How to adjust the carburetor of the chainsaw

How to adjust the carburetor of the chainsaw

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The carburetor of the chainsaw is a fundamental element of this accessory. It follows that its malfunction or its ineffective adjustment could compromise the ordinary function of the chainsaw, up to compromising - in the most serious cases - its safety in its use.

Since this is a particularly delicate and potentially very harmful product, it is therefore essential to worry about adjusting the carburetor of the chainsaw, always asking for qualified support if you do not have the knowledge to be able to proceed in complete autonomy.

That said, in this study we will try to understand how carry out the adjustment of the carburetor of a chainsaw, and we will share a lot of useful information to improve the knowledge with this accessory!

What is the carburetor of the chainsaw for

Let's start with some necessary premise, for the main benefit of those who do not have much technical knowledge on the operation of the chainsaw.

In particular, we immediately state that the carburetor of a chainsaw its main objective is to control the output of fuel in the engine of the tool, and to regulate how much fuel and how much air flows in the chamber of the same engine.

Considering this fundamental function, it follows - we repeat - that if the carburetor does not work properly, then the engine will end up causing even serious failures to its chainsaw, up to compromising its ordinary usability and safety.

On the other hand, one correct adjustment of the chainsaw carburetor will allow this accessory to produce maximum power, reduce idle smoke and extend the engine's duty cycle.

In short, in the event that the carburettor does not work properly, the burn will end up not producing much heat. As a result, the power will be weak and the partially burnt mixture will be expelled into the silencer and will come out of the saw as smoke.

Some good reasons, in short, to try to investigate this issue and lay the foundations on how to adjust the carburetor of a chainsaw.

What it takes to adjust the carburetor of a chainsaw

Now that we have some more information about the function of a chainsaw carburetor, we can take a small step forward and understand what we need to be able to carry out this adjustment operation.

Apart - of course - the chainsaw on which to intervene, such an operation will require at least fuel, an Allen key, a screwdriver, brushes and possibly a new air filter, should it be necessary to replace it.

How to clean the chainsaw

Before proceeding with the adjustment of the chainsaw carburetor, it is necessary to unscrew the black handle, and remove the cover that protects the air filter, which is generally placed just above the accelerator.

You will then have to proceed with the cleaning operation, through the use of a brush and a small amount of fuel. So, in the event that the air filter is too dirty, or too worn, or even damaged, it will be possible to proceed with the replacement of the air filter.

In order to remove the muffler cap, you can help yourself with an Allen key. It will then be necessary to remove the screen and clean it thoroughly with a brush. Then, you can proceed with turning the transformer at idle for a few minutes, making it warm up. You can then take the screwdriver to remove the screws that are located above the clutch cover.

How to make the adjustment

We therefore arrive at the actual regulation phase. First, it is certainly advisable to start adjusting the neutral. Just screw the bottom marked "LA" and continue until the chain begins to move independently.

Then, you can proceed with the unscrewing counterclockwise, until the engine of the chainsaw stops. Furthermore, it will finally be possible to adjust the carburetor by unscrewing it anticlockwise, for a quarter of a turn.

Once this is done, the chainsaw can be turned again by adjusting the screw to the minimum so that the device can operate at this speed without problems.

The ignition

Once the above has been done, it will be necessary to proceed with adjusting the low speed, marked with the letter “G”, screwing it clockwise until the moment when the screw stops. At this point, loosen the latter with a quarter of a turn and adjust the screw L again. Screw it clockwise, until you hear a noise coming from the chainsaw engine.

At this stage, turn the screw back another quarter turn and adjust the screw G as you did before. You will then be able to start the saw at low speed and hear the engine during the "neutral" state. Adjust the neutral as per the previous step.

Video: Stihl Chainsaw Carburetor Adjustment (July 2022).


  1. Halomtano

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  2. Mayne

    An interesting topic, I will take part. I know that together we can come to the right answer.

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