How to Remove a Husqvarna Saw Carburetor • AURAMM.RU

Cleaning the carburetor of a chainsaw of any modification, configuration and power follows one traditional and correct scheme, and its need arises as a result of clogging of the part. To understand that it’s time to clean the carburetor, you can observe how the saw starts up and immediately stalls, perhaps still “puffing”, making sounds trying to get the desired speed. One way or another, cleaning the carb with your own hands is quite possible, because our specialists provided instructions and demonstrated a video on how to do it quickly and correctly. Regarding proper cleaning, here we are talking not only about the use of certain products and liquids, but also about the format of purging, putting the carburetor back together, and also checking its readiness for future work.

Sometimes spare parts for a chainsaw do not need repair and cleaning, but timely replacement. Therefore, while your carb can still be cleaned and returned to its original working condition, take the advice from KosiKos and let your mechanism be healthy!

How to properly adjust the carburetor of a Husqvarna chainsaw with your own hands

A chainsaw is an indispensable tool for people living in private households. It is a mechanism consisting of painstakingly fitted parts and assemblies.

Like any mechanism, it requires repeated maintenance and adjustment. Especially due to poor fuel. Let's look at the principles and procedure for adjusting the carburetor of a Husqvarna .

How to remove the carburetor and whether it needs to be done before tuning

In this case, if the chainsaw does not develop speed or, on the contrary, operates at too high speeds, the carburetor can be adjusted without removing it.

But if the chainsaw does not start, the speed hangs at the same level or it works unstably. Adjusting the chainsaw carburetor will not change the situation. It needs to be removed

for cleaning or replacing parts. In all this, you need to act in the following order:

After unscrewing the retaining fasteners, remove the upper casing of the saw.
We remove the gasket and part of the air filter by unscrewing the bolts or snapping off the fasteners.
There is a fuel hose on the right side of the carburetor. We remove it together with the air damper control rod.
Remove the carburetor from the mounts holding it.

Disassembly of the carburetor is carried out in accordance with the instructions supplied with the kit. When disassembling, take special care to place the parts on a fabric prepared in advance. Due to its small dimensions, there is a risk of losing components during disassembly and washing.

All parts purchased this way are washed in special water, dried and wiped with a lint-free cloth.

Channels, tubes and jets are purged with compressed air, if possible, having previously washed them in an ultrasonic bath.

Repair and adjustment of a chainsaw carburetor in detail in the video

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 there is no need to constantly clean the contacts and adjust the gap between them. The air-fuel mixture to operate the engine is mixed in the carburetor. Using a special damper, you can manually lean or enrich the fuel mixture for a specific purpose - for example, for cutting hard wood.

Both the health 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.

The design and principle of operation of the carburetor

The carburetor serves to prepare a flammable mixture in a proportion determined by the operator from gasoline and air.

The correct functioning of the device depends on the correct options and adjustments.

And for this you should know the mechanisms of operation of the Husqvarna chainsaw

Its design consists of the following parts:

housing with clamping bolts and a set of gaskets;
fuel pump - a device that pumps a gasoline-oil mixture into the carburetor;
diaphragm - designed to limit the flow of flammable mixture into the engine;
float chamber - fuel is collected in it, the level is adjusted by a float, if necessary, the mixture is supplied to the main chamber for mixing with air;
main chamber - air passes through it, and fuel is injected there, the amount of consistency supplied to the engine is regulated by a throttle valve located right there;
diffuser - a narrowing section of the air supply tube at the point of fuel injection;
needle valve - a device that regulates the supply of fuel;
jet - screws that regulate the flow of mixture at high and low speeds, as well as an idle screw.

Also in the carburetor device, in addition to the throttle, there is a damper located at the inlet of the air filter. It artificially reduces the air supply, making the mixture richer to make it easier to start a cool engine.

The nozzle valve is responsible for injecting fuel into the main chamber, and it also prevents the entry of air. When setting up a carburetor on a Husqvarna chainsaw, special attention should be paid to this valve, since its condition has a direct impact on the operation of the engine. If stored for a long period of time, the nozzle may stick. This will limit the flow of fuel and prevent the engine from starting.

Also, due to long-term use or due to industrial defects, the valve may allow air into the main chamber. In this case, only replacing it will help correct the problem.

The carburetor works as follows: the air flow, entering the diffuser, is mixed with the injected fuel, and the resulting mixture is supplied to the engine. The amount of consistency is controlled by the throttle valve. The greater the consistency, the higher the engine speed.

Why do you need to adjust the Husqvarna carburetor?

The carburetor is one of the fundamental mechanical components that make up the chainsaw

.
Its tasks are to mix fuel with air and supply the resulting composition to the engine. But during the operation of the chainsaw, situations arise when adjusting the Husqvarna carburetor becomes necessary. Depending on the reasons, the carburetor of the chainsaw model 142 and other series is adjusted to prevent the following situations:

the presence of interruptions in the operation of the motor, accompanied by its shutdown;
excessive fuel consumption during operation.

Since the carburetor affects the quality of the fuel, in the first case, the need to adjust the carburetor of the saw 137 or other professional series, such as Husqvarna 240 or 260, implies an influence on the sufficient amount of combustible raw material entering the carburetor for mixing with the air mass. It is known that maximum performance is possible only with a certain ratio of these substances. The second point in adjusting the carburetor mixer of a chainsaw is caused by a lack of incoming air, which causes the injected gasoline to fail to burn and be released in the form of thick smoke. A timely change of parameters with your own hands to reduce the amount of injected fuel will allow you to significantly faster reduce the consumption of this product.

When adjustment is necessary

The need to adjust the carburetor of a chainsaw appears occasionally. More often problems arise with the supply of fuel, air or wear of parts. But from time to time adjustment is still required:

a running engine stalls after a few seconds, or does not start - the reason for this is a very rich mixture;
excess emissions, high speeds, increased consumption - in this case, on the contrary, the mixture is very lean, i.e. there is not enough air;
the revolutions remain at the same level after they are lowered or increased by the operator - the cause may be a stuck needle valve.

The reasons leading to such changes may be the following:

Powerful vibration damages the protective cover, and the adjusting jets are unscrewed, changing the setting. In this case, you may need to adjust the carburetor on the chainsaw.
Wear of parts of the piston system. In such a situation, adjusting the carburetor can provide temporary assistance. It is recommended to replace worn components.
Poor fuel, a faulty filter or long-term storage can cause blockages. In this situation, the carburetor must be removed
, washed with a special liquid or clean gasoline, reassembled and adjusted again.

