CFMoto is a worldwide powersports brand which also produces ATVs, such as the CFMoto CForce 400. Unfortunately, this model suffers from several issues that affect the driving experience.

In this blog, we’ve outlined all the most important things you should watch for when you’re in the market for a CFMoto CForce 400. In the rest of the article, we’ll discuss every single problem in detail. Furthermore, we’ll tell you how to identify it and fix. Read on!

cfmoto cforce 400 problems

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1. Vapor Lock Issues

CFMoto CForce 400 is a quad bike known for its excellent performance and robustness. However, some users have reported that their CFMoto CForce 400 stalls frequently due to vapor lock issues.

Vapor lock happens when the fuel in the fuel line gets too hot and turns into vapor, which stops the fuel flow and makes the engine stall. This can happen in hot weather conditions or when the engine gets overheated.

A possible solution to solve the vapor lock problem is to add a heat shield or insulation to the fuel line to prevent it from getting too hot. This can be done by wrapping the fuel line with heat-resistant tape or by installing a fuel line sleeve. Another solution is to move the fuel line to a cooler section in the engine compartment or to direct it away from heat sources.

Additionally, regular maintenance such as cleaning the fuel filter and replacing the spark plugs can also help prevent vapor lock issues. In some cases, upgrading to a higher octane fuel can help alleviate vapor lock problems. The best fuel for your CForce is 87 Octane or higher unleaded gasoline.

When you can get it solved yourself, find a dealer to get it fixed.

Also read: Is CFMOTO a Good Brand? Everything You Need To Know!

2. Overheating

The second common problem with the CForce 400 is overheating, especially during hot weather or when working the machine hard.

A low coolant level can be the problem. One way to fix this problem is to check and fill up the coolant level if it is low. First, check the coolant level to see if there is enough coolant in the system. If the level is too low, top it up and check whether the level remains the same. If not, you have a leak. The water pump, radiator or head gasket may need to be replaced with new parts and the coolant should be topped up to the correct level.

A dirty radiator can also be the problem. If you drive your ATV on rough terrain, it can clog up the radiator. This blocks the airflow and makes the cooling capacity smaller. The engine can overheat and eventually shut down when this happens.

Use a pressure washer or hose to clean the radiator. You can also check the radiator fins to see if they are damaged or bent.

Lastly, If it is not the coolant level or a blocked radiator, it could be the thermostat that is not functioning properly, it may need to be replaced if nothing else solves the problem.

One CForce 400 owner described their experience with overheating and how they fixed it:

“My CForce 400 was overheating while plowing snow. I checked the coolant level, and it was low, so I refilled it and cleaned the radiator. Now it runs much cooler.”

3. Electrical Problems

Your ATV can experience various electrical problems, causing issues with the engine, lighting, and other electrical components. Electrical issues can be caused by many things, like loose connections, faulty wiring, or a dead battery. These problems can happen in many ways, such as having trouble starting the engine, the lights not working, or the battery not charging properly.

Perform a thorough inspection of the electrical system if you have an electrical problem. You can do this as follows:

  • Start by checking all connections and wires for damage, making sure that they are properly secured, and replacing any damaged components as necessary. Loose connections can cause a range of problems, so it is important to ensure that all electrical connections are tight and secure.
  • If the battery is dead or not charging properly, it may need to be replaced. It is important to choose a battery that is the correct size and voltage for the CFMoto CForce 400. A battery with too low or too high voltage can cause damage to the electrical system or fail to provide adequate power.
  • If the electrical problems persist, it is recommended to consult a certified CFMoto technician who has experience in diagnosing and repairing electrical issues with the CForce 400. They may use specialized equipment to diagnose the problem and make the necessary repairs.

It is important to follow the manufacturers’ maintenance schedule, which includes checking the electrical system, checking the battery and charging system, and replacing any worn or damaged parts.

Also read: All CFMoto CForce Top Speeds & how to boost the engine!

4. Bad Throttle Response

Another issue with the CForce 400 is poor throttle response, which can be frustrating and possibly dangerous. It is usually characterized by a delay in the ATV’s response to the throttle or an unresponsive throttle. Various factors can cause this, such as a dirty air filter or clogged fuel injectors.

Like always, one way to fix poor throttle response is to perform regular maintenance, check the air filter and fuel system. This includes cleaning or replacing the air filter and cleaning the fuel injectors.

Poor throttle response can also be caused by a malfunctioning of the air/fuel mixture sensor, which causes incorrect fuel and air mixture.

It is also important to ensure that the fuel system is free from dirt or debris, as this can cause blockages and affect performance. Cleaning the complete fuel system, including fuel tank and fuel lines, is then an option.

Another potential cause of poor throttle response is a malfunctioning throttle position sensor. A signal is sent to the engine control unit that measures the position of the throttle and adjusts the fuel and air mixture accordingly. A malfunctioning sensor can cause incorrect fuel and air mixture, leading to poor throttle response. This may require the replacement of the throttle position sensor.

5. Brake Issues

The brake system can experience a range of problems, such as brake pads wearing down, brake fluid leaks, or brake calipers sticking.

Regular maintenance is necessary to prevent brake problems. Regular maintenance is always important when you have an ATV! Regarding the brakes, this includes checking the brake pads and replacing them if they are worn down. Worn brake pads can make the brakes less effective and damage the brake rotor.

The brake fluid level should be checked regularly to ensure that there are no leaks in the brake lines or calipers. The effectiveness of the brakes can be reduced by a loss of brake pressure caused by brake fluid leaks.

See video below how to stop bleeding the brake fluid.

Another cause of brake problems is a stuck brake caliper. This can wear the brake pads unevenly and damage the brake rotor. Sticking calipers can be caused by dirt or debris in the caliper or a problem with the caliper pistons. Cleaning or replacing the caliper or piston may be necessary in this case.

Also read: 9 × CFMoto Starting Problems and how to Fix it!

6. Fuel System Problems

Some owners have reported issues with their machine’s fuel system, including clogged fuel filters and leaks. This can be caused by a variety of factors, such as contaminated fuel, a dirty fuel filter, or a damaged fuel line.

One potential fix for fuel system issues is to replace the fuel filter and inspect the fuel line for any damage or leaks.

Another fix is to clean the fuel tank and use clean fuel to avoid any contamination in the system.

One owner described their experience with fuel system problems and how they fixed it:

“My CForce 400 was running rough and would stall out. I replaced the fuel filter and cleaned the tank, and now it runs much smoother.”

7. Suspension Problems

The suspension on the ATV is rough. This makes driving over hills and bumpy roads a challenge. Adjusting the suspension is almost impossible, and many owners lower the tire pressure instead by about 5 psi to solve this problem.

This isn’t an ideal solution, of course, but it works. Keep in mind the ground clearance because it lowers your ATV by about half an inch.

Another way to address suspension issues is to upgrade the suspension system. Upgraded shocks and suspension components can provide better handling and a smoother ride. CFMoto offers a range of aftermarket suspension components for their vehicles, which can be purchased through authorized dealers or online retailers such as PowersportsID, they offer a range of suspension parts for CFMoto ATVs

Sometimes a lift kit can do the thing. There are several aftermarkets lift kit for sale, for example, the lift kit from Perfex is a suitable solution.