Chainsaw Carburetor Work: How a Chainsaw Carburetor Works | My Tools – Adjusting the Chinese Chainsaw Carburetor: All Nuances, Repair

How does a chainsaw carburetor work | My tools

Many people know how the carburetor of a two-stroke engine works on tools such as chainsaws, lawn mowers and gas generators. However, this knowledge is only generalized, and when there is a need to repair or adjust the carburetor, immediately a bunch of questions arise, the answers to which you can find yourself, if you understand thoroughly what the principle of operation of the chainsaw carburetor is based on. It is in this that we have to figure out how the carburetor of chainsaws of different brands works.

Why a chainsaw carburetor is called a membrane

Before you begin to consider the principle of operation of the carburetor of a chainsaw, you need to understand why they are called membrane. Diaphragm (membrane carburetor) is an advanced model that can work in any position. This is very important, since a chainsaw, like lawn mowers, are operated in more than one position. Therefore, membrane carburetors are able to work in any position, which is their main difference from devices of an obsolete design or an old model.

If a membrane is used in the carburetor of the new sample, then in the models of the old model, which are used on a chainsaw such as Friendship, there is a float chamber. It is in the float chamber that gasoline of the corresponding volume accumulates. When the float drops down when gasoline is exhausted (the camera is empty), the needle moves with the float, which opens the fuel supply opening to the float chamber.

In this case, the normal operation of the old-style carburetor is ensured under one simple condition. it must be in the appropriate position. When moving the device to the side by 90 degrees or more, the float will move, and therefore the needle will block the holes for fuel supply. That is why the old-style chainsaws are designed only for operation in one position. The unit itself is in one position, and depending on the type of work performed (sawing wood or sawing logs), the tire position is adjusted.

Knowing how the Friendship chainsaw works, you can begin to consider the principle of operation of the carburetor of modern units in which there is no mechanism for moving the tire (changing the angle of its position).

What does a chainsaw carburetor consist of

The considered units of modern chainsaws differ in design from old-style devices. over, this difference lies not only in the design, but also in the principle of action. But first things first. To begin with, we learn the main components of the mechanism, and then we will deal with the principle of functioning of a chainsaw carburetor.

Structurally, the chainsaw carburetor can be divided into three parts:

1. Chamber of fuel leaks from the gas tank. This camera is connected not only with the gas tank through the fuel line, but also with the construction of the crank mechanism. This part consists of two fittings, a membrane for injecting fuel, two valves, a filter and a transport channel
2. The accumulation chamber of the fuel mixture and its entry to the channels of idle, medium speed and maximum speed. This chamber consists of a needle or needle valve, a membrane for opening the needle, a fuel accumulation chamber, adjusting screws, maximum speed flaps, as well as XX and medium speed channels, which are always open

How does a carburetor work on a chainsaw. we deal with the fuel supply to the device

So, the device in question on a modern chainsaw has a simple principle of operation, which is based on vacuum. Probably, when repairing a chainsaw, more than once every sawyer asked himself the question why there is no fuel pump on the unit. There is simply nowhere to install a pump on such a small unit, and the carburetor itself performs its fuel supply function. To understand how the chainsaw carburetor works, let us first consider the features of supplying fuel to the mechanism.

It is interesting! We return to our chainsaw Friendship, in which the gas tank is located above the motor. This design is made for a reason. Indeed, the design of old chainsaws also lacks a gas pump, only its role is played by the location of the gas tank above the carburetor and the engine as a whole. Fuel enters the carburetor by gravity through the fuel line, and its oversupply is excluded due to the principle of operation of the float chamber, as mentioned above.

How is the fuel supply in modern chainsaws with membrane carburetors? In modern chainsaws, the fuel is supplied to the carburetor through a special membrane, which is indicated under the number 4 in the diagram below.

In the diagram, this membrane is indicated as a dashed oval. Its movement occurs due to rarefaction of pressure. A quite relevant question arises as to where this depression comes from. Let us consider in detail why we will rely on the diagram below.

The fitting at number 1 is connected to the gas tank, which is located below the level of the carburetor. According to the law of physics, fuel will not be able to enter the carburetor according to this scheme. For this purpose, the design of the device in question has a fitting 2 (it can also be presented in the form of a hole, which depends on the model of the tool, however, the principle of operation of the carburetor of the chainsaw is identical). Through the nozzle 2, pressure enters the carburetor, the intake of which occurs through the channel from the chamber of the crankshaft (crank mechanism). The diagram shows a black line.

From the KShM chamber to the carburetor chamber through the nozzle 2, an alternating supply of air under pressure occurs, the cyclicality of which depends on the rotation speed of the crankshaft of the tool. That is why, before starting the chainsaw, you must initially make several movements without starting the starter (which sets the crankshaft in motion) in order to pump gasoline into the combustion chamber, and then start it.

When pressure is created by the membrane 4, the valve 3 opens and closes alternately. Fuel enters through the carburetor chamber and is directed to the inlet valve at number 5. Valve 5 opens depending on the pressure created, but not by the membrane, but by the fuel itself. Next, the fuel enters through the filter element at number 6, and moves already in purified form to the needle. A further diagram of the operation of the chainsaw carburetor is described in the next section.

The principle of operation of the carburetor on a two-stroke chainsaw engine

We continue to understand step by step the principle of operation of the carburetor of two-stroke chainsaw engines. Such knowledge will be useful not only for beginners, but also for those who wish to independently repair, adjust or adjust the carburetor. You need to know the principle of work in order to understand why certain defects arise in the operation of the tool.

So, the fuel passes through the filter element and reaches the needle, which is indicated by the number 11 in the diagram below.

Now we have to deal with the principle of operation of the second carburetor membrane, which is shown in the diagram under number 13. Under the membrane there is a protective plate with a hole through which air enters. The diagram below shows the movement of air.

At number 14, the diagram shows the fuel in the carburetor chamber. However, it will not get into this chamber until the needle 11 opens (it does not move down). To move the needle and apply the membrane 13, which is connected to the needle through the beam. The spring mechanism near the beam is designed to return the membrane 13 to its original position.

