Adjusting the carburetor of a chainsaw foreman standard. Adjusting the carburetor of a chainsaw with your own hands. Final check at idle

To independently adjust the carburetor, you need to familiarize yourself with its structure and remember the order of work that is carried out to adjust the parts responsible for the proper functioning of the component elements of the device and parts adjacent to it. You need to carefully handle objects to adjust the chainsaw system, and also determine whether the set parameters correspond to the maximum permissible values.

About the carburetor design

The carburetor is used to mix the combustible mixture with air in compliance with predetermined proportions. If the exact doses are not observed, the engine's proper functioning is at risk. When a large amount of air enters during mixing of components, but not enough fuel, then such a mixture is considered “poor”.

Oversaturation should not be allowed, since when large quantities fuel compared to air can also cause engine malfunction or wear. Carburetor adjustment is needed not only before initial use, but also when any deviations in its work are identified. Before starting to work with a chainsaw, do not forget to test it.

The carburetor design contains a standard set of elements, but may vary slightly depending on the manufacturer. Components:

The basis. This is a special tube that is visually similar to an aerodynamic design. Air passes through it. In the transverse direction, a damper is located in the middle of the pipe. Its position can be changed. The more it is extended into the passage, the less air enters the engine.
Diffuser. This is the constricted part of the tube. With its help, the air supply speed increases precisely in the segment from which the fuel comes out.
Channels for fuel supply. contained in the float chamber, then passes into the nozzle, from which it flows into the sprayer.
Float chamber. It is a separate structural element, reminiscent of the shape of a tank. Designed for continuous maintenance optimal level fuel liquid before entering the channel from where air enters.

What you need to have to set up and adjust a chainsaw with your own hands

Every carburetor owner should have necessary tools to adjust this system. There are three adjustment screws that are located on the body of the device. They have their own markings:

L - screw for correcting low speeds.
H - screw for adjusting high speed.
T - regulates idle speed, in most cases it is used for experiments.

Before adjusting the carburetor, you need to prepare the device:

The engine warms up, that is, it starts approximately 10 minutes before repair, and turns off when starting work (see).
The air filter is checked and washed.
The chain is stopped by turning screw T until it stops (see).

To carry out a safe repair, you need to prepare a flat surface where you can carefully place the device and turn the chain in the opposite direction. Need a tachometer. It determines whether there is a malfunction in the carburetor. When turning the screws, the sound should be perfect and absolutely smooth. If you notice squealing notes, the mixture is oversaturated.

How to properly adjust a factory saw

Carburetor adjustment is divided into two main stages. The first one is called basic. It is performed with the engine running. The second is performed when the engine is warm.

To complete the carburetor adjustment procedure successfully, You need to read the operating instructions in advance specific model to identify additional features device settings.

First stage

The adjusting screws for the highest and lowest speeds should be moved clockwise until the highest resistance is met. When the screws reach the stop, you need to move them to reverse side and leave while passing 1.5 turns.

Main stage

The engine turns on at medium speed and It warms up for about 10 minutes. The screw responsible for adjusting the idle speed should move clockwise. It is released only when the engine reaches stable operation mode. It is necessary to ensure that the chain does not move during this process.

In idling mode, the engine may stall (reason –). In this case, you must immediately turn the adjusting screw clockwise until it stops. Sometimes the chain starts to move. In this case, turn the adjusting screw in the opposite direction.

Checking acceleration operation

Need to do a little research. Acceleration of the device is initiated. It is necessary to evaluate the proper operation of the engine during maximum speed. When the engine is functioning correctly, it means When you press the accelerator, the speed quickly increases to 15,000 rpm.

If this does not happen or the increase in speed is too slow, you must use the screw marked L. It turns counterclockwise. Moderate movements must be observed, since the turn cannot be more than 1/8 of a full circle.

How to adjust the maximum number of revolutions

To limit this indicator, you need to use a screw marked H. To increase the number of revolutions, turn it clockwise, and to reduce them in the opposite direction. The maximum frequency should not exceed 15000 rpm.

If you make this figure larger, the device’s engine will wear out, which will lead to problems in the ignition system. When rotating this screw, you need to take into account the ignition processes of the device. If the slightest malfunctions appear, then the maximum speed value must be reduced.

Final check at idle

Before this procedure, it is necessary to perform a full adjustment components carburetor when operating at maximum speed. Next, you should check the functioning of the device in idle cold mode. When the correct adjustment parameters are achieved, you can notice the exact compliance of the carburetor design with the following criteria:

If violations are noticed in the given parameters or the device has not been fully adjusted, you need to perform the main setup step again. Sometimes actions are performed incorrectly. In this case, the device may fail due to the loss of the correct node settings. In this case, you will have to contact a specialist.

Disassembling the carburetor if necessary to check or repair components

The design of different carburetor models is almost the same, so when working with them you can use the standard scheme. All elements must be removed carefully, and then post in the order below so that you can successfully place items in place after the completion of repair work.

The top cover is removed. To do this, you need to unscrew the 3 bolts holding it in a circle.
The foam rubber is also removed, since it is the top integral part air conducting filter.
The fuel hose is removed.
The drive thrust is output directly to it.
The cable end is disconnected.
The gasoline hose can be completely removed if you systematically pull it off the fitting.

To finally prepare the carburetor for major repairs or replacement of the smallest parts, you need to carefully disconnect it from the main system. Sometimes further disassembly is required. Should be unscrewed constituent elements carefully and place fasteners in groups, as these small parts are easily lost.

How to properly adjust a Chinese-made saw - adjustment instructions

To correctly configure the carburetor of a Chinese chainsaw, you must first remember the factory settings of the device, then turn on the engine. Subsequently, you will have to leave it running for several hours in order to accurately set your own parameters. Sometimes work is carried out only after ten minutes of engine operation, but many Chinese-made models require special handling.

Adjustment procedure:

Activities start at idle. Using the adjusting screws, you need to achieve a systematic increase in engine speed, so you should first let it run at low speeds. A deviation from the norm is the movement of the chain along the bus. In this case, you need to adjust the outer screws to the optimal position so that the chain remains motionless.
The transition to medium speed speed is carried out. Sometimes the engine starts to smoke. This defect can be eliminated by tightening the screw to supply a leaner fuel mixture.
In this case, the smoke will disappear, but the engine speed will increase. You need to adjust the settings until you reach a level where, when you press the throttle, the engine smoothly picks up speed, and no sudden jerks or interruptions are heard.
The device motor is being checked. The chainsaw is switched to minimum speed, and then the lever is quickly pressed. When pressed maximally, it is held for 3 seconds. If there are problems with the engine, you need to gradually loosen the screw until the optimal position is reached.
The chainsaw should run for several hours real conditions . You need to engage, and then inspect all the elements involved in this event. If there are deviations, they must be corrected using adjusting devices. When all defects are eliminated and installed optimal settings to supply correctly concentrated fuel, the device setup process can be considered complete.

Conclusion

In order for the chainsaw to work properly, you need to carefully carry out the work of adjusting the carburetor in exact accordance with their order. If any malfunctions occur in the operation of the device, you must carry out the repair yourself. complete disassembly. In most cases, replacement of any parts that have become unusable is required.

By constantly checking the quality of carburetor settings and taking timely actions to improve its operation, problems with the chainsaw will not arise.

Many men have a chainsaw at their disposal. This tool can greatly make a person’s life easier when carrying out various construction work, as well as when sawing wood. Sometimes chainsaws break down; repairs and tuning often come down to adjusting the carburetor. This unit is the main one for the chainsaw. Setting it up is not that difficult.

The main thing is to strictly follow the instructions given below. She will definitely help you repair your equipment. Setting up a chainsaw should be carried out by special technical services, but this is quite expensive. Not every person is able to post a large sum for similar work. In order to set up a chainsaw, you need to select the necessary tools.

Tools required for work

You will need:

technical passport for a chainsaw;
tachometer;
screwdriver;
key.

This minimum set is quite enough to carry out the entire range of events. So, if everything is ready, then you can safely begin repairing the chainsaw and setting it up.

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Carburetor settings

So, you can adjust the chainsaw by repairing the carburetor. This is not exactly a repair, but simply some preventive measures that should be carried out as soon as possible. It all comes down to adjusting the position of the jets, which are located in this mechanism unit.

The chainsaw can be adjusted using special screws located on the jet. As a rule, there are only three of them. One of them is used to adjust low speed. The other two are used to adjust high speed and idle, respectively. Only can help comprehensive solution problems, since adjusting one parameter is quite difficult.

The first two screws, or rather the high and low speed regulators, are used to control the supply of the combustible mixture and air. Every person who is familiar with engines internal combustion, V mandatory must know how this process occurs in them. This supply is characterized by the opening of the throttle valve. If the speed is too high, you must turn the screw clockwise, and if you need to reduce the amount of fuel supplied, then you must turn it counterclockwise.

These measures will allow you to accurately adjust the equipment. A chainsaw with properly selected modes will definitely take your work to a whole new level.

The screw that is responsible for adjusting the idle speed works in a similar way. When it rotates counterclockwise, the number of revolutions increases, and when rotated counterclockwise, they decrease.

In general, by using just three screws, you can configure the chainsaw to optimal parameters and characteristics that are necessary to carry out a specific set of works.

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It is immediately worth noting that new chainsaw adjusted at the factory to maximum parameters. That is, it works at high and low speeds at maximum. It turns out that the most enriched mixture is formed. If we are talking about self-adjustment rpm, then you first need to start the equipment and let it run for several hours. It is not recommended to jump in and adjust the jet right away. It is quite possible that something will initially be faulty, and independent regulation may lead to the fact that the warranty will simply expire. Only after a complete check of functionality can you begin to work with the carburetor.

It is imperative to keep in mind that if we are talking about adjusting high speeds using a screw, then this directly affects the power of the equipment and the rotation speed of the saw. If the fuel mixture is lean, it will cause the chainsaw to start working at its maximum capabilities. This may subsequently lead to equipment failure. This is unacceptable, so you need to try to find a truly optimal ratio of all revolutions. A lean mixture causes the carburetor to work at its maximum capacity. In this case, the chainsaw may begin to choke, and this is unacceptable. Care and a competent approach are what a person needs when adjusting such equipment.

First, the saw needs to be warmed up. The high speed adjustment screw is then turned counterclockwise. The device should operate in this position for approximately 10 seconds. Now you need to take the tachometer. Such a device must be present in the arsenal of any man. When the revolutions are measured, the resulting value must be compared with what is indicated in the equipment passport. Only full compliance with the specified characteristics will allow the work to be brought to the correct level. Otherwise, you need to configure further.

The repairs are basically complete. However, if the chainsaw still does not work correctly, it is necessary to continue the adjustment. If the saw is not adjusted correctly, it will be immediately obvious. If the mixture is lean, the saw will begin to squeal. This can be heard when operating at any speed. In a situation where the mixture is too rich, unpleasant smoke may appear from the muffler. This also means that adjustments need to be continued.

The saw can only be adjusted optimally using special equipment, which is not always at hand. To do this, you should contact specialized service centers.

It is important to know how to use a tachometer correctly.

About the carburetor design

Oversaturation should not be allowed, since a large amount of fuel compared to air can also cause malfunctions or engine wear. Carburetor adjustment is needed not only before initial use, but also when any deviations in its operation are detected. Before starting to work with a chainsaw, do not forget to run it in.

The carburetor design contains a standard set of elements, but may vary slightly depending on the manufacturer. Components:

The basis. This is a special tube that is visually similar to an aerodynamic design. Air passes through it. In the transverse direction, a damper is located in the middle of the pipe. Its position can be changed. The more it is extended into the passage, the less air enters the engine.
Diffuser. This is the constricted part of the tube. With its help, the air supply speed increases precisely in the segment from which the fuel comes out.
Channels for fuel supply. The fuel mixture is contained in the float chamber, then passes into the nozzle, from which it flows into the atomizer.
Float chamber. It is a separate structural element, reminiscent of the shape of a tank. Designed to constantly maintain the optimal level of fuel fluid before entering the channel from which air enters.

What you need to have to set up and adjust a chainsaw with your own hands

Each carburetor owner must have the necessary tools to adjust this system. There are three adjustment screws that are located on the body of the device. They have their own markings:

L - screw for correcting low speeds.
H - screw for adjusting high speed.
T - regulates idle speed, in most cases it is used for experiments.

Before adjusting the carburetor, you need to prepare the device:

The engine warms up, that is, it starts about 10 minutes before repairs, and turns off when starting work (see how to start a chainsaw).
The air filter is checked and washed.
The chain is stopped by turning screw T until it stops (see chain oil).

How to properly adjust a factory saw

Carburetor adjustment is divided into two main stages. The first one is called basic. It is performed with the engine running. The second is performed when the engine is warm.

To complete the carburetor adjustment procedure successfully, You need to read the operating instructions in advance specific model to identify additional device configuration features.

First stage

The adjusting screws for the highest and lowest speeds should be moved clockwise until the highest resistance is met. When the screws reach the stop, you need to move them in the opposite direction and leave them 1.5 turns.

Main stage

Checking acceleration operation

If this does not happen or the increase in speed is too slow, you must use the screw marked L. It turns counterclockwise. Moderate movements must be observed, since the turn cannot be more than 1/8 of a full circle.

How to adjust the maximum number of revolutions

Final check at idle

Before this procedure, it is necessary to carry out a full adjustment of the carburetor components when operating at maximum speed. Next, you should check the functioning of the device in idle cold mode. When the correct adjustment parameters are achieved, you can notice the exact compliance of the carburetor design with the following criteria:

Disassembling the carburetor if necessary to check or repair components

The top cover is removed. To do this, you need to unscrew the 3 bolts holding it in a circle.
The foam rubber is also removed, since it is the upper component of the filter that conducts air.
The fuel hose is removed.
The drive thrust is output directly to it.
The cable end is disconnected.
The gasoline hose can be completely removed if you systematically pull it off the fitting.

To finally prepare the carburetor for major repairs or replacement of the smallest parts, you need to carefully disconnect it from the main system. Sometimes further disassembly is required. You should unscrew the components carefully and put the fasteners in groups, as these small parts are easily lost.

How to properly adjust a Chinese-made saw - adjustment instructions

Adjustment procedure:

Activities start at idle. Using the adjusting screws, you need to achieve a systematic increase in engine speed, so you should first let it run at low speeds. A deviation from the norm is the movement of the chain along the bus. In this case, you need to adjust the outer screws to the optimal position so that the chain remains motionless.
The transition to medium speed speed is carried out. Sometimes the engine starts to smoke. This defect can be eliminated by tightening the screw to supply a leaner fuel mixture.
In this case, the smoke will disappear, but the engine speed will increase. You need to adjust the settings until you reach a level where, when you press the throttle, the engine smoothly picks up speed, and no sudden jerks or interruptions are heard.
The device motor is being checked. The chainsaw is switched to minimum speed, and then the lever is quickly pressed. When pressed maximally, it is held for 3 seconds. If there are problems with the engine, you need to gradually loosen the screw until the optimal position is reached.
The chainsaw should work for several hours in real conditions. You need to cut wood, and then inspect all the elements involved in this event. If there are deviations, they must be corrected using adjusting devices. When all defects have been eliminated and the optimal settings have been established to supply correctly concentrated fuel, the device setup process can be considered complete.

Before purchasing, we recommend that you familiarize yourself with the rating of chainsaws for reliability and quality.
Take a look at the video:

Conclusion

In order for the chainsaw to work properly, you need to carefully carry out the work of adjusting the carburetor in exact accordance with their order. If any malfunctions occur in the operation of the device, you must completely disassemble it yourself. In most cases, replacement of any parts that have become unusable is required.

By constantly checking the quality of carburetor settings and taking timely actions to improve its operation, problems with the chainsaw will not arise.

A carburetor is an integral element of a chainsaw, the function of which is to mix the fuel mixture with air and further supply the finished fuel to the engine of the tool. Despite the high reliability of modern carburetors, they are often subject to various breakdowns, which entails a complete stop of the chainsaw engine. Let's look at the design of this important unit and methods self-elimination its malfunctions.

The design of a chainsaw carburetor is simple and accessible

As with other chainsaw components, before repairing the carburetor, you should study its design in detail. This will help determine the true breakdown and quickly fix it. The design of a chainsaw carburetor consists of the following elements:

Tube - equipped with a transverse damper that regulates the entry of air into the system;
Diffuser – located next to the fuel inlet. As the diffuser narrows, the air flow rate into the system increases;
Fuel needle - serves to distribute fuel;
Float chamber - regulates the fuel level at the point of entry into the channel.

To better understand the design of the unit, you will need a diagram of a chainsaw carburetor. It clearly demonstrates the location and method of connecting the main elements of the unit.

The operating principle of a chainsaw carburetor is quite simple. The needle sprays fuel into the float chamber, after which the fuel is mixed with air. Further ready mix gets into the engine cylinder. The more fuel supplied to the engine, the higher the engine speed.

Regardless of the manufacturer and model of the chainsaw, each modern instruments is equipped with carburetors that have an almost identical design and operate on the same principle. The main differences lie in the materials of the spare parts and their location in the carburetor structure.

Adjusting a chainsaw carburetor - when is the procedure required?

Often chainsaw owners think about why the chainsaw shoots into the carburetor, or why gasoline does not flow into the chainsaw carburetor? In both cases, the cause of the malfunction lies in a failure of the unit’s factory settings, and to eliminate the breakdown, the chainsaw’s carburetor must be adjusted. A number of other signs will help you understand that the chainsaw carburetor needs to be adjusted:

The engine does not start at all, or stalls immediately after starting - the reason for this may be a shortage of fuel coupled with an excess of air;
Increased fuel consumption - in this case, the amount of exhaust gases rapidly increases. The reason for this situation should be sought in an increase in the amount of fuel and a decrease in the amount of air;

There are also a number of mechanical reasons that lead to the need to adjust the carburetor. These include:

Strong vibration - it leads to damage to the protective cap, resulting in loss of fixation of all three adjusting screws;
Wear of the piston part of the engine - in such a situation, adjusting the carburetor will only temporarily prolong the operation of the tool. To completely eliminate the problem, you will have to completely replace the piston group;
The formation of blockages - they appear as a result of the use of low-quality gasoline, damage to the filter or scale. In such cases, it will be necessary to dismantle, disassemble and clean the carburetor.

In any of the above cases, it is better not to delay the procedure for adjusting or flushing the unit. Otherwise it will cause damage to others, no less important elements chainsaws.

How to properly adjust the carburetor on a chainsaw?

Before adjusting the carburetor on your chainsaw, you will need to learn the meaning of the three screws required for adjustment. These screws have certain markings and names:

Screw “L” is necessary to adjust low speed;
Screw “H” is required when tuning the motor to operate at high speeds;
Screw "T" is needed to adjust the idle speed.

It is worth noting that some chainsaws are equipped with only one “T” screw, so the carburetors of such models are adjusted by manipulating only this screw.

No matter how many screws there are on the chainsaw, the factory carburetor settings are the most optimal for its operation. The screws themselves are initially used to configure the chainsaw to work in certain weather conditions.

The carburetors of chainsaws with three screws should be adjusted using screws “L” and “H”. To increase the speed, they should be turned clockwise. In order to lower the speed, the screws turn against it. To adjust the carburetor, you will need a special screwdriver for adjustment - it will not slip off the screws and damage the threads on their “caps”.

The carburetor adjustment process consists of two stages: initial and main. The adjustment algorithm is as follows:

During the first stage, screws “L” and “H” must be tightened clockwise to the very end;
After this, these screws need to be turned 1.5 turns in the opposite direction;
At the second stage, you need to start the chainsaw and leave it for 10 minutes to completely warm up;
Then start turning the screw “T” until the chainsaw motor starts to run stably and the chain on the bar does not rotate.

Do not rush when adjusting the chainsaw. It must be remembered that the slower you turn the screws, the better you will feel the changes in the operation of the tool’s engine.

How to check a chainsaw carburetor?

After adjustment, you need to check the acceleration, maximum speed and engine idle. While checking the first parameter, you should sharply press the gas trigger. If the motor does not begin to gain speed, then you need to turn screw “L” counterclockwise. In this case, one turn should not exceed 1/8 of the full circle of the screw.

To measure the maximum revolutions, you will need to engage the “H” screw. To increase the maximum number of revolutions, the screw is turned clockwise. To reduce the indicator, the screw must be turned in the opposite direction. It should be remembered that the maximum speed should not exceed 15 thousand.

For a final check of the chainsaw while idling, you need to start the tool and place it on a level place. Let the engine warm up and pay attention to the following elements of the chainsaw:

The chain should not move;
Engine - when you press the gas trigger, it should confidently gain speed until the set maximum limit is reached.

An important tip is that if the carburetor is configured correctly, the sound of the chainsaw engine will closely resemble the sound of a 4-stroke engine.

The carburetor of a Chinese chainsaw is adjusted and checked in a similar manner. The only difference is that the process of setting up such tools can take much longer - on average, about an hour. In addition, it should be remembered that adjustment of Chinese chainsaws is required much more often - it often needs to be done immediately after running in a new tool.

How to remove a carburetor from a chainsaw?

Before cleaning or repairing the carburetor, this element chainsaws will need to be dismantled and disconnected from other components. To do this, you must follow a certain procedure. The dismantling algorithm looks like this:

First, remove the top cover by unscrewing the 3 bolts around its perimeter;
Remove the filter shaped like a foam pad;
Disconnect the fuel supply hose;
Remove the drive rod;
Disconnect the cable end;
Carefully remove and completely pull out the fuel supply hose.

Try to perform each action as carefully as possible. Otherwise, there will be a risk of damage to important elements of the chainsaw.

How to clean the carburetor on a chainsaw?

It is necessary to flush the carburetor of a chainsaw in cases where low-quality fuel is used to refuel the tool, or the tool is used in extreme conditions. low temperatures. In the process of work, you need to try not to damage or lose small parts node. Cleaning the carburetor is performed in the following order:

Remove the screws holding the carburetor body;
Open the lid, remove the small parts of the assembly and place them on a towel;
Carefully treat the walls of the case and all existing parts with compressed air from a can;
If carbon deposits remain on the parts, wipe them with a rag moistened with a degreaser;
Dry the body and parts;
Assemble and install the carburetor on the chainsaw.

After cleaning the carburetor with your own hands, you will notice that the chainsaw motor will work much more stable and gain speed much faster.

Owning a chainsaw makes life easier for even an amateur in many ways, and in some professions this tool is actually indispensable. However, like any relatively complex device, a chainsaw requires periodic maintenance. Due to untimely or poor quality maintenance, as well as as a result of exposure to both planned and excessive loads, problems may appear. various kinds malfunctions. For professionals, interruptions or unstable operation of the saw reduces work efficiency or can cause a ruined work day. One of the quite common malfunctions is the incorrect setting of the chainsaw carburetor, which gets lost due to unsuccessful attempts at adjustment or displacement of the adjusting screws for other reasons.

Symptoms of malfunctions and breakdowns that require carburetor adjustment.

The following signs and malfunctions indicate the need to adjust the carburetor:

the engine starts with effort and stalls almost instantly;
gasoline consumption is excessively high, the exhaust is too thick, the combustible mixture in the cylinder does not burn completely;
The factory settings of the chainsaw carburetor are lost (due to vibrations or unsuccessful attempts at adjustment);
malfunctions of the air purification system, which led to debris particles entering the fuel mixture distributing mechanism;
significant wear of the piston group - carburetor adjustment in this case acts as a temporary measure.

It is clear that if dirt gets into fuel system One setting alone will not solve the problem - it needs to be flushed. In case of wear of the piston, it is required major renovation. However, in all these cases, the carburetor is also adjusted.

Purpose, design and principle of operation of the carburetor.

A carburetor is needed to prepare the air-fuel mixture to power the engine. If the proportions in this mixture are incorrect, the operation of the motor is disrupted. If the proportion is not observed in the direction of increasing the amount of fuel, the mixture is called oversaturated, but if, on the contrary, there is little fuel, it is called lean. Both have a negative effect on engine performance.

IN different models Chainsaw carburetors differ in design, but they are similar in principle of operation. The air flow moves at high speed along the air channel. The damper that blocks the channel allows you to change the speed of the air stream. The fuel is supplied through the atomizer into the channel, where it is mixed with the incoming air, forming an air-fuel mixture. The resulting mixture enters the engine.

The pressure in the float chamber, where the fuel is located before mixing, is almost equal to atmospheric pressure. But a vacuum is created in the air channel, due to which the fuel is drawn into the air flow. The more the damper opens, the faster the air moves, and the amount of fuel also increases - the engine speed increases. This is how you can imagine the principle of operation of a carburetor in a simplified way.

For efficient, smooth operation of the tool, obtaining maximum output and at the same time economical fuel consumption, you need to adjust the carburetor of the chainsaw. Before adjusting, you need to check the fuel and air filters - they must be clean. On most chainsaws, adjustment is carried out by three screws: idle, high speed, low speed. ABOUT correct setting The carburetor is indicated by the following signs:

The chain does not move at idle.
The engine accelerates smoothly and quickly.
The sound of the running engine is smooth, similar to the sound of a four-stroke engine.

When adjusting the carburetor, you need to treat it with all possible care, because errors in the settings can lead to very serious consequences, including engine malfunction. If you are not 100% confident in your abilities, you need to contact a service center.

Adjusting the carburetor of the Husqvarna saw.

For the running-in mode, so that the parts receive sufficient lubrication, the carburetor of the Husqvarna chainsaw is adjusted so that the maximum speed is 600–700 rpm. below working. If it is not possible to set the operating maximum frequency using the tachometer, you should not change the preliminary settings with screw H. Exceed value maximum quantity revolutions are prohibited by the manufacturer. If, after completing the adjustment, the saw chain moves when the engine is idling, turn screw T counterclockwise to force it to stop completely.

For precise adjustment, the saw must be warmed up for at least 10 minutes and placed on a flat surface. The tire should be directed in the opposite direction from the person performing the adjustment. At the initial stage it is necessary to detect highest value idle speed. To do this, screw L is smoothly turned, first from left to right, then vice versa. When the maximum speed has been found experimentally, screw L should be turned counterclockwise by a value from 1/8 to a quarter of a full turn.

The idle speed is adjusted using a jet marked with the letter T. It must be turned from left to right until the chain begins to move. Then move smoothly in the opposite direction until the chain stops rotating. Screw H is considered to be installed correctly if the noise of the saw at full throttle without load remains small. If the exhaust is too smoky and the saw makes a lot of noise, the mixture is too rich. You need to turn the nozzle H clockwise until the correct sound is achieved. You can see how to properly adjust the carburetor in the video below.

Chainsaws Partner and Shtil, their adjustments.

In Shtil and Partner chainsaws, adjusting screws H and L set the proportion of air and gasoline in the mixture. When the screws are loosened, the mixture becomes richer and the speed increases. Screwing leads to a lean mixture and, accordingly, a decrease in engine speed.

Setting the carburetor of the Partner chainsaw to idle speed is carried out using screw T (Shtil marks this adjustment with the letters LA). Basic tool adjustment is done at the factory during final testing. In most cases, the carburetor is adjusted to supply a slightly richer air-fuel mixture than the optimal calculated one. The settings set by the manufacturer must be saved during the first few hours of operation, during the break-in period. After this, finer adjustments can be made, although this is not necessary; the saw will work normally at the basic settings.

For fine adjustment of the carburetor, a tachometer is required, in addition, you will need technical documentation to carry out work in strict accordance with the manufacturer's requirements. The best solution will entrust the fine tuning of fuel equipment to specialists.

If you still decide to adjust it yourself, you should start with screw L, then move on to jet H, after which you set the idle speed by rotating screw T (or LA - if it’s a Stihl saw).

By smoothly turning screw L in both directions, a position is sought at which the idle speed will be maximum. Once this point is found, you need to unscrew screw L 1/4 turn. If the chain continues to move while the engine is idling, screw T (LA) is slowly unscrewed until the chain stops.

After setting the maximum speed with screw H, the value of their frequency is checked using the tachometer. If the maximum rotation speed does not correspond to the values specified in the documentation, the adjustments are repeated. If the mixture is too rich at maximum speed, too much smoke comes from the muffler; if the mixture is lean, the saw makes a squealing sound and the engine heats up excessively. The adjustment ends with setting the idle speed - the position is considered correct if the engine runs exactly at minimum speed and the chain is stationary. The idle speed setting can be seen in the video below.

Setting up the carburetor of a Chinese chainsaw

Almost any Chinese chainsaw has the same adjustments as its branded counterparts. The same screws L, H and T are present. Sometimes there are saws in which only the idle speed can be adjusted. However, according to reviews from owners and service workers, not every chainsaw can be adjusted without problems. Even for experienced repairmen, some models can take a decent amount of time before getting an acceptable result.

The standard position for “Chinese” carburetors is the position of the screw L, at which it is loosened by one and a half turns from the fully clamped position. For screw H - one revolution from the same state. In many videos, screw L is called adjusting the quality of the mixture, and screw H is its quantity. The idle speed is adjusted in the same way as described above on a warm engine.