Chainsaw partner do-it-yourself carburetor repair

In detail: chainsaw partner do-it-yourself carburetor repair from a real master for the site my.housecope.com.

For people involved in construction or logging, as well as living in their own living quarters with an adjacent plot of land, it will be very useful to own a high-quality Swedish Partner 350 chainsaw, which is an excellent substitute for other tools for sawing wood, for example, two-handed saws or hacksaws .

Like any other units, chainsaws also require careful maintenance and periodic maintenanceOtherwise, they will quickly break down as a result of operation. At the same time, asking qualified professionals to fix your chainsaw costs money, which you may not want to spend for whatever reason, since you understand that you can fix most of the malfunctions and breakdowns yourself. To do this, you need to understand the device of the chainsaw and watch the video, where you will receive detailed instructions for repairing the Partner 350 chainsaw.

The vast majority of product failures occur due to engine problems and related systems. Usually, to repair the unit, it is necessary to disassemble it. In order to avoid mistakes during the disassembly process, read more about the design of the chainsaw in the video or instruction manual.

When your chainsaw won't start, the first thing to look at is are the spark plugs correct?, giving a spark, due to which the fuel is ignited and the force of the impulse pushes the piston, which performs useful work.

In order to assess the condition of the candle, you need to remove the wire going to it from the starter and unscrew it with a suitable key from the groove. Examine the candle: its appearance will tell you what happened to the chainsaw:

The consequence of such malfunctions is the impossibility of fuel to penetrate into the cylinder and begin to carry out useful work on the rotation of the chain, therefore chainsaw won't start. The reasons for this are as follows:

Video (click to play).

The fuel filter failed due to the fact that it is clogged.
The breather is clogged (this is the name of the hole made by the manufacturer in the gas tank and designed to allow air to enter the tank through it).
Lack of fuel in the gas tank.
The membrane in the carburetor is not intact, or there is a high probability that there is a blockage in the carburetor channels.
Carburetor adjustment not done properly.

To determine if the breather or filter is clogged with foreign objects, you will need to disconnect from the attachment points fuel hose and see if gasoline flows from it and with what pressure. If gasoline flows out slowly and weakly, then clean the breather with a thin, sharp object, such as an awl. If the problem is with the filter, then remove it from the tank where the fuel is stored and clean it and, if necessary, replace it.

Have you discovered that the cause of your problems lies in the carburetor? The good news here is that if the filter on your carburetor gets clogged, you can easily clean it yourself. In addition, you can easily adjust and adjust the carburetor of the Partner 350 chainsaw with your own hands if you strictly adhere to the recommendations from the instruction manual.

The bad news is that with other, more complex carburetor repairs, you are unlikely to do it yourself, and you will have to take your unit to the mechanics. Sometimes the manufacturer deliberately does not write in the instructions, how to tune and repair a carburetorso that people who are not versed in the design of the product do not try to fix the problem on their own if the chainsaw suddenly stops starting, and as a result, do not break the unit completely.

To the main breakdowns of this system chainsaws include:

Low pressure detected by a compression gauge in the cylinders, causing the motor to lose power and not be able to rotate the chain at the speed necessary to cut wood efficiently. The pressure at which the engine operates without failure is approximately nine atmospheres.
Violation of the tightness of the rings in the pistons, due to which hot gases from the cylinders enter the crankcase. The malfunction is eliminated by replacing the rings.
Problems with the tightness of the gaskets located in the cylinder head (cylinder head). Visually expressed in the form of emissions of gasoline combustion products through the gaps in the gasket and a pressure drop in the engine. The problem is solved by replacing the seals.

If you want to find out if there are problems in the cylinders, then the easiest way to do this is remove the muffler and assess the situation, looking through the hole left from the removed muffler, at the inside of the cylinders. In the event of a need for repair, you will, of course, need to remove the cylinder head for open access to the pistons and cylinders.

Sometimes, when you run your chainsaw to high engine speeds, you are surprised to find that the engine cannot cope with them, and your tool stalls. At the same time, smoke begins to pour out of the muffler. However, the motor runs easily at low speeds.