The best way to start adjusting the operation of the saw is to check the jets, fuel and air supply. Then proceed to dismantling the carburetor, and later to checking the piston system.

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When to flush the carburetor

There are no strict requirements for how long it takes to clean the carburetor, so this procedure should be carried out when the first signs appear. In order not to have to guess what is the cause of certain chainsaw malfunctions, you should pay attention to some factors. These factors indicate the need for flushing the tool’s carburetor:

When you have difficulty starting the engine
If there are interruptions in the operation of the internal combustion engine, the speed fluctuates, the unit does not develop full power, and idle instability is also detected
Dips are detected when the accelerator trigger is pressed sharply
If the chainsaw starts, but immediately stalls when the speed increases
If black smoke is detected coming from the muffler
When an increase in fuel consumption is detected
If the setup procedure does not make it possible to achieve a positive result in normalizing the operation of the internal combustion engine
If the engine runs cold and when warmed up it starts to malfunction

It is worth noting that disassembling this mechanism without a proper reason is not recommended. When the first signs of a device malfunction are detected, it is necessary to intervene immediately, since postponing repairs contributes to accelerated engine wear.

This is interesting!
You must also understand that it is necessary to start repairing the carburetor last, after first diagnosing the tool. If, based on the diagnostics, a conclusion is made that the device in question is malfunctioning, then it is necessary to begin cleaning and repairing it.

How to adjust correctly

For this purpose, the design of the device provides three adjusting jets. The idle adjustment screw (T) is located at the top of the carburetor. Below there are a pair of jets for adjusting the fuel supply at low (L) and high (H) speeds, left and right, respectively.

The procedure for adjusting the carburetor on a Husqvarna chainsaw is as follows:

Warm up for 5 minutes.
By turning screw L, we bring the engine to the highest speed in an unloaded state and return it back a quarter turn.
Hold the gas button with one hand for fifteen seconds. At this time, turn the jet H to the right until it stops and reach the highest speed. After this, turn it back one and a half turns or until the “squealing” of the motor disappears.
After releasing the gas, turn the idle speed screw (T) clockwise until the chain begins to move. Then we rotate it in the opposite direction until the chain stops moving.

During the adjustment process, a situation may arise in which the chainsaw stalls. This may be due to extremely tight jets or a very rich or lean consistency.

If this happens, you need to tighten the low and high speed jets all the way. After this, turn them back one and a half turns and try to start the saw.

Setting the ignition after adjusting the carburetor

If cleaning and adjusting the carburetor does not correct the existing problem, you need to check the spark plug and adjust the engine. You should act in the following order:

The candle is turned out and a visual inspection is carried out. If it is dry with a slight brown soot, it can be considered in good condition.
If traces of gasoline are found on the spark plug, the carburetor should be re-adjusted. This happens because it supplies excess fuel to the internal combustion engine, flooding it.
If the spark plug looks normal, check the operation of the electrical equipment. First the cable that supplies current to the spark plug. Its end is brought a short distance to the radiator grille of the cylinder and the starter is turned with a cord. The spark should jump. If it is not there, the cable is inspected by a tester and replaced as necessary.
If the cable is in good condition, test the ignition coil. If the inspection does not reveal singed or broken wires, the coil is run through a tester, comparing the data with the accompanying documentation. If deviations are detected, the block must be replaced with a similar one.

After replacing the coil block, the gap in the magneto should be adjusted. The gap between the ignition coil and the flywheel should be from 0.2 to 0.4 mm. To set the gap you need a set of feeler gauges or you can use foil of a suitable thickness. The probe is clamped between the coil and the flywheel at the time of installation, and then pulled out.

Repair of Husqvarna chainsaws 435, 450

Is it possible to convert a Husqvarna 435 chainsaw from 0.325 1.3 to a 3/8 1.3 chain?
What model is the drive sprocket suitable for? Will the drive sprockets with replaceable ring from the 346 XP, 353 or 262 models fit it? From 353 and 262 they definitely don’t fit. Husqvarna has practically no interchangeability. If Oregon has managed to start doing something, it sometimes helps out. But, in my opinion, there is nothing suitable for conversion yet.

Chainsaw Husqvarna 435. In use for six months, and formally we went out into nature to relax 5 times. Branded oil. For chain lubrication - M8. Even the first chain has not become dull. Problem: Started to be harmful when starting up. When the brake is released (in safe mode), it does not want to start, and it feels like something is preventing the crankshaft from rotating when you pull the starter. If you simply pull the starter cable, you feel a significant load. When you turn on the brake (in operating mode), it starts easily and without problems. However, I don’t like the way the engine works—it jerks too much. I take off the tire, it starts up perfectly, it runs stable, but it also jerks a lot. When you turn it off, it stalls clearly, but with a very strong metallic clang. This didn't happen before. And what else I noticed was that the clutch disc itself under the cover began to strongly scratch the cover from the inside, even gnawing out grooves. However, when I try to pull the disk along the crankshaft axis with my hand, it doesn’t even move. What to do?

Such damage to the cover occurs when the clutch is twisted from the shaft. In principle, this is a rarity, the thread is left-handed and can be tightened, but it does happen. With the tire and cap installed, you need to give full throttle and click the brake at full speed. And do this three times. Usually after this the coupling is tightened tightly.

New Husqvarna 435 chainsaw, started only in the store (by the way, it didn’t start right away). I arrived at the dacha and that’s it, it won’t start even once, I checked everything, and looked at the spark plug (there is a spark) and the fuel is pumping. After trying to start the spark plug, I unscrew it, it’s all covered in gasoline, it’s stuck. I dry it, clean it, close it, start it, same story, open it, all covered in gasoline. When starting, I close the shutter, as it is written in the instructions for a cold start. True, then I tried both open and closed, everything was the same, not the same setting. Can you recommend anything?

Try a little differently - turn out the candle, you don’t need to burn it or dry it in any way, just blow hard on the electrodes. Turn off the ignition (required) and crank the engine 10 - 15 times with the starter. Screw in the spark plug and try to start it not with the valve closed, but with it closed and open. The carburetor will switch to starting gas. It should start. As soon as she screams, press the gas. And dry the engine with small gases until it stops smoking. If this doesn’t help, call the service and let them sort it out.

I bought a Husqvarna 435 chainsaw today, it started the first time in the store, they brought it home, tugged, tugged, it wouldn’t start, then when I pressed the gas it started, the question is: do new models have such a problem with starting? And does a new chainsaw need a break-in?

It didn’t start right away, most likely due to inexperience. There is no need to break it in, just don’t overheat it, run it for a bit, turn it off and let it cool down. Dilute the mixture strictly according to the proportion indicated on the branded oil, and not as the dealer said.

