Do-it-yourself sadko chainsaw repair

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

A chainsaw is a worthy replacement for hand saws and axes. Today, this tool is available in almost every household - it is indispensable for arranging a personal plot, construction and repair work. Intensive use and improper care of the tool can lead to premature tool failure. However, it is not at all necessary for the owner of a chainsaw to immediately contact the workshop - many of the malfunctions that can happen to it during operation can be eliminated on their own.

The main condition for a successful repair is the correct diagnosis. Therefore, in order to determine why the chainsaw failed and, most importantly, how to make it work again, you first need to know the features of its design.

It should be noted that it does not differ in particular complexity, since it includes:

engine (two-stroke gasoline);
functional part (saw bar and chain);
systems that ensure the joint operation of these two components (ignition, filtration, lubrication, etc.), that is, the tool as a whole.

In order to simplify the diagnosis of faults, it is customary to distinguish them into two main categories:

engine malfunctions;
malfunctions of other components of the chainsaw.

Most often, failures occur in engine systems, however, other parts of the tool, due to intensive use or improper care, can fail at any time. How to determine exactly where the breakdown occurred? Simple logic will help us with this.

If the problem is in the engine, it will:

Video (click to play).

do not start;
go deaf;
unsteady work;
overheat;
smoke;
develop insufficient power.

As for all other malfunctions, as a rule they manifest themselves with a normally running motor.

If the chainsaw won't start, the first thing to do is to check the fuel mixture in the tank. By the way, it must be prepared in the proportions specified by the engine manufacturer, otherwise the tool simply will not start.

After making sure that the fuel mixture is correct and available, the ignition system should be checked. To do this, inspect the spark plug.

Her condition can say a lot:

indicates that the fuel mixture does not enter the carburetor, which means that the problem is not in the ignition;

is the result of an excess of the fuel mixture, which lies either in a violation of the engine start algorithm, or in improper carburetor adjustment;

this is a signal about the presence of low-quality oil in the engine lubrication system, incorrect carburetor settings, or an incorrectly prepared fuel mixture.

If the spark plug is splashed with fuel, wipe it thoroughly after removing it. You should also clean the fuel supply system. To do this, it overlaps, after which the starter is turned on. A carbon-covered candle must be carefully cleaned with an awl and emery.

When checking candles, attention should be paid to the distance between the electrodes (the normal gap is 0.5-0.65 mm), as well as the condition of the gasket and the presence of a spark. A damaged or worn gasket will have to be replaced, and the spark can be checked by putting on the ignition cable, connecting the cylinder and spark plug nut, and cranking the starter.

If the discharge does not occur, the candle must be replaced. In the event that a spark does not appear with a new candle, then the problem is in the connection to the high-voltage wire or in itself.

If the fuel mixture does not enter the cylinder, but the spark plug is working properly, this may mean that:

The fuel filter is clogged.

To clean this assembly, remove the fuel hose and check the jet. If it is weak, the filter must be removed through the filler hole of the fuel tank and cleaned or replaced in case of complete wear.

As a preventive measure, it is recommended to replace the fuel filter at least once every 3 months.

This is nothing more than a hole in the fuel tank cap, which is cleaned with an awl.

The fuel mixture is not supplied or supplied in insufficient quantities.

There may be several reasons for this:

the air filter is clogged (in this case, it must be removed, rinsed with water, dried and put back in place);
the carburetor settings have gone astray (which means this assembly must be re-adjusted);
the integrity of the carburetor membrane is broken (it must be replaced);
the carburetor channels are clogged (it must be disassembled and cleaned of all parts and assemblies).

If the chainsaw motor works fine at low speeds, but starts to stall and smoke at high speeds, the problem may be hiding in the muffler.

To check the quality of its work, do the following:

dismantling (with obligatory closing of the outlet);
disassembly (if the muffler is collapsible);
cleaning from carbon deposits using special detergents or by dry method;
drying (using a hair dryer);
reassembly and installation.

