PRO X 28.SIS4406-2 Steel Intake Valve Spring Kit Atv Utv Valve/spring Atv/utv

( Brand: Pro X ), ( Part Type: Intake Valve Spring ), ( Manufacturer Part Number: 28.SIS4406-2 )

Review PRO X Steel Intake Valve/spring Kit Atv/utv

Introducing the SIS4406-2 Pro 28 ATV/UTV Intake Valve/Spring Kit from Moto Power Industries, a high-performance upgrade for your all-terrain vehicle or utility terrain vehicle. This comprehensive kit includes both intake valves and springs, ensuring a complete and effective solution for enhancing your engine's power and responsiveness.

The Pro 28 intake valves are meticulously crafted from premium SAE 4406-2 steel, a material renowned for its strength and durability. These valves have been designed to provide superior flow characteristics, allowing for increased volumetric efficiency and improved combustion. The result is a more potent engine that delivers enhanced power and torque across the entire RPM range.

The intake valve springs in this kit are engineered to match the strength and reliability of the valves themselves. Made from high-tensile, heat-treated steel, these springs offer the perfect balance of pressure and resilience to maintain optimal valve function under demanding conditions. The upgraded springs also provide better sealing against the valve seats, reducing the risk of leaks and ensuring consistent engine performance.

Installing the Pro 28 intake valve/spring kit in your ATV or UTV is a straightforward process, thanks to the inclusion of detailed installation instructions and high-quality hardware. Each kit comes complete with all necessary components, including new valve guides and seals, ensuring a seamless installation experience.

Upgrading your ATV or UTV with the Moto Power Industries Pro 28 SIS4406-2 intake valve/spring kit is an investment in both performance and longevity. By enhancing the flow and sealing capabilities of your engine's intake system, you'll experience improved power, torque, and overall engine responsiveness. Plus, the superior strength and durability of the SAE 4406-2 steel used in the construction of these components guarantees long-lasting performance, making this an essential upgrade for any serious off-road enthusiast.

Pros and Cons of Buying a 28mm SIS4406-2 Steel Intake Valve/Spring Kit for ATV/UTV

The 28mm SIS4406-2 steel intake valve/spring kit is a popular aftermarket upgrade for ATVs and UTVs. This kit offers several benefits, but like any modification, it comes with some drawbacks. In this analysis, we will discuss the pros and cons of investing in this kit.

1. Improved Performance: Steel intake valves are stronger and more durable than their stock counterparts. They can withstand higher engine temperatures and pressures, allowing for better performance and power output.

2. Enhanced Durability: The steel valves are less prone to wear and tear, reducing the need for frequent replacements. They can also resist corrosion, extending the life of the valves and reducing maintenance costs.

3. Better Throttle Response: The upgraded springs in the kit provide improved throttle response, allowing for quicker acceleration and smoother power delivery.

4. Increased Longevity: The steel valves and springs can help increase the overall longevity of the engine by reducing stress on other components.

1. Cost: The 28mm SIS4406-2 steel intake valve/spring kit can be quite expensive compared to stock parts.

2. Installation Complexity: Installing the kit requires a significant amount of skill and experience. It is not a simple bolt-on upgrade and may require professional assistance.

3. Potential Powerband Shift: Depending on the specific engine and application, the kit may cause a noticeable powerband shift, which could be a disadvantage for some riders.

4. Noise: The steel valves may produce more noise than stock valves, which could be a concern for those seeking a quieter ride.

The 28mm SIS4406-2 steel intake valve/spring kit offers several advantages, including improved performance, enhanced durability, better throttle response, and increased longevity. However, it also comes with some drawbacks, such as a high cost, installation complexity, potential powerband shift, and increased noise.

If you are looking for significant power gains and are willing to invest in a high-quality, durable upgrade, the 28mm SIS4406-2 steel intake valve/spring kit may be a worthwhile investment. However, if you are on a budget or are concerned about the installation complexity, you may want to consider alternative performance upgrades. Ultimately, the decision to purchase this kit should be based on your individual needs, preferences, and budget.

part # 28sis44062 prices

• $139.97-$166.95

specifications atvsienna:

• brand: Pro X
• part type: Intake Valve Spring
• manufacturer part number: 28.SIS4406-2

general atvsienna:

• ATV, Side-by-Side UTV Parts Accessories > Engines Engine Parts > Other Engine Parts
• condition: New

shipping atvsienna:

• class: Standard
• cost: $0.00
• transit: 4-9 Days
• type: Fixed
• service: Standard

offer atvsienna:

• options: Ship-to-home
• sold: 0
• started: November 29, 2025
• availability: In Stock
• quantity: 10

seller atvsienna:

• # reviews: 16590
• rating: 99.7%

returns atvsienna:

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

payments atvsienna:

• wallet: Paypal
• other
• credit card: Mastercard

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