantity: 9
• options: Ship-to-home
• availability: In Stock
• sold: 0

payments snowmobileshocksoi:

• other
• wallet: Paypal
• credit card: Diners-club

returns snowmobileshocksoi:

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

general snowmobileshocksoi:

• condition: New
• Parts Accessories > Snowmobile Parts > Shocks Suspension

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