Dry cleaning without respiratory protection is not recommended. The carcinogens present in soot will be released into the surrounding atmosphere in the form of dust, the inhalation of which is extremely dangerous to health.

To prevent clogging of the muffler during the operation of the chainsaw, you should carefully monitor the composition of the fuel mixture and the quality of its components.

If the chainsaw engine does not start or cannot develop normal power, it is likely that there is not enough pressure in the engine cylinder to burn the fuel mixture. The reason for this may be the wear of the elements of the cylinder-piston group - piston, rings, bearings, etc. In order to assess the condition of this assembly, it is necessary to conduct a visual inspection of it, after removing the muffler.

For a more complete diagnosis, a compression gauge is placed in the spark plug hole of a two-stroke chainsaw engine. It measures the compression in the engine. Based on the results of the check, one can judge the state of the CPG, however, accurate facts can only be obtained with a complete disassembly of the assembly.

If there are chips or scratches on the piston, it is obvious that it will have to be replaced. The same applies to deformed or broken piston rings - for normal engine operation, they must be fully functional and clean from carbon deposits.

A properly working carburetor guarantees maximum efficiency of the chainsaw, that is, it is possible to develop full power with the most economical consumption of the fuel mixture. The adjustment of this unit is usually carried out by the manufacturer, however, its design provides for the possibility of adjustment during operation.

The fact that such a setting will have to be performed by the owner of the chainsaw is evidenced by:

Strong vibrations or damage to the protective cap.
Depreciation of the CPG.
Carburetor blockage.
Inability to start the engine or its spontaneous stops after starting.
Increased fuel consumption and emissions while reducing engine power.

The chainsaw carburetor is adjusted in strict accordance with the manufacturer's instructions using three special screws that are responsible for the maximum ("M") and minimum ("L") revolutions, as well as idling the engine ("T").In order to exclude unwanted interference by an inexperienced user in the operation of the carburetor, some manufacturers install only one idle screw.

Carburetor adjustment is carried out in two stages:

Basic (carried out with the engine off).
Finishing (carried out with a running, preheated engine).

For basic adjustment it is necessary to tighten the screws H and L until they stop and turn them back 1.5 turns. Finishing adjustment requires that the engine be warmed up for 5-10 minutes at low speeds.

The final calibration is carried out by turning the idle screw until the minimum engine speed is reached (its operation must be stable and the chain must be stationary). If the engine stops idling, the screw must be turned back, and if the saw chain is still driven, continue to turn it counterclockwise.

Calibration check is done by test:

Accelerations (when you gently press the accelerator, the engine should quickly gain momentum to the maximum rate).
Maximum speed (if there is a misfire, screw H should be slightly loosened).
Idle operation (the chain should not move, and the engine should pick up speed as quickly as possible).

If the owner of the chainsaw is not familiar with the carburetor device and does not have the tool necessary to calibrate it, you should contact a specialist. The carburetor is a very complex unit, so any wrong action can lead to irreversible consequences, such as complete failure of the engine.

If the diagnostics showed that everything is in order with the engine and its systems, then the cause of the malfunction should be sought in other components of the chainsaw. The most common problems are:

starter failure;
improper operation of the lubrication system;
incorrect operation of the chain brake;
saw chain wear, etc.

If the cause of tool failure is not visible to the naked eye, as is the case with an engine, a thorough fault diagnosis must be made and corrected in accordance with the manufacturer's recommendations and safety regulations.

The chainsaw has become such a familiar and necessary tool in the hands of a skilled man that if it fails, we begin to feel uncomfortable. But the design of this unit is so simple that we can make almost any repair of its components ourselves. But what do you need and how do you repair a chainsaw with your own hands?

You need to have a very small set of tools for this:

a set of keys (including a special key for spark plugs);
chainsaw device diagram (usually it is included in the package).

You also cannot do without elementary knowledge from the course of physics. Add to this the ability to reason logically, and you are almost ready to repair a chainsaw.

