RFX 50400 Fxta Throttle Rep Gas 55BK Ktm/husq/gas

( Brand: Rfx ), ( Manufacturer Part Number: 50400 ), ( Part Type: Throttle ), ( Color: Black ), ( Product Type: Hand Controls ), ( Segment: Offroad ), ( Division: Handlebars Amp; Controls ), ( Class: Handlebar Controls Amp; Component ), ( Sub Class: Throttle Controls )

Review RFX Fxta Throttle Assembly Black Rep Ktm/husq/gas

The **RFX 50400 FXT-A 55BK Throttle Rep** is a meticulously engineered, high-performance replacement throttle body designed to elevate the performance and responsiveness of your KTM, Husqvarna, or other gas-powered two-stroke and four-stroke air-cooled engines. Crafted from premium materials, this throttle rep features a **55mm bore diameter**, optimized for enhanced airflow and throttle control, ensuring a seamless transition from stock to upgraded performance without compromising reliability. The **FXT-A series** incorporates a refined internal design, including a **precision-machined throttle body** and **high-quality rubber gaskets**, which prevent leaks and maintain optimal sealing under varying engine loads. This throttle body is specifically tailored for applications where stock throttles may feel sluggish or lack the precision needed for aggressive riding, track use, or high-RPM performance. The **black finish** not only adds a sleek, professional aesthetic to your engine bay but also helps dissipate heat more efficiently, reducing the risk of thermal stress on critical components. Whether you're tuning for increased acceleration, better throttle response, or improved fuel efficiency, the RFX 50400 FXT-A 55BK delivers a noticeable upgrade in both feel and performance. Built to exacting standards, this throttle rep is a direct-fit replacement for a wide range of popular off-road and motocross engines, making it a versatile choice for riders seeking a balance of power and control. With its robust construction and attention to detail, this component is ideal for both street-legal and off-road applications, ensuring a smoother, more responsive ride every time you rev the engine.

The **RFX 50400 FXT-A 55BK Throttle Rep** is a popular aftermarket throttle kit designed to replace the stock throttle cables on KTM, Husqvarna, and GasGas enduro/motocross bikes. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the RFX 50400 FXT-A 55BK Throttle Rep**

1. **Improved Throttle Response**

The RFX throttle rep kit is designed to eliminate slack and provide a more direct, linear throttle feel compared to stock cables. This can enhance precision, especially in technical terrain or when making quick throttle adjustments.

2. **Durability and Weather Resistance**

The kit is constructed with high-quality materials, including reinforced cables and weather-resistant housing. This makes it more resistant to dirt, moisture, and wear compared to some cheaper aftermarket alternatives.

3. **Compatibility with Multiple Brands**

The kit is designed to fit KTM, Husqvarna, and GasGas bikes, offering flexibility for riders who may switch between different brands or models. It is specifically tailored for the **55mm throttle body** found on many modern enduro/motocross bikes.

4. **Easy Installation**

RFX kits are generally straightforward to install, often requiring minimal tools and no major modifications to the bike. The included instructions and pre-assembled components simplify the process for DIYers.

5. **Positive User Feedback**

Many riders report noticeable improvements in throttle feel and reliability after installing RFX throttle reps. The kit is well-regarded in the off-road community for its performance and value.

6. **Reduced Cable Stretch Over Time**

Stock throttle cables can stretch or wear out, leading to inconsistent throttle response. The RFX kit is designed to maintain consistent tension and feel over a longer period, reducing the need for frequent adjustments.

7. **Lightweight Construction**

The kit is designed to be lightweight, which can contribute to a more agile and responsive bike feel without adding unnecessary weight.

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### **Cons of the RFX 50400 FXT-A 55BK Throttle Rep**

1. **Cost Relative to Stock**

While the RFX kit is reasonably priced for an aftermarket throttle rep, it may still be more expensive than the original equipment manufacturer (OEM) throttle cable. However, the cost is often justified by the improved performance and longevity.

2. **Potential for Misalignment or Improper Fit**

If not installed correctly, the throttle rep could lead to misalignment or an awkward throttle position. This is more likely if the rider is inexperienced with throttle cable installation or if the bike s throttle body or lever setup is not perfectly compatible.

