SPORTS PARTS INC 2551-S332943-31 Spi Moly Upper Arm

( Brand: Sports Parts Inc ), ( Manufacturer Part Number: 2551-S332943-31 ), ( Part Type: Arm )

Review SPORTS PARTS INC Spi Chrome Moly Upper A arm black Polaris fits SWITCHBACK ASSAULT 800 2012–2014

The **SPI Moly Upper A-Arm (Part #2551-S332943-31) in Black** is a high-performance, precision-engineered suspension component designed exclusively for the **2012 2014 Polaris 800 Switchback Assault**, ensuring optimal handling, durability, and off-road capability. Crafted from **high-grade, heat-treated steel**, this upper A-arm is built to withstand the rigorous demands of aggressive riding, from rough terrain to high-speed trails, while maintaining structural integrity and alignment stability. The **black powder-coated finish** not only enhances the aesthetic appeal of your Switchback Assault but also provides an extra layer of protection against corrosion, ensuring longevity even in harsh, off-road conditions. This component is a direct replacement for the OEM part, featuring **precisely machined mounting points** that guarantee a perfect fit with the frame and other suspension elements, minimizing sag and maximizing responsiveness. Whether you're tackling steep climbs, navigating tight switchbacks, or pushing the limits on technical descents, the **SPI Moly Upper A-Arm** delivers superior rigidity and control, allowing for sharper steering feedback and improved ride consistency. Built to SPI Moly s exacting standards, this part is a testament to engineering excellence, offering riders the confidence to conquer any trail with precision and power. Upgrade your Switchback Assault s suspension with this **black, high-performance upper A-arm** and experience a noticeable difference in handling, durability, and overall off-road performance.

### **Pros and Cons of buying a SPI Moly Upper A-Arm (Part # 2551-S332943-31) for a 2012-2014 Polaris 800 SwitchBack Assault**

1. **Improved Ride Quality** The SPI Moly upper A-arm is designed to reduce vibration and harshness, particularly on rough or uneven terrain. This can make long rides more comfortable by dampening impacts from the suspension and trail surface.

2. **Durability and Strength** SPI Moly components are known for their high-quality construction, often featuring reinforced materials or heat-treated steel. This can extend the lifespan of the A-arm compared to stock parts, especially if you frequently ride on abrasive or rocky terrain.

3. **Better Handling and Stability** Some riders report that upgrading to aftermarket A-arms improves the bike s responsiveness and stability, particularly in aggressive riding conditions. The slight modifications in geometry or material can enhance cornering and trail control.

4. **Compatibility with Other Modifications** If you re running other performance upgrades (e.g., stiffer suspension, wider tires, or lowered seat height), the SPI Moly A-arm may complement those changes by maintaining proper alignment and reducing stress on other components.

5. **Easier Installation** SPI Moly parts are often designed with straightforward installation in mind, and they come with clear instructions. Some users find that aftermarket A-arms require fewer adjustments than stock parts to achieve optimal performance.

6. **Potential for Customization** Depending on the specific model, some aftermarket A-arms allow for minor adjustments (e.g., bolt-on modifications for different suspension setups), which can fine-tune your bike s handling to your preferences.

7. **Warranty and Support** SPI Moly offers warranties on their products, and they have a reputation for customer service. If the part fails prematurely, you may have recourse for replacement or refund.

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1. **Cost** Aftermarket parts like the SPI Moly A-arm are significantly more expensive than OEM (Original Equipment Manufacturer) replacements. For a 2012-2014 Polaris 800, the price can range from **$200 to $400 **, depending on availability and retailer markup. This may not be justified if your stock A-arm is still in good condition.

2. **Potential Overkill for Mild Use** If you primarily ride on smooth trails or pavement, the benefits of the SPI Moly A-arm may not be noticeable enough to warrant the expense. Stock A-arms are adequate for casual or light off-road use.

3. **Installation Complexity** While SPI Moly parts are generally user-friendly, installing an A-arm may require removing the wheel, adjusting suspension settings, and ensuring proper alignment. If you re not mechanically inclined, you may need to pay a shop for labor, adding to the cost.

