DIY Husqvarna 142 chainsaw carburetor repair

A chainsaw is needed in construction, and in gardening, and in landscaping - its presence greatly simplifies the implementation of a number of tasks for processing wood. The main unit of this tool is the engine, the operation of which largely depends on the state and settings of the carburetor. This is where the fuel mixture is prepared. This means that if the saw does not start, stalls or does not provide the required power, it is likely that the reason for this is improper operation of the carburetor. Fortunately, you can handle this yourself in many cases. Only for this you need to know and understand the device and principle of operation of this unit and, of course, the chainsaw itself.

The main purpose of the carburetor is to mix fuel with air in the required proportions. If the latter are violated, this is almost instantly reflected in the operation of the engine.

Stihl MS 181 C BE chainsaw carburetor

Chainsaw carburetors may vary in design. However, their basic elements and the principle of operation remain approximately the same.

Carburetor device:

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

This part is located where the base tube is narrowed - here the air flow rate increases, i.e. air is always supplied to the carburetor under some pressure.

In this area, the fuel comes into contact with the air stream. Fuel enters the atomizer from the float chamber through the nozzle (metering device).

1. Float chamber

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

Structural diagram of a chainsaw carburetor

The chainsaw carburetor works according to the following principle:

• when the engine is started, the main flap opens and a stream of air is supplied into the air channel at a certain speed;
• the air flow rate, as well as the level of the float in the chamber, are regulated by the position of the damper, namely, due to the difference in pressure in the float chamber and the air channel;
• the 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 there;
• the resulting mixture is fed into the cylinder chambers through the inlet channels.

The pressure in the float chamber is approximately equal to atmospheric, but in the air channels of the carburetor, when the engine of the chainsaw is started, a vacuum occurs. Opening the damper increases the air flow rate. As a result, more fuel flows into the carburetor, and the number of revolutions of the engine shaft increases.

In the first hours of operation, the 2-stroke engine of the chainsaw requires running-in, on which the quality of its further work depends. During the running-in process, the primary adjustment of the carburetor is performed - the optimal parameters for the preparation and supply of the fuel mixture are set.

Chainsaw initial break-in: working with thin material

Most modern chainsaws are sold adjusted. Nevertheless, the quality of the factory settings does not interfere with checking - in the end, you will have to work with the instrument.

The first time you start the chainsaw, it must be gentle. Therefore, for several hours after the start, it is recommended not to overload the engine and only cut small branches and trunks up to 10 cm thick.

To insure against malfunctions in the carburetor of the chainsaw, simple rules will help:

1. Always mix gasoline and oil in accordance with the manufacturer's numbers. The proportions of the fuel mixture for the chainsaw engine
2. Do not prepare the fuel mixture in advance - the properties of gasoline and oil when mixed will lose over time. An exception is fuel for an intensively used tool, however, here, one should not exceed the approximately weekly rate.
3. Use the oil specified for your chainsaw engine. A fuel mixture with a non-standard composition will disable it seriously and for a long time.
4. When preparing the fuel mixture, take into account the influence of climatic conditions on its components.

The chainsaw must start correctly, provide a stable sprocket speed and smooth power increase / decrease. When the engine is running, there should be no extraneous knocks, pops and noises.

Professional hand-held 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 go out, "sneeze", smoke and work in jerks.

Typical carburetor malfunctions are easy to recognize. They are expressed in the fact that the engine of the chainsaw starts up and immediately stalls or does not show signs of life at all. Well, or it consumes fuel with might and main, producing clouds of black smoke and aggressive vibrations instead of the required power.

Chainsaw carburetor operation diagram

Carburetor settings can be affected by:

• lack of fixing the adjusting screws; Chainsaw adjusting screws
• wear of the piston group; New CPG chainsaw Husqvarna 365
• blockage of the fuel-air channels;
• damage to air filters; Chainsaw air filter with nylon insert
• poor quality gasoline or oil.

If any problems are found, they should be rectified immediately. But how do you know if the carburetor is the problem? To do this, watch how your tool works.