Tell me, the Husqvarna 435 chainsaw did not develop speed, it seems to accelerate at idle, but when you start cutting a tree, it doesn’t have enough speed. It hums when you saw, like howling, we took off the spark plug, cleaned the filter, it started working, then after sawing some more the same thing started. This time the air filter had already become somewhat dark, I cleaned it with a cotton swab and blew out the hoses. But it still doesn’t work because it needs to be done earlier. What do you advise?

Try replacing both the fuel and air filters. To check, you can simply remove them and work without filters.

Explain, when you remove the filter there are two dampers, as I understand it, air enters from the top, then into the filter, then into the lower damper and into the carburetor. Where does the air initially come from? because the filter is completely closed.

The filter itself is shaped like the letter “L”. The air from inside the saw passes through the mesh from the bottom of the horizontal section to the top, then along the vertical section it falls down into the carburetor. The upper valve in the carburetor opens and closes synchronously with pressing and releasing the gas button, the lower one is the suction necessary during a cold start. Air flows, both through one and through the second, go in the direction from the rear handle to the front.

I purchased a Husqvarna 450 chainsaw, please tell me if the chain oil should leak. After working, I noticed that chain oil was dripping from the bottom of the saw. Is this normal or some kind of defect?

After working with the chain, bar, or cover, the remaining oil drains off.

The other day I bought 435. I burned 1 liter. 1st tank at idle, 2nd with adding gas at 3/4, 1/2 revolutions for 4-5 seconds, after 5 minutes. work at idle speed, as advised by an experienced person. I immediately noticed the rough operation of the engine! And in general, the symptoms are as follows: something prevents the crankshaft from rotating, when you turn on the starter, the engine jerks strongly during operation. It stalls well, but with a strong metallic squeak. It starts for me, but always right away, only when it’s hot. I sawed a couple of thin, dry logs, sawing great. But her work stresses her out, as if something might come out. I also noticed that when the sprocket rotates without a chain, it jams a little, you have to turn it with force, after which it rotates normally for some time. What should I do?

Don't run it at idle speed at all. All break-in occurs only at work. The drum must move along the shaft, which is why there is a metallic ringing when the saw is idling. Resistance to crankshaft rotation is most likely compression. Try to unscrew the spark plug and pull it without it (just be sure to turn off the ignition). The resistance will drop sharply, leaving just barely noticeable when the magnetic shoe passes by the ignition module. If resistance to rotation remains without a spark plug, something is wrong. If the engine jerks at idle, it's normal. Any two-stroke in this range runs unevenly. If it works unevenly at maximum speed, try replacing the spark plug to see if it begins to die (it may cause interruptions in spark formation). There can also be a clanging sound when the engine stops - it’s their starter dogs returning to their place and clanking against the stops. It gets pretty loud. The clanging sound should occur during the transition from idle to operating speeds - the clutch weights diverge and knock on the cup. And the cup is still clean, it rings loudly. Then it will become overgrown with dust and oil, and it will be quieter.

I purchased and use a Husqvarna 450 saw, it worked flawlessly, after the warranty expired, problems began, at the moment I am suffering from this problem - you start it, it works fine at idle, but as soon as you give it a rev, it immediately starts stalling, it feels like it There is not enough power, I checked, cleaned, everything possible, the problem has not been resolved, tell me what could be the problem? The carburetor has been washed and purged several times, and the fuel filter is being purged.

It looks like the problem is in the carburetor or the impulse pipe.

Does the starter on the Husqvarna 435 chainsaw work fine for everyone? We have been working with a saw since the year before last. 4 starters are already broken. The teeth break off - there are only 2 of them. The old ones had 4 and stronger ones. What to do?

Try installing a starter from the 440 model. It has 4 teeth, unlike the original 2 teeth. I've had it on my saw for almost a year now. Launching has become easier and more convenient. When installing the starter, be sure to check the gap between the ignition module and the flywheel.

2 Husqvarna chainsaws 450 (3 years old) and 445 e2 (new) both behave the same, while cold they work perfectly, when they heat up after using up one tank they don’t start until they cool down, I work in the summer, it’s hot around +35 somewhere. I did not observe such problems in winter. What is the reason? I suspect I need to somehow adjust the carburetor for the summer?

Why is primary adjustment needed?

Initial running-in of the chainsaw: working with narrow material

Most modern chainsaws are sold adjusted. Still, it doesn’t hurt to check the quality of industrial options - in the end, you will have to work with equipment specifically for you.

When starting up for the first time, the chainsaw should operate in a gentle mode. Therefore, for several hours after the start, it is recommended not to overload the engine and cut only small branches and trunks up to 10 cm wide.

you protect against malfunctions in the chainsaw carburetor :

Always mix gasoline and oil in accordance with the figures indicated by the manufacturer.

Proportions of fuel consistency for a chainsaw motor

The chainsaw must start correctly, ensure a measured speed of rotation of the sprocket and a smooth increase/decrease in power. There should be no external knocks, pops or noises when the engine is running.

Professional hand chainsaw at work

The main thing during the initial running-in of the tool is to ensure that the fuel consumption corresponds to the power used, i.e. in practice, the saw should not fade, “sneeze,” smoke, or operate jerkily.

Chainsaw won't start after winter

The reason that after the winter period the chainsaw refuses to work may be elementary - the fuel mixture has decomposed and lost its properties. To fix this problem, you need to pour out the old fuel, unscrew and dry the spark plug, fill the chainsaw with a new fuel mixture and idle the engine several times. After installing the spark plug in place and in the absence of other problems, the chainsaw will definitely start.

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How to adjust correctly

The procedure for adjusting the carburetor on a Husqvarna chainsaw is as follows:

Warm up for 5 minutes.
By turning screw L, we bring the engine to the highest speed in an unloaded state and return it back a quarter turn.
Hold the gas button with one hand for fifteen seconds. At this time, turn the jet H to the right until it stops and reach the highest speed. After this, turn it back one and a half turns or until the “squealing” of the motor disappears.
After releasing the gas, turn the idle speed screw (T) clockwise until the chain begins to move. Then we rotate it in the opposite direction until the chain stops moving.

During the adjustment process, a situation may arise in which the chainsaw stalls. This may be due to extremely tight jets or a very rich or lean consistency.

If this happens, you need to tighten the low and high speed jets all the way. After this, turn them back one and a half turns and try to start the saw.

