Chainsaw partner do-it-yourself carburetor repair

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

For people engaged 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 quality Swedish chainsaw "Partner 350", which is an excellent substitute for other tools for cutting 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 exploitation. At the same time, contacting qualified specialists with a request to fix a chainsaw costs money, which you may not want to spend for any reason, because you understand that you can fix most of the faults and breakdowns yourself. To do this, you need to understand the structure of the chainsaw and watch a video where you will receive detailed instructions for repairing the Partner 350 chainsaw.

The vast majority of product malfunctions occur due to engine problems and related systems. Usually, to repair the unit, it should be disassembled. In order not to make a mistake during the disassembly process, read more about the design of the chainsaw in the video or operating instructions.

When your chainsaw won't start, you should first see if are the candles in good working order, giving a spark, due to which the fuel ignites and by force of an impulse pushes the piston, which does 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 inability of the fuel to penetrate into the cylinder and begin to carry out useful work on the rotation of the chain, therefore the chainsaw will not start... The reasons for this are as follows:

Video (click to play).

The fuel filter is out of order because it is clogged.
The breather is clogged (this is the name of the hole made by the manufacturer in the gas tank and designed for air to enter the tank through it).
Lack of fuel in the gas tank.
The diaphragm in the carburetor is not complete, or there is a high probability of blockage in the carburetor passages.
Carburettor adjustment not correct.

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

Have you found out that the carburetor is the root of your problem? The good news here is that if your carburetor filter gets clogged, you can easily clean it yourself. In addition, you can easily do the adjustment and tuning of 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 cope with your own hands, 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 do not understand the device of the product do not try to fix the malfunction on their own if the chainsaw suddenly stops starting and, as a result, does not completely break the unit.

To the main breakdowns of this system chainsaws include:

Low pressure detected by the cylinder compression gauge, which causes the motor to lose power and cannot rotate the chain at the speed necessary to cut wood efficiently. The pressure at which the engine runs smoothly is approximately nine atmospheres.
Loss of 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 slots in the gasket and the pressure drop in the engine. The problem is solved by replacing the gaskets.

If you want to know if there are problems in the cylinders, then the easiest way to do it is remove the muffler and assess the situation, looking through the hole left over from the removed muffler at the insides of the cylinders. In the event of the need for repairs, of course, you will need to remove the cylinder head for open access to the pistons and cylinders.

Sometimes, having accelerated your chainsaw to high engine rpm, 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 revs.

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

Please 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 Partner 350 chainsaw

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 wear of the power unit, transmission elements and the fuel system occurs.

Experienced fellers know that a competent and accurate determination of the nature of a breakdown is half of 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.

Major chainsaw breakdowns Partner 350

It should start 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 check;
Ignition coil;
Diagnostics of the fuel supply system;
Inspection of the crankshaft bearings.

To diagnose the presence of a spark, it is necessary to remove the candle 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 protrude beyond 0.7 to 1.2 mm.

Adjusting the spark plug gap with a feeler gauge

Failure to reach this distance can lead to incomplete combustion of the fuel mixture and, as a consequence, increased fuel consumption with limited power of the unit.As a result of exceeding this parameter, there is an inconsistency 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 spark plug and repeat the diagnostic manipulation described above.

If no discharge is observed on the replacement spark plug, 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, we 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; they must not dangle at the connection point. Moisture must not be present on the flywheel of the drive shaft as it interferes with the generation of an electromagnetic field.

Flywheel and ignition module of the Partner 350 chainsaw

In the absence of such inconsistencies, you must make sure that the clearance between the module and the flywheel is correct. Its value should be no more and no less than 0.2 mm, and therefore, if it does not coincide with the recommended distance, it is necessary to 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, 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, which consists of a gas tank, pipes and a carburetor.

Carburetor Partner 350 disassembled

If the mixture does not flow from the tank, it is necessary to inspect the built-in filter and breather (hole in the lid). If the fuel filter becomes clogged, it will need to be replaced. To clean the breather, you can use an ordinary sharp needle, carefully removing the remnants of dirt and sawdust from the valve. If the carburetor becomes 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. Its work begins with the jerk of the saw starter, which forces the membrane to pump fuel. After that, a diaphragm-controlled needle valve supplies gasoline to the main chamber, through which it enters the cylinder. The throttle valve can be used to "enrich" or "lean" the fuel mixture with air. When it is closed, less air will flow into the cylinder at the same fuel level. In this case, consumption will increase, coupled with a decrease in engine power. Therefore, the adjustment of the Partner 350 chainsaw plays an important role in creating the optimal balance of moderate fuel consumption with high tool performance.

