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How to adjust the carburetor on a chainsaw: recommendations

The carburetor of the chainsaw is one of the main components of this tool. He is responsible for supplying fuel. The efficiency and power of the equipment depends on how well the node functions. Timely adjustment allows to provide also economy.

Before setting up the carburetor on a chainsaw, you should find out that adjusting this part of the device is quite rare. As a rule, the factory setting is sufficient for normal operation. However, if more precise adjustment is required, you can use special screws. Before the beginning of such works it is necessary to understand the subtleties and nuances of the process.

When carburettor adjustment is required

If it has happened that the adjusting screws have been loosened, the carburettor must be adjusted. The need for these manipulations can also indicate other signs, among them:

  • Breakage of the protective cap;
  • Significant wear of the piston;
  • Interruptions in the work of the motor;
  • Strong vibration;
  • No response from the engine when trying to start a tool;
  • Increase in fuel consumption;
  • Strong exhaust.

Additional signs

If there was a piston wear, it will be necessary to carry out also repair of the motor, but the adjustment of the carburetor will act as a temporary measure, while the unit will work more stably. If the described node was clogged, which led to a malfunction in the motor, then it will be necessary to carry out the washing as well.

Whereas when a situation arises when the engine stalls or does not start, we can conclude that the working mixture was depleted. On incomplete combustion of the fuel mixture also indicates a plentiful exhaust. This conclusion can be reached if the instrument began to spend fuel in excessively large quantities.

Preliminary manipulation

In order to get to the carburetor, bolts are loosened on the tool cover. The case must be opened with foam rubber, and parts of the air filter must be removed. Only now you can start adjusting. Before setting up the carburetor on a chainsaw, you should find out that the main task of these jobs is changing the quantity and quality of the fuel-air mixture, which is injected into the combustion chamber of the motor.

During the work you must follow certain rules, among them:

  • Chain must be directed to the side;
  • Equipment should be laid on a flat surface;
  • Cutting parts must be removed to a safe distance.

The first requirement is due to the need to exclude injury. If you are wondering about how to adjust the carburetor on a chainsaw, you should be aware that you need to perform this work using three screws. The first one controls the jet and is designated by the letter "H". It is necessary to adjust the maximum speed.

The second screw can be found by the letter "L". This node is necessary to control the idler at low shaft speeds. Quite often novice masters are wondering about how to adjust the carburetor on the chainsaw "Partner". In it, the third screw is designated by the letter "T". It is needed to adjust the idling speed. The adjustment process is divided into the following stages:

  • base;
  • final.

The first is conducted with the engine off, while the second one is on the warmed-up engine.

Basic adjustment stage

First, you need to use the speed screws. They are wrapped clockwise until they stop. Then turn it back one and a half turns.

The final stage

Before setting up the carburetor on the Husqvarna chain saw, you need to find the third screw, which is indicated by the letter "T". Then the engine warms up for 10 minutes at medium revs. The third screw must be turned counterclockwise, waiting for the motor to start working steadily. The chain must be stationary.

If the motor stalls at idle, the screw must be turned clockwise. When the target moves, the screw is twisted back. If you are faced with the question of how to adjust the carburetor on the chainsaw, the next step is to check how correctly the engine works at maximum speed during acceleration. It should be assumed that the engine is operating correctly when accelerating, if the accelerator accelerates to a maximum value between 2800 and 15000 when pressing the accelerator. The screw marked "L" must be turned to the left for an eighth turn.

Correction of the maximum number of revolutions

Before setting up the carburetor on the partner 350 chainsaw, you must find the screw "H". It is necessary to adjust the maximum speed. Rotate it clockwise, whereas if it is necessary to reduce the number, the movement of the screw must be directed in the opposite direction.

You should set the maximum frequency in the range from 11,500 to 15,000 rpm. If this value is exceeded, the motor will run for wear, which will certainly lead to a malfunction when ignition. When rotating the screw under the letter "H", you need to consider how the ignition occurs. If malfunction occurs, the rotation should be stopped by turning the screw counterclockwise.

Idling test

You need to know how to adjust the carburetor on a Chinese chainsaw. In this case, a second check is carried out at idle. Once the adjustment in the acceleration mode has been completed, it is necessary to bring the tool to idle. If you did everything correctly, the chain will remain stationary, and the motor will quickly gain momentum when you press the accelerator.

You should also listen to the engine. The sound should be similar to a four-stroke unit. If you are thinking about how to properly adjust the carburetor on a chainsaw, then you should take care that the above conditions are met. If this is not the case, the adjustment must be repeated, and the basic step is omitted. Do not get down to work if you do not have enough experience, because in this case there may be a misalignment of the site. When self-adjustment is not possible, then stable work can be achieved by contacting professionals.

Nuances of adjusting the carburetor chainsaw brand "Calm MS 250"

You may have a question about how to adjust the carburetor on the chainsaw "Calm". To begin with, it is necessary to decide when such a need arises. The described work may be required if spark plug electrodes have changed color. When it turned black, it indicates re-enrichment, whereas with a brick-gray color one can be calm, as this is the norm. When the master notices a white coating, he can be sure that the mixture is depleted.

The main role in the adjustment is played by the upper screw, it is closer to the silencer in the described model. If you follow the factory parameters that you can find on the tool cover, then this screw must be unscrewed for one turn, and after the adjustment is made. When unscrewing, the mixture will be enriched, whereas if the screw is screwed, the mixture will be depleted, and a smaller amount of gasoline will enter the air-fuel mixture.

Recommendations of the expert on work with the carburetor of the chainsaw "Friendship"

Before setting up the carburetor chainsaw "Friendship", you must carry out maintenance of the tool. It involves flushing the engine, cleaning the carburetor, replacing the spark plug, checking the chain tension, cleaning the air filter, warming up the engine and adjusting the idling speed. Once the screws "H" and "L" are wrapped up to the stop, they must be turned out one turn. Do this with a muffled chainsaw.

The tool then warms up, full throttle is given, and the first of these screws rotates in such a way as to reach 14,000 revolutions per minute. The maximum speed should be kept for 10 seconds or less.

The method of rotating the last screw should ensure that the chain begins to move. Then the bolt turns a quarter of a turn counter-clockwise. If after that idling turns were not so stable, and the tool accelerates slowly, the screw under the designation "L" must be turned counter-clockwise, only then the chainsaw will gain momentum.

It is important to remember that the adjustment will not work if the air is sucked from the side into the engine. It can happen through:

  • The accelerating pump;
  • carburetor;
  • Gasket under the carburetor;
  • Crankshaft oil seals.

After completion of the procedure, the motor of the tool can be started by heating it for 10 minutes. In this case, you can set the average speed. Then you can tackle the idle screw.


To carry out the work you will need not only an even surface, but also a tachometer, through which you will be able to determine the irregularities in the operation of the regulated unit. When the screws rotate, the sound should be smooth, if you notice a squealing note, this indicates that the mixture is oversaturated.

If you do not have enough experience, before starting work, you need to familiarize yourself with the principle of the carburettor, which functions in the same way as an internal combustion engine. This provokes a small explosion that occurs in the ignition cylinder of the mixture. Pressure from this process pushes the piston, which rotates the crankshaft. The movement develops into a rotation, which moves the chain through an asterisk. At optimum operation the engine consumes up to 10 mg of fuel in each cycle. While the mixture for the motor is prepared in the carburetor.

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