Husqvarna 128 LD Trimmer Carburetor Adjustment (Step By Step)

Is your Husqvarna 128 LD trimmer bogging out while idling or when you give it throttle? Some minor adjustments to the carburetor can fix it!

The carburetor controls the flow of fuel inside the engine. It is important to have the correct fuel mixture for the trimmer to work properly.

In the article, we have discussed the different states in which your trimmer might be bogging down and how you can fix your trimmer by following the solution based on that state.

To give you a brief solution – You will need to adjust the “low” screw if the trimmer is having issues at idle speed, and the “high” screw if bogging occurs when you press the throttle.

Tools Required –

• Pacman screwdriver (comes included with the carburetor adjustment tool kit if you choose to buy the whole kit)

HOW TO ADJUST THE CARBURETOR?

Step 1: Figuring out the issue

First, you need to figure out whether the idle screw hasn’t been tuned properly or the high screw.

To find this, you need to observe when your trimmer bogs down. We have discussed the solutions to different conditions below. Make sure you first find the right problem and follow that solution.

Step 2: Locate the IDLE and HIGH Screws

Step 3: Tuning the Screws

TRIMMER BOGS DOWN WHEN GIVEN THROTTLE

If your trimmer runs fine when you turn it on (idle), but dies down as soon as you press the trigger to give throttle then follow the following steps:

1. Turn on your trimmer.
2. Place your Pacman screwdriver in the high screw.
3. Rotate the screw counterclockwise through one full turn.
4. Give throttle to check if there is any improvement.
5. Keep rotating slowly until you reach the point where the trimmer runs smoothly when you give throttle.

TRIMMER RUNS FINE BUT DOESN’T ACHIEVE MAXIMUM SPEED WHEN GIVEN THROTTLE

If your trimmer doesn’t bog down but doesn’t run at maximum speed, then follow the following steps.

1. Turn on your trimmer.
2. Place your Pacman screwdriver in the high screw.
3. Rotate the screw clockwise through one full turn while continuously giving throttle i.e., while keeping the trigger pressed.
4. Then keep rotating the screw slowly and observe the speed.
5. The speed should keep increasing as you rotate the screw.
6. The moment you feel like the speed has started to decrease, rotate the screw back a little, in the counterclockwise direction.
7. Stop at the point where you feel like the speed is the highest.
8. Your trimmer should now be running on maximum RPMs when given throttle.

TRIMMER BOGS DOWN IN AN IDLE STATE WHEN YOU RUN IT ON FULL CHOKE

In this situation, you might have noticed that in order for you to keep the trimmer running, you have to keep the choke half shut.

Follow the steps below to resolve this issue and get your trimmer to work without choke –

1. Turn your trimmer on while keeping the choke half shut.
2. Move the choke lever to full while squeezing the throttle trigger, so that the trimmer doesn’t bogs down.
3. Place the Pacman screwdriver in the low screw.
4. Rotate the screw slowly in the counterclockwise direction.
5. Release the trigger to check the condition of the trimmer.
6. If you see any improvement, i.e., if the trimmer does not turn off on leaving the trigger, then leave the screw tuned at that point.
7. Now move on to the high screw.
8. Insert the Pacman screwdriver in the high screw and once it is in place, start rotating the screw in the clockwise direction.
9. Check the trimmer after rotation through a very small distance. It should be running perfectly fine now in an idle state, even on full choke.

That’s about it. Hope this article helped you adjust your carburetor and is working fine without any problems now!