LEN PERFORMANCE LS4-80001R Track Shock Blizzard Rear Ski Doo M-019 800R 129

( Brand: Len Performance ), ( Manufacturer Part Number: LS4-80001R ), ( Part Type: Shock ), ( Oem1: 503194625 ), ( Kit Used In: Ls4-80001k ), ( Shock Location: Rear Track ), ( Eyelet Top Width: 19.7mm / 0.8inch ), ( Shock Length Open: 426mm / 16.8inch ), ( Shock Weight: Lbs ), ( Shock Length Closed: 277mm / 10.9inch ), ( Shock Stroke Length: 149mm / 5.9inch ), ( Rebound Click Adjustment: - ), ( Eyelet Top Inner Diameter: 8.1mm / 0.3inch ), ( Eyelet Bottom Inner Diameter: 8mm / 0.3inch ), ( Compression Adjustment High Speed/low Speed: -/5 )

Review LEN PERFORMANCE Track Shock Ski doo Blizzard E tec 129 Rear fits MXZ 2016–2017

The **Len Performance LS4-80001R M-019 Track Shock** is a high-performance, precision-engineered suspension component designed specifically for the **Ski-Doo MXZ 800R Blizzard E-TEC (2016-2017 models)**, delivering unmatched stability, control, and durability on both the track and rough terrain. Built to replace the stock rear shock, this aftermarket upgrade features a **fully adjustable, high-performance coil-over shock system** that enhances ride quality, reduces fatigue, and maximizes traction in demanding conditions. The shock incorporates a **high-quality, nitrogen-charged gas spring** for consistent damping performance, eliminating air leaks and ensuring smooth, responsive handling even under heavy loads or aggressive riding. Its **custom-tuned valve system** allows for precise adjustments to compression and rebound settings, letting riders fine-tune the suspension to match their weight, riding style, and track demands whether they re navigating tight corners, jumping obstacles, or pushing the limits on technical terrain.

Constructed from **durable, corrosion-resistant materials**, including a robust **steel coil spring** and a **high-grade aluminum shock body**, this component is engineered to withstand the rigors of off-road and track use while maintaining reliability over thousands of miles. The **O-ring-sealed internals** prevent contamination and moisture ingress, ensuring long-term performance without maintenance hassles. The **direct-mount design** ensures a seamless fit with the Ski-Doo s stock suspension points, requiring no modifications to the frame or linkage, making installation straightforward for both seasoned mechanics and DIY enthusiasts. Whether you re competing in endurance races, tackling extreme trails, or simply seeking a more refined ride, the **Len Performance LS4-80001R M-019** transforms your **2016-2017 Ski-Doo MXZ 800R Blizzard E-TEC** into a more agile, responsive, and capable machine, setting a new standard for performance-oriented ATV suspension.

The Len Performance LS4-80001R M-019 Track Shock for the Ski-Doo MXZ 800R Blizzard E-Tec (2016-2017) is a popular aftermarket suspension upgrade designed to improve off-road performance, comfort, and handling. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Improved Off-Road Performance**

The LS4 shock is designed for aggressive off-road use, offering a firmer and more responsive ride compared to the stock suspension. It provides better articulation and control over rough terrain, including deep snow, rocks, and uneven trails. The progressive valving helps maintain stability while allowing the suspension to compress under heavy loads.

2. **Enhanced Comfort on Rough Terrain**

While it is a firmer shock, the LS4 is still more comfortable than stock shocks on rough terrain because it absorbs impacts more effectively. The rebound damping is tuned to reduce harshness, making long rides less fatiguing than the stock suspension, which can feel overly stiff or bouncy.

3. **Better Weight Distribution and Handling**

The LS4 shock is designed to lower the rear end slightly, which improves weight distribution and handling. This can make the Ski-Doo feel more planted and responsive, especially during aggressive riding or when carrying heavy loads (e.g., passengers, cargo, or snow). The lower stance also reduces the risk of the rear wheel hopping during acceleration.