Running in the Husqvarna 135 16 X-Torq model

In order for the new Husqvarna 135 chainsaw to last as long as possible and not bother its owner with unexpected breakdowns, you need to properly break in the recently purchased garden tool.

To do this you need to act in this order:

First you will need to prepare a suitable fuel mixture, which must be diluted only in the proportion specified by the model manufacturer

At the same time, special attention should be paid to the choice of engine oil. To avoid serious damage to your gasoline saw in the future, it is best to constantly use Husqvarna branded oil for preparing fuel. It contains all the necessary components that will make it easier to start the engine, reduce the volume of exhaust gases emitted by it, and also protect the engine CPG from corrosion and soot.

The oil must be diluted in pure AI-92 gasoline, purchased at trusted gas stations; After this, you need to add oil to lubricate the chain. For this purpose, the Husqvarna chainsaw has a separate tank; Then you need to start the saw, acting strictly according to the instructions in the instruction manual. After the first start, the engine of the garden tool should run at idle speed for about 15 minutes. In this case, every 30–45 seconds the operator must sharply press the gas trigger several times; Next, you can start sawing thin branches. It is prohibited to work immediately with thick wood, since increased load on the chainsaw engine will lead to the formation of burrs on the walls of the internal combustion engine cylinder; Thin wood needs to be sawed until the first tank is completely used up. Then you will need to thread the model again and start working with thicker wood.

It contains all the necessary components that will make it easier to start the engine, reduce the volume of exhaust gases emitted by it, and also protect the engine CPG from corrosion and soot. The oil must be diluted in pure AI-92 gasoline, purchased at trusted gas stations; After this, you need to add oil to lubricate the chain. For this purpose, the Husqvarna chainsaw has a separate tank; Then you need to start the saw, acting strictly according to the instructions in the instruction manual. After the first start, the engine of the garden tool should run at idle speed for about 15 minutes. In this case, every 30–45 seconds the operator must sharply press the gas trigger several times; Next, you can start sawing thin branches. It is prohibited to work immediately with thick wood, since increased load on the chainsaw engine will lead to the formation of burrs on the walls of the internal combustion engine cylinder; Thin wood needs to be sawed until the first tank is completely used up. Then you will need to thread the model again and start working with thicker wood.

What do you need to adjust a Husqvarna carburetor yourself?

To properly adjust the chainsaw carburetor

, you need to stock up on suitable equipment in advance.

The following list will be useful for you:

The most ordinary screwdriver, which is used to unscrew or tighten the adjusting screws;
A tachometer designed to count crankshaft revolutions. It is necessary when adjusting the idle speed, because it is quite problematic to find the rpm number by ear;
Phillips screwdriver. It is needed so that you can unscrew the screw (T);
A compressor with a special gun attached to it. A purge device will help get rid of excess debris and dirt, because the carburetor must always be clean.

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Troubleshooting and DIY repairs

Repairing a Husqvarna chainsaw is complicated by the fact that it requires specific tools that are usually not included in the arsenal of a home craftsman. But all of them can either be bought at an auto parts store or made by yourself.

Chainsaw Husqvarna 142 - technical specifications

In addition to the usual sets of screwdrivers and a hammer, you will need:

Piston stopper. Can be replaced with a synthetic cord from a starter with knots tied every 2–3 cm.
Screwdriver for bolt heads on a chainsaw. They can be specific - in the form of semicircles or stars.
Clutch adjustment key.
Combination spark plug wrench.
Compressor for cleaning internal volumes from sawdust, dust and dirt.

If you plan to clean and troubleshoot the cylinder-piston group, you will need a compression measuring device and an adhesive-sealant.

The procedure for disassembling a Husqvarna chainsaw is as follows:

Diagram of a device for checking the ignition of a chainsaw

the top cover is removed;
the emergency brake and saw bar with chain are disconnected;
the starter is removed;
the candle is unscrewed;
a piston stopper is installed through the spark plug hole and the flywheel is removed (considerable effort will be required).

After this, the front handle is disconnected, followed by the carburetor, oil pump and lastly the engine.

Troubleshooting the ignition system comes down to replacing failed spark plugs with new ones. Only Champion RCJ7Y spark plugs are used. The ignition coil in Husqvarna chainsaws is electronic, maintenance-free, and if it fails, it is completely replaced, like the starter.

Spark plug Champion RCJ7Y

There is no need to adjust the ignition system. The only problem that can be solved by adjustment is setting the gap between the flywheel and the coil. The gap is set using plumbing gauges. The standard value is 0.2 mm.

Setting up the fuel system

The fuel system of Husqvarna chainsaws is complex. At home, it is better not to repair it, as well as service the cylinder-piston group. The maximum malfunction that can be fixed at home is cleaning the breather, eliminating kinks in the hose and replacing the filter. The same applies to the oil system - troubleshooting comes down to cleaning the hole in the breather with a needle or compressed air. It is recommended to do this preventively every 2–6 months, depending on the intensity of saw work.

Chainsaw Husqvarna 142

Carburetor adjustment

The Husqvarna 142 carburetor has 3 adjusting screws, marked H, L and T. The first is designed to set the injection at maximum speed, the second at low speed, the third determines the fuel injection parameters at idle.

Adjusting the carburetor of the Husqvarna 142 chainsaw

First, the idle injection of the fuel mixture is adjusted by turning screw L ¼ turn counterclockwise. If the saw chain moves, the movement is stopped by clamping the screw T. The adjustment is made with visual and auditory control - the motor should not squeal and white smoke should not come out of it. The correct position of the screw is determined empirically.

After this, the chainsaw accelerator is clamped and the injection at high speeds is adjusted using screw H in exactly the same way.

The leakage of excess air into the carburetor is eliminated by replacing the torn hose - the black tube going to the carburetor, or by fitting it more tightly.

How to repair a Husqvarna carburetor with your own hands?

During use and diagnostics, deficiencies in the carburetor may be discovered. Most of them can be removed independently, with a minimum of knowledge and without calling a special repair center.

Among the ways to eliminate it are:

Replacing different gaskets at the joints of sealed parts;
Cleaning or replacing carburetor filter parts;
Replacement of pump parts or valves;

In fact, all of the parts listed above can be positioned as a repair kit, which is used for minor-urgent repairs of carburetors. After installing them, the carburetor of the Husqvarna 100 30 seven chainsaw can forever forget about malfunctions, and regulation will become easier.

How to install the repair kit?

If the problem concerns the carburetor nozzle, you can try to fix the serious problem yourself. But the manufacturer advises to deal with this problem only by replacing the device.