It is worth noting that the membrane is made of flexible material, therefore, under the influence of the rod from the beam, it bends. To open the needle, the membrane must move upward, thereby affecting the rod, and through the beam the needle will move to the lower position, which will entail the flow of fuel into the chamber.

To understand the reason for the deflection or movement of the membrane 13, due to which the needle is opened for the fuel to enter the chamber, it will be necessary to find out more about the features of the air entering the mechanism.

How does a chainsaw carburetor work. features of air intake

The principle of operation of the carburetor of the chainsaw also includes the supply of the air mixture to the device. As you understand, not clean fuel (oil with gasoline) enters the combustion chamber, but the fuel mixture. oil and gasoline from the tank and air that previously passes through the filter element.

It is interesting! The filter, which is installed on the carburetor, needs to be cleaned regularly, otherwise its clogging reduces the flow of air into the system, which often causes the unit to malfunction. Many inexperienced saw cutters immediately set to adjust the carburetor, however, it is enough to clean the filter and blow it with a compressor to eliminate the causes of uneven or unstable tool operation.

So, air passes through the filter, and enters the device through the membrane at number 7.

During cold start, air damper 7 is almost completely closed, as shown in the diagram. Through it there is a slight flow of air into the system. Air enters the diffuser 16. The number 12 indicates the channels or jets of idling and medium revolutions. These channels are interdependent, that is, the medium speed channel is transitional from idle. These channels are constantly open, so the fuel in the appropriate dosage enters the diffuser, where it mixes with air, heading towards the cylinder.

Number 15 designates the maximum speed channel, which consists of a valve with a rubber base. Through this valve, fuel is supplied in one direction to the diffuser chamber. Next, the throttle valve 8 enters the system, the movement of which depends on the pressure on the gas of the unit. When starting the valve 8 is upright, so the chainsaw only works on the fuel mixture coming from the channel XX. The amount of air is negligible, since the shutter 7 is also open by a few millimeters. When you press the trigger of the tool, the deflector is deflected by 10-15 degrees, as a result of which the fuel mixture is supplied from the medium-speed channel 12 in the diagram above.

When the sawyer starts sawing wood, the number of revolutions increases to maximum, so the damper moves up to 90 degrees from the original position. There is an increase in the amount of fuel, which helps to accelerate the combustion of the fuel mixture.

In order for the chamber 14 to be filled with a fuel mixture of gasoline with oil, which enters through the channel closed by a needle, it is necessary to create a vacuum, due to which the membrane 13 will be pulled inward, thereby acting on the rod. Vacuum in the chamber 14 is created during the pulling of the starter handle when the crankshaft of the tool moves. The piston moves up and down when the starter handle is “blinked” or “poked”, which provokes the creation of pressure inside the chamber 14. As a result, the chamber is filled with fuel, which flows through the corresponding channels into the diffuser, mixing with air, and heading into the cylinder.

After the engine of the unit is started, the piston will begin to move under the influence of the burning mixture, therefore, a vacuum in the chamber is formed constantly, which actually provokes the plate 13, acting on the needle valve, through which fuel enters the main chamber of the chainsaw carburetor.

Actually, this is the principle of operation of the carburetor of a chainsaw of a membrane type, the functioning of which does not depend on the angle of its location. Knowing the design and principle of operation of the unit, you can begin to configure, clean and adjust it.

The principle of operation of the carburetor chainsaw. the appointment of regulators

Returning to our scheme, it is worth mentioning why adjustment screws are needed.

The diagram shows that the screw on the right side 10 is designed to set idle and medium revolutions. Screw 17 on the left side adjusts the fuel supply at high speeds. Details of carburetor control are described in other material on this site.

A detailed step-by-step description of how a chainsaw carburetor works is described in detail in the video material.

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DIY chainsaw carburetor adjustment

The internal combustion engine of a chainsaw requires special attention due to the harsh operating conditions, and especially with the carburetor.

Without periodic maintenance, no motor system will last long. Today we will talk about the process of adjusting and eliminating various malfunctions.

Chainsaw carburetor device

To independently adjust the carburetor of a chainsaw, you do not need to be a professional motor technician. However, you still have to learn some aspects of the carburetor operation related to the process of preparing the fuel mixture.

The vast majority of chainsaws are equipped with Chinese-made Walbro carburetors. In their device they are simple, if not primitive. There is a one-piece housing of a passage type with a through hole. Inside the hole there is a diffuser. narrowing the passage with the fuel injection channel. There are dampers on both sides: the smaller one is the throttle, it controls the amount of fuel mixture to be fed into the cylinder. A larger damper. air, serves to limit the flow of air during a cold start.

Walbro carburetor device: 1. inlet fuel fitting; 2. pulse channel of the diaphragm pump; 3. inlet valve; 4. a membrane of the fuel pump; 5. exhaust valve; 6. filter mesh; 7. air damper; 8. throttle valve; 9. a fuel channel; 10. idle adjustment screw; 11. a needle; 12. idle jets; 13. a control membrane; 14. a fuel chamber; 15. main jet; 16. diffuser; 17. the main adjusting screw

All the magic of fuel preparation takes place in the hidden channels and chamber of the diaphragm pump. When the throttle is turned, the cross-section of the channel through which fuel is injected into the mixing chamber increases slightly and fuel enters in a larger volume. At the same time, the carburetor has two kind of valves: for feeding at low and high speeds. When changing the throttle position, the fuel flow changes proportionally between these two valves.

The need for such a device is that at idle and under load, the quality of the mixture should be different. At the same time, the channel through which the fuel is supplied to the mixer at idle does not completely overlap when the engine accelerates, and vice versa. the maximum speed channel corrodes slightly at idle.

Do I need disassembly

You can adjust the chainsaw carburetor without any disassembly at all, with rare exceptions you only have to remove the air filter cover. There is a considerable share of the contradiction: on the one hand, the chainsaw is designed for unhindered access to the adjustment mechanism, and on the other, it is recommended to access it as little as possible.

True, experienced fellers and filers always carry a flat screwdriver with a long sting and periodically adjust the carburetor. The explanation is simple: in the manufacture of a chainsaw, its carburetor undergoes a rough adjustment, designed for a specific composition of air and fuel. It is clear that the conditions at the place of work are different from the bench.

