SP1 3903-S461647-33 Moly Upper Arm Ski Doo

( Brand: Sp1 ), ( Manufacturer Part Number: 3903-S461647-33 ), ( Part Type: Arm )

Review SP1 Chrome Moly Upper A arm black Ski doo X rs E tec fits RENEGADE RS 850 2018–2021

The **SP1 3903-S461647-33 Moly Upper A-Arm (Black)** is a high-performance, precision-engineered suspension component designed exclusively for the **2018 2021 Ski-Doo Renegade X-RS E-TEC 850**, ensuring optimal handling, durability, and off-road capability. Crafted from **high-grade, heat-treated steel**, this upper A-arm is treated with a **molybdenum (moly) coating**, a proprietary process that enhances its resistance to wear, corrosion, and fatigue while reducing friction between moving parts. The moly treatment not only extends the lifespan of the component but also improves its performance under extreme conditions, making it ideal for aggressive riding, deep mud, and rough terrain where standard suspension parts may fail prematurely.

The **black powder-coated finish** provides both an aesthetic upgrade and added protection against the elements, preventing rust and abrasion from dirt, salt, or debris. Unlike stock OEM parts, this aftermarket A-arm is **engineered for superior strength and flexibility**, allowing for better articulation and load-bearing capacity, which translates to improved traction, stability, and a more responsive ride. Whether tackling steep climbs, navigating tight switchbacks, or pushing through dense brush, this upper A-arm delivers the structural integrity and smooth operation needed to keep up with the demands of the X-RS s high-performance powertrain.

Compatibility is a key feature of this part, as it is **directly interchangeable** with the original equipment, requiring no modifications to the suspension system. The **precision-machined design** ensures a perfect fit with the Renegade s steering linkage, reducing play and enhancing steering precision. For riders who demand the best in both performance and longevity, this moly-treated upper A-arm is a **game-changer**, offering a noticeable improvement over stock components while maintaining full compatibility with the vehicle s factory suspension setup. Whether you're a weekend warrior or a serious off-road enthusiast, this component is a **must-have upgrade** for those seeking to maximize the potential of their Ski-Doo Renegade X-RS E-TEC 850.

### **Pros and Cons of buying a SP1 3903-S461647-33 Moly Upper A-Arm (Black) for a 2018-2021 Ski-Doo Renegade X-RS E-TEC 850**

1. **Improved Durability and Strength** The molybdenum (moly) coating on this upper A-arm enhances resistance to wear, corrosion, and fatigue, extending the lifespan of the component compared to standard steel parts.

2. **Reduced Friction and Smoother Operation** The moly coating provides a low-friction surface, which can help reduce binding and improve articulation in the suspension, leading to a smoother ride.

3. **Better Heat Resistance** Molydenum is known for its ability to withstand higher temperatures without degrading, which can be beneficial in high-performance or aggressive riding conditions where heat buildup is a concern.

4. **Compatibility with Aftermarket Modifications** Since this is an OEM-style part (with a moly finish), it is designed to fit directly into the stock suspension system without requiring modifications, making it a straightforward upgrade.

5. **Aesthetic Appeal** The black finish matches the stock color scheme of the Renegade X-RS, providing a clean, factory-like look without the need for additional painting or coating.

6. **Potential Performance Gains** A well-maintained suspension system with moly-coated components can improve handling, especially in rough terrain, by reducing internal resistance in the suspension linkage.

7. **Easier Maintenance** The moly coating can make cleaning and inspection of the A-arm easier, as it resists rust and grime buildup better than untreated steel.

---

1. **Cost** Moly-coated parts are generally more expensive than standard steel or painted components. While the price may be justified for performance gains, it can be a significant investment if upgrading multiple suspension parts.

2. **Limited Availability and Lead Times** Specialty-coated parts like this may not be as widely stocked as standard suspension components, potentially requiring special ordering or longer wait times.

3. **Potential Overkill for Mild Use** If you primarily ride on smooth trails or roads and do not push the suspension hard, the benefits of moly may not be noticeable enough to justify the cost.

4. **Installation Complexity** While the part is designed to fit stock, removing and installing an A-arm may still require some mechanical skill, especially if other suspension components (like bushings or shocks) are worn and need attention.

5. **Durability Trade-Offs** While moly improves wear resistance, it does not make the part indestructible. Extreme impacts (e.g., heavy off-roading or crashes) can still damage the A-arm, and the moly coating may wear off over time with heavy use.

6. **Compatibility with Non-OEM Suspension** If you plan to modify the suspension further (e.g., with aftermarket shocks or linkages), ensure that this part will still work seamlessly with those changes, as some aftermarket components may have different mounting requirements.

7. **Resale Value Impact** While moly parts are durable, they may not significantly boost resale value, as most buyers prioritize the overall condition of the vehicle over specific suspension upgrades.

---

The **SP1 3903-S461647-33 Moly Upper A-Arm** is a solid upgrade for owners of the 2018-2021 Ski-Doo Renegade X-RS E-TEC 850 who prioritize **durability, reduced friction, and potential performance improvements**. It is particularly worthwhile if you:

- Ride aggressively or on rough terrain.

- Want to extend the life of your suspension components.

- Prefer a high-quality, low-maintenance part that matches the stock finish.

However, if you are on a tight budget or ride mostly on smooth trails, the benefits may not be significant enough to justify the cost. In such cases, a standard replacement A-arm or focusing on other high-wear parts (like bushings or shocks) could be a more cost-effective approach.

---

- You are upgrading your suspension for better longevity and performance.

- You plan to keep the ATEC 850 for several years and want to minimize wear on critical components.

- You are already investing in other suspension or performance modifications (e.g., shocks, bushings, or track bars).

- You are on a limited budget and can achieve similar results with a standard replacement part.

- Your riding style is mostly casual or road-focused, where the benefits of moly are minimal.

- You are unsure about your mechanical ability to install it properly, as improper handling could lead to further issues.

**Final Verdict:** This is a **high-quality, justified upgrade** for serious riders who want to future-proof their suspension. Pair it with other moly-coated parts (if available) for the best results. If you decide to proceed, ensure you also inspect and replace any worn bushings or shocks to maximize the upgrade s effectiveness.

Details:

Brand: SP1, model Number: 3903-S461647-33. This is helpful if you are buying multiple items. 2018 - 2021 Ski-Doo Renegade X-RS E-TEC 850. 2018 - Ski-Doo Renegade Back country E-TEC 850.

Parts without fitment are to be assumed universal and may require vehicle modification. 2018 - 2021 Ski-Doo Renegade Adrenaline E-TEC 850. I need to exchange an item.

part #: 3903s46164733 price

• $84.97

specifications snowmobileshocksoi:

• for models: Rs, 850, Renegade
• for makes: Ski-doo
• for years: 2018-2021
• brand: Sp1
• mpn: 3903-s461647-33
• part type: Arm

returns snowmobileshocksoi:

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

general snowmobileshocksoi:

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

offer snowmobileshocksoi:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• quantity: 9
• started: May 22, 2026

seller snowmobileshocksoi:

• rating: 99.9%
• city: San Marcos, CA
• # reviews: 85734

shipping snowmobileshocksoi:

• service: Standard
• cost: $0.00
• type: Fixed
• class: Standard
• transit: 5-8 Days

payments snowmobileshocksoi:

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

Sp1 3903-S461647-33 Is Similar To:

• Sp1 Gas Ski Shock With Spring For Polaris Su-08251s (26% similar) SP1 shocks are designed to work with oem bushings, springs and collars. SP1 heated brake lever compatible with Yamaha SM-08585. K l carburetor boot/holder 11-4221. New condition...(May 30th, 2022)
• Sp1 Sm-08652l Chrome Moly Lower A-arm Black (44.9% similar) Photos are for reference only. Actual product may differ from the item shown in photograph. New condition...(June 4th, 2022)
• Sp1 Sm-08663r Chrome Moly Lower A-arms Black (47.5% similar) Photos are for reference only. Actual product may differ from the item shown in photograph. Compatible with ski-doo renegade back country x e-tec 850 2018 . Compatible with ski-doo renegade back country e-tec 850 2018 . New condition...(June 5th, 2022)
• Sp1 Sm-08674l Chrome Moly Lower A-arm Black (46.4% similar) Photos are for reference only. Actual product may differ from the item shown in photograph. Compatible with Polaris 800 Saks 155 2016 - 2017 . Compatible with Polaris 800 pro-Mk 174 Le 2017 . Compatible with Polaris 800 pro-Mk 163 Le 2017 . New condition...(June 22nd, 2022)
• Sp1 Sm-08684r Chrome Moly Upper A-arm Black (50.7% similar) Photos are for reference only. Actual product may differ from the item shown in photograph. Compatible with Polaris 800 switch back pro-x 2015 - 2017 . Compatible with Polaris 800 switch back pro-s Le 2017 . New condition...(June 24th, 2022)
• Sp1 Ski Stance Adjuster Sm-08330 (25.2% similar) Ski stance adjuster. 2019 - 2019 ski-doo renegade endure e-tec 600R. New condition...(June 28th, 2022)
• Sp1 Gas Suspension Shock Rear For Arctic Cat For Yamaha Su-04311 (26.4% similar) SP1 shocks are designed to work with oem bushings, springs and collars. New condition...(July 1st, 2022)
• Sp1 Gas Ski Shock With Spring S-d Su-08252s 54-11502s 128036 (24.2% similar) SP1 - SU-08252S - ski gas shock. Ski gas shock. New condition...(July 4th, 2022)
• Sp1 Sway Bar Disconnect For Polaris Sm-08452 (30.2% similar) Use your sway bar on the trail for increased control disconnect it when you get up on the mountain quick and significant suspension adjustment allows tighter bonding and easier sidling. New condition...(July 4th, 2022)
• Sp1 Sm-08673r Chrome Moly Lower A-arms Black (47.5% similar) Photos are for reference only. Actual product may differ from the item shown in photograph. Compatible with Polaris 850 Mk khans 155 3IN. Compatible with Polaris 850 Mk khans 155 2020 -2021. Compatible with Polaris 850 pro-Mk Axis 165 2.75IN. New condition...(July 18th, 2022)
• Sp1 08-472l Chrome Moly Lower A-arm Silver (49.6% similar) Photos are for reference only. Actual product may differ from the item shown in photograph. Compatible with arctic cat saber cat 600 2004 . Compatible with arctic cat saber cat 500 2004 -2005. Compatible with arctic cat crossfire r 8 Le 2009 . New condition...(July 23rd, 2022)