To remove

carburetor, you need to completely clean the pollen from sawdust and shavings.
To do this you need to use a compressor and a compressed air gun. Then the filter cover is unscrewed and the filter element is removed. All drives and throttle bodies are then disconnected from the Husqvarna . The carburetor can now be removed
from the saw.

Next, you need to completely disassemble the carburetor and change all the elements that the repair kit offers. Specifically, spare parts and gaskets. This will free you from damage in the future.

Now you understand how to adjust the carburetor of the famous Husqvarna 137 chainsaw.

How to remove the carburetor from a Husqvarna chainsaw

What is the factory setting for a Husqvarna chainsaw carburetor?

To ensure that the chainsaw still starts even if the settings are incorrect, the factory positions of the screws H and L are used. Most Husqvarna chainsaws can be started if both screws are unscrewed exactly one and a half turns. Only then can the positions of the screws be changed in order to achieve the appropriate fuel consumption and the greatest operating efficiency. XX is also regulated after these manipulations.

If you still have questions about adjusting the carburetor on the Husqvarna 100 30 seven chainsaw and other models in this line, I recommend taking a look at this:

How to clean the carburetor on a Husqvarna chainsaw

How to clean the carburetor on a chainsaw with your own hands

Before cleaning the carburetor on a chainsaw , let's look at the situations when it needs to be cleaned:

the saw does not start and stalls;
the tool does not start;
The tool stalls when you press the gas.

There are situations when cleaning the carburetor does not help, then you need to replace the repair kit; if after this procedure nothing has changed in the operation of the chainsaw - check the rubber adapter that is located between the cylinder and the carburetor (in its place there may be a rubber adapter with a brass insert). We remove the top cover, filter, long bolts, adapter, disconnect the tubes from the carb and remove it. Direct cleaning process:

first you need to clean it with a fluffy brush from external dirt and dust so that it does not get inside during disassembly;
we start with the “H” bolt, which is responsible for the upper working position of the carburetor at maximum speed. We twist it, counting and remembering the number of revolutions, for example, 2.5. Next we unscrew it
screw in screw “L” while counting the revolutions; it is responsible for low speeds. For example, 4.5 revolutions. We record the indicators and unscrew it;
remove the top and bottom covers using a screwdriver, unscrewing the bolts. It is better to do this not in a canopy, but on a hard, non-slip surface;
take out the needle;
if the gaskets and membranes are very worn out, worn out, they also need to be replaced with new ones, and you can order a carburetor repair kit for Husqvarna, Leader, Shtil or Partner saws in the KosiKosa store;
often before cleaning you can observe the following picture - in the “sump” and other containers there is a lot of dust and debris;
We clean the carb by first soaking it in its solvent, then blow it with compressed air using a compressor. We repeat the procedure 2 times. We clean the membranes separately and put them back together. First we put the needle in place;
We mount the rocker support back onto the needle;
depress the spring and squeeze out the fixing bolt;
put the membrane and bottom cover in place and tighten it with bolts (you need to remember or sign which ones secured it);
We also put the upper membrane with the lid in place and tighten it with bolts;
place screw “L” all the way, and then unscrew it 4.5 turns, (as an example) as it was on the carburetor, and screw “H” also screw in until it stops and unscrew it the same 2.5 turns (as an example ), maintaining the previous settings. This is necessary in order not to lose settings;
we return the carburetor to its place in the chainsaw for checking, putting it on the throttle valve;
the hose coming out of the cylinder is hung on the top, the hose coming out of the tank is on the right side of the carburetor, and the hose that goes for pumping from the primer is on the left - we connect all the hoses to the carburetor;
insert 2 bolts into the adapter and put it in place;
close the flap, press the primer several times (10 is enough);
We are trying to start the instrument.

As you can see, cleaning the carburetor of your tool with your own hands is not at all difficult if you follow the instructions, chronology, fix the maximum and minimum screw speeds, and assemble the unit in exactly the opposite order. The KosiKosa petrol tool store also demonstrates a high-quality video, where all the instructions are clearly supported by a clear example.

Carburetor cleaning and everything about it: useful tips

cleaning a chainsaw carburetor is . We have described all the nuances and little things, and now in the summary we will consider other options for breakdown or malfunction of the tool that accompany carb clogging, which also need to be paid attention to:

failure of the rubber adapter. When it breaks through, the chainsaw shows the same non-working symptoms as with a clogged carburetor. It is located between the cylinder and the carb;
you can also hear its name as a pipe. In addition to the fact that the carburetor in the saw is clogged, the pipe may rot;
Cleaning the carb will not be enough; you will have to change the rubber adapter. Our catalog will help you do this easily;
the fuel filter retainer may be cracked or broken, accordingly, all dirt enters the carburetor;
the mesh on the crab, which is supposed to clean the gasoline that passes from the tank to the needle, may be clogged;
do not forget to record the number of revolutions by which the screws “H” and “L” were unscrewed. By correctly returning them to their place, you will save the carburetor settings, but this is a completely different article...

In this article, we showed a detailed video on how to clean the carburetor and all the elements connected to it so that your saw works. They also provided a fair amount of advice. If you make it a rule to clean it regularly, change the filter in a timely manner, check the strength of the fixation, and acquire a carb repair kit in advance, then this complete cleaning procedure will have to be done extremely rarely. It's also important to use quality fuel to ensure your carb has a good mixture to work with.

Adjusting the Husqvarna carburetor 137, 14, 435 and other models. Do-it-yourself Husqvarna chainsaw carburetor adjustment

Why do you need to adjust the Husqvarna carburetor?

The carburetor is one of the fundamental mechanical components that make up the chainsaw

the presence of interruptions in the operation of the motor, accompanied by its shutdown;
excessive fuel consumption during operation.

Since the carburetor affects the quality of the fuel, in the first case, the need to adjust the carburetor of the saw 137 or other professional series, such as Husqvarna 240 or 260, implies an influence on the sufficient amount of combustible raw material entering the carburetor for mixing with the air mass.
It is known that maximum performance is possible only with a certain ratio of these substances. The second point in adjusting the carburetor mixer of a chainsaw is caused by a lack of incoming air, which causes the injected gasoline to fail to burn and be released in the form of thick smoke. A timely change of parameters with your own hands to reduce the amount of injected fuel will allow you to significantly faster reduce the consumption of this product. Do-it-yourself repairs will save not only the budget, but also the time spent on transportation and queues in the workshop. The same applies to replacing various spare parts in gas-powered tools, such as a chain for a chainsaw or a universal trimmer head for a brush cutter, or oils for electric drive products.

When is it necessary to adjust the carburetor of a Husqvarna chainsaw?