We will start the repair with a "diagnosis" - the definition of a malfunction. First you need to unscrew the candle and carefully examine it. Possible problems are listed below.

Types of spark plugs for chainsaws.

The candle is wet. We draw a logical conclusion that the fuel mixture inside the combustion chamber does not ignite. The second reason could be water getting into the cylinder. In any case, you need to dry the candle, blow out the cylinder. We do the same steps as when winding a chainsaw. The only difference is that the fuel supply valve must be closed and the throttle valve fully open. After that, we put a cradle from the wire on the candle and check for a spark by pressing the candle against the cylinder body and trying to start the engine. If the spark is good, then the cause may be fuel - it needs to be replaced.If the spark does not appear or appears unevenly, then the cause of the malfunction should be sought in the ignition system. Perhaps there is a breakdown of the high-voltage wire or damage to the candle itself. It is enough to try to use a spare candle to make sure that the first candle can still be used. If the spare spark plug does not respond to the start test, then the ignition system should be more thoroughly examined.

The candle is dry, but heavily covered with soot. This fact indicates that the balance between fuel and oil is disturbed (too much oil!) Or one of the filters is clogged (fuel or air). Clogged filters lead first to a loss of power of the chainsaw, and then to a complete stop. Dust that gets inside the cylinder cannot burn out completely and settles on the inside of the cylinder in the form of a dense layer of soot.

Chainsaw fuel system: 1 - fuel filter, 2 - carburetor, 3 - manual pre-priming pump.

This drawback is eliminated as follows: the fuel is replaced, the fuel filter is cleaned (according to the instructions), the air filter is washed and dried. The candle itself is mechanically cleaned of soot with an awl, its contacts are cleaned with fine sandpaper.

The candle is dry and clean. Apparently no fuel is getting into the cylinder at all. The cause may be either a clogged conductive tube, or problems with the carburetor. It is necessary to clean the fuel line of the chainsaw and check the operation of the fuel pump and carburetor. Repair of these chainsaw components at home is almost impossible, so they are simply replaced.

Regarding the chainsaw carburetor, it is still necessary to clarify a few important points: manufacturers minimize the possibility of adjusting it, leaving access only to idle adjustment. But even such a small amount makes it possible to achieve maximum power from the chainsaw.

By properly adjusting the idle speed, you will notice that the engine has become more reliable.

But it is better to entrust the repair of the carburetor to the service specialists, since it can be done independently only if you have extensive experience and certain knowledge.

Scheme of a two-stroke chainsaw engine.

We will assume that you were able to do everything exactly and your chainsaw began to show signs of life, but there are problems with power. It happens very often that the engine runs well at idle, but the chain speed increases very slowly when the accelerator lever is pressed, or the chainsaw simply stalls. The problem may be that the hole for exhaust gases is clogged. It is not difficult to eliminate this shortcoming.

First you need to unscrew the muffler. The piston must be set to its highest position so that it blocks the channel and excludes the possibility of soot entering the cylinder. And now the soot must be carefully scraped off the walls. You can use both a screwdriver and a thin chisel for these purposes. When cleaning, we try not to make great efforts, as you can easily mechanically damage the cylinder or piston. After removing the plaque, we wipe the cleaned surface with diesel fuel or gasoline, and the muffler can already be screwed on. Before this, the non-separable muffler should be washed with diesel fuel or low-octane gasoline and dried. Removing soot will increase power.

It is possible that none of the home repair methods described have led to the desired result and the chainsaw is still not working. Most likely, you have a malfunction in the ignition system. It turns out that the fuel is supplied, and the spark on the candle is excellent, but the engine refuses to work.

We check the quality of the ignition adjustment as follows: turn off the spark plug, adjust the gap between the contacts (according to the technical data sheet of the product), connect it to the wire and press it against the cylinder body. And now we are observing the moment the spark appears: it should appear at the extreme upper position of the piston. Visually it is noticeable. If deviations exist, then you need to adjust the ignition. For different chainsaws, it is done in different ways, but in general, this process resembles the ignition adjustment in other two-stroke engines.Do-it-yourself chainsaw repair is also acceptable in case of problems with the chain brake. Usually it happens due to contamination of the surface with sawdust or lubricants. The wear of the braking band itself is also possible. Simply unscrew the side panel and clean it. If necessary, replace the tape. Image - Do-it-yourself sadko chainsaw repair

Scheme of electronic ignition of a chainsaw.

