6 x CFMOTO CFORCE 400 Problems – Easy to Fix


The CFMOTO CFORCE 400, an entry-level ATV, is designed with off-road enthusiasts in mind, boasting a powerful engine and a reliable suspension system that can tackle diverse terrains.

Its state-of-the-art design merges seamlessly with impressive modern features, making it an appealing choice among budget-friendly options in the ATV market.

However, like any mechanical marvel, the CFORCE 400 isn’t immune to certain problems that riders might encounter during their journey.

One of the issues that some riders have reported is overheating. While the CFORCE 400 is built for robust performance, extended usage in demanding conditions can lead to excessive heat buildup.

This, in turn, might result in starting issues and poor throttle response.

These symptoms could point towards vapor lock problems, where the fuel fails to reach the engine consistently due to the formation of vapor bubbles in the fuel line.

Addressing this requires a careful inspection of the fuel system and ensuring proper ventilation.

Moreover, the exhaust system of the CFORCE 400 has also posed concerns for some riders.

Over time, certain models have exhibited brake issues, affecting the overall riding experience.

The brakes’ performance can be compromised due to excessive heat generated during prolonged use, necessitating periodic checks and potential upgrades to the brake system.

If you’re encountering any of these problems with your CFMOTO CFORCE 400, don’t fret; there’s a comprehensive troubleshooting guide available to assist you.

From diagnosing the source of overheating to tackling starting and throttle issues, this guide offers step-by-step instructions to help riders identify and rectify these concerns.

It’s crucial to address any issue promptly, not only to ensure a safe and enjoyable riding experience but also to prolong the lifespan of your CFORCE 400.

CFMOTO CFORCE 400 Problems

CFMOTO CFORCE 400 Problems

Starting Issues

If your CFORCE 400 has been used for a considerable duration, it’s not uncommon to encounter starting issues.

The All-Terrain Vehicle is designed to handle difficult landscapes, exposing its components to the greater possibility of breakdown.

If your ATV’s engine fails to ignite, the problems could be:

  1. Dead battery
  2. Corroded battery terminals
  3. Loose connections
  4. Clogged carburetor
  5. Defective spark plugs

How To Fix The Starting Issue

  1. When dealing with starting problems in your CFORCE 400 ATV, the battery is a crucial component to inspect.
  2. A weak or faulty battery can often be the root cause of starting issues.
  3. To begin your troubleshooting process, use a multimeter to measure the battery’s voltage.
  4. If the voltage is lower than the recommended level, it’s essential to give the battery a proper charge.
  5. Before doing so, ensure the terminals are clean and free from any corrosion or clogs.
  6. If you notice any build-up on the terminals, a mixture of baking soda and water can serve as an effective cleaner.
  7. Additionally, using a terminal cleaner will help maintain a solid connection.
  8. While inspecting the battery, pay attention to the grounding wire as well.
  9. A loose or defective grounding wire might hinder the starting process.
  10. If any issues are detected, securing or replacing the grounding wire can work wonders for restoring proper starting functionality.
  11. Moreover, a thorough examination of the battery itself is necessary.
  12. If it’s found to be defective beyond repair, a replacement is inevitable.
  13. Moving beyond the battery realm, another potential area to address is the carburetor and fuel system.
  14. A clogged carburetor can impede fuel flow to the engine, leading to starting problems.
  15. Ensuring that the carburetor is clean and free from any dirt or debris is crucial.
  16. Use a clean, damp microfiber towel to carefully wipe away any dirt.
  17. Moreover, inspect the fuel lines and filter for any signs of blockage.
  18. If the fuel supply is compromised, the engine might struggle to start.
  19. In such cases, a proper cleaning or even a replacement might be needed.
  20. Focusing on ignition components, the spark plugs play a vital role in the starting process.
  21. If the spark plugs are burnt or damaged, the ignition sequence could be disrupted.
  22. Replacing the spark plugs with high-quality options, such as iridium spark plugs, can make a notable difference in the starting performance.
  23. Vapor Lock Problems

Vapor lock problems arise when the fuel within the ATV’s fuel line heats up and transforms into vapor, leading to an engine shutdown.

This is typically caused by an excessively heated engine or operation in hot climates.

The main reasons for vapor lock problems encompass:

  1. Clogged fuel filter
  2. Malfunctioning fuel pump
  3. Improper positioning of fuel line

How to fix the vapor lock problems?

  1. To address vapor lock problems on your CFORCE 400, carry out an inspection on the fuel filter and entire fuel lines for any blockages.
  2. Clear out the fuel line and switch out the obstructed fuel filter for a new one.
  3. If you discover a defective fuel pump, consider substituting it with an electric variant.
  4. Then, envelope the fuel line using a heat shield to ward off extreme temperatures, preventing the fuel from getting overheated.
  5. Alternatively, you could reroute the fuel line away from the engine area.
  6. Furthermore, implementing a proficient fuel stabilizer into the tank can help in reducing the fuel’s volatility.
  7. If feasible, opt for fuel with a higher octane rating to decrease the likelihood of encountering vapor lock issues.