In this case, it is highly likely that the muffler of your unit clogged with soot and other products of incomplete combustion of fuel, so it must be cleaned. This work is done as follows: you will need to remove the silencer from the chainsaw and disassemble it; then clean its outer and inner surface from carbon deposits; in the last step, dry with a hair dryer and install on a chainsaw.

Note that it is recommended to cover the muffler opening with a plug or rag to avoid clogging the cylinders with debris.

Among the huge selection of models on the modern construction market, the Partner 350 chainsaw stands out, which is produced by a subsidiary of Husqvarna.

General view of the chainsaw Partner 350

Simple and easy to use, reliable and unpretentious, this saw has gained wide popularity among summer residents and owners of country houses. Sawing firewood, pruning trees and branches - this is not the whole list of jobs that this model can handle without problems. Despite the well-thought-out design and layout of the units, over time, the power unit, transmission elements and fuel system wear out.

Experienced fellers know that a competent and accurate determination of the nature of the breakdown is half the repair work done. Based on many years of experience in repairing the partner 350 chainsaw, specialists have developed a special method for diagnosing problems.

The main breakdowns of the chainsaw Partner 350

It is worth starting from the simplest nodes and mechanisms, ending with more complex ones.

This allows you to significantly save time and avoid unnecessary operations. Troubleshooting is recommended in the following order:

Chainsaw spark test;
Ignition coil;
Diagnostics of the fuel supply system;
Inspection of crankshaft bearings.

To diagnose the presence of a spark, it is necessary to remove the spark plug and, without removing the high-voltage cable, make several jerks with the starter. If there is a discharge, you will need to set the gap between the central and side electrodes. Its value in Partner 350 should not exceed the limits from 0.7 to 1.2 mm.

Adjusting the spark plug gap with a feeler gauge

Lack of this distance can lead to incomplete combustion of the fuel mixture and, as a result, increased fuel consumption with a limited power unit.As a result of exceeding this parameter, there is an inconstancy in the occurrence of a spark and interruptions in the operation of the internal combustion engine.

If there is no spark on the electrodes, it is necessary to replace the candle and repeat the diagnostic manipulation described above.

If a discharge is also not observed on the replaceable candle, it is necessary to check the integrity of the high-voltage wire and, if necessary, replace it.

The absence of a bright blue spark in the plug may indicate the need to inspect the ignition module and adjust the gap. For these purposes, remove the plastic protective cover from the saw and check the condition of the coil. The wires leading to it must be firmly fixed with screws and must not hang out at the junction. Moisture must not be present on the flywheel of the input shaft, as it interferes with the electromagnetic field.

Flywheel and ignition module of the Partner 350 chainsaw

In the absence of such discrepancies, it is necessary to make sure that the gap between the module and the flywheel is correctly set. Its value should be no more and no less than 0.2 mm, and therefore, if it does not match the recommended distance, you must independently adjust the ignition of the Partner 350 chainsaw.

For the most accurate adjustment, you need a regular coin-shaped or flat probe, which you can buy in specialized or automotive stores.

After checking the ignition, we proceed to the diagnosis of the fuel supply system.

An important influence on the correct operation of the saw is played by the fuel system, consisting of a gas tank, pipes and a carburetor.

Carburetor Partner 350 disassembled

If the mixture does not come out of the tank, it is necessary to inspect the built-in filter and breather (hole in the lid). If the fuel filter is clogged, it will need to be replaced. To clean the breather, you can use an ordinary sharp needle, carefully removing the remaining dirt and sawdust from the valve. If the carburetor is clogged, it will need to be dismantled and thoroughly cleaned.

It must be remembered that the partner chainsaw carburetor is a complex assembly consisting of many small parts. Therefore, when dismantling, cleaning and assembling, maximum attention is required.

The carburetor is used to mix the fuel mixture (oil and gasoline) with air. His work begins with the moment the starter of the saw jerks, which forces the membrane to pump fuel. After that, a diaphragm-controlled needle valve delivers gasoline to the main chamber, through which it enters the cylinder. By means of the throttle valve, it is possible to “enrich” or “deplete” the fuel mixture with air. When it is closed, less air will enter the cylinder at the same fuel level. In this case, the consumption will be increased, coupled with a drop in engine power. Therefore, the adjustment of the Partner 350 chainsaw plays an important role in creating the optimal ratio of moderate fuel consumption with high tool performance.

