SPORTS PARTS INC 6340-S448521-40 Spi Moly Lower Arm Left Ski Doo

( Brand: Sports Parts Inc ), ( Manufacturer Part Number: 6340-S448521-40 ), ( Part Type: Arm )

Review SPORTS PARTS INC Spi Chrome Moly Lower A arm black Ski doo Limited Left fits GSX 600 2005

The **SPI Moly Lower A-Arm (Part #6340-S448521-40) in Black** is a high-performance, precision-engineered suspension component designed exclusively for the **2005 Ski-Doo GSX 600**, specifically the left-side lower control arm. Crafted from durable, high-grade **7075-T6 aluminum**, this aftermarket part delivers an optimal balance of strength, rigidity, and weight savings, ensuring superior handling and responsiveness compared to the stock OEM component. The **black anodized finish** not only enhances the aesthetic appeal of your Ski-Doo, giving it a sleek, modern look, but also provides an added layer of corrosion resistance, protecting against the elements during off-road adventures. This lower A-arm features **precisely machined mounting points** and **reinforced bushings**, which reduce flex and improve stability, allowing for better weight transfer and a more connected riding experience. Whether you're carving through tight trails, tackling rough terrain, or pushing the limits on the track, this upgraded part ensures a firmer, more predictable suspension setup. Ideal for riders seeking enhanced control and durability, the **SPI Moly Lower A-Arm** is a direct replacement for the stock component, requiring no modifications to fit seamlessly into your Ski-Doo s suspension system. Built to withstand the demands of aggressive riding, this part is a must-have for those looking to elevate their GSX 600 s performance while maintaining a clean, aggressive aesthetic.

### **Pros and Cons of buying a 6340-S448521-40 SPI Moly Lower A-Arm (Black) for a 2005 Ski-Doo GSX 600 Left**

1. **Improved Durability** SPI Moly coatings are known for reducing wear and tear on suspension components, extending the lifespan of your lower A-arm compared to standard parts.

2. **Reduced Friction and Heat** The molybdenum disulfide (Moly) coating provides a low-friction surface, which can help prevent premature failure from heat buildup, especially in aggressive or off-road riding conditions.

3. **Better Performance** A well-maintained lower A-arm ensures smoother suspension action, which can enhance handling, stability, and overall ride quality.

4. **Compatibility** This part is specifically designed for the 2005 Ski-Doo GSX 600, ensuring a proper fit without modifications.

5. **Cost-Effective Upgrade** Compared to full suspension rebuilds or aftermarket suspension kits, this is a relatively inexpensive way to improve suspension reliability.

6. **Easier Maintenance** The Moly coating may reduce the need for frequent lubrication, making future servicing simpler.

7. **Black Finish** The black color matches the stock aesthetic of the GSX 600, avoiding the need for additional painting or modifications.

1. **Price Premium** While not excessively expensive, the SPI Moly version is more costly than a standard OEM or aftermarket lower A-arm without the coating.

2. **Limited Availability** Finding this exact part may require special ordering, especially if you re not purchasing directly from Ski-Doo or an authorized dealer.

3. **Installation Complexity** Replacing a lower A-arm requires removing the wheel, suspension components, and possibly the subframe, which may be challenging for inexperienced DIYers.

4. **Mixed Reviews on Longevity** Some riders report that while the Moly coating helps, it doesn t eliminate the need for eventual replacement due to wear from impacts or heavy use.

5. **Potential for Counterfeit Parts** If purchasing from a third-party seller, there s a risk of receiving a fake or low-quality SPI Moly part, so sourcing from a reputable dealer is crucial.

6. **No Guarantee of Performance Gains** If the rest of the suspension (shocks, bushings, etc.) is worn, replacing just the lower A-arm may not yield significant improvements.

7. **Weight Consideration** The Moly coating adds slight weight, though the difference is negligible compared to other suspension components.

---

### **Conclusion and Recommendation**

The **6340-S448521-40 SPI Moly Lower A-Arm** is a solid upgrade for a **2005 Ski-Doo GSX 600**, particularly if you prioritize durability, reduced friction, and long-term suspension reliability. The Moly coating provides a tangible benefit over standard parts, making it a worthwhile investment if you plan to keep the bike for several years or ride aggressively.

- You re experiencing suspension issues (excessive play, rattling, or premature wear).

- You want to extend the life of your lower A-arm without a full suspension overhaul.

- You re comfortable with the installation process or have access to a mechanic.

- You re purchasing from a trusted dealer to avoid counterfeit parts.

- Your suspension problems stem from other components (e.g., worn shocks, bushings, or steering stem).

- You re on a tight budget and can t justify the extra cost over a standard part.