Poor Throttle Response

Unsatisfactory throttle reaction is a prevalent issue in the CFMOTO CFORCE 400 and is also frequently seen in other CFORCE models like the 500 ATV.

This problem manifests when the engine doesn’t react promptly at full throttle.

This malfunction renders the highest gear ineffective, compelling operators to utilize the lower gear.

The root causes of a poor throttle response can be traced back to obstructed fuel injectors, a dirty air filter, or a malfunctioning throttle position sensor.

How to Fix Poor Throttle Response?

A dirty air filter can restrict airflow to the engine, resulting in poor performance. Inspect the air filter and clean it if needed to restore proper airflow.

Clogged fuel injectors can also cause sluggish engine response. Clean the injectors to remove any deposits obstructing fuel flow. Also, clean out the entire fuel system to eliminate debris.

If cleaning the air filter and fuel system does not fix ongoing throttle issues, the problem may be a faulty throttle position sensor. Use a multimeter to test the throttle position sensor to see if it is malfunctioning.

If tests show the sensor is defective, replace it to resolve the throttle problems.

Checking and cleaning the air filter as well as the fuel injectors and system is the first step in troubleshooting poor ATV performance.

If those actions don’t fix a throttle issue, focus on testing and potentially replacing the throttle position sensor.

This structured troubleshooting approach can identify and resolve the underlying cause of sluggish ATV response.


The CFORCE 400 has the potential to get excessively hot over time, particularly if maintenance is not consistently performed by the owner. The ATV is likely to overheat after prolonged heavy use or usage in a hot climate.

Here are the possible reasons your ATV could be overheating:

  1. Low coolant level
  2. Dirty radiator
  3. Air in the coolant system
  4. Blown head gasket

How to fix Overheating Problem?

Begin by examining the coolant level, it could be insufficient. If this is the case, you should replenish the reservoir.

Also, carry out a check for any signs of leakage in the reservoir and mend any leaking sections identified.

Moreover, a blown head gasket might be the cause of coolant leakage, replace it if found damaged.

Another element to look into is the radiator. If the radiator is obstructed, it hinders airflow, rendering the coolant ineffective.

Clean such radiator by flushing it with a hose and eliminate any residue using a cleaning agent.

If the radiator fins seem damaged, replace them.

If the overheating continues, your coolant system may contain an air pocket that is disruptive to coolant circulation.

This can be remedied by releasing the trapped air from the system.

Brakes Issues

With consistent use on tough terrains, the CFORCE 400 may experience brake complications over time. Some frequent brake issues on this ATV are:

  1. Brake pads wearing down
  2. Leakage of brake fluid
  3. Sticky brake calipers

A majority of CFMOTO CFORCE 400 problems, such as these brake difficulties, can be prevented by regular check-ups and maintenance.

How to fix brake issues?

If you observe issues with your ATV’s brakes, inspect for worn-out brake pads and substitute them if required.

Brake pads tend to degrade rapidly due to heavy use of your ATV on tough terrains.

Therefore, if their replacement hasn’t been done for a while, they might be worn down.

Issues with the brake system might also stem from diminished levels of brake fluid.

Check the brake line and calipers for any leakages. Ensure to fix or replace any parts leaking to make your brakes work effectively.

In case the brake problem still prevails, look for a jammed brake caliper.

A stuck brake caliper can harm the rotor and cause abnormal wearing of the brake pads.

If the calipers are dirty or have debris on them, clean them off. Alternatively, replace them if they appear to be damaged.

Excessive Heat From the Exhaust

During prolonged rides, the CFORCE 400’s exhaust pipe tends to heat up excessively, leading to rider discomfort.

This elevated heat affects the fuel tank and the external plastic covering, causing riders to struggle to keep their right leg positioned without experiencing a burn.

How to fix Excessive Heat From the Exhaust Problem

If the excess heat from the exhaust pipe makes riding uncomfortable, consider installing a heat shield. This will help in mitigating the heat that affects the plastic casing and fuel tank.

Moreover, consider taking your ATV to a dealer or a skilled mechanic to get the exhaust pipe replaced.

Opt for an aftermarket alternative that ensures heat is deflected away from your leg.

As another option, investing in heat-resistant riding trousers could provide additional protection against excessive heat.


Although the CFORCE 400 is a dependable all-terrain vehicle, it is susceptible to a range of performance-affecting problems. Fortunately, the majority of challenges associated with the CFMOTO CFORCE 400 are straightforward to identify and rectify.

Utilize the aforementioned solutions to address these concerns or seek assistance from a nearby mechanic. Additionally, maintaining regular upkeep of your ATV is crucial for ensuring seamless and hassle-free riding adventures.