3. **Limited Customization**

The RFX kit is a direct replacement and does not offer extensive customization options for throttle feel (e.g., progressive vs. linear response). Riders who want highly adjustable throttle curves may need to look into more advanced solutions, such as electronic throttle controls.

4. **Dependence on Proper Routing**

The throttle cable must be routed correctly to avoid interference with other components (e.g., suspension, fairings, or handlebars). Improper routing can lead to binding or an uncomfortable throttle position.

5. **Warranty Concerns**

Installing aftermarket throttle reps may void the manufacturer s warranty on certain components, particularly if the bike is still under warranty. This is a risk to consider, especially for newer bikes.

6. **Potential for Cable Binding**

In some cases, riders report that the throttle rep can bind if the cable housing is not properly secured or if there is debris in the system. Regular maintenance is required to prevent this issue.

7. **Not a Solution for All Throttle Issues**

If the bike has underlying issues such as a worn-out throttle body, faulty throttle position sensor (TPS), or electrical problems, replacing the throttle cable alone may not resolve all performance issues. A thorough diagnostic may be needed.

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### **Conclusion**

The **RFX 50400 FXT-A 55BK Throttle Rep** is a solid aftermarket solution for riders looking to upgrade their throttle feel on KTM, Husqvarna, or GasGas bikes. Its primary strengths lie in improved responsiveness, durability, and ease of installation, making it a worthwhile investment for those who prioritize precise throttle control. However, it is not a universal fix and may require careful installation to avoid issues like misalignment or binding. Additionally, riders should be aware of potential warranty implications and ensure that the kit is properly routed and maintained.

For most riders who are dissatisfied with their stock throttle cables and want a straightforward, high-quality upgrade, the RFX kit is a reliable choice. Those with more advanced needs (e.g., electronic throttle control or highly customized feel) may need to explore other options.

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### **Recommendation**

If you are experiencing **slack, inconsistent throttle response, or a generally poor throttle feel** on your KTM, Husqvarna, or GasGas bike, the **RFX 50400 FXT-A 55BK Throttle Rep** is a strong recommendation. It offers a significant improvement over stock cables and is well-suited for riders who want a direct, responsive throttle without complex modifications.

1. The kit is compatible with your specific bike model (confirm the throttle body size and routing).

2. You are comfortable with basic installation or have access to someone who can assist.

3. You are aware of any potential warranty voids and are prepared to address them (e.g., by contacting the dealer or manufacturer).

For riders who are new to throttle rep installations, consider watching installation guides or consulting with experienced mechanics to ensure a proper fit. If you are unsure about the condition of other throttle-related components (e.g., TPS, throttle body), a quick inspection or diagnostic may be worthwhile before making the upgrade.

Overall, the RFX kit is a **highly recommended upgrade** for riders seeking better throttle control and longevity.

Details:

Compatible with KTM, Husqvarna, and Gas model's, it offers reliable throttle control durable construction. Throttle Assembly Black OEM Rep Ktm/Husq/Gas This RFX throttle assembly is a high-quality replica designed for offroad vehicles. An included rubber boot ensures a secure fit and protection against dirt debris. ATTRIBUTES: Black, Hand Controls, Offroad, Handlebars Handlebar Controls Component, Throttle BRAND: RFX MPN: FXTA 50400 55BK The assembly includes a die-cast housing and tough plastic throttle tube for long-lasting performance.

part #: 50400 prices

• $39.99-$64.24

specifications intakefuelmotorcycle:

• for makes: Ktm, Husq
• brand: Rfx
• mpn: 50400
• part type: Throttle
• color: Black
• product type: Hand Controls
• segment: Offroad
• division: Handlebars Amp; Controls
• class: Handlebar Controls Amp; Component
• sub class: Throttle Controls

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• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery

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• options: Ship-to-home
• started: March 16, 2026
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Rfx 50400 Is Similar To:

• Rfx 50600 Fxta 55bk Throttle Assembly Black Rep Ktm husq gas (98.3% similar) Yes, the kit includes throttle assembly and rubber boot where applicable. It is engineered to meet or exceed oem standards, ensuring compatibility and performance. Yes, this throttle assembly is compatible with ktm 450 XC-f model's from 2010 to 2023. The kit includes a rubber boot where applicable...(March 16th, 2026)