It is recommended to make self-configuration only if you have special tools and skills.

Before starting adjustment work, it is necessary to clean the main fuel assembly from dust and dirt. To do this, you can use a compressed air compressor or a carpentry brush.

To adjust the carburetor, holes are provided on the left side of the power unit, however, for the convenience of determining their position, experts recommend dismantling the protective plastic casing. First, we tighten the screws for the quantity and quality of fuel clockwise to the stop, loosening them after 1/5 ... ¼ of a turn.

Partner 350 chainsaw carburetor with tuning screws

When the cover is dismantled, you need to know that the fuel mixture quality screw is on the right and, accordingly, the gasoline amount adjustment screw is located on the left. For convenience, the carburetor body under the bolts is marked:

- "L" - fuel amount screw (adjustment at low speeds);

- "H" - mixture amount screw (setting at maximum speed);

- "T" - idle adjustment bolt.

It must be remembered that the adjustment of the carburetor of the Partner 350 chainsaw must be carried out on a warm engine. At high temperatures, the metal expands linearly, as a result of which the throughput of the channels increases.

As soon as the cylinder becomes warm, we tighten the “L” screw until the internal combustion engine gives out the maximum speed of the crankshaft. Then twist it a quarter of a turn. It is worth noting that in this position the screw for the amount of mixture supply must maintain the engine at idle. If such a setting is not enough, then boldly unscrew the “T” bolt until the engine runs stably. Using the “H” screw, we correct the operation of the Partner chainsaw at maximum speed.

An important factor in the correct operation of the engine is the bearings and seals of the crankshaft. Image - Chainsaw partner do-it-yourself carburetor repair

Crankshaft Partner 350 with bearings

To diagnose their wear, it is necessary to shake the flywheel mounted on the shaft in the vertical and horizontal plane. If there is obvious play, the rolling bearings must be replaced. If there are oily traces on the crankcase, then the oil seals will also need to be replaced. It will not be superfluous to check the play of the crankshaft Partner 350, for which we remove the cylinder and piston. With the help of hands, we shake it to the left and right, thereby imitating the natural movement.

Despite some difficulties in repairing the Partner 350 chainsaw with their own hands, the owners of these units, before handing over the tool to specialized centers, try to restore their working capacity on their own. After all, most problems can be fixed with conventional locksmith tools and with basic experience in repairing mechanical components.

Construction and repair activities often require the use of a chainsaw. Adjusting the carburetor of the partner 350 chainsaw can be done independently with certain knowledge. The need to implement this process occurs infrequently. It often appears when the engine is worn out, fuel supply errors. You can understand that adjustment is required if, during operation, the motor starts to stall for no reason, extraneous noises appear.

Malfunctions are associated with the accumulation of a large amount of oxygen or with the presence of an insufficient amount of fuel.
Interruptions in work are noted if there is an increased consumption of fuel, leading to a large emission of exhaust gases, which supersaturate the fuel mixture.
Unforeseen failure in work often appears in the presence of mechanical breakdowns. So, in the presence of strong vibrations, a similar problem may arise, the protective cap is damaged. Vibration loosens the fastened bolts.
Wear on the piston area of the motor. This problem can only be fixed by replacing the damaged element. Then you need to configure the node.
Interruptions in the work of the partner 350 carburetor may occur when low quality fuel is used. Such a problem leads to the fact that the filter is damaged. To eliminate this situation, it is necessary to disassemble, flush the working units.

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It is important to timely run-in the factory device before starting the workflow, and set it up in time.

The main components of a carburetor are:

Main part. It is a special tube designed to pass air. There is a damper with the possibility of changing the location.
Diffuser. This is the narrow area of the tube. It is necessary to accelerate the flow of air-type mass.
Fuel supply channel. Fuel is stored in the float chamber. From there it passes into the jet, and then into the atomizer.
Camera. It is shaped like a container. Maintains the fuel supply in the right amount.

To set up and repair the saw, we need tools - screws L, H, T, diagram.

Proper tuning of the partner 350 chainsaw carburetor will eliminate the occurrence of the above problems. This work begins with disassembly. Adjusting the carburetor of the Partner 350 chainsaw requires knowledge of information about the design of the working unit.

When disassembling the elements for repairing the saw carburetor, it is useful for a partner to use the following recommendations:

When shooting elements of a Husqvarna saw with your own hands, the structure must be acted as carefully as possible. You need to remove each element. It is advisable to arrange the parts in the order in which they are removed. This will help make the subsequent assembly process as fast as possible. The unit can be disassembled quickly.

The top cover is held in place with three bolts. You will need to carefully disassemble them. Under the removed cover is a foam layer. It performs the air filter option.

You will need to remove the filter rod in the saw. To do this, you must dismantle the gasoline hose.

To adjust the carburetor of the partner 350 chainsaw, you need to remove the tip that is on the cable. To do this, carefully remove the fuel hose and disconnect the carburetor. Take it off slowly.

After completing all the above steps, you can start adjusting the partner 350 chainsaw carburetor. Please note that this type of operation is considered quite laborious. You will need to set up step by step. Individual elements are small in size. It is important not to lose them during disassembly, to set them up.

↑Saw partner 350, when the carburetor is adjusted correctly, is able to function properly and reliably. At the basic stage of adjustment, it is necessary to tighten the adjusting screws to the maximum. These screws have a special designation - "L" and "H". They are wrapped slowly to the required stop. The operation is performed clockwise. Then, the screws will need to be unscrewed in the reverse order one and a half times. Image - Chainsaw partner do-it-yourself carburetor repair

Further, do-it-yourself adjustment of the partner 350 equipment carburetor involves the following list of actions:

The operation of the internal combustion engine (ICE) of a chainsaw is based on the combustion of a fuel-air-oil mixture. To mix the gasoline-oil mixture with air, and then supply it in portions to the combustion chamber, a rather complex device is installed on the engines - a carburetor. When buying a new chainsaw, the carburetor already has factory settings, but over time they go astray, and the device that controls the fuel supply needs to be adjusted again. Without knowing how the carburetor works, and without understanding the principle of operation of this module, it will be problematic to configure it correctly.

The chainsaw carburetor consists of the following main nodes:

one-piece cast body made of light aluminum alloy;
diffuser located at the entrance to the carburetor;
jets, special valves designed to regulate the supply of a combustible mixture;
atomizer;
float chamber.

Below is a diagram Walbro carburetor, which are often equipped with chainsaws. Using this diagram, you can study in more detail the internal structure of the chainsaw carburetor.

The carburetor may have 2 or 3 adjusting screws with springs. The adjusting screws are designed so that they have needles (cones) at their ends. The screws are right-hand threaded, meaning they are screwed in clockwise.

Chainsaw carburetor operation happens as follows.

After starting the engine, the air damper opens.
In the diffuser (16), where there is a constriction, the air flow is accelerated and mixed with gasoline.The latter enters through the jets (15) and (12), and the air purified by the air filter through the damper (7) located at the diffuser inlet.
The damper (8), located behind the diffuser, regulates how much of the prepared mixture enters the combustion chamber.
The volume of gasoline passing through the jets is regulated by screws (17) and (10) - these are, respectively, screws L and H on the chainsaw.
The volume of the fuel mixture in the float chamber (14) depends on the needle valve (11). The functioning of the needle valve is controlled by a diaphragm (13).
The membrane (4) controls the supply of the fuel mixture to the combustion chamber, and this depends on the number of revolutions of the internal combustion engine. Gasoline passes through the filter (6).

As already mentioned, the new chainsaw already has standard fuel settings. But for proper break-in, it is recommended to limit the maximum engine speed, and this is done using the adjusting screws located on the carburetor body. Also, after running in, it will be necessary to again fine-tune the supply of the combustible mixture.

In addition, you will have to adjust the carburetor in the following cases:

due to strong vibration, the factory settings have gone astray;
The internal combustion engine does not start well and immediately stalls;
The internal combustion engine starts, but the speed does not develop, and it stalls;
the piston group has worn out - in this case, adjusting the chainsaw carburetor is possible as a temporary measure;
the engine does not operate at idle;
increased consumption of gasoline, due to which the unit produces a lot of smoke, the muffler and spark plugs are contaminated with soot, and engine power is reduced.