Neglecting deviations in the normal operation of a gas-powered tool risks the fact that even with a strong desire, adjusting the carburetor of a Husqvarna chainsaw may turn out to be useless and either this unit or engine elements damaged by prolonged thermal or mechanical loads will need to be replaced. Therefore, as soon as the saw shows the first deviations, repairs should be immediately carried out in the form of simple adjustments. Among these changes in work we note:

How does a chainsaw carburetor work?

carburetor Stihl MS 100 eighty-one C BE

Chainsaw carburetors may differ in design. But their basic elements and operating mechanism remain approximately similar.

Carburetor design:

Base

This is a wind tunnel, across which an air damper is placed - with its help the intensity of the air supply is regulated.

This part is where the base tube narrows - here the air flow speed increases, i.e. air is always supplied to the carburetor under a certain pressure.

In this area, the fuel comes into contact with the air flow. Fuel enters the atomizer from the float chamber through a nozzle (dispenser).

Float chamber

This is a container that allows you to keep the fuel mixture in a measured state.

Chainsaw carburetor design diagram

A chainsaw carburetor works according to the following principle:

when the engine starts, the main damper opens and a stream of air is supplied into the air channel at a certain speed;
the speed of the air flow, as well as the level of the float in the chamber, are regulated by the position of the damper, specifically due to the difference in pressure in the float chamber and the air channel;
fuel from the float chamber is sucked into the nozzle, and from there into the diffuser;
passing through the diffuser, the air captures the fuel entering it;
the resulting mixture is fed into the cylinder cavities through the intake channels.

The mechanism of operation of a chainsaw carburetor

The pressure in the float chamber is approximately equal to atmospheric pressure, but a vacuum appears in the air channels of the carburetor when the chainsaw engine starts. Opening the damper increases the air supply intensity. As a result, more fuel enters the carburetor, and the number of engine revolutions increases.

Cleaning correctly

To properly clean your chainsaw, you will need the following tools:

Phillips and flat screwdriver,
wrenches with heads of different sizes,
special cleaning composition, cleaning cloth,
ultrasonic cleaner.

The set of tools can be seen in the photo.

Cleaning the carburetor of a chainsaw should be done according to the following algorithm:

First you need to drain the remaining fuel from the fuel tank. Remove the cover of the chainsaw by unscrewing the fasteners. We take out the filter and disassemble the housing, removing nuts and clamps if necessary.
Remove the fuel mixture supply hose from its clamp, unscrew the fasteners of the carburetor top cover. How to clean the carburetor of a stihl ms 180 14 chainsaw? And adjusting the chainsaw carburetor. Then remove the top cover and the blue gasket - this is the fuel pump membrane. The chainsaw must correctly recognize malfunctions in the chainsaw's carburetor. To the left of the body there are spring clips, remove them, and then the screws. It is advisable to label the parts and schematically record the places from which they were removed, so as not to confuse anything during assembly.
Remove the bottom carburetor cover, unscrew the screw and remove the needle valve and the spring under it. Repairing a Husqvarna 137 chainsaw, what goes into the carburetor is how to remove the sprocket from. Then, using longitudinal force, remove the air damper and its axis.
Remove the throttle valve, drive lever and throttle shaft.
We lay out all the removed carburetor parts on a flat surface and inspect them to ensure integrity is maintained. Carburetor of the Husqvarna 142 chainsaw. Parts with a high degree of wear must be replaced with new ones.
Using a specialized cleaning agent, wash the parts and dry with a lint-free cloth. The tubes must be blown under pressure using a pump.
To achieve maximum effect, you can clean the carburetor on a Shtil chainsaw using a special cleaning bath, the basis of which is the cavitation effect. The bath is filled with diesel fuel, and the carburetor parts are immersed in it for several minutes. Finally, we dry the parts using a pump.

Author: Maria Sukhorukikh
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Nuances of adjustment

After the adjustment, the chainsaw should simply pick up and drop speed, work steadily at low and high speeds. If the saw chain spins at idle after adjusting the carburetor control screws, this is a sign that the adjustment was carried out incorrectly and the position of the screw (T) needs to be adjusted.

Also, when adjusting the Husqvarna carburetor, it is worth taking into account the response time of the chainsaw to the rotation of the screws. Options do not change immediately, but within 5, 10 seconds.

One of the characteristics of an incorrectly carried out adjustment is strong smoking when the saw is operating, which indicates a large amount of fuel entering the combustion chamber. If such a situation occurs, it is necessary to adjust the position of the screw (L).

The manufacturer emphasizes that the saw should not be used until the chain has been treated with a sufficient amount of oil. Before work, you need to read the summary, and because of this, you can find out about safety measures at work.

For example, if you connect the chain and saw blade incorrectly, this will increase the possibility of kickback. But even if you become familiar with the controls, it is impossible to predict the likely situations when working with the saw, so the operator must be careful and use common sense. When working, protective headphones, a special helmet, goggles and overalls are required.

Maintenance of the Husqvarna chain saw 435

The owner of a Husqvarna chainsaw must regularly perform the following maintenance work:

clean gas-powered tools from sawdust and dirt;
keep the chain sharp;
maintenance of oil-conducting channels;
monitor the tire condition;
change (clean) the spark plug in a timely manner;
maintain filters;
if necessary, adjust carburetor settings;
Fill fuel and oil in a timely manner and prevent containers from emptying.

Malfunctions

Why the chainsaw does not start, it stalls:

carburetor not adjusted;
ran out of fuel;
poor fuel quality;
problems with candles;
ignition does not work;
filter cleaning required;
The piston group is worn out.

Recoil during operation:

the operator is sawing incorrectly (sawing with the end of the tire is dangerous and prohibited);
The tire is not secured correctly.

The saw began to consume a lot of fuel:

The filter is worn out and requires replacement.

The chainsaw vibrates strongly during operation:

The design and principle of operation of the carburetor

The carburetor serves to prepare a flammable mixture in a proportion determined by the operator from gasoline and air.

The correct functioning of the device depends on the correct options and adjustments.

And for this you should know the mechanisms of operation of the Husqvarna chainsaw

Its design consists of the following parts:

housing with clamping bolts and a set of gaskets;
fuel pump - a device that pumps a gasoline-oil mixture into the carburetor;
diaphragm - designed to limit the flow of flammable mixture into the engine;
float chamber - fuel is collected in it, the level is adjusted by a float, if necessary, the mixture is supplied to the main chamber for mixing with air;
main chamber - air passes through it, and fuel is injected there, the amount of consistency supplied to the engine is regulated by a throttle valve located right there;
diffuser - a narrowing section of the air supply tube at the point of fuel injection;
needle valve - a device that regulates the supply of fuel;
jet - screws that regulate the flow of mixture at high and low speeds, as well as an idle screw.

