Pit Bike Smoking: 6 Major Causes (Explained For Beginners)

If your pit is having a smoking issue and you keep riding the same bike, you could end up making problems for yourself and your bike that aren’t necessary. This could happen if this problem comes up out of the blue.

If you follow the instructions I’ve provided, you’ll be able to fix this issue on your own. There are as many ways to fix this issue as there are colors of smoke from your pit bike.

The smoke that is produced typically consists of three distinct colors, such as white, blue, black, or a grayish color.

The reasons behind all these vary and I will tell you about that in this article.

Why Is My Pit Bike Smoking?

There are a number of potential causes of smoke coming from a pit bike, including broken piston rings, an engine that is running too lean, a blown head gasket, an excessive amount of oil, or a crank seal that isn’t functioning properly.

Find out what the root cause of the smoke coming from the dirt bike is before you start looking for a remedy. The following are a few considerations that might be of use to you.

1. Piston rings:         

It is by far the most common cause of pit bikes’ smoke emissions. Its main job is to separate the oil used for lubrication from the mixture of air and fuel in the cylinder.

If this component of your pit bike is not working properly, your vehicle may experience issues with the lubrication, air, and fuel all mixing together, which will result in a great deal of smoke.

As a result of this problem, black smoke has been produced. This could be the result of excessive friction between the piston rings.

2. Contamination:             

The formation of smoke that is often a blue color can be caused by the utilization of undesirable oils as combustion fuel or the mixing of these oils with combustion fuel.

It is possible that the presence of any polluted chemical within the engine is also the source of this type of smoke.

Because there is not enough room for expansion, the pressure inside the cylinder of the engine is continuing to rise.

3. Bad exhaust gasket:             

If the exhaust pipe is totally blocked with oil and you haven’t cleaned it for a lengthy period of time, then there is a possibility that smoke will be produced from it.

4. Cool temperatures:          

During the initial stroke of the engine, it is normal to see white smoke when the surrounding environment is chilly.

But if the amount of white smoke coming out of your machine keeps getting worse, it may be because oil is getting into it.

5. Power valves:         

The smoke coming from your pit may also be caused by power valves that are dirty or uncleared.

The power valves on a bike are often intended to smooth out the power output, but when they are used, they become dirty.

Because of this, you need to check for power valves once, and then clean them. If you do this on a consistent basis, then the condition of your bike will be good.

6. Air filters:         

If the air filter is unclean, then the combustion system will not be able to get any fresh air.

It is recommended that you clean them or replace them if they are stuck. The majority of the problem is caused by air filters.

Different Colours of Smoke and its Meaning:

When you look at the exhaust system, you will notice that various types of smoke are being expelled. Let’s investigate the implications and effects of it.

1. White smoke:              

The explanation for this is very neat, and it’s something that most people have encountered before. Usually, this is a sign that there is water present. The reason for this is that there is water vapor in the exhaust system.

When a dirt bike is started, the exhaust typically begins to warm up, and once the entire exhaust system has warmed up, it vaporizes all of the steam that is contained inside it in the form of smoke.

If you see bouts of white steam coming from the silencer, it may be due to other reasons, and you need to stop riding it and take your bike to a nearby mechanic shop.

I make sure that if you don’t stop the bike immediately, then you will be the reason for the damage to your engine.

So if you see white smoke after the start up, you need to understand that it is just steam.

But if you see white smoke coming from the silencer in bouts, you need to understand that it is just

If it is at all possible, you should check for engine leakage. There is a possibility that the engine is leaking, which would result in white smoke.

Black smoke                   

This is a result of an excessively rich fuel mixture. At the point of ignition, the contaminated fuels are unable to burn, and the byproduct is expelled into the exhaust system.

Therefore, because the air-to-fuel ratio is lower than what is required for manufacturing spark, it burns up in the chamber where it is burned because of this.

Other potential causes include a clogged fuel return pipe, a faulty oxygen or air flow sensor, a leaking fuel injector, or a fuel regulator that is stuck in its open position.

Adjust the carburetor on your pit bike if it has one, but if it has fuel injection, check the fuel return line. If your pit bike has fuel injection, adjust the carburetor.

Blue or greyish smoke                 

This particular kind of smoke is most frequently seen emanating from the dirt bikes. The cause of this is typically the presence of undesired fuels, which, when mixed with fuel and air, participate in the combustion process.

If it is a two-stroke engine, which you probably aren’t familiar with, let me explain how it works: in a two-stroke engine, all five cycles—intake, compression, ignition, combustion, and exhaust—are completed in two strokes of the piston.

If your engine is a four-stroke engine, on the other hand, oil builds up behind the piston rings, which causes blue smoke.

If your engine is a two-stroke engine, the blue smoke is normal because oil is mixed with

It’s not like you have to overlook the fact that it’s a four-stroke engine because this solution is such an easy way to fix the issue.

Pistons typically contain rings that allow them to ride up and down and create compression forces; however, these rings might fail to function after being used for an extended period of time, which can result in the production of a form of bluish gray smoke.

If you are unable to locate the weak spots, it could lead to a dangerous situation. If oil leaks from any portion of your bike, the underlying cause may be burning wires within the dirt bike, which can result in an accident involving fire.

How to Fix White Smoke

Now that you know what produces white smoke, it’s time to look at how to remedy it using the procedures that are listed below.

1. Confirmation: 

You have to make sure that the white smoke is actually steam, which is produced whenever an antifreeze ingredient like water is burned in the cylinder.

After you have confirmed something, you need to check to see if there is any oil present; if the liquid has a milky appearance, this indicates that water has been combined with oil, and as you are well aware, oil and water do not combine.

However, if the oil is present in the cylinder, the two liquids are churned together, which results in a whitish consistency.

2. Check for the temperature:           

You should first check the temperature, and if it is less than 50 degrees Fahrenheit, it’s fairly normal till you start up your bike. This is because the most typical reason behind the white smoke emission is that low temperatures.

If there is a lot of white smoke coming out of the exhaust despite the engine being warmed up, then it is more likely that there is water getting into the engine. I have told you this before.

3. Monitoring:

You should make it a habit to check your bike’s cylinder, piston rings, and seals often to see how they are doing.

In the event that they are filthy or in poor shape, it would be in your best interest to refrain from using your bicycle and instead bring it to a carpenter for repair.

How To Resolve Blue Smoke?

If the bike is giving out blue smoke, you might need to replace some of the parts.

1. Inspect spark plugs:

If your bike is giving out blue smoke, you need to check the spark plugs, and you can tell if the bike has the correct ratio of oil to gasoline by simply looking at the spark plug and determining whether or not there is a layer of black soot or film.

2. Check for Valve seals and piston rings status:                 

If the piston rings are broken or the seals have come loose, blue-gray smoke will come out. In any of these cases, you should either tighten the rings or replace them with new ones.

You need to look into the problem carefully to find out what’s wrong, because if the wires get too hot, they could start a fire inside the bike.

How To Stop Black Smoke?

The majority of the time, it is because of obstructions or broken pieces in the system.

Verify the following part to determine which one is responsible for making this possibility exist.

1. Air filters:                      

The most common cause of black smoke is air filters that are blocked with debris.

Routinely check for any damage to the air filters, and either clean or replace them if they are in any way compromised. Keeping them clean will also increase the mileage of your bike.

2. Piston rings:

As I mentioned before, this is one of the factors that contribute to the formation of black smoke.

So, it needs to be checked often and if any of the parts are broken, they need to be replaced.

3. Fuel additives:

As I mentioned before, this is one of the factors that contribute to the formation of black smoke. Therefore, it needs to be inspected on a regular basis and replaced if any of the components are broken.


I am positive that I have covered everything there is to know about the subject, and perhaps this has provided you with the information you need to figure out how to resolve the issue.

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