Typical signs that carburetor settings are out of order include:

1. Unstable motor operation

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

1. Excessive consumption of fuel

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

Carburetor set correctly - saw starts the first time

1. Arbitrary changes in engine power

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

1. Increased fuel consumption accompanied by vibrations and pops

It speaks of critical wear of the piston group, therefore, adjusting the carburetor will postpone the overhaul only for a while.

1. "Sneezing" and engine jerking

This picture is observed when the carburetor channels are clogged or its filters are malfunctioning. In this case, adjustments should only be made after thorough flushing of the assembly.

Chainsaw fuel filter

Despite the fact that the carburetor is the most difficult part of the engine, you should not be upset if it detects malfunctions in its operation. Instead, you need to arm yourself with some tool, a knot design, and some healthy logic.

Chainsaw carburetor being repaired

First of all, you need to prepare a place for disassembly. This can be a workbench or a regular table. In addition, you need a rectangular piece of cloth or cardboard - on it you will neatly fold the carburetor parts. And, finally, a tool: for disassembly, you will need a set of open-end wrenches and screwdrivers, a special cleaning compound and an ultrasonic cavitation bath.

Chainsaw carburetor repair tool

First, you have to dismantle the chainsaw carburetor. This is done in this order:

1. To get to the carburetor, you need to remove the top cover of the chainsaw, which is fixed with three bolts. Removing the carburetor cover
2. After removing the cover, do not forget to remove the gasket, which is an integral part of the air filter, and the body of the latter, for which you need to unscrew the corresponding nuts and / or remove it from the clips.
3. On the right side of the carburetor there is a fuel hose, it must be removed together with the air damper drive rod, not forgetting to pull it off the fitting on the left. Removing the fuel hose and drive rod
4. After removing the hose and rod, remove the throttle cable tip from the fixing socket and finally dismantle the gasoline hose. Removing the throttle cable
5. The carburetor can then be removed from the mountings for later disassembly. After removing the gasoline hose, the carburetor is ready for disassembly.

Disassembly of the carburetor must be carried out in the manner prescribed by the design and functional solutions of its elements. Chainsaw carburetor parts do not differ in size, so they need to be folded carefully and in order, trying not to lose anything.

After disassembly, it is necessary to carry out troubleshooting and replace damaged or worn parts. Next, the entire set should be rinsed with a special product, dried and wiped with a dry, lint-free cloth. The jets and tubes of the assembly must be blown out with compressed air, or, in order to more thoroughly remove the formations on their inner surfaces, they must be treated with ultrasound before that.

Reassembly of the carburetor is carried out only after complete cleaning, drying and blowing with compressed air. At the same time, do not forget that some gaskets and seals, even if they are not damaged, must be replaced.

You can start adjusting the carburetor provided it is correctly troubleshooting, high-quality assembly and flawless re-installation on the engine.

Carburetor setting principles:

• screws H and L adjust the ratio of air and combustible mixture, i.e. throttle position. Tightening the screws clockwise leads to a depletion of the mixture and the transition of the engine to low revs. When unscrewing (counterclockwise), the mixture is enriched, and the engine speed increases;
• screw T is responsible for adjusting the idle speed: turning it clockwise gives an increase in their number, against - a decrease;
• screws are adjusted in L-H-T order. Chainsaw Carburetor Calibration

The general adjustment algorithm looks like this:

1. Initially, the highest idle speed is found by turning the screw L and then returning it by ¼ turn counterclockwise. If the chain rotates at idle speed, turn the screw T in the same direction until it comes to a complete stop.
2. With the engine warm, running at full speed, turn the screw H by ¼ of a turn to the left, then let the engine run for 10 s to check the maximum speed using a tachometer. It must correspond to the number indicated in the instrument's passport.
3. After the calibration with screws L and H, the idle speed is adjusted with screw T. If done correctly, the engine will run evenly in all positions. Memo for calibrating the carburetor on the body of the chainsaw

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

The carburetor is one of the important mechanical components that make up a chainsaw. Its tasks are mixing fuel with air and supplying the resulting composition to the engine. But during the operation of the chainsaw, situations occur when Husqvarna carburetor adjustment becomes necessary. Depending on the reasons, the carburetor adjustment of the 142 chainsaw model and other series is performed to prevent the following situations:

