BOYESEN 4740-B150058-ATV Valve 350L Atv

( Brand: Boyesen ), ( Manufacturer Part Number: 4740-B150058-ATV ), ( Part Type: Valve )

Review BOYESEN Rad Valve Polaris Atv fits TRAIL BOSS 2X4 1990–1993

The Boyesen 4740-B150058 ATV Rad Valve is a precision-engineered component specifically designed to ensure optimal performance and reliability for the 1990 through 1993 Polaris Trail Boss 350L ATV. This high-quality radial valve is crafted to meet the demanding requirements of off-road applications, where durability and consistent air pressure are critical for maintaining traction, handling, and overall ride quality. Constructed from robust, corrosion-resistant materials, the valve is built to withstand the harshest conditions, including exposure to dust, moisture, and extreme temperatures, which are common in rugged terrain. Its seamless design minimizes air leakage, ensuring that the tires remain properly inflated even during prolonged use, which is essential for preserving tire life and maximizing fuel efficiency. The valve features a secure, tamper-proof seal that prevents accidental deflation, making it ideal for riders who frequently navigate uneven or rocky paths where tire punctures or valve damage could otherwise lead to unexpected downtime. Whether tackling steep climbs, deep mud, or rough trails, the Boyesen 4740-B150058 provides the stability and performance consistency that enthusiasts demand from their ATVs. Its compatibility with the Trail Boss 350L model ensures a perfect fit, allowing for easy installation without the need for modifications, while its reputation for longevity makes it a trusted choice among off-roaders who prioritize both performance and peace of mind.

### Pros and Cons of buying a Boyesen 4740-B150058 ATV Rad Valve for a 1990-1993 Polaris Trail Boss 350L

1. **Compatibility** The Boyesen 4740-B150058 is specifically designed for Polaris Trail Boss models, including the 350L series from 1990 to 1993. This ensures a proper fit without modifications, reducing the risk of leaks or improper function.

2. **Reliability** Boyesen is a well-known brand in the ATV and off-road industry, known for producing high-quality suspension components. Their valves are designed to improve suspension performance and durability, which can extend the life of your ATV s shocks.

3. **Performance Enhancement** A properly functioning radial valve helps regulate oil flow within the shocks, improving rebound control, damping, and overall ride quality. This can make your ATV handle better on rough terrain, reducing bounce and improving stability.

4. **Ease of Installation** Replacing a radial valve is a straightforward DIY job that typically requires only basic tools. Since the valve is a direct replacement, you won t need to modify the existing setup.

5. **Cost-Effective Upgrade** Compared to full shock replacements, a radial valve is a relatively inexpensive part. If your shocks are otherwise in good condition, replacing just the valve can restore performance without a full overhaul.

6. **Prevents Premature Wear** A failing radial valve can cause internal damage to the shocks over time. Replacing it proactively can prevent more expensive repairs down the road.

7. **Widely Available** Boyesen parts are stocked by many ATV dealers and online retailers, making it easy to source the correct replacement.

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1. **Potential Counterfeit Issues** Like many aftermarket parts, there is a risk of purchasing a counterfeit or low-quality Boyesen valve. Always buy from reputable sellers (e.g., official dealers, trusted online marketplaces) to avoid this.

2. **Limited Longevity Without Full Shock Service** While the valve itself may last a long time, if the shocks have accumulated internal wear (e.g., rust, degraded seals, or contaminated oil), replacing just the valve may not fully restore performance. In such cases, a full shock service or replacement may be needed sooner.

3. **Skill Dependency** If you re not comfortable with basic mechanical work, replacing the valve could be challenging. Improper installation (e.g., not seating the valve correctly or over-tightening) could lead to leaks or reduced performance.

4. **Price Sensitivity** While the valve is affordable, some buyers may find it a minor expense compared to other ATV maintenance needs. If your budget is tight, you might prioritize other repairs first.

5. **Mixed Reviews on Durability** Some users report that Boyesen valves, while functional, may not last as long as OEM valves or higher-end aftermarket alternatives (e.g., Fox or Bilstein). However, this varies by individual usage and terrain.

6. **No Warranty on Used/Aftermarket Parts** Unlike OEM parts, aftermarket valves often come without a manufacturer warranty, leaving you responsible for any defects post-purchase.

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The Boyesen 4740-B150058 radial valve is a **solid, cost-effective choice** for restoring or improving suspension performance on your 1990-1993 Polaris Trail Boss 350L. It offers a direct replacement solution with minimal hassle, and Boyesen s reputation for quality makes it a trustworthy option. However, its effectiveness depends on the overall condition of your shocks if the shocks are old or damaged, the valve alone may not provide long-term benefits.

If your primary goal is to **fix a leaking or malfunctioning valve** and your shocks are otherwise in decent shape, this is a **highly recommended upgrade**. If you re dealing with **worn-out shocks**, consider pairing this replacement with a full shock service or oil change for the best results.

- **Buy from a trusted seller** (e.g., official Boyesen dealers, reputable online retailers like Amazon, RockAuto, or local ATV shops) to avoid counterfeit parts.

- **Inspect your shocks** before purchasing. If they show signs of rust, leaks, or excessive wear, address those issues simultaneously for optimal performance.

- **Follow installation instructions carefully** to ensure a proper seal and avoid leaks.

- **Consider a full shock service** if your ATV sees heavy use or off-road abuse, as this will extend the life of the new valve and shocks.

**Final Verdict:** The Boyesen 4740-B150058 is a **worthwhile purchase** for your Trail Boss 350L, provided you re addressing a specific valve issue and not ignoring broader shock maintenance needs. It s a practical upgrade for riders who want to maintain or improve their ATV s handling without a major investment.

Details:

I need to exchange an item. Parts without fitment are to be assumed universal and may require vehicle modification. This is helpful if you are buying multiple items. Compatibility: Years: Make: model: Application: Notes: 1990 - 1993 Polaris Trail Boss 350L 2X4, 1993 1996 Polaris Sportsman 400 4x4.

Brand: Boyesen, model Number: 4740-B150058-ATV. Boyesen Rad Valve for 1990 - 1993 Polaris Trail Boss 350L 2X4 ATV: An 'RI-form reed valve that corrects the problems associated with existing designs, Maintains flow velocity through and re-directs intake charge even distribution to ports, Provides quicker, sharper throttle response more horsepower, 1-piece aluminum casting; no manifolds trim or plastic pieces insert, Pro Series RAD Reeds included.

part #: 4740b150058 prices

• $179.95-$189.59

specifications carbthrotatv:

• for models: 2x4, Trail, Boss
• for makes: Polaris
• for years: 1990-1993
• brand: Boyesen
• mpn: 4740-b150058-atv
• part type: Valve

seller carbthrotatv:

• rating: 99.9%
• city: Sparks, NV
• # reviews: 85795

payments carbthrotatv:

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

offer carbthrotatv:

• options: Ship-to-home
• quantity: 5
• availability: In Stock
• started: May 23, 2026
• sold: 0

returns carbthrotatv:

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

general carbthrotatv:

• ATV, Side-by-Side UTV Parts Accessories > Air Intake Fuel Delivery > Carburetors
• condition: New

shipping carbthrotatv:

• cost: $0.00
• type: Fixed
• class: Standard
• service: Standard
• transit: 4-7 Days

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