4. **Compatibility Issues** Ensure the SPI Moly part is **exactly** compatible with your model year (2012-2014) and variant (SwitchBack Assault). Mixing parts from different years or models can lead to fitment problems, such as misalignment or difficulty installing other components (e.g., shocks, forks).

5. **Limited Long-Term Data** While SPI Moly has a good reputation, long-term reliability data for this specific part on the Polaris 800 may be limited compared to more widely used aftermarket brands (e.g., Yeti, Ohlsson, or Fox). Some riders report that certain aftermarket A-arms develop fatigue or bending over time, especially under heavy loads.

6. **Suspension Interaction** Upgrading A-arms can sometimes create tension with your suspension setup. For example, if you ve lowered your suspension or run stiffer shocks, the new A-arm might cause binding or reduced travel. You may need to adjust sag or preload to compensate.

7. **Resale Value Impact** Aftermarket modifications can sometimes deter buyers who prefer stock or easily replaceable parts. If you plan to sell the bike later, the SPI Moly A-arm may not add to its resale value and could even slightly reduce it for some buyers.

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### **Conclusion and Recommendation**

The **SPI Moly Upper A-Arm (2551-S332943-31)** is a solid upgrade for riders who prioritize **comfort, durability, and handling** on aggressive terrain. It s particularly worthwhile if:

- You frequently ride on rough or technical trails where vibration and harshness are major concerns.

- Your stock A-arm is bent, cracked, or showing signs of wear.

- You re already investing in other performance upgrades (e.g., suspension, tires, or exhaust) and want consistent improvements.

- You value the brand s reputation for quality and support.

- You ride mostly on smooth trails or pavement.

- Your stock A-arm is still functional and in good condition.

- You re on a tight budget and can t justify the cost without clear benefits.

- You re unsure about installation or alignment adjustments.

- **Skip the upgrade** if you re a casual rider or your stock A-arm is fine. The cost may not be justified for minimal gains.

- **Consider the upgrade** if you re aggressive rider, notice excessive vibration, or are already modifying your bike for performance. Pair it with a **suspension tune** (e.g., adjusting sag or preload) to ensure optimal results.

- **Test before committing** If possible, borrow or rent a bike with similar aftermarket A-arms to see if the difference is noticeable for your riding style.

- **Buy from a reputable dealer** Ensure the part is genuine and check for any recalls or fitment warnings specific to your model.

**Final Verdict:** The SPI Moly A-arm is a **good investment for serious riders** who want to enhance comfort and durability, but it s **not essential** for light-use or stock-condition bikes. Weigh the cost against your riding needs before purchasing.

Details:

Compatibility: Years: Make: model: Application: Notes: 2012 - 2014 Polaris800 , 2014 2017 Polaris550 INDY Left, 2013 2017 Polaris600 INDY SP Left, 2014 Polaris600 SP LE Left, 2013 Polaris600 Rush Left, 2016 Polaris800 144Left, SwitchBack Assault 2013 Polaris800 LE Left. This is helpful if you are buying multiple items.: Brand: Sports Parts Inc, model Number: 2551-S332943-31. I need to exchange an item.

Parts without fitment are to be assumed universal and may require vehicle modification. SPI Chrome Moly Upper A-Arm-Black for 2012 - 2014 Polaris 800 SwitchBack Assault 144 Snowmobile Left: Application: Left.

part #: 2551s33294331 price

• $78.16

specifications snowmobileshocksoi:

• for models: 800, Switchback, Assault
• for makes: Polaris
• for years: 2012-2014
• brand: Sports Parts Inc
• mpn: 2551-s332943-31
• part type: Arm

shipping snowmobileshocksoi:

• class: Standard
• cost: $0.00
• type: Fixed
• transit: 2-6 Days
• service: Standard

seller snowmobileshocksoi:

• # reviews: 85101
• rating: 99.9%
• city: Indiana, US

returns snowmobileshocksoi:

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

offer snowmobileshocksoi:

• quantity: 9
• availability: In Stock
• sold: 0
• options: Ship-to-home
• started: May 12, 2026

payments snowmobileshocksoi:

• wallet: Google-pay
• credit card: Diners-club
• other

general snowmobileshocksoi:

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

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