FuelX Review (KTM 390 Adventure)

Summary

In this review of the KTM 390 Adventure's Fuel X Light, the rider shares their experience after installing the tuning module alongside a Dominator full exhaust system. While the Fuel X Light didn’t drastically improve torque or power, it notably smoothed out the throttle response, a key improvement for those bothered by jerky acceleration. Although claims of lowering engine temperatures were unsubstantiated, the module offered a solid performance boost in terms of rideability. At $150, it’s recommended for smoother throttle, especially for bikes with upgraded exhaust systems, though it’s not essential for stock setups.

Takeaways

• 😀 The reviewer has had the 2020 KTM 390 Adventure for about 25,000 miles and recently installed the FuelX Light.
• 😀 The FuelX Light was initially purchased to complement a Dominator exhaust system, which replaced the bike's factory exhaust components.
• 😀 One concern when installing a full exhaust system is losing back pressure, which could impact the bike's performance and fuel mixture.
• 😀 The FuelX Light claims to add bottom-end torque, smooth out throttle response, and help lower engine temperature, but its actual effects are subtle.
• 😀 After installing the FuelX Light, the reviewer didn't notice a significant increase in torque, especially when compared to their previous sprocket modification.
• 😀 The reviewer recommends dropping a tooth in the front sprocket for better low-end torque at a much lower cost ($13), instead of relying on the FuelX Light.
• 😀 The FuelX Light does significantly improve throttle smoothness, eliminating herky-jerky throttle response under 4,000 RPMs, which is common in this engine type.
• 😀 Despite FuelX claims, the bike did not noticeably run cooler after installation, and there was no overheating issue even without the modification.
• 😀 The reviewer found no significant increase in power or torque after installing the FuelX, but the smoother throttle was a clear benefit.
• 😀 The FuelX Light is a good option if you’re annoyed by the stock throttle response, and it's worth considering if you’re adding a full exhaust system. It's not essential for stock exhausts.
• 😀 If you're installing a full exhaust system, the reviewer recommends the FuelX Light for improving throttle response and making the bike run less lean, but it’s not necessary for all riders.

Q & A

What is the purpose of the Fuel X Light on the KTM 390 Adventure?

The Fuel X Light is designed to improve low-end torque, smooth out throttle response, and potentially reduce engine temperatures, particularly after installing a full exhaust system.

Did the Fuel X Light noticeably improve low-end torque on the bike?

No, the Fuel X Light did not noticeably increase low-end torque, especially after the rider had already added a larger rear sprocket. A smaller sprocket in the front was recommended for better torque results.

How did the Fuel X Light affect throttle smoothness on the KTM 390 Adventure?

The Fuel X Light significantly improved throttle smoothness, making the bike feel much better during acceleration from low speeds, particularly smoothing out the jerky throttle response at low RPMs (below 3,500-4,000 RPM).

Does the Fuel X Light help in lowering engine temperatures?

While the Fuel X Light claims to lower engine temperatures by making the bike run less lean, the improvement is minimal and not easily noticeable. The bike already performs well in terms of temperature control, even in off-road situations.

Was there a noticeable performance gain after installing the Fuel X Light?

No significant performance gain was observed with the Fuel X Light. The rider reported that there was no increase in power or acceleration after installation, and any changes were very subtle.

Is the Fuel X Light necessary if you are installing a full exhaust system on the KTM 390 Adventure?

The Fuel X Light is not absolutely necessary, but it is recommended if you are installing a full exhaust system. It helps compensate for any slight lean conditions caused by the increased airflow, especially if your exhaust system manufacturer does not include a fuel tuner.

What is the main benefit of the Fuel X Light for KTM 390 Adventure owners?

The main benefit is the improved throttle smoothness, which makes the bike feel better and more responsive, especially at low speeds or during off-road riding.

Does the Fuel X Light significantly affect back pressure in the exhaust system?

The Fuel X Light does not significantly affect back pressure. While the catalytic converters and resonator in the stock exhaust may provide some back pressure, removing them (with a full exhaust system) does not seem to cause a noticeable loss in power.

What is the price range for the Fuel X Light and is it worth it?

The Fuel X Light typically costs around $150, which is considered a reasonable price for the improvement it offers in throttle smoothness and slightly compensating for lean conditions. It’s a good value if smoother throttle response is a priority.

Should KTM 390 Adventure owners purchase the Fuel X Light if their exhaust system is stock?

No, if the exhaust system is stock, the Fuel X Light is not necessary. The rider recommends it mainly for those who have installed a full exhaust system or are looking to smooth out throttle response.