When changing the brand of gasoline or, for example, increasing air humidity, an experienced user of a chainsaw will always adjust the quality of the mixture for greater productivity and less wear on the piston. But this, we repeat, requires considerable experience working with a particular chainsaw and knowledge of the features of its behavior. In addition, the adjustment is incredibly thin. the screws tighten only 1/10. 1/20 turn.

Another reason to adjust is to repair or replace the carburetor. In any case, adjusting the quality of the mixture should be carried out only if the health of the carburetor is reliably known (no debris, gaskets are not poisoned), the air filter is clean, the spark plug, clutch and ignition system are in perfect order. Otherwise, it is likely that the malfunction will be eliminated at one point and the adjustment will become abnormally abrupt, and the engine will start to wear.

Basic adjusting screws

There are only three organs for adjusting the carburetor, these are spring-shunted screws for a flat screwdriver. Below is a pair of screws, on the left is L, on the right is H. A little higher is screw T (or S). So, here’s what they are for:

1. Screw L. this is the same valve that regulates the cross section of the fuel channel when operating at low speeds.
2. Screw H, by analogy with the previous one, is a channel flow regulator for high revolutions.
3. Screw T is a throttle control. It determines its position with the accelerator lever fully released.

The device of the first two adjusting screws is extremely simple: at their end there are needles inserted into spools of variable section (cones). The thread is right for everyone, therefore, turning the screw clockwise, you drive the needle deeper and lower the duct. When counterclockwise, the exact opposite happens.

Thus, the quality of the mixture is regulated in different operating modes. If the fuel content increases, gasoline does not have time to burn out completely and the engine develops rpm worse. With a lean mixture, rpm, on the contrary, grows, and at the same time, the engine temperature rises. It is worth noting that even when tightening the screws to the stop, the duct of both channels does not completely overlap, unless there is a blockage.

Regulation Rules

The carburetor setting chart and the recommended position of the adjusting screws are indicated in the instructions for each specific tool. When meeting a new saw, it is recommended to tighten the screws all the way, counting the number of revolutions, so that later you can return to the factory settings. The general principles of adjustment are as follows:

1. Before adjusting the engine, warm it up at idle for 10 minutes.
2. Turning the screw L it is necessary to achieve such a quality of the mixture that at idle the engine runs uniformly at 1500–2000 rpm. At the same time, acceleration (acceleration) when pressing the accelerator lever should be fast, but uniform. A failure in the set of revolutions indicates a too lean mixture, the screw must be unscrewed until this phenomenon disappears.
3. After adjusting the mixture for low revolutions, screw T is twisted until the chain starts to rotate, and then it is twisted 1/2 / 1. 1/3 turn. It is important to monitor the health of the clutch mechanism.
4. Screw H in artisanal conditions is not regulated.

The danger of self-adjusting the screw N is that too lean mixture at high speeds, and especially under load, leads to rapid piston wear and malfunctions in the ignition system. Climbing to adjust the high revs is possible only if three conditions are met:

1. Chainsaw obviously does not give the required power when sawing.
2. The person performing the adjustment has a general knowledge of the design of carburetor engines.
3. A means for measuring engine speed is available.

The last can be either a tachometer or a multimeter with a built-in oscilloscope. To connect the multimeter, you need to wrap 3-4 turns of thin copper wire around the spark plug wire.

The main objective of screw N is to compensate for excess or understatement of revolutions due to a change in fuel type, oil concentration or air composition. Also, the “upper” setting can be knocked out by insufficient accuracy of low-speed propeller adjustment. The adjustment scheme is simple. the screw is tightened or unscrewed until the saw engine at maximum gas produces 14.5-15 thousand rpm or the value specified in the operating instructions.

If you use an oscilloscope, its readings (spark discharge frequency) should be in the region of 230–250 Hz. Consider the accuracy class of measuring instruments and the fact that under load the revolutions sag by 10-15%. It is better if the engine will run at low revs than at high, albeit slightly.

Troubleshoot

As a conclusion, we describe typical malfunctions associated with improper carburetor adjustment and methods for their elimination:

1. The engine will not start or start and will stall after a few seconds. Obviously, the reason for the improper adjustment of the quality of the mixture at low speeds, it is too poor. With a working carburetor, you need to slightly enrich the mixture by unscrewing the screw L 1/2 turn, and then complete the setting with screw T.
2. The engine under load noticeably loses in power. In this case, the carburetor produces a too rich mixture at high speeds. Screw N must be tightened by 1/8 turn if the engine load is still not sufficiently supported, but progress is noticeable. tighten a little more.
3. The engine "sings" at maximum acceleration without load. The mixture at high speeds is too lean, the speed is too high.
4. Engine stalls if gas is applied after idling. Too poor or rich mixture, more precisely, can be said by the state of the candle.

Please note that carburettor settings may be lost due to strong vibration. For this reason, a well-chosen adjustment must be remembered by counting the turns and the position of each adjustment screw. If you have determined the best type of gasoline and oil ratio, save a small portion of such a mixture so that in case of malfunctions, check if the malfunctions are connected with the quality of the fuel and the wrong adjustment, or if the chainsaw is malfunctioning.

Chainsaw carburetor. device, do-it-yourself adjustment

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 tool. Despite the high reliability of modern carburetors, they are often subjected to various breakdowns, which entails a complete stop of the chainsaw engine. Let’s look at the design of this important unit and the ways to independently resolve its malfunctions.

Chainsaw carburetor device. simple and affordable

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

Video: Chainsaw Carburetor Work: How a Chainsaw Carburetor Works | My Tools. Adjusting the Chinese Chainsaw Carburetor: All Nuances, Repair

• Tube. equipped with a transverse flap that regulates the ingress of air into the system;
• Diffuser. located next to the fuel inlet. When the diffuser is narrowed, the air supply to the system increases;
• Fuel needle. serves to distribute fuel;
• Float chamber. adjusts the fuel level at the channel entry point.

For a better understanding of the design of the unit, a chainsaw carburetor circuit will be required. It clearly demonstrates the location and method of connecting the basic elements of the node.

The principle of operation of the carburetor chainsaw is quite simple. The needle sprays fuel into the float chamber, after which the fuel mixes with air. Next, the finished mixture falls into the cylinder of the motor. The more fuel is supplied to the engine, the higher the number of revolutions of the motor.