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

Since the carburetor affects the quality of the fuel, in the first case, the need to adjust the carburetor of the saws 137 or other professional series, like the Husqvarna 240 or 260, implies the effect on a sufficient amount of combustible raw materials entering the carburetor for mixing with the air mass. It is known that maximum productivity is possible only with a certain ratio of these substances. The second moment of adjusting the carburetor mixer of the chainsaw is caused by a lack of incoming air, which provokes the unburning of the injected gasoline with its output in the form of thick smoke. A timely change of parameters with your own hands to reduce the amount of injected fuel will significantly reduce the consumption of this product much faster.

Do-it-yourself repairs will save not only the budget, but also the time spent on transportation and the queue at the workshop. The same applies to the replacement of various spare parts in gasoline-powered tools, such as a chain for a chainsaw or a universal trimmer head for a brushcutter, or oils for electric drive products.

Neglecting deviations in the normal operation of the gasoline tool is fraught with the fact that even with a strong desire adjusting the carburetor of the Husqvarna chainsaw it may be useless and it will be necessary to replace either this unit or already the engine elements that have suffered from prolonged thermal or mechanical stress. Therefore, as soon as the saw shows the first deviations, repairs should be made immediately in the form of simple adjusting actions. Among such changes in the work, we note:

1. Chainsaw accelerates too slowly;
2. The tool does not reach the maximum power, and under load it quickly drops;
3. The motor often stalls;
4. There is a lot of noise in the chain saw;
5. The chainsaw releases an unusual amount of smoke that increases with each load step.

As soon as you notice any of the listed deviations, the carburetor of the 435 scythe or a slightly reinforced copy of the Husqvarna 55 saw should be urgently adjusted. Timely maintenance also foreshadows the absence of waste on the complete replacement of spare parts and blocks of the drive and fuel system of the chainsaw motor. Therefore, with difficulties in the operation of the carburetor system of the Husqvarna 340 and all other lines, the settings will save the chainsaw, and the work processes, and the owners' funds. If necessary, in the company "Kosa-Motors" you can order the infusion of mechanisms, replacement of spare parts, as well as buy a line for a trimmer with advice on its self-installation.

In all gasoline saws Husqvarna carburetor adjustment occurs in a similar order, since all products have the same set of mechanisms. For example, if the systems are tuned in the 236 series of gasoline-powered tools, the process is accompanied by the search for the highest idle speed by slowly turning the adjusting screws L - affecting the low speed jet, T - on the high speed jet and H - idle speed adjustment. The DIY adjustment process consists of several periods, involving turning the L and H screws that control the throttle valve for supplying the fuel mixture and adjusting the screw T, which adjusts the idle speed. Depending on the entered parameter, the saw adjustment is performed in the following sequence:

1. After warming up, the L screw is turned to the highest idle speed. As soon as those are found, turn in the direction of decreasing the rotation speed by ¼ turn of the screw. If the chain starts to rotate, an accompanying adjustment of the screw T against the clock is carried out until the chain stops.
2. Adjustment of the H screw on the chain saw carburetor takes place at a 10-second period of engine operation at full speed, after ¼ turn.If the maximum load is not reached, the operation is repeated. Insufficient tuning will cause the saw to squeal, while exaggerating settings will cause the muffler to blow out more smoke.
3. Adjustment T of the idle screw is carried out in turns according to the clock until the moment the chain starts rotating. As soon as this happens, the screw is tightened back until this mechanism stops.

Of course, making carburetor settings will allow your tool to work as efficiently as possible, but do not forget about lubrication. "Kosa Motors" recommends buying special-purpose chainsaw oil for mechanisms, since timely maintenance will give the tool an additional high-quality service life.

Despite the fact that electric and chainsaws are used to cut wood, they are designed for different jobs and working conditions.

Chainsaws are very powerful and efficient tools that you can use when it comes to handling trees and wood for lumber or firewood. But in order for them to work properly

Slim and sleek body, excellent power-to-weight ratio, and some of the best vibration ratings of any saw on the market. The economy pump stops supplying lubricant to the chain when the saw is idling.