Repair of a chainsaw that has problems with the cylinder-piston part involves disassembling the motor and replacing worn parts. This is the most difficult repair, but also the rarest. In modern chainsaws, breakdowns of parts of this group are rare. And this usually happens due to the marriage of the components of the mechanism at the initial stage of operation. During this period, you have the opportunity to receive a chainsaw repair under a warranty card, so there is no need to do it yourself.

It should be noted that the main reasons that lead to the breakdown of chainsaws and their subsequent repair include violations of the operating rules provided by the manufacturer. First of all, this is a violation of the ratio of oil and gasoline in the fuel mixture. Very often, chainsaw users do not even suspect that the prepared fuel mixture under the influence of direct sunlight loses its properties. Fuel changes not only color, but also lubricating qualities. Certain particles do become technically harmful additives that can disrupt the fuel system of a chainsaw. This suggests the conclusion that an elementary observance of maintenance rules will allow to extend the trouble-free service life of almost all chainsaws.

A few words must be said about other rules that will avoid repairs for the longest possible time. First of all, you need to have several tires (at least two) and several chains (at least 4). After every 3 hours of operation, the tire should be rotated 180°. After another three hours, we also replace the chain. This approach will allow uniform wear of all parts of the saw, which will eliminate distortions and additional load.

It is constantly necessary to monitor the cleanliness of the entire mechanism and various openings. Clogged orifices can cause a vacuum plug to prevent fuel or oil from flowing freely to the necessary parts, causing the chainsaw to stop.You should start repairing chainsaws at home only when you have certain skills in carrying out such repairs. Otherwise, such work should be entrusted to specialists of the company's service. Their experience will allow you to quickly diagnose the chainsaw and repair it with high quality. Image - Do-it-yourself sadko chainsaw repair

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

We remove the plastic back cover - it rests on a latch or on a thread.

Dismantle the air filter.

Use a flathead screwdriver to pry off the air ducts and remove them. There can be two or three rods, depending on the model.

The carburetor is attached with two mounts - they are located diagonally. You need to open them.

Disconnect the gas hose that supplies fuel to the carburetor from the gas tank.

This Sadko chainsaw is intended for solving small household tasks - trimming branches, removing shrubs, sawing small logs and harvesting boards before further construction. The chainsaw has proven itself well when working in difficult weather conditions, its engine starts quite easily in cold weather, which was achieved by equipping the chainsaw with a system of elements for smoother start.

In addition, the Sadko chainsaw is equipped with a high-quality oil pump that supplies oil to the saw element only when the chain rotates on the bar. To prevent injury to the owner, the Sadko chainsaw is equipped with a special mechanism that effectively protects the operator's hands and face from damage by the chain during a reverse impact.

This model is the lightest and most compact chainsaw in the Sadko brand lineup. Due to its small dimensions and light weight, the saw is very easy to transport and work with it at height.

Other features of the chainsaw include:

Power of the motor of a saw - — 1,2 l. s./900 watts;
The recommended length of the tire used is 35 cm;
Saw chain pitch - 3/8";
The volume of the fuel tank is 230 ml;
Oil tank capacity - 160 ml;
Weight assembled for work - 3.3 kg.

To refuel the chainsaw, you should use gasoline of a grade not lower than AI-92 and oil for 2-stroke engines manufactured by Sadko.

This Sadko chainsaw is a high-quality and reliable garden tool that can cope with the tasks of sawing wood on the farm and in the forest. The distinctive features of the chainsaw include a convenient location of handles and switches, a fairly light weight in the complete assembly, the presence of all the options necessary for regular work in any conditions.