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

Chainsaw carburetor adjustment. when is a procedure required?

Often owners of chainsaws think about why a chainsaw shoots at a carburetor, or why gasoline does not flow into a carburetor of a chainsaw? In both cases, the cause of the malfunction lies in the failure of the factory settings of the unit, and to eliminate the breakdowns, it is necessary to set the carburetor of the chainsaw. To understand that the carburetor of a chainsaw needs to be adjusted, a number of other signs will help:

• The engine does not start at all, or stalls immediately after it starts up. the reason for this may be a shortage of fuel paired with an excess of air;
• Increased fuel consumption. in this case, the amount of exhaust gases increases rapidly. The reason in 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 make it necessary to adjust the carburetor. These include:

• Strong vibration. it leads to damage to the protective cap, resulting in a loss of fixation of all three adjusting screws;
• Deterioration of the piston part of the motor. in such a situation, adjusting the carburetor will only extend the tool operation for a while. To completely eliminate the malfunction, it is necessary to completely replace the piston group;
• Clogging. they result from 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 these cases, it is better not to delay the adjustment or flushing procedure of the assembly. Otherwise, this will lead to breakage of other, equally important elements of the chainsaw.

How to adjust the carburetor on a chainsaw?

Before adjusting the carburetor on a chainsaw, you need to study the value of the three screws required for tuning. These screws have certain markings and names:

• The screw “L” is necessary for adjusting low revs;
• The “H” screw is required when setting up the motor for high speed operation;
• 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 settings for the carburetor are the most optimal for its operation. The screws themselves are initially used to configure the chainsaw to work in certain weather conditions.

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

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

1. During the first stage, the screws “L” and “H” must be tightened clockwise to the very end;
2. After that, these screws must be turned 1.5 turns in the opposite direction;
3. At the second stage, you need to start the chainsaw and leave it for 10 minutes to completely warm up;
4. Then start turning the “T” screw until the chainsaw motor starts to work stably and the chain on the tire 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 engine.

How to check carburetor chainsaw?

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

To measure the maximum speed you will need to use the screw "H". In order to increase the maximum speed, the screw rotates clockwise. To reduce the rate, the screw must be turned in the opposite direction. It should be remembered that the maximum number of revolutions should not exceed 15 thousand.

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

• Chain. must not move;
• Motor. when you press the trigger of the gas, it must confidently gain momentum until it reaches the set maximum limit.

An important tip is that if the carburetor is set up correctly, then the sound of the chainsaw motor will strongly resemble the sound when the 4-stroke engine is running.

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

How to remove a carburetor from a chainsaw?

Before cleaning the carburetor or performing its repair, this element of the chainsaw will need to be removed and disconnected from other nodes. To do this, you must follow a certain procedure. The dismantling algorithm is as follows:

• First remove the top cover by unscrewing 3 bolts around its perimeter;
• Remove the filter having the form of 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 of the actions as carefully as possible. Otherwise, there is a risk of damage to important elements of the chainsaw.

How to clean the carburetor on a chainsaw?

It is necessary to flush the chainsaw carburetor in cases where low-quality fuel is used to refuel the tool or the tool is used at extremely low temperatures. In the process, you must try not to damage or lose small parts of the assembly. The carburetor is cleaned in the following order:

1. Remove the screws holding the carburetor body;
2. Open the lid, remove the small parts of the assembly and place them on a towel;
3. Thoroughly treat the walls of the housing and all available parts with compressed air from the can;
4. If carbon deposits remain on the parts, then wipe them with a cloth moistened with a degreaser;
5. Dry the case and parts;
6. 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 more speed.

Adjustment of the carburetor of the chainsaw, its device, principle of operation and fine tuning

The principle of operation of the engine used in a modern chainsaw involves the combustion of a pre-prepared fuel formation, consisting of a mixture of air, oil and gasoline.

In order for the mixture to enter the combustion chamber in a predetermined proportion, the device needs a special mechanism called a carburetor. Adjusting the carburetor of the chainsaw ensures the optimal composition of the combustible mixture and the required power transmitted from the working shaft to the cutting blade.

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Carburetor principle

Regardless of the manufacturer of a product, the essence of the work and the device of any gasoline carburetor remains the same. To obtain a high-quality mixture of air and gasoline, it must include the following mandatory units:

• built-in air tube with a slight narrowing and subsequent expansion;
• special fuel mixing and supply system;
• manually adjustable air damper.

During the operation of the device, air entering under atmospheric pressure through a special filter is fed into the narrowing zone of the carburetor, in which its flow rate is controlled by a movable damper that blocks the inlet section of the tube.

Important! At the exit of the narrowing part of the tube due to the expansion of its diameter, a vacuum zone is formed, into which fuel is automatically sucked from the fuel supply channel.

The intensity of this process is regulated by a special metering needle connected by means of a jet to the float chamber.

When is adjustment necessary?

The following characteristic signs testify to the abnormality of the operation of a manual chainsaw:

• the engine runs intermittently and stalls when the load slightly exceeds the rated value;
• with an increase in fuel supply, it very slowly picks up speed and cannot reach the maximum power indicator;
• in idle mode, the circuit does not remain stationary, but continues to rotate.

The detection of at least one of these signs is regarded by many as a deviation from the norm and forces the user to take timely measures to eliminate the problems that have arisen.

Correctly adjust the chainsaw. this means adjusting its carburetor so that all its main parts work with maximum efficiency and full return. Violation of the functioning of at least one of the nodes is a signal to the need for timely adjustment of its operating mode.

How malfunctions manifest

When determining the characteristic signs and causes of a malfunction of the carburetor device, the following should be considered.

Firstly, a decrease in engine speed and loss of power can occur due to a change in the air-gasoline ratio in the mixture (its depletion is due to a large amount of oxygen). With excess fuel, there is also a violation of the operating mode, manifested in a decrease in power, which is explained by incomplete combustion of gasoline vapors.

Note! In the second case, incomplete combustion of the fuel is observed with the simultaneous formation of a carbon layer in the cylinders and the appearance of a characteristic black exhaust (mixture is oversaturated).

All these deviations indicate either a malfunction in the air supply channel or a clogged carburetor nozzle.

Secondly, the lack of stability of idling indicates that the fine tuning of the mixture supply to the combustion chamber is violated, which can be caused by the same reasons.

If these malfunctions are detected, a complete cleaning of the carburetor will be required, including a mixture dosing device (easier. a nozzle), and subsequent adjustment.

Fine tuning

When purchasing a new chainsaw, it is usually already adjusted to the composition of the mixture recommended for use specifically for this model. To adjust (adjust) the carburetor in this case, it is not necessary to remove and disassemble it. It is possible to solve the problem by carrying out fine adjustment operations carried out by means of the three screws available on the case.

One of them with the code T is intended for dosing the fuel supply in idle mode. The second screw under the designation H ensures the operation of the chainsaw at maximum loads, and the third. L ensures its stable operation at low speeds.

Since the adjustment of the carburetor device is carried out only by ear (that is, it is mandatory when the engine is running), special attention should be paid to the safety of the check. To do this, the saw must be firmly fixed on a level base, and its cutting part is directed in the direction opposite to the inspector.

Before starting the adjustment operations, the initial position of all three screws must be marked with the help of an improvised painting composition or felt-tip pen. For the final (fine) tuning of one or another model of the chainsaw carburetor, it is more convenient to use the instructions for its operation.

Self-removal and flushing

To remove the carburetor from the chainsaw, it is necessary to unscrew the fixing bolts and disconnect all the supply pipes.

But first, you need to free the assembly from the fasteners in the place of fixation on the saw body, first cleaning their surfaces from dust and dirt. First of all, the saw is freed from the air intake, after which free access to the carburetor and the suction rod located next to it will open.

After this, the accelerator lever should be removed, for which the carburetor damper first lowers. Immediately after this, it will be possible to completely release the carburetor by removing another lever (suction). The latter is removed after raising a suitable wire to it, carefully picking it up from the left side. Completely freed from all bonds, the carburetor is thoroughly washed in gasoline and blown with compressed air.

Upon completion of removal of the device from the saw, it will be necessary to clean its grate by injection, for which you can use a thin needle of a suitable size.

Before you start disassembling the carburetor yourself, first of all, you need to prepare a flat area and spread a piece of clean matter on it. In addition, you will need such an auxiliary tool as a soft-brushed brush, a Phillips screwdriver, a socket wrench or a head with size M6.

To clean and rinse the parts removed from the chainsaw, it is necessary to prepare a little clean gasoline, poured into a container convenient for drawing on them. After disassembling the carburetor, the user will find a set of parts. All of them are laid out on the canvas in the sequence corresponding to the order of their subsequent washing.

The assembly of the carburetor of the chainsaw after cleaning and washing is carried out in the reverse order with strict observance of all the subtleties of its device. Upon completion of the assembly procedures and after the installation of the device in its place, you should again make adjustments according to the previously described methodology.

Device, setting and adjusting the carburetor chainsaw

Hand-held gasoline tools have firmly entered our household life. Now every owner of a country house or cottage has a manual gasoline saw. For a person far from technology, adjusting a chainsaw seems a very difficult task. In this article we will look at the device of a gasoline engine and show how to adjust the carburetor on a chainsaw.

The principle of operation of the internal combustion engine

The principle of operation of a gasoline engine is to burn a compressed mixture of air and gasoline in a combustion chamber.

The main elements of any internal combustion engine (in short. ICE): a cylinder in which the piston moves up and down under the pressure of the combustion products of the fuel mixture, and a crank mechanism that converts the reciprocating motion of the piston into rotational motion of the crankshaft.

The engine can be divided into four clock cycles:

• fuel mixture inlet;
• compression;
• working stroke;
• release of combustion products.

In the intake stroke, the piston moves down, creating a vacuum in the cylinder, and, like a pump, sucks in the fuel mixture.

In the compression stroke, the piston moves upward, compressing the suction mixture.

When the piston reaches a high point, the mixture is compressed as much as possible. At this moment, it is ignited by an electric spark. The compressed mixture burns out very quickly, almost instantly. Something similar to a fuel mixture explosion occurs. This explosion pushes the piston down, the engine begins to move.

During the stroke, the piston moves from the top to the bottom, pushing the crankshaft and doing useful work.

In the exhaust stroke, the piston moves upward, pushing the exhaust products of combustion into the atmosphere from the cylinder. There is an exhaust.

Then everything repeats first.

Types of gasoline ICE

Currently, the following types are most widely used:

• Push-pull;
• Four stroke;
• Carburetor;
• Injection.

The most obvious principle of the internal combustion engine is implemented in a four-stroke engine.

In this type, a full cycle of work occurs in two crankshaft turns. The first revolution is inlet and compression. The second turn is the working stroke and release. Accordingly, there are two valves. inlet and outlet. Opening and closing valves is synchronized with the position of the crankshaft. To do this, use the gas distribution system.

If you combine two cycles, we get a two-stroke engine. In it, a complete duty cycle occurs in one revolution of the shaft. In this type of engine, there is no need for valves and, accordingly, in a complex and heavy gas distribution system. The intake and exhaust valves replace the slots in the cylinder. The two-stroke engine can be made extremely simple, lightweight and at the same time quite powerful.

Each type of engine has its advantages and disadvantages. To date, all automotive engines are four-stroke. Two-stroke engines were previously installed on some old cars, but this is the heritage of automotive antiquity.

Four-stroke engines are made by motor cultivators and tillers, lawn mowers and gas generators.

Two-stroke engines are installed on mopeds, motorcycles, and in some boat outboard motors.

All manual gasoline tools are usually push-pull. True, recently chainsaws and lawn mowers with four-stroke engines have appeared on the market, but this is still exotic, and their advantages in this segment are not obvious.

In the combustion chamber of the internal combustion engine, not gasoline is burned, but a mixture of gasoline with air. To achieve high engine speeds, it is necessary that the mixture burns as quickly as possible, practically explodes. Gasoline itself burns slowly. And gasoline vapors explode from the slightest spark. That is why it is dangerous to be near puddles with spilled gasoline. Therefore, it is necessary to store gasoline in sealed containers. For the same reason, it is impossible to kindle the stove with gasoline and pour gasoline into plastic containers, in which sparks from electrostatic discharge are possible.

To prepare a mixture of gasoline with air and control the flow of this mixture into the combustion chamber, a carburetor is used.

In modern cars, the carburetor has been replaced by a more complex and advanced electronically controlled direct injection system. the injector.

But home appliance engines still use a carburetor.

Chainsaw carburetor device

The carburetor works on the principle of a spray gun. In fact, this is the spray gun.

Even a blonde knows how a spray gun works. We press on a rubber bulb and air pressure is supplied to the atomizer. The atomizer is connected by a thin tube to a bubble into which liquid is poured. The air in the atomizer carries liquid from the bubble along, and we get a mixture of liquid and air at the outlet.

Analogy carburetor and atomizer:

• Liquid is gasoline.
• The bubble is a carburetor float chamber, into which gasoline is constantly pumped from the tank.
• The tube is a jet.
• At the exit is the fuel mixture.

The amount of air supplied is regulated by a throttle. a special rotary damper. By pressing on the gas handle, we open the shutter, and when released, the return spring returns the shutter to its original position. This changes the engine speed.

Carburetor Adjustment Bodies

In order for the engine to work stably, it is necessary to maintain a certain ratio of gasoline and air in the fuel mixture. If there is little gas, the mixture will be lean and the engine will not reach the required power. If there is too much gas, then the mixture will be too enriched, which is also bad.

To adjust the ratio of air and gasoline is a jet. The jet is the very tube in the atomizer bubble. Only very thin. In addition, the cross section is regulated by a conical needle that overlaps the hole. By turning the needle inward, we reduce the section of the hole and, accordingly, the supply of gasoline to the mixture, while twisting it, we increase it.

The air-gas ratio is different for low and high revs, so most carburetors have two jets and two adjusting screws for low and high revs. The low-speed screw is usually marked with the letter L, from English Low. “low”. The high-speed propeller is indicated by the Latin letter H, from English High. “high”.

The flow of the mixture is controlled by a throttle. The more the shutter is open, the higher the speed. At idle, the shutter is almost closed. If the shutter is completely closed, the engine will stall. The opening angle of the damper at idle is controlled by a special screw, usually indicated by the Latin letter T, from the English Throttle. a throttle. Different manufacturers may have different designations, so read the instructions.

Actually, these three screws also regulate the carburetor.

Chainsaw setup steps

Here we will show you step by step how to adjust the chainsaw carburetor. As a rule, during normal operation, a full carburetor adjustment is not necessary.

Sometimes it may be necessary to adjust screw T for stable idle operation. By turning the screw clockwise, we increase the speed, while turning it counter-clockwise, we decrease.

It is necessary to achieve stable operation of the engine, but so that at idle the centrifugal clutch does not work, that is, the chain remains stationary.

If, however, full adjustment is necessary, then proceed as follows: with the engine turned off, we turn both screws L and H clockwise to the stop. Then we turn one and a half turns to the left. This is the standard position.

Then we launch the saw and check how it reacts to the addition of gas. If the reaction is sluggish. unscrew the screw L a little more, but no more than 1/8 turn.

Screw N sets the maximum engine speed. They are usually indicated in the instructions. For adjustment it is necessary to have a speed meter. a tachometer. There are methods for adjusting speed without a tachometer by ear. We do not exclude this method, but also do not recommend it. If these adjustments do not give a result, we are looking for a reason.

Reasons for unstable engine operation

Chainsaw requires clean air. The smallest speck of dust that gets into the nozzle will disrupt the carburetor. Therefore, it is necessary to clean the air filter in time. The same applies to the fuel filter.

The two-stroke chainsaw engine does not have a lubrication system. Instead, oil is added directly to gasoline. The normal proportion of oil in the fuel mixture is 2 percent. That is, the ratio of oil to gasoline is 1 to 50 by volume. Prepare the fuel mixture correctly.

Oil is poorly soluble in gasoline. Therefore, you need to thoroughly shake the mixture during cooking and before pouring it into the gas tank. Use the mixture on time, do not store it for future use. For the same reason, it is not recommended to leave the mixture for a long time in a non-working carburetor. Before leaving the saw for a long time, it is necessary to drain the remainder of the mixture from the gas tank and let the saw idle until it stops to work out the remaining fuel in the carburetor float chamber.

Check the condition of the spark plug by turning it out of the socket. The candle should be dry and clean, light brown in color. If the candle is wet and black, this may indicate an excess of oil in the mixture and whether the fuel is incompletely burned. Rinse the candle with clean gasoline and dry thoroughly. In no case do not light a candle, as is sometimes advised. If the porcelain insulator cracked, replace the spark plug.

Often the cause of poor performance is clogged muffler. And not the silencer itself, but the spark-extinguishing grid, which is installed at its outlet to protect against sparks. Due to soot, small mesh cells become clogged and the saw loses power. Rinse the net at least once a season. Some wizards recommend completely removing this grid. But since the net is a protective measure against accidental ignition of flammable objects, such as dry grass, that are near the saw, we do not support this recommendation.

Sometimes the cause of unstable operation is the suction of extraneous air. Check carburetor and muffler mounting. They are fastened with long bolts through gaskets.

If all else fails, more serious intervention is required.

It is believed that the complete disassembly, repair and assembly of the carburetor is a difficult task and you need to contact the service. However, the service is not always nearby, and it is quite possible to repair the carburetor yourself. But that’s another topic.

The principle of operation of the carburetor chainsaw | 101 Chainsaw

The chainsaw carburetor is pretty simple. The carburetor’s job is to accurately measure extremely small amounts of fuel and mix it with the air entering the engine to make it work properly.

If there is not enough fuel, or it mixes poorly with air, the engine starts to intermittently or does not work at all. For this reason, it can also be damaged (in a two-stroke engine, the fuel also supplies engine lubrication). If too much fuel is mixed with air, the engine runs excessively hard, with a lot of smoke, intermittently. The carburetor is an important component responsible for the correct mixture and condition of the engine.

Features carburetors

A chainsaw carburetor is simple because most of the work is done in several situations.

1. It should work when starting the engine cold.
2. It should work when the engine is idling.
3. It should work when the air damper is open.