The carburetor has three adjusting screws:
L - low speed jet screw
H - high speed jet screw
T - idle speed adjustment screw
echo3500 adjusting screws

Using the screws H and L, the ratio of the fuel-lubricant mixture and air is adjusted by opening the throttle valve. When the screws are tightened (clockwise), the mixture becomes leaner - low revolutions, when the screws are unscrewed (counterclockwise), the mixture is enriched, the revolutions increase.

Screw T adjusts idle speed. Turning clockwise increases the number of revolutions, counterclockwise decreases.

The basic carburetor setting is made at the factory during the saw test. The carburetor is adjusted for a richer than optimum mixture. This adjustment should be maintained during the first hours of saw operation. Then the carburetor is fine-tuned.

When turning the chain at idle speed, turn the screw T counterclockwise until the chain stops.

Fine adjustment of the carburetor can only be carried out in a warm state by specialists with special equipment (revolution counter).

The L screw is adjusted first, then the H and finally the T screw.

First you need to find the highest idle speed by slowly turning screw L clockwise (or counterclockwise). After finding the position of the highest revolutions, turn the screw L 1/4 turn counterclockwise. If the chain rotates at idle speed, turn screw T clockwise until the chain stops.

Adjusting screw H affects power and rpm. Lean carburetor adjustment will result in excessive revs and saw failure.

After warming up the engine at full speed for 10 seconds, turn the screw H by 1/4 turn counterclockwise. Let the engine run for about 10 seconds. Check the maximum speed with a tachometer. Repeat the operation if the maximum speed does not correspond to the passport one. The engine should sound like a four-stroke. The saw squeals when the mixture is too lean. When the carburetor is adjusted to a too rich mixture, the muffler begins to smoke.

For optimal adjustment, you must contact a specialist with access to the tachometer.
Fine adjustment of the idle speed with the T screw is carried out after adjusting the L and H screws.
If it is necessary to adjust the idle speed, with the engine running, the screw T must be turned clockwise until the saw chain starts to rotate.Then you need to turn the screw back counterclockwise until the chain stops rotating. The idle speed is set correctly if the engine runs evenly in all positions with sufficient reserve of revolutions when the chain starts to rotate.

The carburetor is properly adjusted if the engine accelerates immediately and noises like a full throttle four stroke. Adjusting the screw L to a too lean mixture will result in difficult starting and poor acceleration of the engine.

A carburetor is a device that has the following functions: mixing gasoline and air, creating a combustible mixture for powering the engine and regulating its consumption. Parts of the Husqvarna carburetor are made by casting from various alloys with further mechanical finishing. This ensures the high quality of Husqvarna carburetors, as you can see by purchasing this spare part from the 220 Volt store. It is an integral part of many tools among garden petrol equipment, for example, chainsaws, brushcutters, lawn mowers. In a number of situations, for example, with poor fuel filtration, the carburetor may fail. Fortunately, this will not be a reason to spend money on a new tool, because you can buy the carburetor separately (both normal and complete).

A carburetor is a device that is designed to prepare a combustible mixture of liquid fuel and air, which ensures the operation of carburetor internal combustion engines.

Modern carburetors are equipped with many different devices and systems, which have numerous holes of different calibers, an extensive network of channels, pneumatic chambers and linkages.

The carburetor is one of the main parts of any fuel-powered equipment. To ensure the normal and stable operation of the equipment, it is necessary to periodically check and, if necessary, adjust the carburetor.

Chainsaw carburetors have three adjustment screws. Screw "L" is designed to regulate low speed, screw "H" is responsible for regulating high speed, and screw "T" - for idling of the chainsaw. So, screws "H" and "L" adjust the ratio of the mixture of air and gasoline, when the screws are unscrewed, the speed increases, since the mixture is enriched, and when tightened, the speed falls.

Generator carburetors often have only one adjusting screw, but many other modifications of this part are also possible. Its adjustment allows you to exclude excessive fuel consumption and leakage of unburned oil.