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

Before starting adjustment work, it is necessary to clean the main fuel unit from dust and dirt. To do this, you can use a compressor with compressed air or a broom 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, turn the screws of the fuel quantity and quality fully clockwise, loosening them after 1/5… ¼ turn.

Partner 350 chainsaw carburetor with adjustment screws

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

- "L" - screw for the amount of fuel (adjustment at low speed);

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

- "T" - idle speed 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, turn the screw "L" until the internal combustion engine produces the maximum crankshaft speed. Then we twist it a quarter of a turn. It is worth noting that in this position, the screw for the amount of supply of the mixture should support the operation of the motor at idle. If such a setting is not enough, then boldly unscrew the “T” bolt until the engine runs stable. Using the screw "H" we correct the work of the Partner chainsaw at maximum speed.

An important factor in the correct operation of the engine is played by the bearings and oil 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 stagger the flywheel mounted on the shaft in the vertical and horizontal plane. If there is a clear 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 Partner 350 crankshaft, for which we remove the cylinder and piston. With the help of our hands, we swing it to the left and right, thereby imitating the natural movement.

Despite some difficulties in repairing a 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 eliminated with ordinary locksmith tools and with basic experience in the repair of mechanical components.

Construction and renovation activities often require the use of a chainsaw. The partner 350 chainsaw carburetor can be adjusted independently with certain knowledge. The need to implement this process rarely arises. It often appears when the engine is worn out, errors in the flow of fuel. It is possible to 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 the presence of insufficient fuel.
Interruptions in operation are noted if there is an increased fuel consumption, leading to a large emission of exhaust gases, which oversaturated the fuel mixture.
An unexpected malfunction often occurs when there are 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 be eliminated only by replacing the damaged element. Then you need to configure the node.
Interruptions in the operation of the partner 350 carburetor may occur when using low quality fuel. This problem causes the filter to be damaged. To eliminate this situation, it is necessary to disassemble, flush the working units.

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It is important to run the factory device in a timely manner and set it up in time before starting the working process.

The main components of a carburetor are:

Main part. It is a special tube designed to allow air to pass through. There is a damper with the ability to change its location.
Diffuser. This is the narrow area of the tube. It is necessary to speed up the flow of an air-type mass.
Fuel supply channel. The fuel is stored in a float chamber. From there, it goes into the nozzle and then into the atomizer.
Camera. It is similar in shape to a container. Maintains the required amount of fuel.

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

Competent 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 the information on the design of the working unit.

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

When shooting elements of a Husqvarna saw with your own hands, you must act as carefully as possible. You need to remove each element. It is advisable to lay out the parts in the sequence in which they are removed. This will help make the reassembly 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. There is a foam layer under the removed cover. It performs the air filter option.

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

To adjust the carburetor of the chainsaw partner 350, 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 carburetor of the partner 350 chainsaw. Please note that this type of operation is considered quite time consuming. You will need to configure it in stages. The individual elements are small in size. It is important not to lose them during disassembly, to set them up.

↑Saw partner 350, when adjusting the carburetor 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 up to the required stop. The operation is performed in a clockwise direction. 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, adjusting the carburetor of the equipment partner 350 with his own hands implies the following list of actions:

The functioning 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 feed it in portions into 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 get lost, and the device that controls the fuel supply needs to be adjusted again. Not knowing how the carburetor works, and not understanding the principle of operation of this module, it will be problematic to correctly configure it.

The chainsaw carburetor consists of the following main nodes:

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

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

The carburetor can have 2 or 3 adjusting screws with springs... The adjusting screws are designed with needles (cones) at their ends. The screws have a right-hand thread, that is, they are screwed in a clockwise direction.

Chainsaw carburetor operation happens as follows.