The Sadko chainsaw is equipped with a reliable inertial brake that prevents injury to the operator in the event of a kickback, an adjustable pump for supplying lubricant to the chain, a high-quality carburetor with an enlarged float chamber, and a reliable 2-stroke engine with an extended working life. Chainsaw design features include:

Saw motor power - 3 liters. s./2200 Watts;
The recommended length of the used tire is 45 cm;
Saw chain pitch - 0.325";
The capacity of the tank for supplying the fuel mixture is 550 ml;
The volume of the tank for chain lubrication is 260 ml;
Weight in a ready-to-use form - 6.6 kg.

This Sadko chainsaw comes complete with documentation, disassembly keys and accessories to protect the operator.

The Sadko chainsaw in this modification is a powerful professional tool that is successfully used not only in the garden and forest, but also in public utilities. A distinctive feature of this saw is the presence in its design of all the options necessary for comfortable work in difficult conditions.

The Sadko chainsaw device includes an effective system to facilitate starting the engine, a branded chain with a special anti-vibration design and an improved oil pump that can be adjusted depending on working conditions.

Features of the Sadko chainsaw include:

Saw motor power - 3.4 liters. s./2500 watts;
The tire length recommended by the manufacturer is 50 cm;
Saw chain pitch - 0.325";
The volume of the fuel supply tank is 550 ml;
Lubricant tank capacity - 260 ml;
Weight in a form ready for work - 6.9 kg.

It would seem, why would a summer resident who grows vegetables and fruits need a chainsaw, or an owner of a country house with a small garden and several flower beds? The question disappears when there is a desire to build a bathhouse, update a greenhouse, knock down an old business, or just make a bench for relaxing. Unfortunately, any mechanism periodically needs maintenance and replacement of spare parts, and for this you need to be well versed in the design of the product, in addition, repairing a chainsaw with your own hands will save time and money.All chainsaws are similar in structure, regardless of whether they are made in Europe (ECHO, Stihl, Husqvarna) or domestic (Kedr, Ural). The main elements are located inside the body - a fuel tank and an engine, and outside the starter, a handle, a saw part (tire) with a chain. A sharp jerk of the cable starts the engine, and that one starts the saw blade.To get started, we suggest that you familiarize yourself with the video clips that show how the chainsaw is arranged and how it works:From time to time, malfunctions occur in the operation of the saw, which require disassembly to eliminate. What can happen to such a simple mechanism as a chainsaw? At least the following:

Stops starting;

Starts, but soon stops;

Ceases to function in the cut;

Loses its power;

Most of the problems are associated either with interruptions in the operation of the engine (fuel supply system, exhaust system, ignition, cylinder-piston part), or with malfunctions of other systems and components (clutch, chain brake, tire, lubrication system). Consider the most common breakdowns and methods for their elimination.A serviceable chainsaw starts with one jerk and does not fail in cuttingThe first thing to do when a chainsaw breaks down is to inspect the spark plug by disconnecting the wire and carefully turning it out with a special key.Components of the chainsaw ignition system: 1 - flywheel with magnets, 2 - ignition module, 3 - candle, 4 - high voltage wire

The spark plug is unscrewed to check its condition.Her appearance says a lot:

Dry. Most likely, the fuel mixture does not enter the cylinder. It's not the ignition system, so the candle is twisted back.

Heavily splashed with fuel. The reason for the excess fuel mixture lies either in violation of the rules for starting, or in improper adjustment of the carburetor. The candle is thoroughly wiped, the fuel supply is turned off and the starter is turned on - to remove excess fuel and ventilate the combustion chamber. Then the candle is placed in place and the mechanism is started again.

Covered with black soot. This may indicate the use of low-quality oil, an incorrectly adjusted carburetor, or an incorrectly calculated ratio of gasoline and oil. The candle should be washed, cleaned of soot with a sharp object (awl or needle), wipe the electrodes with a sandpaper and place in place.