Also, due to long-term use or due to industrial defects, the valve may allow air into the main chamber. In this case, only replacing it will help correct the problem.

READ Saw Stihl Ms 180 Won't Start

Chainsaw carburetor design

Almost all chainsaw models use an identical carburetor design. As an exception, we can name the carburetor of some very cheap Chinese chainsaw - some parts may be missing, and most of the components are made of very cheap materials.

The main components of the carburetor are:

Frame. It is made of aluminum to make the structure lighter and has a one-piece shape. The housing contains a diffuser, an inlet fitting, a pulse channel, a main screw and an idle screw, a damper that regulates the air supply, as well as other elements.
Diffuser. Located at the carburetor inlet.
Jets. Special valves through which the amount of fuel is regulated.
Spray.
Float chamber.

Approximate diagram of a chainsaw carburetor

In what cases does the Husqvarna chainsaw carburetor require adjustment?

There are quite a few problems that can be solved by adjusting the carburetor. Adjusting the carburetor of a Husqvarna chainsaw is necessary when defects such as:

high idle speed;
strong smoke when operating the tool;
Difficulty starting a cool or hot engine;
lack of traction and low maximum speed.

This is by no means a complete list of problems that can be solved by tuning the Husqvarna carburetor. In a number of different cases, adjusting the properties and amount of fuel consistency is carried out after a half-year engine repair or during scheduled maintenance of the chainsaw.

How to recognize carburetor failures?

Typical carburetor malfunctions are easy to recognize. They are expressed in the fact that the chainsaw engine starts and immediately stalls or shows no signs of life at all. Well, or it consumes fuel with all its might, producing clouds of black smoke and aggressive vibrations instead of the required power.

Operation diagram of a chainsaw carburetor

Carburetor settings may be affected by:

lack of fixation of the adjusting screws;

Chainsaw adjustment screws

New CPG chainsaw Husqvarna 365

Chainsaw air filter with nylon insert

Any problems found should be corrected immediately. But how can you determine that the problem is in the carburetor? To do this, watch how your tool works.

Typical signs that the carburetor settings are off include:

Unstable motor operation

As a rule, the reason for this is the use of the wrong (lean) fuel mixture.

Excessive fuel consumption

It is expressed in an increased release of exhaust exhaust, which turns black. This means that fuel is not completely consumed, i.e. the mixture is oversaturated.

The carburetor is adjusted correctly - the saw starts the first time

Arbitrary changes in engine power

May be associated with damage to the fastening of the adjusting screws or the protective cap.

Increased fuel consumption accompanied by vibrations and pops

This indicates critical wear of the piston group, so adjusting the carburetor will only postpone major repairs for some time.

Sneezing and engine jerking

This picture is observed when the carburetor channels are clogged or its filters are faulty. In this case, adjustment should be carried out only after thoroughly washing the unit.

Chainsaw fuel filter

Despite the fact that the carburetor is the most complex part of the engine, you should not be upset if you detect malfunctions in its operation. Instead, you need to arm yourself with some tools, a design diagram of the unit and sound logic.

Chainsaw carburetor being repaired

Technical characteristics of the Husqvarna 240 chainsaw

The basis of the Husqvarna 2040 saw is a 2-stroke engine with a carburetor. Works on a gasoline-oil consistency. The engine life is increased due to improvements in the crank assembly and a special cylinder coating. Fuel economy is reduced by 20% thanks to the innovative X-Torq system, which also reduces the harmfulness of exhaust gases. A capacious fuel tank and low fuel consumption extend the operating time of the tool, without interruption for refueling.

Otherwise, the saw has the following technical properties:

productivity - two liters. With.;
chain pitch - 3/8 inch;
fuel tank capacity – three hundred ml;
oil tank - two hundred ml;
tire length – 40 cm;
weight – 4.7 kg.

Design and scope of use

The use of the Husqvarna 2040 chainsaw is not limited to the standard functions of collecting firewood. With its help, you can simply clear a huge area of bushes and old trees, form crowns of ornamental plants in the garden, and use it in construction for cutting boards. Sufficient power and length of the bar allow you to cut wood both lengthwise and crosswise.

The traditional design of the brand is mixed in this model with the highest technical features and ease of use. Husqvarna 2040 saw Manufacturers have provided this saw with such necessary functions as easy starting, double air purification, and reduced vibration levels. Ergonomic control levers and handle provide maximum operating comfort and reduce the load on the operator. The main components of the mechanism are placed in such a way as to speed up and simplify access to them in case of repair.

If you follow the operating instructions and frequently carry out preventive inspections of the chainsaw, repairs can almost always be avoided. But even in the event of a breakdown, the tool will not cause you significant inconvenience - unique spare parts can simply be purchased and replaced. Detailed structure of a Husqvarna chainsaw

two hundred 40 is shown in the diagram below:

Chainsaw “Husqvarna 240”, the technical properties of which you can see below. This is equipment that follows the Husqvarna 236 mowing line. If we compare these two variations, it is necessary to emphasize that the latter has higher power, slightly longer tires and has an engine that saves fuel up to 25%.

The Huskvarna 240 chainsaw, which does not require repair very often, is an environmentally friendly tool, which is very important for some consumers. The volume of harmful emissions into the atmosphere is reduced, and the number of cuts on one fuel for refueling increases. Quite often, the products of the aforementioned Swedish company are compared with the chainsaw manufacturer Stihl. As an advantage of the first, it must be emphasized that a primer is available to simplify starting. But, as practice shows, this does not have a significant impact on the equipment startup process.

Reviews about the model

Advantages can be considered:

brake lever;
economical fuel consumption;
presence of an anti-vibration system.

But this list of consumers is not considered complete. They like the presence of a brake lever in the model; it is attracted by both the ergonomic design, the small exhaust volume, and the presence of a chain tensioner.

This model costs thirteen,000 rubles. and has an air cleaning system that reduces filter wear. The engine in the device is quite reliable and powerful; it promotes economical fuel consumption, reducing the amount of harmful emissions. During startup, the chainsaw needs to be warmed up. Once the cool tool is launched, you should let it run for 30 seconds. Then you can use and release the throttle lever. This will prepare the tool for work.

