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How to Adjust Chainsaw Carburetor in 3 DIY Steps?

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Chainsaws are one of the most popular power tools in America, but chainsaw owners often don’t know how to properly maintain their tool. They may not be aware that they can adjust the carburetor for different types of wood or fuel sources.

Why and how to Adjust a Chainsaw Carburetor is important for proper engine performance? Because adjusting the carburetor can ensure proper engine performance and help to troubleshoot problems that arise with your saw.

Steps on How to Adjust a Chainsaw Carburetor:

These Are the Steps on How to Adjust a Chainsaw Carburetor

Step 1: High Speed Air Screw

Remove the spark plug and look for the screw on top of the spark plug cap. This is called a high-speed atmosphere screw, also known as an accelerator pump adjust.

The rich speed air screw controls the amount of air allowed into the fuel injector. You can find this screw on top of the engine and it’s connected directly to the throttle trigger.

The high speed atmosphere screw is set to the correct adjustment position when it just begins to choke off the engine when you rev up the throttle.

You will need a flathead screwdriver, but make sure it is not sharp enough to damage anything inside your engine case.

Step 2: Idle Speed Screw

Use a flathead screwdriver to turn the idle speed screw adjustment clockwise until it begins to choke off your engine at idle. This step adjusts how well your chainsaw idles under different conditions.

Adjust this setting helps get rid of popping and stalling that occurs during use of changes in weather or petrol type. The lean or idle speed adjustment screw is on the side of your chainsaw’s engine, making it easy to access.

Once you have finished setting the high-speed adjustment mien screw and idle speed adjustment screw, your saw should start up faster and run more smoothly. 

Step 3: Low Speed Air Screw

Use a flathead screwdriver to turn the low-speed air screw clockwise until it begins to choke off your engine when you rev up the throttle. This step adjusts how well your chainsaw runs at full power.

The low speed adjustment wind screw is also located somewhere around the fuel injector area, but it’s difficult to see from under the handlebars.

Once you have finished adjusting all three adjustment screws, test out how well your machine runs. The last step should have your chainsaw running more swimmingly and powerfully.

If you have problems with your chainsaw after carburetor adjustment, go back to the first part of the process. If it was difficult for you to access any of these adjustment screws, try cleaning them first before trying again.

After following these steps, you will be able to make a carburetor may adjustment on your machine properly so that it runs at peak performance. You should use the instructions above as a reference only.

These Are the Benefits of Adjusting Chainsaw Carburetor:

These Are the Benefits of Adjusting Chainsaw Carburetor

• You can save money on gas and increase engine performance at the same time.

• Chainsaw starts faster and runs more efficiently.

• Your chainsaw is at peak performance for cutting wood or brush.

• It is an important step for machine maintenance; it’s advisable to do it after every twenty hours of use, or whenever you drain your fuel tank.

• Chainsaw owners who have adjustment problems with their saw’s engine performance or starting can adjust the carburetor to get a better engine response and long-lasting use of this power tool.

Additional Factors Related to Chainsaw Carburetors

Additional Factors Related to Chainsaw Carburetors

1. Carburetor Tuning

Carburetor tuning is another important step for chainsaw owners and enthusiasts. The fuel injector regulates the petrol and wind intake which causes the engine to run. A tune-up on a chainsaw will help it to run better and more easily.

Fuel injector tune up can be done in one of two ways, either by atmosphere adjustment screws or by changing the needle valve adjustment.

2. Conditions of Lean Running

One of the typical problems that saws go through is lean running or low speed. Lean running will cause your chainsaw to lack power and it can also cause pre-ignition.

This condition makes the engine run lean efficiently and it can be caused by a number of different factors or conditions, including:

  • A clogged air filter
  • Obstructed or dirty fuel line
  • Dirty oil inside the bar and saw

3. Conditions of Rich Running

If your engine is running rich, it will have issues spewing out of the muffler. In these engines, there is too much atmosphere in the fuel mixture and not enough petrol. This causes smoke to come out of your muffler or exhaust system at high speed.

This causes poor performance and stalling. One of these conditions will cause rich running:

  • A leaky fuel tank seal or cap
  • Water in your fuel mix

4. Two-stroke and Four-stroke Engines

Chainsaws have a two strokes engine and a four strokes engine. In the case of a two stroke engine, it is important to know that you should use a gasoline and oil mixture in order to get your saw going correctly.

In the case of a four stroke engine, it is not necessary to mix gas and oil for these engines to run easily.

carburetor adjustment


01. How Come My Chainsaw Dies When I Put Gas in It?

Putting in fresh gas will not cause your engine to die unless the gas is extremely old or if it’s another fuel mixture type. If you are putting in new gas, try draining your old tank and replacing it with fresh gasoline.

If this doesn’t work, then you probably have a more serious problem with your petrol or gas injector.

02. How Often Should I Check My Fuel Mixture Lines and Air Filter?

If you always keep your saw appropriately maintained and in good working order, it is advisable to inspect the fuel mixture lines and air filter after every twenty hours of use or when you drain your tank.

Cleaning these components will help with engine speed performance and prolong the life of your saw.

03. When Is It Appropriate To Change A Chainsaw’s Carburetor?

You will need to change your chainsaw’s carburetor if it’s excessively smutty, or just worn out after 100 hours of use.

Replacing your carburetor might be necessary if you’ve done some engine modification for speed, or if the current one is not working rightly.

04. Which Tools Will I Need to Change My Carburetor Adjustment?

If you are changing your chainsaw’s carburetor yourself, make sure that you have the proper tools before beginning this procedure.

You will need a screwdriver, crescent wrench or socket wrench, fuel line pliers and an Allen wrench.

05. Where’s the Carburetor on a Chainsaw?

The carburetor is near the exhaust and intake ports on your engine. You can find the intake, gasoline and exhaust ports on the engine.

The fuel injector is on the front of the engine. The location of the gasoline injector makes it easy to get to for regular maintenance and cleaning. The following steps will lead to better performance without any hesitation.


The chainsaw carburetor, or the mechanism that helps regulate fuel and mien intake to your engine, is an important part of maintaining a healthy saw.

The article provided information on how you can tune up your carburetor as well as what causes conditions such as lean running and rich running.

Consider reading this article if you are experiencing these problems; you might be able to save money and time in the end!

Another Resource: Logs Holding Methods while Cutting with Chainsaw

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