BOYESEN MN-RJ61 Valve Boot Fuel Air Reeds Mu MN/RJ61 TC85

( Brand: Boyesen ), ( Manufacturer Part Number: MN/RJ61 ), ( Compatible Year: 2020 2019 2018 ), ( Compatible Model: Tc85 17/14 ), ( Bundle Description: 1 Pc Genuine Boyesen Rad Valve Boot ), ( Type: Rad Valve Boot ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review BOYESEN Mn/rj61 Rad Valve Boot Husqvarna Fuel And Air Reeds Mu fits 2014–2020

The **Boyesen MN/RJ61 Rad Valve Boot** is a meticulously engineered replacement part designed specifically for the **2018 2020 Husqvarna TC85, TC17, and TC14** models, ensuring a precise fit for the fuel, air, and reed intake systems. Crafted from high-quality, durable materials, this valve boot is built to withstand the demanding conditions of off-road and utility applications while maintaining optimal performance. The boot features a **reinforced, flexible rubber compound** that resists cracking, oil, and fuel degradation, extending the lifespan of your engine s intake components. Its **tight-sealing design** prevents air leaks, ensuring consistent fuel delivery and efficient combustion, which is critical for maintaining power and throttle response in your Husqvarna s two-stroke engine. The **universal compatibility** of the RJ61 model makes it an ideal upgrade for riders who demand reliability without sacrificing ease of installation simply snap it into place over the existing valve assembly, eliminating the need for complex modifications. Whether you're tackling rough terrain or performing routine maintenance, this valve boot helps preserve the integrity of your engine s intake system, reducing the risk of carbon buildup, valve sticking, or premature wear. Built to meet Boyesen s rigorous standards, it s a straightforward yet essential component for anyone looking to keep their Husqvarna running at peak performance for years to come.

Buying a Boyesen MN/RJ61 Rad Valve Boot for a 2018-2020 Husqvarna TC85 (17", 14" fuel air reeds, MU engine) can be a useful upgrade, but it comes with trade-offs depending on your priorities. Below is a detailed breakdown of the pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Boyesen Rad Valve Boot**

1. **Improved Airflow and Performance**

The Boyesen Rad Valve Boot is designed to enhance airflow into the carburetor by replacing the stock rubber boot with a more rigid, metal-reinforced version. This can reduce flexing and improve the consistency of air intake, potentially leading to better throttle response, smoother power delivery, and slightly improved top-end performance. For a high-revving engine like the Husqvarna TC85, even minor airflow improvements can translate to better acceleration and stability under load.

2. **Durability and Longevity**

The stock rubber boots on many Husqvarna models (especially on the MU engine) can degrade over time, cracking or hardening, which restricts airflow and reduces performance. The Boyesen boot is made from more durable materials, including reinforced rubber and metal components, which are less prone to wear and tear. This makes it a long-term solution rather than a temporary fix.

3. **Easier Installation and Compatibility**

Boyesen parts are known for their straightforward installation process. The Rad Valve Boot is designed to fit directly onto the stock carburetor without requiring extensive modifications. It also comes with clear instructions, making it accessible for DIYers who may not have extensive mechanical experience. The part is specifically engineered for the Husqvarna TC85 s carburetor setup, ensuring a proper fit.

4. **Cost-Effective Upgrade**

Compared to more extensive modifications like full carburetor rebuilds or engine swaps, the Boyesen Rad Valve Boot is relatively inexpensive. It offers a low-risk way to improve airflow and address potential issues with the stock boot without requiring significant investment. For riders who want incremental performance gains without major overhauls, this is an attractive option.

5. **Potential for Reduced Carburetor Fouling**

Improved airflow can help prevent carburetor fouling caused by inconsistent air intake. When the stock boot flexes or leaks, it can draw in unfiltered air or debris, leading to clogged jets or poor atomization of fuel. The Boyesen boot s tighter seal and consistent airflow can mitigate these issues, reducing the frequency of carburetor cleaning or adjustments.

6. **Backed by Positive User Feedback**

Many riders and tuners report noticeable improvements in throttle response and power after installing the Boyesen Rad Valve Boot. Online forums and reviews often highlight its effectiveness, particularly for engines that are already well-tuned but still exhibit minor airflow restrictions. This social proof can be reassuring for buyers considering the upgrade.

7. **Minimal Tuning Required**

Unlike more aggressive modifications (e.g., big-bore kits or aggressive carburetor upgrades), the Rad Valve Boot typically doesn t require significant tuning adjustments. While you may need to revisit the carburetor settings slightly (e.g., checking idle mixture or jet sizing), the changes are usually minor and straightforward. This makes it a "plug-and-play" solution for those who want performance gains without deep tuning.

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### **Cons of the Boyesen Rad Valve Boot**

1. **Limited Performance Gains**

While the Rad Valve Boot can improve airflow, the gains are modest compared to more substantial modifications. For a stock or lightly modified TC85, the difference may be subtle better throttle response but not a dramatic power increase. If you re looking for significant horsepower or top-speed improvements, this upgrade alone won t deliver those results. It s best suited for riders who want incremental refinements rather than a complete overhaul.

2. **Not a Cure for Other Issues**

The Rad Valve Boot addresses only the airflow restriction caused by the stock boot. If your TC85 has other problems such as worn pistons, a leaking head gasket, or incorrect carburetor settings the boot won t compensate for those. It s a symptom-specific fix, not a comprehensive solution. Always diagnose the root cause of performance issues before investing in this part.