The Husqvarna 240 chainsaw described in this section, the technical properties of which are fascinating to you, has a 40 cm tire and a two-liter capacity. from. The engine power is 38.2 cm 3, and the fuel tank. 0.3 liters. Pour oil into the tank in an amount of 0.2 liters. Before purchasing this equipment, you need to consider that it is household grade and weighs 4.7 kg. The number of connections in the equipment is 56, slot width. 1.3 mm, but the noise level is 100.7 dB.

Chainsaw Husqvarna 142 - features of operation and maintenance

The Husqvarna 142 chainsaw is used for work in the garden and at the dacha; it is an excellent option both for felling trees and for collecting firewood. The Husqvarna 142 chainsaw has technical characteristics that provide maximum performance and safety. The engine speed reaches nine thousand units per minute. The cylinder size is nominally 40.2 cm³. The fuel tank capacity is 410 ml and the oil tank is 200 ml. It is worth considering that the noise level is 118 dB. The mass of the unit is 4.6 kilograms. The length of the tire is from 33 to 38 centimeters, the chain pitch is 0.83 centimeters.

Advantages of the model

The relatively light weight of the Husqvarna 142 chainsaw and the ergonomic design, combined with the curved front handle, make the operation of the equipment as comfortable as possible.
The anti-vibration system allows you not to feel tired for a long time.
A guard and chain brake are provided to ensure user safety.
The power of the Husqvarna 142 chainsaw is increased through a forged crankshaft consisting of three sections.

Possible malfunctions of the Husqvarna 142 chainsaw

Like any other devices whose operation is associated with intense loads and difficult conditions, Husqvarna 142 chainsaws can fail, and the causes of problems can be divided into two groups:

Engine or piston group failure. Problems with the fuel, exhaust or ignition system.
Problems that have arisen in mechanical components - tire, clutch, brake or lubrication systems.

Engine

Engine breakdown is one of the most common and time-consuming. This problem is manifested by the following factors:

Unstable operation at idle.
Does not start.
There is not enough power, or the Husqvarna 142 chainsaw starts and stalls as soon as it starts to pick up speed.

Before you begin repairing the Husqvarna 142 chainsaw, it is recommended to conduct a complete diagnosis of the equipment to accurately determine the causes of the problems.

The reason why the Husqvarna 142 chainsaw does not start

If the Husqvarna 142 chainsaw does not start, there may be several reasons. The most common ones include the following:

Damage to spark plugs - to understand whether a spark plug is working properly, you need to unscrew it and inspect it. If the porcelain insulator has cracked, you see a burnt or damaged electrode, you should immediately replace the spark plug. In addition, after working for several seasons, the Husqvarna 142 chainsaw requires inspection of spare parts. Spark plugs also wear out their lifespan, and to ensure the safety of the saw, replace them with new ones.
Carburetor clogged - during operation, gradually, fuel vapors settle on the internal walls, forming a sticky consistency that can clog the carburetor, preventing the engine from starting. You will need to clean it with a special detergent. When repairing a Husqvarna 142 chainsaw, carburetor adjustment is always carried out with a warm engine and cleaned systems.
Malfunction of the ignition coil - before you decide to replace this part, make sure that the spark plugs meet the required technical condition.

How to adjust the carburetor of a Husqvarna 142 chainsaw

Adjusting the carburetor of the Husqvarna 142 chainsaw should be done with the engine warm

Pay attention to the condition of the air filter, which will need to be cleaned if necessary and make sure it is not clogged. Adjusting the carburetor of the Husqvarna 142 chainsaw with your own hands is done using three screws:

L – for low engine speeds.
H – for high engine speeds.
T – for idle speed.

Turn the low and high speed control screws clockwise to the limit, and after the peak is reached, turn them in the opposite direction, one and a half turns. When idling, the Husqvarna 142 chainsaw chain must be stationary. Check at maximum speed.

You can avoid most malfunctions and costly repairs by following the manufacturer’s instructions and recommendations, as well as using original spare parts for the Husqvarna 142 chainsaw.

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Algorithm and description of Husqvarna carburetor settings

The Husqvarna carburetor is adjusted in the same way as carburetors on chainsaws from other manufacturers are adjusted.

The order of work is as follows:

The factory-installed Husqvarna carburetor options are installed on the damped saw.
The engine is started and the saw is warmed up for several minutes.
By rotating the screw (L) clockwise, you find the position at which the engine develops the highest speed, after which the screw must be turned back 1⁄4. If at the same time the chainsaw chain is spinning, then you need to reduce the idle speed by adjusting the position of the screw (T).
The next step is to adjust the power of Husqvarna at the highest speeds and adjust their number. To do this, the tachometer is connected to a running chainsaw, the throttle is squeezed to full, after which the tachometer readings are checked. If the maximum speed value differs from the maximum number recommended by the manufacturer, then by adjusting the position of the screw (H) the tachometer readings are returned to normal.

Sources:

https://zemlyconsalt.ru/pily/kak-snyat-karbyurator-s-benzopily-huskvarna.html https://zemlyaselhoz.ru/pily/regulirovka-karbyuratora-pila-huskvarna-240.html

Carburetor tuning: main points

Reassembly of the carburetor is carried out only after complete cleaning, drying and blowing with compressed air. However, do not forget that some gaskets and seals, even if there is no damage, must be replaced.

You can begin adjusting the carburetor if it is correctly troubleshooted, of high quality assembly and flawless re-installation on the engine.

Principles of carburetor tuning:

screws H and L adjust the ratio of air and fuel mixture, i.e. throttle position. Tightening the screws clockwise leads to a lean mixture and the engine switches to low speeds. When unscrewing (counterclockwise), the mixture becomes richer and the engine speed increases;
screw T is responsible for adjusting the idle speed: turning it clockwise increases their number, counterclockwise - decreases it;
The screws are adjusted in LHT order.

Chainsaw carburetor calibration

The general adjustment algorithm looks something like this:

Initially, the highest idle speed is found by turning screw L and then returning ¼ turn counterclockwise. If the chain rotates at idle, turn screw T in the same direction until it stops completely.
With the engine warm and running at full speed, turn screw H ¼ turn to the left, then let the engine run for 10 seconds and check the maximum speed using a tachometer. It must correspond to the number indicated in the instrument passport.
After calibration with screws L and H, using screw T, the idle speed is adjusted. If everything is done correctly, the engine will operate evenly in all its positions.

Reminders for calibrating the carburetor on the chainsaw body

Upon completion of the adjustment, all that remains is to reinstall the chainsaw cover with the insulating gasket, after which you can begin the main work. If the settings are correct, the chainsaw engine will receive the optimal fuel mixture. This will ensure its normal efficiency, as well as overall comfort and safety of working with the tool.