When checking the candle, you need to pay attention to the gap between the electrodes: from 0.5 to 0.65 mm is considered normal.A damaged or worn gasket must be replaced.A large amount of black soot on the spark plug indicates a malfunction in the engineTo be completely sure, you should also check for the presence of a spark. To do this, put an ignition cable on the spark plug, connect the spark plug nut and the cylinder with pliers, start the starter and watch for a spark. If it is missing, the spark plug needs to be replaced. If the new spark plug doesn't spark either, the problem is with the high-voltage wire or a loose connection to the spark plug.Fuel may not enter the cylinder for the following reasons:

Fuel filter dirty. Remove the fuel hose and check how the fuel flows. If the jet is weak, the filter may need to be cleaned. It is taken out through the filler hole of the fuel tank and cleaned; in case of severe contamination, it is replaced with a new one. As a preventive measure, it is recommended to replace the fuel filter every three months.

Clogged breather (holes in the fuel tank cap). They also check by disconnecting the hose, in case of blockage, clean with a needle.

No or insufficient fuel. There may be several reasons for the failure. The first reason is a clogged air filter. The air stops flowing into the carburetor in the right amount, in connection with this, due to an overly enriched fuel mixture, engine operation is disrupted. The dirty filter is carefully removed, cleaned and washed in water, then dried and replaced.

Another reason is the incorrect adjustment of the carburetor. Adjustment is made with three screws.Timely replacement of the fuel filter guarantees a full supply of fuelThe fuel hose and the air damper actuator must fit snugly against the fittingsThrottle lever cable must be in placeDuring operation, you must use the instructions, otherwise you can only make things worse.And the last reason is a violation of the integrity of the membrane or clogging of the carburetor channels.To repair the carburetor yourself, you need to get acquainted with all its detailsAll parts must be clean, dry and in good condition.If the engine runs fine at low speeds, but starts to stall at high speeds, the reason may lie in the muffler spark arrester, clogged with combustion products.

remove muffler;

disassemble (there are also non-separable models);

clean from soot using detergents;

dry with a hair dryer;

put in place.

Dry cleaning is unacceptable, as carbon deposits contain carcinogens, the inhalation of which is dangerous to health. After removing the muffler, cover the outlet with a clean cloth.Interruptions in the operation of the chainsaw signal a possible clogged mufflerTo prevent clogging of the muffler, it is necessary to monitor the composition of the fuel mixture. The amount of oil should not exceed the norms recommended by the manufacturer. Poor oil quality also negatively affects engine performance.Often the engine does not start or does not run at full capacity due to low cylinder pressure. It can be caused by worn pistons or cylinders, slipped piston rings, or worn bearings. You can partially examine the state of the cylinder-piston group (CPG) by removing the muffler and looking into the opened hole.A compression gauge placed in the spark plug hole will help measure the compression in the engine - based on the results of the measurement, one can also talk about the state of the CPG. Accurate data is obtained only after the complete disassembly of the mechanism. If the piston has chips or scratches, it must be replaced. The piston ring must be clean, free of carbon deposits, and in exactly the right place.Wear of the piston and crank mechanism is considered a serious problemBased on the results of measuring compression, one can judge the condition of parts of the CPGConsider three main faults:

Oil leakage.It should be checked whether the tubes are hermetically attached to the pump fittings and whether they are cracked. Problematic tubes are sealed with sealant or changed.

Insufficient oil supply. Most likely, the lubrication channels are clogged.

The occurrence of cracks in the oil pump housing. A part needs to be replaced.

Here is how the lubrication system is diagnosed:The chain brake often does not work due to grease or sawdust clogging the brake band and the space under the cover. All parts must be cleared of blockages. Perhaps the tape is simply worn out, then it needs to be replaced.The operation of the chain brake is restored by mechanical cleaning

Video (click to play).

Some chainsaw parts wear out faster than others. These include the drive sprocket, tire, chain, anti-vibration elements. For quick replacement of spare parts, it is better to always have at hand. Do not neglect the sharpening of the chain.