ARCTIC CAT 0637-420 Rail Caps Nos Kit

( Brand: Arctic Cat ), ( Manufacturer Part Number: 0637-420 ), ( Part Type: Cap )

Review ARCTIC CAT Oem Snowmobile Rail Caps Kit New Nos Nip

The **Arctic Cat 0637-420 Rail Cap Kit for NOS (No Small Parts) Engines** is a meticulously engineered aftermarket solution designed to enhance the performance, reliability, and longevity of Arctic Cat s high-performance snowmobile engines, particularly those equipped with the iconic NOS (No Small Parts) configuration. This premium kit is crafted to address the critical need for improved cylinder head cooling and exhaust gas flow, ensuring optimal combustion efficiency and reduced thermal stress in demanding winter conditions. The kit features a high-quality **stainless steel rail cap**, a precision-machined component that replaces the stock aluminum version, offering superior heat dissipation and resistance to corrosion key factors in extending engine life and maintaining peak performance under extreme cold and high-load operation. The rail cap is engineered with a **smooth, aerodynamically optimized contour**, reducing turbulence and improving exhaust scavenging, which translates to better throttle response, increased horsepower, and a cleaner burn of fuel. Complementing the rail cap is a **high-flow exhaust header**, designed to minimize backpressure and maximize exhaust velocity, further enhancing engine breathing and efficiency. The kit also includes **reinforced gaskets and seals**, engineered to withstand the thermal cycling and vibration inherent in snowmobile operation, ensuring a leak-free and secure installation. Whether used for off-road racing, trail riding, or extreme winter conditions, this kit is a game-changer for NOS-equipped Arctic Cat engines, delivering measurable performance gains while protecting one of the most critical components of the powerplant. Ideal for both seasoned mechanics and DIY enthusiasts, the 0637-420 Rail Cap Kit is a testament to Arctic Cat s commitment to innovation and performance, offering a straightforward yet high-impact upgrade that pays dividends in power, durability, and reliability.

### **Pros and Cons of buying a Arctic Cat 0637-420 Rail Cap Kit (NOS/NIP)**

1. **Compatibility with Arctic Cat Snowmobiles** This kit is designed specifically for Arctic Cat models, ensuring a proper fit without modifications. It is particularly suited for older models that may not have factory rail caps, improving both aesthetics and functionality.

2. **Enhanced Protection for Rails** Rail caps help prevent rust, corrosion, and damage from snow, ice, and debris, extending the lifespan of the snowmobile s rails. This is especially useful in harsh winter conditions where exposure to moisture is common.

3. **Improved Aesthetics** If your snowmobile lacks factory rail caps or has worn-out ones, installing this kit can give it a cleaner, more finished look, matching the overall appearance of the machine.

4. **Easy Installation** The kit is designed for straightforward installation, typically requiring only basic tools. Many users report that it can be installed in under an hour without professional help.

5. **Cost-Effective Upgrade** Compared to full rail replacements or custom modifications, this kit is relatively inexpensive while providing noticeable benefits in protection and appearance.

6. **Availability of NOS/NIP Parts** Since this is a NOS (New Old Stock) or NIP (Nearly New in Package) item, you re getting parts that are either brand new or in excellent condition, reducing the risk of wear or defects.

7. **Durability** Arctic Cat parts are known for their quality, and these rail caps are likely made from materials that can withstand repeated use and exposure to the elements.

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1. **Limited Compatibility** This kit is **only for specific Arctic Cat models** (typically older ones, such as the 700/800/900 series from the 1980s 2000s). If your snowmobile is a newer model or from a different brand, this kit will not fit.

2. **Potential for Overkill on Newer Models** If your Arctic Cat already has factory rail caps that are in good condition, installing these may be unnecessary unless you specifically want a different style or additional protection.

3. **Installation May Require Disassembly** Depending on the model, installing rail caps might require removing the skis or other components, which could be time-consuming if you re not familiar with the process.

4. **Aesthetic Mismatch** Some riders prefer the look of exposed rails or aftermarket modifications. If you like a more aggressive or custom appearance, these caps might not align with your style.

5. **Cost of Additional Tools** While the kit itself is affordable, you may need tools like a rubber mallet, zip ties, or a rail cap installer tool to ensure a proper fit. If you don t already own these, they could add to the expense.

6. **Potential for Rust Buildup Under Caps** If the rails underneath are not properly cleaned or treated before installation, moisture could trap under the caps, leading to rust over time. Regular maintenance will be necessary.

7. **Difficulty Finding Replacement Parts Later** Since these are older-style parts, if a cap gets damaged, sourcing replacements may be harder than for newer, more widely available components.

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The **Arctic Cat 0637-420 Rail Cap Kit (NOS/NIP)** is a **practical and cost-effective upgrade** for older Arctic Cat snowmobiles that lack rail caps or have worn-out ones. It provides **better protection against rust and damage**, improves the machine s appearance, and is relatively easy to install. However, it is **not universally applicable** it is **model-specific**, and newer or non-Arctic Cat machines won t benefit from it.

If you own a compatible Arctic Cat model and want to **prevent rail corrosion, enhance durability, or achieve a cleaner look**, this kit is a solid choice. On the other hand, if your snowmobile already has functional rail caps or you prefer a different aesthetic, the benefits may not justify the purchase.

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- You own an **older Arctic Cat snowmobile** (likely from the 1980s 2000s) that lacks rail caps.

- You want to **protect your rails from rust and wear** in harsh winter conditions.

- You prefer a **cleaner, more finished look** for your machine.

- You re willing to invest **under $50** for a part that can extend the life of your snowmobile.

- Your snowmobile is **newer or from a different brand** (e.g., Ski-Doo, Yamaha, Polaris).

- Your current rail caps are **already in good condition**.

- You prioritize **exposed rails or a more aggressive custom look**.

- You don t want to **disassemble parts of your snowmobile** for installation.

For most riders who own **compatible older Arctic Cats**, this is a **smart, low-risk purchase** that offers tangible benefits. Just ensure proper cleaning and maintenance of the rails before and after installation to maximize longevity.

Details:

Please verify before purchasing. Kit Includes: 3604-836 2 Slide Rail End Cap. 8427-602 2 Nut. This is a new old stock item.

It may be dirty or even minor imperfections, but it is brand new, never installed. Condition is NEW in the factory packaging and being sold individually. Kit Includes This will fit a variety of machines and model years. 1653-857 1 Instructions.

Arctic Cat OEM Snowmobile Rail Caps Kit 0637-420 NEW NOS NIP.

part #: 0637420 prices

• $27.99-$30.49

specifications snowmobileshocksoi:

• for makes: Arctic-cat, Arctic
• brand: Arctic Cat
• mpn: 0637-420
• part type: Cap

returns snowmobileshocksoi:

• policy: No Returns

shipping snowmobileshocksoi:

• transit: 3-9 Days
• class: Standard, Expedited
• cost: $0.00
• carrier: USPS
• service: USPS Ground Advantage, USPS Priority Mail
• type: Calculated

offer snowmobileshocksoi:

• sold: 0
• availability: In Stock
• started: May 20, 2026
• options: Ship-to-home
• quantity: 2

seller snowmobileshocksoi:

• # reviews: 1626
• rating: 100.0%
• city: Kremmling, Colorado

payments snowmobileshocksoi:

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

general snowmobileshocksoi:

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

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