3. **Potential for Over-Tuning**

If the carburetor is already tuned aggressively (e.g., with aftermarket jets or a big-bore kit), installing the Rad Valve Boot could lead to an overly rich mixture or rough idle if not properly adjusted. This is especially true if the stock jets are still in place. Riders must be prepared to revisit their carburetor setup to avoid running lean or fouling the spark plug.

4. **Installation Requires Some Mechanical Skill**

While the Boyesen Rad Valve Boot is easier to install than some modifications, it still requires removing the carburetor from the bike and handling small parts. For beginners, this could be a challenge, especially if the carburetor is stubborn or if the rider lacks basic tools (e.g., a carburetor cleaning kit or a soft-bristle brush). Improper installation could lead to leaks or improper sealing.

5. **Compatibility with Aftermarket Carburetor Upgrades**

If you plan to upgrade to an aftermarket carburetor (e.g., a Walbro or Keihin), the Boyesen Rad Valve Boot may not be compatible or could interfere with the new setup. Some aftermarket carbs have different boot designs or require specific seals. Always verify compatibility before purchasing, especially if you re considering future modifications.

6. **Minimal Impact on Low-End Power**

The Rad Valve Boot primarily benefits high-RPM performance by improving airflow at higher throttle positions. Low-end torque and acceleration may not see significant improvements, which could be a drawback for riders who prioritize quick off-the-line response. If low-end power is a concern, other modifications (e.g., a different jet size or a torquey engine setup) would be more effective.

7. **Cost vs. Benefit for Stock Riders**

For riders who keep their TC85 stock or with minimal modifications, the performance gains from the Rad Valve Boot may not justify the cost. The improvement might be negligible unless the stock boot is already degraded or causing noticeable airflow restrictions. In such cases, the money could be better spent on other upgrades (e.g., a better air filter, exhaust, or suspension tuning).

8. **Potential for Voiding Warranty (If Applicable)**

If your TC85 is still under warranty, installing aftermarket parts like the Boyesen Rad Valve Boot could void the warranty, depending on the manufacturer s policies. Husqvarna s warranty terms typically require original equipment to remain unmodified. Always check the warranty details before proceeding with modifications.

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### **Conclusion**

The Boyesen MN/RJ61 Rad Valve Boot is a practical and relatively low-risk upgrade for the 2018-2020 Husqvarna TC85, particularly for riders who want to address airflow restrictions caused by the stock boot. It offers modest but noticeable improvements in throttle response, consistency, and durability, making it a worthwhile investment for those who prioritize incremental performance gains without major overhauls. The ease of installation and cost-effectiveness further add to its appeal.

However, it is not a magic solution for all performance issues. The gains are limited to airflow improvements, and it won t compensate for other engine or carburetor problems. Riders should be prepared to adjust their carburetor settings and ensure compatibility with any existing modifications. For those who are content with their bike s current setup and want a simple, effective tweak, the Boyesen Rad Valve Boot is a solid choice. For those seeking significant power increases or addressing broader performance issues, more comprehensive modifications would be necessary.

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### **Recommendation**

- You notice inconsistent throttle response or rough idle due to a degraded stock boot.

- You want a simple, cost-effective way to improve airflow without major modifications.

- Your TC85 is otherwise well-tuned, and you re looking for incremental performance gains.

- You re comfortable handling basic carburetor maintenance and adjustments.

- You re looking for dramatic power increases or top-speed improvements.

- Your TC85 has other underlying issues (e.g., engine wear, carburetor fouling) that need addressing first.

- You plan to install an aftermarket carburetor in the near future, as compatibility may be an issue.

- You re on a tight budget and could allocate funds to more impactful upgrades (e.g., exhaust, suspension, or engine tuning).

For the average rider who wants a straightforward, effective upgrade to their Husqvarna TC85, the Boyesen Rad Valve Boot is a recommended purchase. It s a small but meaningful step toward optimizing airflow and maintaining the engine s health. Pair it with regular carburetor cleaning and proper tuning for the best results. If you re unsure about installation or tuning, consult a professional to ensure the upgrade is done correctly.

Details:

Boyesen Rad Valve Boot for 2018 - 2020 Husqvarna TC85 17 14 - Fuel Air Reeds mu: Status: In Stock.

part #: mnrj61 prices

• $45.32-$176.58

specifications intakefuelmotorcycle:

• for makes: Husqvarna
• for years: 2014-2020
• brand: Boyesen
• mpn: Mn/rj61
• compatible year: 2020 2019 2018
• compatible model: Tc85 17/14
• bundle description: 1 Pc Genuine Boyesen Rad Valve Boot
• type: Rad Valve Boot
• core charge: Free No Core Charge
• fitment type: Direct Replacement

shipping intakefuelmotorcycle:

• service: Standard
• cost: $0.00
• transit: 3-5 Days
• class: Standard
• type: Fixed

returns intakefuelmotorcycle:

• policy: Returns Accepted
• time: 30 Days
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general intakefuelmotorcycle:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery
• condition: New

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• started: May 10, 2026
• options: Ship-to-home
• availability: In Stock
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• quantity: 1

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• city: Multiple warehouses
• # reviews: 22503
• rating: 99.2%

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