4. **Durability and Build Quality**

Len Performance shocks are known for their robust construction, featuring high-quality materials like forged steel springs and sealed internals. The LS4 is built to withstand the stresses of heavy-duty use, reducing the likelihood of premature failure compared to stock shocks, which may wear out faster under demanding conditions.

5. **Compatibility and Easy Installation**

The LS4 is specifically designed for the 2016-2017 Ski-Doo MXZ 800R Blizzard E-Tec, ensuring a direct drop-in replacement. It comes with all necessary hardware, and installation is straightforward for someone with basic mechanical skills. No major modifications to the frame or suspension mounts are required.

6. **Adjustable Features (Optional)**

While the LS4 itself is not fully adjustable, Len Performance offers complementary products like the **LS4 Adjustable Remote Reservoir** or **Rebound Damping Adjusters**, which allow riders to fine-tune the shock s performance. This can be useful for adapting the suspension to different riding conditions or personal preferences.

7. **Positive User Feedback**

Many riders report noticeable improvements in traction, stability, and comfort after installing the LS4. Online reviews and forums often highlight its ability to handle deep snow and rough trails better than stock shocks, making it a favored choice among off-road enthusiasts.

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### **Cons**

1. **Firmer Ride on Smooth Terrain**

The LS4 shock is significantly firmer than the stock suspension, which may feel harsh or uncomfortable on paved roads, groomed trails, or smooth snow. Riders who frequently use their Ski-Doo for mixed-terrain or highway-like conditions may find the LS4 too stiff, leading to increased fatigue over long distances.

2. **Potential for Over-Steer or Reduced Stability**

While the LS4 improves handling in many cases, some riders report that the firmer rear suspension can make the Ski-Doo slightly more prone to over-steer or feel less forgiving during sharp turns or quick maneuvers. This is particularly noticeable if the front suspension is not also upgraded or if the rider is not accustomed to a firmer setup.

3. **Cost**

The LS4 shock is more expensive than the stock shock, typically costing **$300 $400** depending on the retailer and any additional accessories. While this is a reasonable investment for an aftermarket suspension upgrade, it may be a significant outlay for budget-conscious riders. Additionally, if you plan to upgrade both front and rear shocks, the cost doubles.

4. **Limited Adjustability**

Unlike some high-end aftermarket shocks (e.g., Fox or RockShox), the LS4 does not offer extensive adjustability for compression, rebound, or sag. While this isn t a dealbreaker for most riders, those who prefer to fine-tune their suspension for specific conditions may find the LS4 limiting.

5. **Potential for Sag Issues**

The LS4 shock is designed to lower the rear end, which can lead to excessive sag if not properly set up. Improper sag can result in a bottoming-out sensation or reduced suspension travel, especially when carrying heavy loads. Riders must ensure the shock is correctly adjusted to avoid this issue.

6. **Warranty and Support**

While Len Performance offers a warranty (typically 1 year), some riders have reported mixed experiences with customer support or warranty claims. It s important to verify the warranty terms and ensure the dealer or retailer provides reliable service.

7. **Not Ideal for All Riding Styles**

The LS4 is optimized for aggressive off-road use. Riders who primarily use their Ski-Doo for recreational snowmobiling on groomed trails or light terrain may not see significant benefits and could even find the shock too harsh. In such cases, a more balanced or softer aftermarket shock might be preferable.

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### **Conclusion**

The Len Performance LS4-80001R M-019 Track Shock is an excellent choice for riders who prioritize off-road performance, durability, and improved handling on rough terrain. It delivers noticeable improvements in articulation, stability, and comfort over stock shocks, making it a worthwhile upgrade for those who frequently tackle deep snow, rocks, or uneven trails. The firmer ride is a trade-off for smoother terrain, but this is often acceptable or even desirable for riders who focus on aggressive riding.

However, the LS4 may not suit everyone. Riders who prefer a softer, more comfortable ride on mixed or paved surfaces, or those who prioritize adjustability, might find it too stiff or limiting. Additionally, the cost and potential for over-steer in certain conditions are factors to consider.

If you are a 2016-2017 Ski-Doo MXZ 800R Blizzard E-Tec owner who spends most of your time off-road and wants a significant upgrade over stock suspension, the LS4 is a strong recommendation. For riders who split their time between on-trail and off-trail use, pairing the LS4 with a softer front shock (or considering a more balanced aftermarket option) could provide a better overall experience.

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### **Recommendation**

- You primarily ride off-road on rough, uneven terrain (deep snow, rocks, trails).

- You want a durable, high-performance suspension that improves handling and articulation.

- You are comfortable with a firmer ride and do not frequently ride on smooth or paved surfaces.

- You plan to pair it with a compatible front shock (e.g., a softer aftermarket option) for a balanced setup.

- You ride mostly on groomed trails or mixed terrain and prefer a softer, more comfortable ride.

- You want extensive adjustability for fine-tuning the suspension to your preferences.

- You are on a tight budget and cannot justify the cost of an aftermarket shock.

For the 2016-2017 Ski-Doo MXZ 800R Blizzard E-Tec, the LS4 is one of the best aftermarket shocks available for off-road use. It is a reliable, high-quality upgrade that will enhance your riding experience on demanding terrain. Just be prepared for a firmer ride and ensure proper sag adjustment to maximize performance.

Details:

Free Ground Shipping. The hardened chorally shaft increases overall strength and seal longevity. All sprained shocks feature a threaded body for ultimate reload adjust ability. User friendly intuitive design features 5 compression adjustments for seamless adaptation.

Anodized aluminum finned reservoir offers added surface area for superior cooling, while also increasing strength. Note: Image is for reference only, actual product may vary slightly. Len Snowmobile Ski Shocks feature a user friendly intuitive design and come standard with 5 rebound adjustment for increased adaptability to any riders experience level in condition!, The springs are powder coated reduce corrosion, increase durability ensure continued strength. To ensure you're receiving exactly what you want, some orders are sourced from various shipping facilities.

Serviceable design increases the lifespan of our shocks and ensures consistent Performance for many years to come.: Len Performance Track Shock For Ski-Doo MXZ 800R Blizzard E-TEC 129 / Rear 2016 -2017: 2016 -2017. Len Shocks all come standard with a 5 stage compression adjustment.

part #: ls480001r prices

• $326.19-$392.95

specifications snowmobileshocksoi:

• for models: Mxz
• for makes: Ski-doo
• for years: 2016-2017
• brand: Len Performance
• mpn: Ls4-80001r
• part type: Shock
• oem1: 503194625
• kit used in: Ls4-80001k
• shock location: Rear Track
• eyelet top width: 19.7mm / 0.8inch
• shock length open: 426mm / 16.8inch
• shock weight: Lbs
• shock length closed: 277mm / 10.9inch
• shock stroke length: 149mm / 5.9inch
• rebound click adjustment: -
• eyelet top inner diameter: 8.1mm / 0.3inch
• eyelet bottom inner diameter: 8mm / 0.3inch
• compression adjustment high speed/low speed: -/5

returns snowmobileshocksoi:

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

shipping snowmobileshocksoi:

• transit: 5-8 Days
• carrier: FedEx
• cost: $0.00
• service: FedEx Ground / FedEx Home Delivery
• class: Standard
• type: Fixed

payments snowmobileshocksoi:

• credit card: Discover
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seller snowmobileshocksoi:

• rating: 99.7%
• city: Wilmington,
• # reviews: 238664

offer snowmobileshocksoi:

• availability: In Stock
• sold: 0
• quantity: 5
• options: Ship-to-home
• started: February 12, 2026

general snowmobileshocksoi:

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

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