After starting the internal combustion engine, the air damper opens.
In the diffuser (16), where there is a constriction, the air flow is accelerated and mixed with the gasoline. The latter enters through the nozzles (15) and (12), and the air purified by the air filter through the damper (7) located at the diffuser inlet.
A 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 needle valve (11) determines the volume of the fuel mixture in the float chamber (14). 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 is cleaned through a 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 make a more accurate adjustment of 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 are lost;
The internal combustion engine does not start well and immediately stalls;
The internal combustion engine starts up, but the speed does not develop, and it stalls;
the piston group has worn out - in this case, adjusting the carburetor of the chainsaw is possible as a temporary measure;
the engine does not function at idle;
increased gasoline consumption, due to which the unit emits a lot of smoke, the muffler and spark plugs become dirty with carbon deposits, and the engine power decreases.

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

cleaning filters (gasoline and air) are not contaminated;
the jets and the channels that fit them are clean;
membranes are not damaged;
the needle valve is serviceable 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, you should warm up the engine at idle or minimum speed for about 10-15 minutes.

By turning the “L” knob they achieve such an engine operation so that it idling one and a half to two thousand revolutions per minute. But you should pay attention to how the engine picks up speed. When pressing the throttle lever, acceleration should go quickly and evenly. If a "dip" of revolutions 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 turning. After that, the screw should be unscrewed by half or a third of a turn, observing the behavior of the clutch mechanism. Normally, the saw should not rotate at idle speed.

The screw “H” compensates for the underestimated or overestimated speed due to the change of the type of fuel, changes in the concentration of oil or the humidity of the ambient air. Also, the “upper” setting can fail if the low speed is incorrectly adjusted with the corresponding screw.Screw “H”, not having enough experience, is better do not regulate... If the tuning of the carburetor of the chainsaw is carried out by an incompetent person, there is a great danger that a too lean mixture will enter the combustion chamber at high speeds, especially under load. Such engine operation will inevitably lead to rapid wear of its piston system and to a failure in the ignition system.It is possible to start adjusting high revs if the person who will perform the tuning has the knowledge and skills in adjusting carburetor engines. The master-tuner must have a special device at his disposal - tachometer or multimeter with oscilloscope function.Setting up the carburetor of a chainsaw, namely, high engine speed, follows a simple scheme.

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

When using an oscilloscope, the spark discharge frequency should be between 230 and 250 Hz. It should be borne 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 tuned to slightly lower rpm.Chinese Chainsaw Carburetor should be configured in the same way as described above. There are holes on its body, into which, in order to adjust the engine speed, you need to insert a flat screwdriver. Each hole is labeled with 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 Chinese chainsaw carburetor looks like outside the body of the unit.The main malfunctions of the chainsaw carburetor may be as follows.The engine picks up speed poorly, runs intermittently, power decreases... 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 piston system of the engine. Therefore, the tuning of this component of the fuel system must be treated with great care.

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

Knowing this information is essential to ordering 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 adjustments).

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

The principle of operation is as follows. A pulse is sent from the crankcase to the fuel pump. The work of the carburetor begins with it. After receiving a pulse, the fuel mixture is directed into 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 into the cylinder, while the amount of liquid can be independently adjusted using the throttle valve.

Additionally, it is possible to regulate the throughput of the technological channels. For this purpose it is necessary to use screws of quality and quantity, which work on the principle of gate valves.

The following types of malfunctions are typical for the Partner chainsaw:

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

The causes of failures can be different, but most often it is improper operation, insufficient oil or 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 components in strict order. First the chain brake cover and the saw head, then the top cover, the saw handle and the starter.
After these parts have been removed, it is necessary to clean the saw using a compressor with an accessory.
After that, you need to plug the inlet window, since there is a risk of dirt and foreign objects getting inside.

The carburetor can be cleaned in different ways, most often with air. The sequence of work is as follows:

Remove the upper bolt of the part cover.
Remove the 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 carburetor parts need to be removed. A special liquid can be used to clean the surface.
Now the carburetor needs to be assembled, fastening the parts in the reverse order.

For efficient operation of the Partner chainsaw, other repair work may be required. It is not difficult to carry out repairs with your own hands.

The most common problem is the lack of:

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

Setting up a chainsaw carburetor A partner with your own hands requires the preparation of the following tools:

tachometer (electronic counter of the crankshaft speed);
slotted screwdriver;
a set of filters (replacing them is part of the adjustment process).

It is possible to adjust the carburetor on a Partner 352 chainsaw or another model only if you first clean it from dirt. The best way to do this is to use an air-cushion compressor. The adjustment itself is performed in several stages:

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

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

Then the chainsaw needs to be started, since the carburetor can only be adjusted with a hot engine.

After that, the amount adjusting screw must be tightened clockwise to the maximum engine speed. Upon achieving this result, the screw must be unscrewed counterclockwise by ¼ turn. After that, the chainsaw should idle. If the revolutions are too low or too many, then the throttle valve is used.

Now, using the quality screw, the maximum speed is set. This parameter is determined by a tachometer. The maximum possible value is easy to see in the instructions. For example, for the Partner 350 chainsaw, this value is 12,500 rpm

If there is no tachometer, then the quality of the adjustment can be determined visually. If the tool emits a lot during operation, then the amount screw must be slightly tightened. 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, so that you do not need to constantly clean the contacts and adjust the gap between them.

The air-fuel mixture is mixed in the carburetor for engine operation. With the help of a special flap, you can manually deplete or enrich the fuel mixture for a specific purpose - for example, for cutting 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 the chainsaw carburetor works.

Almost all chainsaw models use an identical carburetor design. As an exception, the carburetor of some very cheap Chinese chainsaw can be called - there may not be some parts there, and most of the units are made from very cheap materials.

Frame. Made of aluminum for lightweight construction, it has a one-piece shape. The housing contains a diffuser, an inlet connection, an impulse channel, a main screw and an idle screw, a damper that regulates the air supply, and other elements.
Diffuser. Located at the carburetor inlet.
Jets. Special valves by means of which the amount of fuel is regulated.
Spray.
Float chamber.

Before adjusting 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 generated in the air duct and in the float chamber due to the piston stroke, as a result of which an air stream is drawn in through the diffuser.
The suction rate of the air flow is adjusted by the position of the air flap.
Gasoline through the inlet fitting from the gas tank enters the float chamber.
The speed of passage of gasoline from the chamber to the diffuser is regulated by means of jets.
The diffuser mixes gasoline with air.
The prepared air-fuel 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 the holes are very small. Even the smallest contamination can block the flow of air or fuel, which is why filter elements are installed at the inlets. Unfortunately, they do not always cope with the task at hand. Chainsaw carburetor malfunctions are indicated by the following symptoms:

High gas mileage and thick exhaust smoke;
The engine does not pull;
Floating revolutions;
The motor starts, but stalls immediately or after a few seconds;
The motor does not start at all.
The chainsaw shoots 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 - we will consider below.

Chainsaw carburetor factory settings provide optimal parameters for fuel and air intake. But in the process of work, they can go astray due to vibration - a shift of even ¼ of a turn for 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 carburetor of the chainsaw.

The carburetor of the chainsaw 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, for example T or LA.

H: is 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 the low speed.
S / T / LA: intended to adjust the idle speed of the engine.

To know how to properly adjust the carburetor on a chainsaw, a technical data sheet 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 need a screwdriver to adjust the carburetor of the chainsaw or an ordinary flat screwdriver:

Place the chainsaw on a flat surface, preferably a table or something similar.
IMPORTANT: The chainsaw must be positioned so that the tire points in the opposite direction. The engine must be turned off.
Use a wrench or screwdriver to unscrew the housing cover fasteners and remove it to access the carburetor.
Remove the air filter that covers the chainsaw carburetor. The manufacturer can install a foam rubber insert on top of the carburetor - it must also be removed.
Chainsaw carburetor tuning now begins. Screws L and H must be tightened up to the stop. Tighten 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 work to adjust the carburetor of the chainsaw on a cold engine.
After the engine has warmed up, set it to run at medium speed.
Slowly begin counterclockwise to tighten the idle screw. 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 cleaning. How to check a chainsaw carburetor? We'll have to disassemble - otherwise it will not 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 it is they who are clogged - it is easier to clean the filter or replace the spark plug than to clean the carburetor on a chainsaw. By the way, it is the problem with the candles that is the reason why the chainsaw shoots at the carburetor - too late ignition leads to the formation of an excess of the air-fuel mixture, since it does not have time to burn completely.If the problem persists, the carburetor will have to be removed. It is very easy to do this: