How to adjust husqvarna chainsaw carburetor?

How to adjust husqvarna chainsaw carburetor?


Adjusting the carburetor of a Husqvarna chainsaw is an essential maintenance task that can help optimize the performance of the tool. A properly adjusted carburetor ensures efficient fuel combustion, smooth operation, and prevents potential engine damage. In this article, we will explore the step-by-step process of adjusting the carburetor on a Husqvarna chainsaw to achieve optimal performance.

Understanding the Carburetor

Before diving into the adjustment process, it is crucial to have a basic understanding of how the carburetor works. The carburetor is responsible for mixing air and fuel in the correct ratio for combustion. It consists of various components, including the idle speed screw, low-speed needle, high-speed needle, and throttle valve.

Materials Needed

To adjust the carburetor of your Husqvarna chainsaw, you will need the following materials:

– Screwdriver set
– Tachometer (optional but recommended)
– Husqvarna chainsaw owner’s manual

Step-by-Step Carburetor Adjustment Process

Step 1: Preparation
1. Ensure that the chainsaw is turned off and the engine is cool.
2. Locate the carburetor adjustment screws. These are usually located on the side of the carburetor and are labeled “H,” “L,” and “T.”

Step 2: Initial Settings
1. Consult your Husqvarna chainsaw owner’s manual to determine the initial carburetor settings specific to your model.
2. Set the idle speed screw (labeled “T”) to the recommended idle speed specified in the manual.

Step 3: Low-Speed Adjustment
1. Start the chainsaw and let it warm up for a few minutes.
2. Locate the low-speed adjustment screw (labeled “L”) and turn it clockwise until it lightly seats. Then, turn it counterclockwise 1.5 turns as a starting point.
3. With the chainsaw running at idle, slowly turn the low-speed adjustment screw counterclockwise until the engine runs smoothly and accelerates without hesitation. Avoid turning the screw too far counterclockwise to prevent the engine from running too lean.

Step 4: High-Speed Adjustment
1. With the chainsaw still running, locate the high-speed adjustment screw (labeled “H”).
2. Gradually increase the engine speed to full throttle and observe the chainsaw’s performance.
3. Turn the high-speed adjustment screw clockwise until the engine starts to lose power or run unevenly.
4. Slowly turn the high-speed adjustment screw counterclockwise until the engine runs smoothly and reaches its maximum power without hesitation or excessive smoke.

Step 5: Fine-Tuning
1. Test the chainsaw’s performance by cutting through a small log or piece of wood.
2. If the chainsaw exhibits any issues, such as hesitation, rough running, or excessive smoke, make slight adjustments to the low-speed and high-speed screws to optimize performance.
3. Repeat the fine-tuning process until the chainsaw operates smoothly and efficiently.


Adjusting the carburetor of your Husqvarna chainsaw is a crucial maintenance task that can significantly impact its performance. By following the step-by-step process outlined in this article, you can ensure that your chainsaw operates smoothly, maximizes fuel efficiency, and prevents potential engine damage.