However, there are quite common cases when adjusting the carburetor cannot fix the malfunctioning of the equipment. This is due to the final breakdown of the part, which occurs as a result of natural wear and tear or due to improper operation.

You can buy a new part for your equipment in our online store. Here you can buy carburetors for brushcutters, chainsaws, gas cutters, diesel and gasoline generators, as well as carburetors for blowers and many other equipment.

A versatile, multi-purpose saw for part-time use. Slim and sleek body, excellent power-to-weight ratio, and some of the best vibration ratings of any saw on the market. The economy pump stops supplying lubricant to the chain when the saw is idling. Easy Start System - A new spring-loaded starter mechanism and fuel pump that reduce the amount of jerk required to start.

Spiked bumper is not included in the scope of delivery

Specifications:

Air injection
Air injection Centrifugal air cleaning system for long filter cleaning intervals, smooth operation and reduced wear.
Easier to start
Combined adjuster / stop makes it easy to start the saw.
Ease of operation
The narrow body, high center of gravity and flat bottom make our saws extremely easy to use.
The principle of two masses
Vibration absorption system and handles isolated from the motor by steel springs. Independent anti-vibration system.
Uninterrupted operation
A damping clutch reduces vibration in the carburetor. Ensures smooth operation and prolongs service life.
Three-piece crankshaft
Forged three-piece crankshaft designed to maximize service life for the toughest applications.

Better grip
Curved front handle for better grip and natural working posture.

Economical pump
The economical pump stops lubrication at idle speed.

Fast acceleration
The light weight of all moving parts of the motor means fast acceleration.

Easy cleaning
A bayonet-type air filter makes it easy to remove the filter for cleaning.

Safe to use
Double-acting chain brake, right-hand guard and chain stop increase safety when using the saw.

Chainsaw carburetor GOOD LUK GL45
120 hry.

Chainsaw carburetor Rebir 1.4
UAH 200

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

Like any mechanism, it requires periodic maintenance and adjustment. Especially because of poor quality fuel. Consider the principles and procedure for adjusting the carburetor of the Husqvarna chainsaw.

The carburetor is used to prepare a combustible mixture in a ratio determined by the operator from gasoline and air.

An excessively rich mixture, as well as an excessively lean mixture, will lead to unstable engine operation, can cause overheating and accelerate the wear of the piston system.

The correct functioning of the device depends on the correct setting and adjustment.

And for this you need to know the principles of the Husqvarna chainsaw carburetor.

Its design consists of the following elements:

• body 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 supply of a combustible mixture to the engine;
• float chamber - fuel is collected in it, the level is regulated by the float, as necessary, the mixture is fed into the main chamber for mixing with air;
• the main chamber - air passes through it, and fuel is injected there, the amount of mixture supplied to the engine is regulated by the throttle valve located here;
• diffuser - a section of narrowing of the air supply tube at the place of fuel injection;
• needle valve - a device that regulates the fuel supply;
• jet - screws that regulate the supply of the 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 from the air filter. It artificially reduces the air supply, making the mixture richer for easier cold starting.

The injector valve is responsible for fuel injection into the main chamber, it also prevents air from entering. When adjusting the carburetor on a Husqvarna chainsaw, special attention should be paid to this valve, since its condition has a direct effect on the operation of the engine. Long-term storage may cause the nozzle to stick. This will restrict fuel flow and prevent the engine from starting.

Also, from prolonged use or due to a factory defect, the valve can let air into the main chamber. In this case, only replacing it will help fix the problem.

The carburetor works as follows: the air flow entering the diffuser is mixed with the injected fuel, the resulting mixture is fed into the engine. The amount of the mixture is regulated by the throttle valve. The more mixture, the higher the engine speed.

The need to adjust the carburetor of a chainsaw is rare. More often there are problems with the flow of fuel, air or wear of parts. But sometimes adjustment is still required:

• a running engine stalls after a few seconds, or it does not start - the reason for this is a too rich mixture;
• excessive exhaust, high revs, increased consumption - in this case, on the contrary, the mixture is too lean, that is, there is not enough air;
• RPM is kept at the same level after its decrease or increase by the operator - the cause may be a stuck needle valve.