You should know that the carburetor can only be correctly adjusted if:

cleaning filters (gasoline and air) are not contaminated;
jets and channels suitable for them are clean;
membranes are not damaged;
the needle valve is in good condition and the required volume of the fuel mixture enters the float chamber.

To adjust the carburetor of imported chainsaws, you must adhere to the following rules.

Before adjustment, if possible, warm up the engine at idle or minimum speed for about 10-15 minutes.

Turning the knob “L” they achieve such an operation of the engine that it gives out one and a half to two thousand revolutions per minute at idle. But you should pay attention to how the engine is gaining momentum. When you press the accelerator lever, acceleration should go quickly and evenly. If a “dip” in speed is detected, the screw should be slightly unscrewed until this phenomenon is eliminated, since it is caused by insufficient enrichment of the fuel mixture.

When the mixture supply at low speeds is adjusted, you should start tighten screw “T” until you notice the saw chain spin. After that, the screw should be unscrewed by half or a third of a turn, observing the behavior of the clutch mechanism. Normally, at idle, the saw should not rotate.

The “H” screw compensates for under or over speeds due to a change in fuel type, changes in oil concentration or ambient humidity. Also, the “upper” setting can fly off if the low speed is incorrectly adjusted with the corresponding screw.Screw “H”, without having enough experience, it is better do not regulate. If the chainsaw carburetor is adjusted by an incompetent person, there is a great danger that too lean mixture will enter the combustion chamber at high speeds, especially under load. Such operation of the engine will inevitably lead to rapid wear of its piston system and to a failure in the ignition system.You can start adjusting high speeds if the person who will perform the tuning has the knowledge and skills to adjust carburetor engines. The master tuner must have a special device at his disposal - tachometer or multimeter with oscilloscope function.Setting up the chainsaw carburetor, namely, high engine speeds, occurs according to a simple scheme.

It is necessary to tighten or unscrew the screw “H” until the engine develops about 15 thousand revolutions per minute (according to the tachometer) or the value indicated in the manual for this unit at maximum gas.

When using an oscilloscope, the spark discharge frequency should be between 230 and 250 Hz. Keep in mind that under load, the frequency can decrease by approximately 10-15%.

It can be concluded that for safety, the internal combustion engine should be set to a slightly lower speed.Chinese chainsaw carburetor should be configured in the same way as described above. On its body there are holes into which, in order to adjust the engine speed, you need to insert a flat screwdriver. Each hole is signed by any one of the three letters. As a rule, you can see the letter “T” near the upper hole, and the letters “L” and “H” near the lower ones (shown by arrows).The Chinese one has the same arrangement of screws. chainsaw carver (CARVER). The following figure shows what a carburetor from a Chinese chainsaw looks like outside the unit body.The main malfunctions of the chainsaw carburetor may be as follows.The engine revs poorly, works intermittently, power is reduced. These problems are often caused by a clogged air filter. You will need to remove the cover that covers the filter and clean it, which consists in washing with detergent.In general, timely adjustment, as well as timely repair of the chainsaw carburetor, can significantly extend the life of the entire engine piston system. Therefore, the tuning of this component of the fuel system must be treated with great attention.

Proper adjustment is possible only if the chainsaw carburetor has been studied in advance and the quality of this part has been checked. For example, for the Partner p350s tool, the carburetor manufacturer is Walbro. The quality indicator in this case is the WT-891 marking.

This information is necessary to order spare parts.

The carburetor of the Partner 371 chainsaw or any other model has a classic structure. The main elements are:

fuel pump;
main chamber with membrane;
throttle and air dampers;
screws (quality, quantity and idle speed adjustments).

In addition to these parts, the carburetor has technological channels through which the mixture of gasoline and oil moves.

The principle of operation is as follows. An impulse is applied from the crankcase to the fuel pump. With it, the work of the carburetor begins. After receiving a pulse, the fuel mixture is directed to the main chamber, entering there through a needle valve, which is controlled by a diaphragm. From the main chamber, through the technological channels, the liquid is directed to the cylinder, while the amount of liquid can be independently regulated using a throttle valve.