- You re not confident in your ability to install it correctly, as improper fitting could lead to handling issues.

**Final Verdict:** For most **2005 GSX 600 owners** looking to maintain or upgrade their suspension, this is a **reliable and practical choice**, especially if combined with other maintenance (e.g., fresh bushings, shocks, and lubrication). If you re unsure, consider inspecting your current lower A-arm if it s visibly worn or damaged, replacing it with the SPI Moly version is a smart move. If the issue is minor, a standard part may suffice.

Details:

Brand: Sports Parts Inc, model Number: 6340-S448521-40. This is helpful if you are buying multiple items. Replacement Chrome Moly Lower A-Arm manufactured by Sports Parts. 2005 - Ski-Doo GSX 600 Limited Left.

I need to exchange an item. Parts without fitment are to be assumed universal and may require vehicle modification. SPI Chrome Moly Lower A-Arm-Black for 2005 Ski-Doo GSX 600 Limited Left: Application: Left. 2005 - Ski-Doo GSX 550 Fan Left.

part #: 6340s44852140 price

• $92.32

specifications snowmobileshocksoi:

• for models: Gsx, 600
• for makes: Ski-doo
• for years: 2005
• brand: Sports Parts Inc
• mpn: 6340-s448521-40
• part type: Arm

shipping snowmobileshocksoi:

• cost: $0.00
• class: Standard
• service: Standard
• transit: 3-5 Days
• type: Fixed

returns snowmobileshocksoi:

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

general snowmobileshocksoi:

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

seller snowmobileshocksoi:

• # reviews: 84973
• rating: 99.9%
• city: Indiana, US

offer snowmobileshocksoi:

• options: Ship-to-home
• quantity: 9
• sold: 0
• started: May 10, 2026
• availability: In Stock

payments snowmobileshocksoi:

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

Sports Parts Inc 6340-S448521-40 Is Similar To:

• 01-154-16 Sports Parts Inc Voltage Regulator (32.4% similar) Replaces all selenium metal plate and silicon rectifiers. Output current. 12 volt 200 watt or less. Replaces regulators used on arctic cat, Kawasaki, Krupp, scorpion, ski-doo, and others. Protects batteries, lights, and complete electrical systems...(March 11th, 2017)
• 01-154-21c Sports Parts Inc Voltage Regulator (32.2% similar) ...(March 10th, 2017)
• 02-114-03 Sports Parts Inc Sport Exhaust Ball Joint Assembly (29.3% similar) Exhaust ball joint assembly heavy-duty construction. Return items must be in original manufacturers packaging. Thickness shipping free ground in the 48 contiguous us states only, and only for items marked as. Keep all packaging materials and the original shipping box. All tags, labels and stickers ...(September 7th, 2018)
• 04-130-05 Sports Parts Inc Spi Spring Adj Bolt Arctic (36.9% similar) Your friends at classic cycle Parts appreciate business...(January 26th, 2019)
• 04-130-06 Sports Parts Inc Track Adjustment Screw 779422123818 (31.3% similar) on the continent of north America. Actual product may differ from the item shown in photograph. Photos are for reference only...(July 28th, 2018)
• 04-229-010 Sports Parts Inc Cross Shaft (33.6% similar) Photos and fitment chart are for reference may be slightly different every application. The photo fitment chart may also not show everything that is Included...(February 15th, 2019)
• 04-256-su-04055 Sports Parts Inc Spi (28.6% similar) Spi shocks are designed to work with oem bushings, springs and collars. Check price list for special dealer pricing warning: photos may be generic or approximations, if you are unsure about what purchasing please before order. For bushing, spring and collar info see page. Id: Si mfg price: 96. Never...(April 22nd, 2017)
• 04-273 Sports Parts Inc Spi (30.5% similar) ...(December 18th, 2017)
• 04-295 Sports Parts Inc Spi Spring For Susp Shock (39.2% similar) This occasionally happens, and is rare. Expedited shipping via USPS priority mail with delivery confirmation is available...(July 11th, 2018)
• 04-296-05 Sports Parts Inc Shock Collar For Springs (38.7% similar) Shock collar for bushings, springs and collars dagger check for special dealer pricing replacement bushing kit '98-02 STX, '00-03 500R 600R 700R, '98-99 Max DLX sx Tc. Springs spi shocks are designed to work with...(September 27th, 2018)
• 04-297-02 Sports Parts Inc Arctic Cat Spring Retainers Crossfire Cc Up (31% similar) They may have repairs. Please look at all the pictures and read whole. Oem original equipment manufacturer which may be new or used items for that machine. Not asking questions, gets you the wrong part every time guaranteed. As this stops us from selling the item to someone else who needs. Shipping ...(August 13th, 2018)