The factors leading to such changes can be the following:

1. Strong vibration will damage the protective cover and the adjusting jets are unscrewed, changing the setting. In this case, it is possible to adjust the carburetor on the chainsaw.
2. Wear of elements of the piston system. Adjusting the carburetor in such a situation can be of temporary help. Replacement of worn-out components is recommended.
3. Poor quality fuel, faulty filter, or long storage can cause blockages. In this situation, the carburetor must be removed, rinsed with a special liquid or clean gasoline, assembled and re-adjusted.

It is best to start tuning the saw by checking the jets, fuel and air supply. After that, proceed to dismantle the carburetor, and then - to check the piston system.

First of all, you need to prepare a tool for adjusting the chainsaw carburetor. You will need a set of screwdrivers and open-end wrenches, a special cleaning compound that dissolves carbon deposits and debris.

Disassembly is best done on a table or workbench. On a part of the table, lay a flap of clean, preferably light and monochromatic fabric, on which the parts to be removed and a container for washing will be laid out. It is optimal if it is an ultrasonic bath.

In the event that the chainsaw does not develop speed or, on the contrary, works at too high, the carburetor can be adjusted without removing it.

But if the chainsaw does not start, the rpm freezes at the same level or it is unstable. Chainsaw carburetor tuning will not change the situation. It must be removed to clean or replace parts. In this case, it is necessary to act in the following order:

1. After unscrewing the retaining fasteners, remove the upper saw casing.
2. Remove the gasket and part of the air filter by unscrewing the bolts or unscrewing the fasteners.
3. There is a fuel hose on the right side of the carburetor. We remove it together with the air damper control rod.
4. Remove the carburetor from the mountings that hold it.

Disassembly of the carburetor is carried out in accordance with the instructions supplied with the kit. When disassembling, be very careful when folding the parts onto the prepared fabric. Due to its small size, there is a risk of losing components during disassembly and flushing.

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

Channels, tubes and nozzles are blown out with compressed air, if possible, after rinsing them in an ultrasonic bath.

For this, the device has 3 adjusting nozzles. The idle speed screw (T) is located on the top of the carburetor. Below there is a pair of jets for adjusting the fuel supply at minimum (L) and maximum (H) rpm, left and right, respectively.

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

1. We warm up for 5 minutes.
2. Turning screw L, we bring the engine to the highest speed in an unloaded state and return it back a quarter of a turn.
3. Hold the gas button with one hand for 15 seconds. At this time, we turn the H jet to the right until it stops and reaching the maximum speed. Then we turn it back one and a half turns, or until the "squeal" of the engine disappears.
4. After releasing the throttle, turn the idle screw (T) clockwise until the chain starts to move.After that, 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 excessively twisted jets, too rich or poor mixture.

If this happens, it is necessary to tighten the jets of the minimum and maximum speed until they stop. Then turn them back one and a half turns and try to start the saw.

If cleaning and adjusting the carburetor did not correct the existing problem, you need to check the spark plug and tune the engine. It is worth acting in the following order:

1. The candle is unscrewed and a visual inspection is carried out. If it is dry with a light brown carbon deposit, it can be considered intact.
2. If traces of gasoline are found on the spark plug, readjust the carburetor. This is because it supplies an excess amount of fuel to the internal combustion engine, filling it.
3. If the candle looks normal, check the electrical equipment. First of all, the cable that supplies current to the candle. The end of it is brought a short distance to the radiator grille of the cylinder and the starter is turned with a cord. A spark should slip through. If not, the cable is checked with a tester and, if necessary, replaced.
4. If the cable is in good condition, the ignition coil is tested. If the inspection does not reveal singed or broken wires, the coil is called with a tester, comparing the data with the accompanying documentation. If deviations are found, the block must be replaced with a similar one.

After replacing the coil unit, the magneto gap should be set. The gap between the ignition coil and the flywheel should be between 0.2 and 0.4 mm. To set the gap, you need a set of probes 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.

After setting up, you need to start the chainsaw. Check the stability of idling. In this case, the chain must not move. When you press the accelerator, the chainsaw should accelerate steadily and stop without delay.