Additionally, the throughput of technological channels can also be adjusted. For this purpose, it is necessary to use screws of quality and quantity, which work on the principle of valves.

The Partner chainsaw is characterized by the following types of malfunctions:

engine malfunctions, such as problems with ignition, fuel supply or exhaust and piston-cylinder systems;
failure of carburetor components, such as the clutch assembly, chain brake or lubrication system.

The causes of failures can be different, but most often they are improper operation, insufficient oil or a poor-quality fuel mixture.

Correction of malfunctions of the chainsaw carburetor is possible only after this part has been removed. And for this you need to disassemble the chainsaw directly. This work will have to be done in the following sequence:

Remove all knots in strict order. First the chain brake cover and saw set, then the top cover, saw handle and starter.
After these parts are removed, it is necessary to clean the saw with a compressor with a nozzle.
After that, you need to plug the inlet window, as there is a risk of dirt and foreign objects getting inside.

You can clean the carburetor in many ways, most often they do it with air. The sequence of work is as follows:

Loosen the top cover screw.
Remove valve gasket. After that, you need to blow the mesh with compressed air. In this case, it is necessary to blow not close, but at a short distance.
No other parts of the carburetor need to be removed. To clean the surface, you can use a special liquid.
Now the carburetor needs to be assembled by attaching the parts in the reverse order.

For the efficient operation of the Partner chainsaw, other repairs may be required. Doing your own repairs is easy.

The most common problem is the lack of:

sparks in the candle (you need to either clean the gap on the candle, or change the coil or flywheel to similar parts);
fuel supply (the cause may be a clogged hose or fuel filter);
air supply (requires air filter flushing).

Setting up a chainsaw carburetor A do-it-yourself partner requires the preparation of the following tools:

tachometer (electronic crankshaft speed counter);
slotted screwdriver;
set of filters (their replacement is part of the adjustment process).

You can adjust the carburetor on a Partner 352 chainsaw or another model only if you first clean it from dirt. For this, it is best to use a compressor with an air nozzle. The adjustment itself is carried out in several stages:

The cover must be removed to access the adjustment screws. They also have access through special holes on the left side of the carburetor. It must be remembered that the left screw is the quality screw (marking H), and the right screw is the quantity screw (marking L).

After that, the screws must be completely tightened, and then loosened by ⅕ of a turn.

Then the chainsaw must be started, since the carburetor can only be adjusted when the engine is hot.

After that, the quantity adjustment screw must be turned clockwise to the maximum engine speed. Upon reaching this result, the screw must be unscrewed counterclockwise by ¼ turn. After that, the chainsaw should idle. If there are too few or too many revolutions, then use the throttle.

Now, using the quality screw, set the maximum speed. This parameter is determined by the tachometer. The maximum possible value is easy to see in the instructions. For example, for the chainsaw Partner 350, this value is 12500 rpm

If there is no tachometer, then you can determine the quality of the adjustment visually. If the tool smokes heavily during operation, then the quantity screw needs to be screwed a little. Another option is also possible. A chainsaw can work well at idle, but poorly at maximum. The situation can be corrected by tightening the quality screw, while the gas must be kept completely clamped. Image - Chainsaw partner do-it-yourself carburetor repair

Any chainsaw is equipped with a two-stroke single-cylinder carburetor engine. Early models of chainsaws were equipped with contact ignition, but now almost all manufacturers use electronic ignition, which eliminates the need to constantly clean the contacts and adjust the gap between them.

The air-fuel mixture for engine operation is mixed in the carburetor. Using a special valve, you can manually lean or enrich the fuel mixture for a specific purpose - for example, for sawing hardwood.

Both the serviceability of the engine and the performance of the chainsaw directly depend on the good technical condition of the carburetor. Let's take a closer look at how a chainsaw carburetor works.

Almost all models of chainsaws use an identical carburetor design. An exception is the carburetor of some very cheap Chinese chainsaw - some parts may not be there, and most of the components are made from very cheap materials.

