Dirt Bike Sputtering: 6 Causes Explained For Beginners

There are a number of problems that are related to the dirt bike, and sputtering on a bike is a fairly common problem, which you have either already encountered or are suffering from right now.

I’ve also had this problem a number of times, and my research has led me to find several possible reasons why.

If you wish to stop your dirt bike from sputtering, you should first familiarize yourself with the six potential reasons of the problem.

What is Sputtering on A Dirt Bike?

When the engine is almost out of fuel, it will sputter almost invariably at some point. However, if the fuel gauge shows that there is sufficient fuel, then you can be certain that the issue is deeper within the engine body.

If an engine is sputtering, it is trying to tell you that there is a more serious issue that has to be addressed as soon as possible.

Sputtering can be caused by a number of factors, including incomplete combustion within the engine and problems with the ignition system.

It’s possible that the vehicle’s sputtering problem is due to a clogged fuel injector somewhere inside the fuel system.

Sputtering is not considered to be a significant problem; nonetheless, it is a symptom of a larger problem that cannot be remedied by itself, and as a result, it will ultimately result in a significantly more expensive repair or service.

How Does It Affect The System Work?

If an engine is sputtering, then the underlying causes that are leading to its location could be in a variety of places.

In this section, we are going to talk about the two areas that are most likely to be accountable for this problem. These components are the fuel system and the exhaust.

Exhaust gases are collected by the exhaust system after being emitted from the cylinder head and passing via the exhaust manifold.

The exhaust system acts like a funnel to move the exhaust gases away from the cylinders.

After that, the gases make their way through the front pipe and into the catalytic converter.

Now that the catalytic converter has taken over, its job is to get rid of the dangerous components that are mixed in with gases like hydrogen monoxide and carbon monoxide, and then turn those gases into inert gases.

Now the gas is being transferred from the catalytic converter to the muffler, and while this is happening, there is a reduction in the amount of noise.

This is the reason why the exhaust gases come out of the dirt bike’s tailpipe.

The fuel system is responsible for the storage of fuel as well as the delivery of fuel to the bike. That is what makes the engine go.

This takes place within the intake system of the motor.

Gasoline is put into the engine’s cylinder, where it is then lit on fire. This creates the energy that moves the piston.

Why is My Dirt Bike Sputtering?

A bike may sputter due to a number of various factors. The vast majority of the time, this issue is caused by carburetor faults, such as tuning problems, vacuum leaks, fuel leaks, It’s also possible that the ignition coil is broken, the air filter is clogged, the engine timing is incorrect, the spark plugs or spark plug wires are rusty or broken, or that the ignition coil is faulty.

The following is a list of potential causes that could be causing your dirt bike to sputter:

1. Worn Gaskets or seals

There are a number of different seals and gaskets located within an exhaust system. If any of them are worn, then it is possible that they will cause the engine to sputter.

Seals and gaskets eventually become worn out and need to be replaced because of this gradual wear and tear.

It is possible that if you do not change it at the specified period, it can cause damage to the exhaust manifold, which is a lot more costly to repair than these gaskets.

2. Dirty Fuel Injectors

Gasoline injectors distribute the fuel spray throughout the cylinder itself. Spattering can occur in the engine if the injector nozzle becomes blocked over time.

This can be avoided by keeping the injector nozzle clean. In addition to that, it will also result in a reduced rate of acceleration.

That will eventually become the excuse for not having sufficient power. The problem can be fixed by cleaning the fuel injectors on a regular basis.

3. Malfunctioning Oxygen Sensors

Oxygen sensors are used to figure out if the exhaust gases coming out of the combustion chamber are too rich or too lean.

This information is used by the system in the bike to make adjustments to the quantity of fuel that is introduced into the engine cylinder.

It’s possible that the engine sputtering is caused by a dirty sensor that can’t do its job right.

To avoid this problem, the batteries in oxygen sensors need to be changed on a regular basis.

4. Dirt in Mass Airflow Sensor

In a fuel injection system, the role of a mass airflow sensor is to monitor the amount of air that is entering the system.

Once the information is gathered, it is processed by the bike’s system, which determines how much fuel should be delivered to the combustion chamber.

If the mass airflow sensor is dirty, it will not be able to communicate the right data to the vehicle system, and the vehicle system will not be able to determine whether or not there is sufficient fuel for the combustion chamber.

4. Bad Spark Plugs

You are undoubtedly familiar with the function that a spark plug serves. Spark plugs are the parts that are in charge of lighting the field in the combustion chamber on fire.

It will not be possible for the spark plugs to ignite the fuel in a clean manner if they are either not in operating condition or if they are unclean.

And as a result, this will become the explanation why the higher or Sparta test was missed. In this scenario, you will need to change the spark plugs because they are unclean.

4. Leakage of Vacuum

The engine may sputter if there is a leak in the vacuum system. This can be a dangerous situation.

When the issue becomes more severe, it is really necessary to address it as soon as possible.

5. Failing Catalytic Converter

If there is a problem with the engine sputtering, then the dirt bike will not operate smoothly and it will smell like rotten eggs. The catalytic converter in question is malfunctioning, which is the source of this odor.

If, for some reason, the catalytic converter is not functioning properly, it will not be able to destroy the hydrocarbons that are present in the exhaust nor will it be able to break down the sulfur that is produced by the engine.

As a consequence, there will be a pungent odor of rotten eggs. In the end, the dirt bike will not start, and this catalytic converter will be fully obstructed.

6. A leak in Exhaust Manifold

The engine may sputter and bog down if there is a leak in the exhaust manifold. This condition can also cause the engine to make a greater amount of noise. In addition to this, it brings about a drop in the engine’s performance.

The release of hot gases can melt the plastic components of a vehicle that has a cracked exhaust manifold, making it an extremely hazardous situation for drivers. Additionally, it will result in the emission of exhaust fumes.

How To Fix Dirt Bike Sputtering?

Check Spark Plug

First of all, I would suggest you check the efficiency of the spark plug you have in your dirt bike. To inspect the spark plug you need to remove it and from the wire.

Now look for the tip of the spark plug. If you see the condition of the tip to be wet then it needs to replaced.

This condition indicates that the spark plug has failed. Then it needs more fuel for ignition and efficiency is decreased so required more fuel and hence to match the performance it sucks over fuel and mileage become very bad.

If fuel is being delivered too much consistently then the sound of sputtering often can be rd while acceleration.

When we take the reverse condition when engine going through the lean fuel situation that also causes sputtering and results in to wet spark plug. Here I will recommend you to change the spark plug.

Check and clean the carburettor

Next step you can go to check the spark carburettor.  For the inspection of a carburettor, you need to remove the carburettor. Take the carb off the bike and now you have to remove the screws from the bottom of the carb. After this step, you will need to unscrew 2 more.

The bigger screw is the primary jet and smaller screw is the pilot jet which is also called a secondary jet. Now for the safety, you need to wear gloves in your hands and need to clean holes of the jets and apply the carb cleaner through the entire carburettor.

Now you use the compressed air to blow the dirt and junk or debris that could be stuck in the jets or at the bottom bowl inside the carburettor.


Sputtering by name does not seem to be a danger issue but it can lead to a serious problem if not resolved. Source of this problem can be anywhere whether it can be a spark plug or carburettor.

It can be an issue of the fuel injector, leak in the exhaust manifold or leakage in a vacuum. Your query why is my dirt bike sputtering has been given a clear vision about its solution.

Apart from this, we have also shared what are the reason for this issue and different types of sources which can be failed due to this. I hope you like this post. Have a safe ride.

Sources: Is your engine sputtering?