Husqvarna Chainsaw Carb Adjustment (The Right Way)

One of the most common reasons that cause a Husqvarna chainsaw to stall or lag is improper carburetor adjustment. By ensuring the correct adjustment, you can make your chainsaw more effective than ever. 

There are three adjustment screws on every Husqvarna chainsaw that you can use to optimize it. The screws are labeled as L, H, and T, which stand for low-speed adjustment screws, high-speed adjustment screws, and idle adjustment screws, respectively. 

If you want to know more details about the process, make sure to go through the entire article. 

Husqvarna Chainsaw Carburetor Adjustment Diagram

Depending on the model you have, the adjustment screws can be anywhere on the cover. The best way is to use the chainsaw’s user manual to determine the location and then use the proper equipment to adjust the screws.

husqvarna chainsaw carburetor adjustment diagram

Husqvarna Chainsaw Carburetor Adjustment: Step-By-Step Process

The first thing to do is to take your chainsaw to a well-ventilated area. Keep the saw on an even surface and position it in a way so that you can easily access the screws.

Make sure not to use the chain brake. The chain has to move when adjusting the screws. Now, let’s go through how you can adjust your chainsaw carburetor

Step 1: Adjust the ‘L’ Screw

Start your chainsaw and use the screwdriver intended for your carburetor screw to turn the L screw clockwise. Keep turning it until the engine nearly stops. Now, start turning the screw anticlockwise till the engine is running smoothly. 

You can check whether the adjustment is right by using the throttle. If you feel a smooth acceleration, it’s a sign that the screw is in the right place. 

Step 2: Adjust the ‘T’ Screw

Now, turn the idle screw clockwise. The chain should begin to spin. Next, you need to turn the T screw anticlockwise and stop at the exact moment when the chain stops moving.

When adjusting the idle screw, recommends using a tachometer to ensure that the RPM is optimal. The tachometer should read the 2700 RPM speed rate.

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Step 3: Adjust the ‘H’ Screw

The high-speed carburetor screw is an important and tricky screw to adjust. First, you will have to turn the screw anticlockwise as far as you can. But make sure not to force the screw. You will notice the engine sounding rough. 

Now, turn the screw clockwise until the engine reaches a point where it gives you smooth acceleration and better sound.

Why Proper Carb Adjustment Is Necessary?

When the chainsaw is delivered to you, the carburetor is usually tuned. However, the adjustments lose their accuracy over time. So, they need some changes. 

Proper carburetor adjustment is the key to efficiently operating the tool and protecting the engine’s integrity. If you are not precise with the adjustment, the engine may struggle to turn on or stay on. Wrong settings can also make the saw dangerous to use. 

If you are crossing the compatible RPM with your chainsaw’s carburetor settings, it may cause permanent damage to the engine. So, don’t forget to use a tachometer. It’s an affordable tool that will come in handy in many situations. 

In case you have a Stihl chainsaw, you can also check out my article on Stihl chainsaw carburetor adjustment.

Husqvarna Carburetor Adjustment Tool

A flat-head screwdriver is suitable for adjusting the carb on your Husqvarna chainsaw. If you don’t have that, you can get one online to make the adjusting procedure easier.

In addition, it’s also a good idea to get a tachometer to check that you’re not exceeding the compatible RPM level of your chainsaw. Here are my three recommendations you can go for:

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Safety Tips

  • Make sure there’s no fuel leakage before adjusting the carburetor screws. 
  • Use the proper tools.
  • There will be a stopping point on each screw. Make sure never to cross them while turning the screws to avoid engine damage. 
  • Use a tachometer to ensure that the chainsaw carburetor adjustments are not beyond the recommended settings. 
  • Always check the user manual before getting started. Avoid anything that the manufacturer instructed. 
  • Clean your chainsaw’s air filter before adjusting the carburetor. Make sure that you are not using a flammable product to clean the air filter. 
  • Keep the chainsaw on a flat surface so that the bar and chain do not touch the surface. 
  • Use earmuffs and do the procedure in a well-ventilated area. 


What does a carburetor do in a chainsaw?

The carburetor in a chainsaw is for mixing air and fuel before the mixture enters the cylinder. Adjusting the screws on a carburetor ensures that the chainsaw is operating with the highest efficiency without any delays. 

Where can I find the carb adjustment screws on my Husqvarna chainsaw?

Most Husqvarna chainsaws have their carb screws on their motor housings close to the pull rope. If you can’t find them, the best thing to do is to check the user manual of that particular model. 

What are the signs of a bad carburetor?

If your chainsaw carburetor has gone bad, there can be several issues. For instance, you may notice black smoke coming out of the exhaust, the engine may struggle to start and stay on, and the engine may overheat. 

Wrap Up

With a powerful tool like a Husqvarna chainsaw, you want it to be used at its best performance. When the carburetor is not tuned the way it’s supposed to, the chainsaw won’t perform well.

So, it’s important to learn the proper way to Husqvarna chainsaw carb adjustment before tweaking the settings. 

By adjusting the carburetor the proper way, you will not only improve efficiency but also lengthen the engine life.

Nonetheless, if you are making the adjustment by yourself, make sure to follow all the safety protocols to make the process as safe as possible for you.

Jim Boslice

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