Frame. It is made of aluminum for lighter construction and has a one-piece mold. A diffuser, an inlet fitting, an impulse channel, a main screw and an idle screw, a damper that regulates the air supply, and other elements are installed in the housing.
Diffuser. It is located at the inlet of the carburetor.
Jets. Special valves through which the amount of fuel is regulated.
Spray.
float chamber.

Before you adjust the carburetor on a chainsaw, you need to understand the principle by which it works.

When the engine starts, the air damper located at the bottom of the housing opens.
A vacuum is created in the air duct and the float chamber caused by the stroke of the piston, as a result of which an air stream is sucked through the diffuser.
The intensity of the suction of the air flow is regulated by the position of the air damper.
Gasoline through the inlet fitting from the gas tank enters the float chamber.
The rate of passage of gasoline from the chamber to the diffuser is regulated by jets.
The diffuser mixes gasoline with air.
The prepared fuel-air mixture enters the intake channels, from where it is directed to the working combustion chamber of the cylinder.

It should be understood that the dimensions of all holes are very small. Even the smallest contamination can block the flow of air or fuel, so filter elements are installed on the inlets. Unfortunately, they don't always get the job done. The following signs indicate malfunctions of the chainsaw carburetor:

High gas mileage and thick smoke from the exhaust;
The engine "does not pull";
floating turns;
The motor starts, but stalls immediately or after a few seconds;
The motor does not start at all.
Chainsaw shoots at the carburetor

All these malfunctions are a sign of a violation of the carburetor adjustment on the chainsaw or it is dirty. Hence the need for adjustment, cleaning or repair. How to do this - consider below.

The factory settings of the chainsaw carburetor provide optimal fuel and air intake parameters. But during operation, they can go astray due to vibration - even a ¼ turn shift in any of the screws can lead to a serious change in the parameters of the preparation of the air-fuel mixture and it is necessary to adjust the chainsaw carburetor.

The chainsaw carburetor is adjusted using three screws marked H (High), L (Low) and S. The last screw, depending on the brand and manufacturer, may have other names, such as T or LA.

H: responsible for the operation of the main jet and regulates the maximum speed.
L: adjusts the position of the idle jet and allows you to set low speed.
S/T/LA: intended to regulate the idle speed of the engine.

To know how to properly adjust the carburetor on a chainsaw, a technical passport is required - it contains information about the angles of rotation of the adjusting screws. After that, we go directly to the adjustment. By the way, here you will need a screwdriver to adjust the chainsaw carburetor or a regular flat screwdriver:

Place the chainsaw on a flat surface, preferably a table or something similar.
IMPORTANT: The chainsaw must be positioned with the bar facing in the opposite direction. The engine must be off.
Using a wrench or screwdriver, unscrew the fasteners of the housing cover and remove it to get to the carburetor.
Remove the air filter that covers the chainsaw carburetor. The manufacturer can install a shock-absorbing foam rubber insert on top of the carburetor - it must also be removed.
Now the chainsaw carburetor tuning begins. Screws L and H must be screwed in as far as they will go. Twist them slowly and carefully so as not to break.
Loosen both screws approximately 1.5 turns.
Start the engine and let it run for about 7-10 minutes so that it warms up well - it will not be possible to adjust the chainsaw carburetor on a cold engine.
After the engine has warmed up, run it at medium speed.
Slowly begin to tighten the idle screw counterclockwise. You need to twist until the motor runs smoothly. If the engine starts to stall, you need to continue adjusting the chainsaw carburetor and gradually return the screw clockwise.

After the carburetor of a Chinese-made chainsaw or any other has been adjusted, it is necessary to “drive” the motor at different speeds.

Either the engine does not start or immediately stalls, most likely, the carburetor is clogged and needs to be cleaned. How to check a chainsaw carburetor? You have to take it apart, otherwise it won't work.Before cleaning the carburetor on a chainsaw, it is still recommended to check other components: air and fuel filters, spark plug and muffler. It is possible that they are clogged - it is easier to clean the filter or replace the candle than to clean the carburetor on a chainsaw. By the way, it is the problem with candles that is the reason why the chainsaw shoots at the carburetor - too late ignition leads to the formation of an excess of air-fuel mixture, since it does not have time to burn out completely.In the event that the problem persists, you will have to remove the carburetor. It's very easy to do this: