5 Common Kawasaki KFX 50 Problems (Easy Fixes Added)

The Kawasaki Kfx 50 is an ideal four-wheeler vehicle for tweens and teens. It was designed for those just learning how to drive motor vehicles. However, as is the case with all motor vehicles, it sometimes has issues. That’s not a big deal since all of these can be fixed. 

Some problems riders have faced are issues with the engine throttle, the engine overheating after prolonged riding, battery issues, issues with the auto choke, and lowered speed after some riding. 

It’s time to discuss each problem in more detail and explore possible solutions. So, enjoy the reading!

Kawasaki KFX 50 Problems

1. The Engine Throttle Stalling

That occurred to at least a few young people who rode the four-wheeler. Their main issue was that the vehicle suddenly and unexpectedly stalled on them when they were driving it.


Check the header pipe to see if there’s a leak around the exhaust area. Leaks can be caused by insufficient back pressure. 

While at it, it wouldn’t hurt to check if the head gasket is intact. Remember that it will suck in lots of air if it has even the smallest leak or tears. 

That will cause the engine throttle to not move at full capacity.

Of course, if the warranty is still active, you can always take the four-wheeler to the dealership and have them fix the engine throttle issues for you. 

However, if you want to fix the issue yourself, then you need to remove the exhaust restrictor. 

Go one step further and remove the fuel restrictor that’s attached to the intake manifold.

These steps won’t your engine up a lot, but at least they will keep your throttle from stalling when riding it!

2. Engine Overheating

Overheating engines and throttling issues are common complaints from users. The engines can overheat so much that the seats become hot and difficult. 

Also, a very hot engine heats the entire vehicle, affecting its short- and long-term performance and lifespan!


It is an ATV, and all ATVs’ engines should perform optimally in the 120-180 Fahrenheit degree range. These vehicles can have issues if the engine heat increases beyond that range. 

It’s important to fix the issue of overheating engines quickly since the heat can spread to other parts of the bike and damage it.

First, you should examine the fan since improperly working fans can cause the engine to overheat and then malfunction quickly. 

Improperly working fans don’t send enough air to heating engines to cool them down sufficiently and quickly. Hint – you know the fan is working as it should when you hear it running and feel air coming out from underneath your seat.

Fans tend to malfunction when their wiring is off. So, it’s always wise to check your fan frequently for loose connections and fix them as appropriate or necessary. 

You may check if all of your fan’s blades are straight since bent blades can cause the fan to work funnily. 

If the blades are bent, a fix as easy as using a wrench to put the blades back into place may be all that’s needed. Of course, you may need to replace the fan if the blades are badly damaged.

The next thing you should do is check the engine oil and coolant levels. If these are low, that can easily cause the engine to overheat rapidly. Also, never have your teen or tween ride the ATV at insanely low speeds. 

Doing so will make the engine overheat in no time. The same applies to turning the vehicle on while not moving it (idling it!)

Finally, make sure that your spark plugs are always in excellent shape. Worn-out or old spark plugs can overheat since that increases the weight load of the ATV. All ATVs were designed to accommodate up to 250 pounds. 

Any more weight and the engine will start overheating quickly since its workload will increase.

3. Battery Malfunctioning

It can have issues with malfunctioning batteries. The reason is often attributed to bad wiring. The wiring can also become damaged because of prolonged rough usage. 

Riding the ATV in cooler weather can also cause battery cells to not work as well because of dramatically lowered CCA levels.


The first thing you should do is look at the battery’s wiring. It’s always essential to reconnect any loose wires immediately. 

It would be best to use strong electric tape to secure the connections. 

The electric tape will keep the wires in place longer and extend the battery’s life expectancy. 

You should also check that the battery’s CCA levels never exceed 50%. Batteries with lower CCA levels don’t function as efficiently. 

Also, optimally performing batteries contribute to smoother, longer, and more comfortable rides.

4. Choke Problems

The auto choke can give you some issues, and that can affect the ATV’s performance. 

Many riders complain that the ATV doesn’t run nearly as fast as they want when the auto choke doesn’t perform optimally. 

Understandably, they want to solve that without spending a fortune doing so!


The first issue is to take the carburetor and jet starter out. It helps if you just slide them out. Don’t follow the lengthy steps and procedures described by the user’s manual. Those are just unnecessary and lengthy. 

Then, empty all excess fuel from the carb since that can cause your engine to stall.

Next, take the jet starter off the carburetor and run the appropriate test procedures to ensure your engine is functioning as it should. 

Next, you’ll need to order a special kit to put the engine back together again. 

5. Doesn’t Rev Up Quickly After Ridden for a While

The engine can have difficulty picking up speed quickly after being ridden for at least a few months. 

Many teens and tweens have issues with that, and their parents are at their wit’s end since they have tried everything suggested in the instruction manuals to no avail. 

So, they are eager for another solution. 


Check to see if the throttle limiter has been turned on. Next, check the Continuously Variable Transmission (CVT) collar to see if it is limited. 

Always ensure you use premium fuel in the ATV since sub-standard fuel can and will affect the engine’s performance and pull down the vehicle’s optimal speed. 

Check the engine to see if it gets enough energy from its fuel. An engine starved of energy will not be able to work at full speed. 

It also won’t be able to help your vehicle accelerate to higher and higher speeds faster. 

Finally, ensure the air filters work properly, and the fuel taps aren’t turned off.

What to Look for When Buying a Kawasaki KFX 50 Model?

Since you’ll buy the vehicle for your tween or teen, ensure you’re in charge. You can do that by looking for a vehicle with an electric start and a backup kick start. 

That will help your kid tremendously should they ever encounter issues while riding it!

Remember that the more parental controls the vehicle has, the better since you’ll always be in control. You want to ensure that the vehicle you buy won’t always be in the shop. 

You want to buy the Kawasaki KFX 50 if you have an adventurous kid at least 6 years old. 

Which Model Has the Most Issues?

The Kawasaki 2007 model of the Kawasaki KFX 50 has the most issues. Kawasaki has recalled these models because of safety issues. 

There are about 9000 ATVs in total that have been recalled. The reasons are that the tie-rod end nuts may not be tightened properly. That can make the handlebars lose. 

The ATV is unsafe to drive and can result in severe injuries and even death if ridden in that condition.

You can lose control of the ATV’s steering wheel when driving, and that’s dangerous.

Warranty and Recalls for Kawasaki KFX 50 and KFX 90

The warranty and recall pertain to a particular Kawasaki KFX 50 because fuel tap leaks can cause potentially devastating and dangerous fires. 

The warranty covers all necessary repairs. 

The warranty lasts 12 months, and riders are eligible for the Kawasaki protection plus program. 

The warranty only covers manufacturing defects and not rider negligence or issues.

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How much weight does the Kawasaki KFX 50 accommodate?

It can easily accommodate up to 187 pounds.

How fast can the Kawasaki KFX 50 Go?

It can go up to 15 miles an hour.

How much can I sell a Kawasaki KFX 50 for?

Up to $1,999.

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