1. Ensure that the chainsaw is cool and not running.
2. Locate the carburetor on the right side of the chainsaw. It is a small, metal cylinder with several screws and adjustments.
3. Start by turning the idle speed screw (marked "L") clockwise until it is gently seated. This is the screw closest to the bottom of the carburetor. Do not over-tighten it.
4. Next, turn the high speed screw (marked "H") clockwise until it is gently seated. This is the screw closest to the top of the carburetor. Do not over-tighten it.
5. Start the chainsaw and let it warm up for a few minutes.
6. While the chainsaw is running, use a flathead screwdriver to adjust the idle speed screw (marked "L") until the chainsaw idles smoothly at a low speed.
7. Once the idle speed is set, use the flathead screwdriver to adjust the high speed screw (marked "H") until the chainsaw reaches its maximum power and speed without bogging down.
8. Allow the chainsaw to run at full throttle for a few minutes to ensure it is properly adjusted.
9. If necessary, make additional fine adjustments to the idle speed and high speed screws until the chainsaw runs smoothly at all speeds.
Remember to make small adjustments and test the chainsaw after each adjustment to avoid over-adjusting the carburetor. If you are unsure about how to adjust the carburetor on your Stihl 031AV chainsaw, consult the chainsaw's owner's manual or contact a qualified technician for assistance.