The chain saw operators are not interested in the specifics of the carburetor in the intermediate stages. Many gradations are important in a car, and that is why a car’s carburetor is much more complicated.

Carburetor components and principle of operation

The carburetor is essentially a pipe. The principle of operation of the carburetor chainsaw has features.

On the tube, called the throttle plate, there is an adjustable part that controls how much air can pass through the tube. You can see this round brass plate when disassembling the carburetor. In some part, the tube narrows. This part is called Venturi, it is responsible for the vacuum.

There is a hole in this part of the carburetor that allows the vacuum to trap the fuel.

The carburetor will work correctly at a normal pace with full throttle. Then the plate will be located parallel to the tube, which will allow enough air to get into the carburetor.

The airflow will act on the venturi’s vacuum, and it draws in a certain amount of fuel. When analyzing a chainsaw, you can see several screws in the right corner of the carburetor, on top. One of the screws will control how much fuel flows into the venturi.

When the chainsaw starts to idle, the shutter will be half closed. The movement of air through the venturi does not create enough vacuum. But there is a lot of vacuum in the back of the throttle plate (the damper restricts air movement).

Owners of Stihl 250 chainsaws are invited to our article. Adjusting the Stihl 250 carburetor.

When the engine is cold and the operator tries to start it with the cord, the engine will start to operate at extremely low speed. To start the engine requires a fuel-air mixture. The throttle plate closes the venturi, which means that the vacuum in the engine draws in a lot of fuel. This usually allows the engine to operate quickly, but run slowly. If the operator then opens the throttle, the engine will start to run normally.

How to remove the carburetor?

If the operator has completed all the checks, but there are still problems with his chainsaw, it’s time to start dealing with them seriously. With sparks, fuel, air compression, the problem with poor engine performance, most likely, is the problem with the carburetor. Here’s how to take it off.

1. Remove the access cover to open the air filter. Remove the filter. The chainsaw carburetor adjustment key will not come in handy at this point.
2. Disconnect the switch wire from the throttle lever and snap the right side of the lever out of the socket. This is necessary to remove the throttle.
3. Pull out the lever. Professionals recommend pulling out the accelerator trigger and using a screwdriver to get the lever.
4. Remove the 2 8 mm bolts holding the carburetor.
5. Remove the fuel pipe by carefully pulling it out.
6. Carefully adjust the entire unit while removing the throttle lever.
7. Connect the fuel supply pipe to prevent fuel leakage.

Inspect the fuel pipe. A common problem is often a cracked fuel pipe. This will cause a fuel supply problem, which is an important factor for carburetor operation. Removing the fuel pipe is quite simple. As before, you will need to remove the fuel filter. Then pull out the fuel pipe, dry it, bend it in several different directions, trying to see signs of wear. Replace handset if there is any problem.

Carburetor cleaning

Stihl chainsaw carburetor operation can be unstable, as is the case with any other chainsaw, if the problem is a clogged carburetor. The operator has 2 options. You can purchase a recovery kit on the Internet, clean the carburetor well, return it together and hope that the problem is fixed.

You can easily purchase and install a new carburetor. Chinese carburetors are cheaper. Most push-pull carburetors are the same, so sometimes buying an affordable option can be a good solution. But for expensive chainsaw models, you should choose the original carburetors for replacement.

Very often the carburetor becomes the reason why gasoline does not enter the chainsaw. The link is our article with a solution to the problem.

There are basically 2 screws and 1 screw on the side of the fuel pump on the flap side. Take them off. Follow the cleaning instructions. When everything is clean, reassemble the saw in the reverse order. It should work fine if you followed all the instructions. If not, it could be a compression problem that needs to be checked with a compression gauge. Remember to adjust the idle screw by turning it clockwise until the chain stops turning during idle.

If there is a need, then using a special key, the carburetor is adjusted. As a rule, factory settings are considered optimal, but they often go astray after prolonged use of a chainsaw.

Recommended to see

Chainsaw carburetor. device, adjustment, repair methods

Each modern chainsaw, regardless of its purpose and design features, is equipped with a fuel system. It is based on a carburetor, the main function of which is to mix the fuel mixture with pre-cleaned air. Any malfunction of the carburetor leads to loss of power and other problems with the gasoline powered garden tool. You can solve them yourself. for this you need to study the design of the fuel unit, the features of its adjustment and methods of self-repair.

Chainsaw carburetor device

The carburetor of any modern chainsaw is an integral part of the engine, which continuously regulates the amount of air required for constant mixing with fuel, and feeds the finished mixture into the engine cylinder.

In most modern chainsaws, built-in carburetors initially have a similar device and almost the same principle of operation. Certain differences are only in the fuel assemblies of Chinese models.

The main elements of carburetors of all chainsaws include:

• float chamber. a small compartment, the main task of which is to maintain the optimal amount of refueling fuel;
• atomizer. an important mechanism that is initially responsible for injecting fuel into the intake air stream;
• diffuser. is located next to the regular inlet through which air enters the engine compartment of the chainsaw. The main function of the diffuser is to forcefully accelerate the absorption of air masses;
• tube. required to supply air in small volumes. in portions, the sizes of which depend on the needs of the fuel system.

The principle of operation of the carburetor chainsaw is also quite simple. When the chainsaw is started, the throttle of the engine is triggered, which in the open state passes air through the factory rubber tube. With the gradual opening of the standard shutter and the tube connected to it, a float is activated, located in the chamber with refueling fuel. Continuously passing through a standard diffuser, the air is intensively mixed with fuel. After that, the used finished air-fuel mixture is sprayed through the factory inlet into the working cylinder of a standard engine.

During spraying of fuel, the pressure inside the chainsaw of the chainsaw is almost identical to atmospheric. At the same time, the pressure in the factory tube with air is rarefied. Due to the difference in these indicators, air is continuously absorbed by the tube. With an increase in engine speed, he needs more fuel. Accordingly, the tube should suck in more air. Thus, it is the carburetor that largely determines the ability of the engine to intensively gain the speed required for sawing large wood.

How to properly adjust the carburetor on a chainsaw?

In order to independently adjust the carburetor of the chainsaw to bring the desired result, you need to carry out preparatory work. First of all, the operator must make sure that the engine is working. To do this, you must remove the top cover of the protective plastic housing and carefully inspect the engine’s CPG for burrs, cracks and other defects. If they are formed, then the surface of the node will need to be sanded. It is important not to damage the protective chrome or nickel coating on the cylinder.

Next, you need to inspect the spark plug. If a thick layer of dried carbon deposits forms on it, the part will need to be unscrewed and thoroughly cleaned. To do this, you need to heat the candle and gently scrape off the remains of dried oil from its tip.

In the end, you will need to inspect the details of the entire fuel system of the chainsaw. Blockage in the tubes, accumulated debris in the fuel and air filters, unstable operation of the diffuser. all this leads to the loss of the necessary speed by the engine. As a result, the operator does not receive accurate information about the operation of the motor and cannot establish the correct settings. To prevent this, rinse the parts of the carburetor, filter and tube. After they are completely dry, they can be installed in their original place.

Chainsaw Carb Adjustment do it yourself

For self-tuning of the standard carburetor, the owner of the chainsaw will need a Phillips or flat head screwdriver, as well as a manual tachometer.

To adjust the carburetor of the chainsaw, spring-loaded adjusting screws are provided in the base unit of its carburetor.

Depending on the brand manufacturer of the chain saw, the marking of its adjusting screws may vary. Nevertheless, in order to initially correctly configure the carburetor on a chainsaw, you can always act on the same algorithm:

1. First, the operator should find in the saw instruction manual the exact angles of gradual rotation of the spring-loaded adjusting screws. Immediately after that, on the used saw with the engine turned off, they must be turned according to the instructions in the manual. If this is not done, the operator risks breaking the tool motor;
2. Further, the chainsaw used in the household will need to be fixedly mounted on a flat, stable surface. In this case, the tire and the factory chain should be initially directed away from the operator;
3. Then you need to start the engine ICE saws and give him at least 10 minutes to warm up;
4. After that, you need to find the correct position of the screw L. For this, the operator must slowly turn it in the direction and counterclockwise until the motor starts to work quietly and without failures;
5. If, as a result of this, the chain starts to rotate, then it is necessary to find the position of the screw T at which the chain stops in place:
6. Further, a tachometer will need to be connected to the engine cylinder. Then you need to start turning the screw H. Once the indicators on the tachometer match the instructions in the saw instructions, the screw can be released.

How to wash a chainsaw carburetor?

You need to think about cleaning the fuel assembly of a gasoline-powered tool in such cases:

• at difficult start of the engine;
• during unstable operation of the internal combustion engine for a short idle;
• in case of dips when you gently press the standard trigger of gas;
• with a significant increase in the cost of refueling.

Most often, liquids that are found in almost every garage are used to flush the built-in carburetor of the chainsaw:

• kerosene;
• diesel fuel;
• clean gasoline;
• solvent.

Modern gardeners using powerful professional saws use more efficient and gentle means:

• Mannol Vergaser Reiniger is a commercially available aerosol cleaner. It quickly and easily breaks down even the oldest formations of resins, carbon deposits, oily deposits and other types of pollution;
• Hi-Gear. This cleaner is distinguished by its high dissolution properties. He is able to remove old dried spots, an oily crust and the first signs of rust without harming the details of the fuel system;
• Jet 100 Ultra is a high-tech spray designed to quickly clean the chainsaw carburetor. It shows a high dissolution rate of the oldest oily stains.

Cleaning the carburetor on a chainsaw is performed in the following sequence:

1. First, you need to clean the outside of the saw engine, as well as to dismantle and thoroughly rinse the housing of the factory air filter;
2. Next, you can proceed to disassembling the gas tool. To do this, remove the filter housing, and also unscrew the fasteners holding the carburetor together with the engine;
3. Then you will need to carefully disconnect the thrust and gas cables from the carburetor. The springs available in the design must be removed so as not to stretch them;
4. After this, carefully remove the fuel hoses from the factory fittings of the fuel assembly;
5. To clean the carburetor on a chainsaw, you need to remove it from the original mounting studs. It is important to maintain the integrity of the gasket installed between the engine cylinder and the fuel assembly;
6. The next step is to clean the outer walls of the carburetor. To do this, they can be treated with a liquid cleaner or gasoline. At the same time, you need to try so that dust and debris do not get inside the engine assembly or cylinder;
7. Next, you need to unscrew the screws that secure the carburetor diaphragm, remove its cover and rinse the internal cavity with an aerosol cleaner;
8. After this, it is necessary to dismantle the fuel filter of preliminary fine cleaning, and also disassemble that part of the unit to which the fuel is supplied. All internal carburetor parts must be thoroughly flushed with an aerosol cleaner. If the first cleaning has failed, then rinse should be repeated.

Gasoline does not enter the chainsaw carburetor – repair methods

Most often, the standard cause of this common breakdown is the formation of a blockage in the fuel foam filter or tubes, which are responsible for the stable supply of fuel to the factory metal engine cylinder. Every third Chinese gasoline tool regularly suffers from these blockages. This is due to the low quality of the built-in filters and tubes, which are equipped with inexpensive Chinese chainsaws.

Fault repair is reduced to removing and flushing contaminated parts.

To do this, you need:

1. Remove the cover of the plastic saw body;
2. Clean the space underneath and proceed with dismantling the hoses and filters. The tubes are attached to the outlet fittings using clamps. To disconnect the hoses without damaging them, loosen and remove the clamps. After this, the tubes will need to be blown with compressed air and rinsed with clean gasoline;
3. To dismantle the filter, you must first remove it from the factory housing. After this, the element will need to be placed in a container with clean gasoline. After a day, the filter can be removed and give it time to dry;
4. After washing, all parts must be carefully installed and secured in a regular place in the carburetor.

This cleaning scheme will help to thoroughly flush the most vulnerable parts of the fuel system without having to disassemble the entire carburetor.

Why a chainsaw shoots at a carburetor?

The main cause of this malfunction is the incorrectly set distance between the ignition elements of the gas tool. Because of this, the fuel that falls into the internal cylinder of the internal combustion engine does not have time to completely burn in it. The result is a sound similar to an explosion. To effectively solve the problem, you need to set the ignition of the gas tool, following the instructions in the user manual.