Malfunctions of the Husqvarna 137 chainsaw

One of the most unpleasant phenomena is when you are about to cut down a tree, but the chainsaw does not start. Many people encounter this phenomenon, not only owners of cheap Chinese chainsaws, but also branded professional tools. If you are faced with a situation where the chainsaw engine does not start, then do not rush to return the tool for repair. Simple preventive actions will help quickly restore the functionality of the instrument. The procedure for carrying out preventive measures to restore the functionality of the gasoline unit is described in the material.

The main reasons why a chainsaw won’t start

When a chainsaw does not start, the search for the cause should begin with diagnostic procedures. To carry them out, it is not at all necessary to understand the structure of gas-powered tools, and it is enough to follow the sequence of actions. Common reasons why a chainsaw will not start are as follows:

1. Fuel line malfunction.
   From the tank, fuel in the form of gasoline and oil flows through the fuel line into the carburetor. The carburetor membrane, which acts as a pump, is responsible for its transportation. If there is no fuel in the tank, then naturally the chainsaw will not start, so first of all, make sure that there is fuel in the gas tank
2. Ignition system - most often, when a chainsaw engine does not start, the spark plug is to blame.
   This is due to the fact that it has a certain resource, and if the tool is used frequently and for a long time, the spark plug fails. After making sure that there is fuel in the tank, you need to check the serviceability of the spark plug
3. Filter elements are fuel and air cleaners that prevent small grains of sand from entering the carburetor and cylinder.
   The fuel filter cleans the fuel, and it is located on the fuel supply line in the gas tank. The air cleaner is located on the carburetor and limits the entry of chips and sawdust into the carburetor.
4. The breather or pressure equalizer is the smallest element, which is often the main reason that the chainsaw does not start.
   The main sign of a malfunctioning breather is when the engine stalls during operation.
5. Muffler or exhaust channel - during the operation of the tool, carbon deposits on the walls of the exhaust system.
   As a result, the exhaust gases have nowhere to go, and therefore the chainsaw does not start, and if it starts, it immediately stalls
6. The carburetor is a more serious malfunction, which can be eliminated by cleaning the device responsible for mixing fuel with air and supplying the finished mixture to the cylinder.
   Clogging of the carburetor channels and jets leads to the engine not starting.
7. CPG is the most extreme reason why a chainsaw will not start.
   A compression gauge will help verify the wear of the cylinder-piston group. By measuring the compression of the chainsaw, you can make a corresponding conclusion about the health of the engine itself.

These are all the components that need to be checked in order to find and eliminate the reason for the inability to start the chainsaw engine. We will consider each type of malfunction in more detail, as well as how to eliminate them, below.

Chainsaw Husqvarna starts up poorly

Forester Income from waste

Why does a chainsaw have trouble starting?

No matter what kind of saw you purchased from an official representative and entered the Russian market using the official method, it must have an annotation in Russian. We strongly advise you to familiarize yourself with it before you start using a chainsaw.

The chainsaw won’t start, what should I do? Let's start in order. No matter what kind of saw you purchased from an official representative and entered the Russian market using the official method, it must have an annotation in Russian. To avoid subsequent questions “why the chainsaw won’t start,” we strongly advise you to read the instructions before you start using the chainsaw.

Before starting the chainsaw, you must definitely install and adjust the saw set (bar, chain and sprocket), otherwise the saw’s clutch will immediately fall out and, accordingly, the clutch will fall out. The chainsaw won't start.

After the mandatory pre-start check and filling with fuel and oil, the saw is ready for use. Next, you need to remove the choke, remove one hundred percent of the slack in the starting cable and start the tool with a strong jump of the starter (with sluggish tension, there is a high risk of flooding the spark plug, which will somewhat complicate the next starting tests). If everything is done correctly, the saw starts the first time. If this does not happen, read the answer to the question why the chainsaw does not start .

READ Husqvarna Chainsaw Won't Start

The chainsaw does not start or does not start well. Reason and how to fix it.

Why won't my chainsaw start

.Cause.How to eliminate.

Why won't my chainsaw start? Tips from a mechanic for repairing gasoline powered tools 0

Video about the carburetor.

Your chainsaw or brush cutter won't start?

Famous case. This article will try to shed light on such an important process of starting a gas-powered tool.

A little about the fuel mixture. There is no need to save money here. You must understand that the cost of repairing a cylinder-piston group can be 2/3 of the cost of the tool itself. Perhaps a compelling argument for buying a fuel additive from a well-known brand, for example, STIHL, Husqvarna or Oregon, and 92nd gasoline at a gas station with a good reputation.

Starting a cold engine after storage for 2 days or more or after purchase in a store. When you purchase gas equipment from the right store, they can tell you everything in detail about the startup and operation of the gas tool, and they will also demonstrate it in practice. If this was not the case, it means it was a hypermarket or you were served by yesterday’s schoolboy or student. Our congratulations!

And finally, some gas-powered tools have a regular key switch for the ignition, just look to see if it is turned on.

READ Chainsaw Husqvarna 365 XP Video

A new chainsaw or gas trimmer (motor cutter) may not start. If you pump fuel, trying to start it from a cold start, then from a hot start. Cool down! Open the carburetor damper to operate during a “hot start”, and start the equipment while holding the fuel trigger to the maximum, and when starting, try to reduce the speed to a level just above idle in order to warm up the engine of the tool. Usually 30-45 seconds is enough to warm up.

Fuel filter in the tank. We need to check its functionality. But don't leave the inlet pipe without a filter.

Is there fuel in the tank and what is its quality?

Checking the presence of fuel in the tank is the first place to start diagnosing. Even if there is visually still fuel in the tank, make sure that the fuel line is lowered into it. If the fuel in the tank is low, then this is the main reason why it is impossible to start the engine. After adding fuel to the tank, it is necessary to bleed the system, and only after that carry out a test run of the engine.

If there is enough fuel in the tank, make sure that the supply hose inside the tank is not disconnected. On some models of chainsaws, such a malfunction is a “disease”. If the tank is full, this does not mean that the breakdown is not related to the fuel system. Check the quality of the fuel (oil and gasoline). Gasoline for chainsaws is mainly used of the AI-92 grade. As an oil, you need to use only a special two-stroke oil, but not motor oil or even waste oil.

The prepared fuel mixture cannot be stored for more than 2 weeks, as the mixture begins to lose its properties, which negatively affects not only the operation of the engine, but also its starting. How does a poor-quality mixture affect engine starting, you ask? Everything is very simple, when the mixture is stored for a long time, oil precipitates, which leads to clogging of the carburetor channels and jets.

The instructions for each brand of chainsaw indicate recommendations on the ratio of gasoline to oil. This is the recommendation that should be followed when preparing a mixture for a two-stroke chainsaw engine, otherwise it will significantly shorten the service life of your tool.

This is interesting!
You can tell the quality of the fuel by the color of the carbon deposits on the spark plugs.

Why the chainsaw won’t start - reasons and solutions

Each model has its own weaknesses. Some saws require regular carburetor adjustments. The disadvantage of others is the chain lubrication system. Be that as it may, any breakdown can be fixed with your own hands if you figure out what its cause is and what its signs are.

What to do if the chainsaw stalls when you press the gas?

As a rule, owners of chainsaws begin to encounter this breakdown after the first 6 months of intensive use of the tool. There may be several reasons for this malfunction.

Their list includes:

• using a fuel mixture prepared in the wrong proportion. If you regularly pour low-quality gasoline into the tank of a chainsaw, in which too much or too little oil is mixed, the tool will not start. In this case, you will need to drain the fuel and also dry the engine cylinder. To do this, you need to sharply pull the starter cable several times. After this, you need to fill in properly prepared fuel and start the saw engine;
• Filling the spark plug with oil when starting the engine. This problem can be solved by removing, cleaning and drying the candle. After 30 minutes, the candle will dry and you can screw it in. After this you will need to start the chainsaw;
• no spark. This indicates poor contact between the factory high-voltage wire and the spark plug tip. If the contact is not broken, but there is still no spark, then you need to check the electronic unit of the chainsaw’s ignition system. This element cannot be repaired, so it will need to be completely replaced;
• air filter clogged. This element of the saw must be regularly cleaned of debris, small insects and dust. Otherwise, air will not enter the carburetor, where it should enrich the fuel mixture. As a result, the saw will stop starting. To solve the problem, you will need to clean the filter or replace it.

In most cases, a chainsaw stops starting due to the use of low-quality fuel and motor oil. There is no need to skimp on working fluids, as this will lead to complex and time-consuming repairs.

Checking the spark on the spark plug and the gap between the coil and the magneto

The spark plug is the most important part that is responsible for igniting the fuel mixture supplied to the cylinder chamber. If the spark plug has served its purpose, it will produce a weak spark or not produce one at all. You can check this in the following way:

1. Unscrew the spark plug
2. Place it on the cylinder, connecting it to the candlestick
3. Turn on the ignition
4. Pull the starter handle

If a spark occurs constantly, then this indicates the serviceability of the spark plug. Moreover, not only the spark plug is in working order, but also the ignition system - the coil and the high-voltage wire. If a spark appears on the spark plug, but intermittently (intermittently), then such a part must be replaced. First you need to check the gap between the contacts. The gap size should be from 0.5 to 1 mm.

For each chainsaw model, manufacturers indicate the recommended gap value, so you need to use a reference book. You can measure the gap with a special feeler gauge or a sheet of paper folded several times.

The absence of a spark on the spark plug indicates a malfunction of the ignition system, so before replacing the part, you should make sure that the ignition coil and high-voltage wire are in good condition.

The chainsaw may not start due to clogged spark plug electrodes. The presence of black carbon deposits on the spark plug or wet electrodes - all this may indicate the following malfunctions:

1. Black carbon deposits - the chainsaw carburetor is not adjusted correctly
   . The mixture entering the cylinder contains a lot of fuel and little air. The malfunction can be eliminated by cleaning the carbon deposits on the spark plug electrodes and then adjusting the carburetor

2. If the spark plug is wet (it floods), then this may indicate the following - either the ignition system is faulty (including the spark plug itself), or an excess amount of fuel enters the cylinder, thereby flooding the spark plug.
   First you need to make sure that the spark plug gives a good spark, and only then adjust the carburetor. It is not recommended to dry a wet candle using the calcination method, so it should be wiped dry and then allowed to dry in the sun

3. If the spark plug has red or pink carbon deposits on the electrodes, this indicates that the gasoline used contains a large amount of additives.
   Typically, this effect is achieved by gasoline grade AI-95 and higher, an increase in the octane number of which is achieved by adding additives

When the spark plug is brown (brick), this indicates not only that the chainsaw carburetor is correctly adjusted, but also that the ignition system is working properly. If you are using a new spark plug and when tested it produces a weak spark (or no spark at all), this is a sign of a faulty ignition coil. The coil must be replaced along with the high-voltage wire.

This is interesting!
It is necessary to check the size of the gap between the ignition coil and the magnet. Different manufacturers of chainsaws indicate the recommended gap value (usually the value is 0.25 mm); if this value is higher than the norm, then it should be adjusted using a feeler gauge.

Husqvarna Doesn't Start Well When Hot

Content

What to do if the chainsaw does not start

Good afternoon, dear readers who are not subscribers to my blog! At one inopportune moment, you may discover that your chainsaw will not start. But do not rush to immediately hand over the tool for repair; you may not be able to fix this breakdown yourself without any problems. I will tell you what to do when the chainsaw does not start, and how to find the right solution to this problem.

We analyze the possible causes of failure

Find out why the tool does not start, of course, in the instructions itself. But it is rare that instructions are available at home.

Although each model has its own characteristics, unfortunately, in the end our client remains similar. Therefore, I will tell you the possible causes of the breakdown and possible ways to eliminate them for different tools.

How the mechanism works

All instruments, not foreign ones ( Husqvarna

, Makita, Shtil, Partner 350), not Chinese chainsaws, not domestic ones (Druzhba, Ural), are designed the same. Therefore, it is very easy to find the reason why the device does not start or stall.

Of course there are four elements where problems occur:

• The fuel for which the carburetor is responsible;
• Lubrication;
• The air that enters through the air filter;
• The quality of the spark required depends on the ignition unit.

They depend on each other and do not interact with each other. If any element does not work correctly, the saw stops working.

The first question is that our client has to start the tools differently - hot and cold. Two commonly used mechanisms are responsible for the myth process.

Be sure to look at what is written in the user manual. It states that when turning it on, you need to make sure that the emergency stop brake is engaged. However, starting a saw with a brake is much more difficult, so it is better not to turn on the brake.

READ Husqvarna 240 Review

You can find out from the instructions that inside the body there is a fuel tank and an engine, and outside there is a saw part (bar with chain), a handle and a starter.

First you need to figure out exactly how the tool won’t start. Nettle, the saw starts up, alas, it immediately stalls, or loses power and cutting quality.

Interruptions in your work occur due to problems in the engine. Alas, I would not recommend disassembling it right away. It is better to look for the problem from the simplest option.

It is of fundamental importance to take into account the quality of the fuel. If the mixture is prepared incorrectly, or has gradually deteriorated, then even such reliable instruments as the Ural or Husqvarna

145 will not work. The instructions must indicate the proportions of not special oil for your chainsaw.

The next common problem is that the user fills the candle at the start time. It needs to be inspected; if the oil is completely dry, then the fuel is not passing into the cylinder.

Chainsaw won't start when hot

Does not start

chainsaw on
hot
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If you see black carbon deposits or a lot of fuel, then the carburetor may not be properly regulating the fuel supply.

If your saw tool starts, but immediately stalls, then the problem needs to be looked for in the carburetor jet or fuel filter. Perhaps they are clogged.

To check if the breather is damaged, you need to disconnect the fuel hose from the carburetor and see if the fuel mixture leaks out of it.

If the saw does not start when hot, then the problem may be in the muffler. Sometimes it gets clogged from the exhaust itself.

READ Chainsaw Stihl Ms 180 Starts Poorly - Carburetor Repair. Repair And Carb Tuning

Quite often, saw breakdowns occur due to a small amount of chain lubricant. This happens when the channels are clogged or the oil line is leaking.

Also inspect the connections of the pipes with the oil pump fittings to see if they are leaking.

Very bad

when the failure occurred in the cylinder. When examining it, you may find unevenness or chips, and this may be the cause of the problem.

Restoring the operation of the tool

To restore the operation of the saw, no matter the Ural or Shtil brand, you need to know the location of the breakdown.

First, we check and change the unsuitable fuel mixture. If the saw still does not start, then we check further point by point.

The problem is in the candle - we pull it out and dry it. Under no circumstances should you pierce it, as this will lead to a malfunction of the part. Thirty minutes after drying, you can insert the spark plug back, first checking to see if there is any fuel left in its place.

In addition, the spark plug may simply break, so it is better to have a spare one to rule out the cause.

Another reason that the tool does not start well and stalls is poor contact between the spark plug and the high-voltage wire. If everything is in order here, but there is still no spark, the ignition unit itself may be broken. Such a breakdown can only be corrected by replacing it.

Air filters should be checked and cleaned from time to time. If you have not checked it since purchase, it could become clogged with dust and cause a malfunction.

In models such as Shtil 180, Ural or Partner three hundred and fifty, the breather becomes clogged, which often leads to breakdown. To clean it, you can use a sewing needle.

In models Shtil 180, Druzhba, Ural and Husqvarna one hundred and forty-two, the muffler sometimes gets clogged, it also needs to be checked and cleaned.

READ Chainsaw Husqvarna 236 Doesn't Start Cause Video

If the problem is in the carburetor, then without appropriate experience you should not try to fix it. It is best to turn to specialists.

If, after checking and eliminating the above problems, your saw still does not start, then most likely the breakdown is hidden in the cylinder group.

When, during inspection, you see damage and chips on the piston or cylinder assemblies, these elements will have to be replaced.

If the cause of a chainsaw malfunction is pipes that are leaking, then most likely there is not enough lubricant supplied to the chain. To fix the problem, just replace the tubes and seal the joints with sealant.

Mechanism parts cannot last forever, so they will have to be changed periodically. To find out how long each part lasts, you need to look at the instructions.

Separately about the breakdown of the most common model

Let's look at the problems of Calm one hundred and eighty in more detail:

1. Clogged carburetor or fuel filter. These are the most common problems that can be easily resolved after cleaning. Sometimes the filter has to be changed;
2. Replacing the spark plug;
3. Sometimes the cylinder or seals need to be replaced.

The Shtil saw is quite strong and durable, so you can often fix a breakdown yourself. In fact, the same applies to the Partner, Ural, Makita and Husqvarna

.

When we discover a malfunction in our chainsaw, we look for the cause in small ways, gradually checking and eliminating the problems. Such problems are easy to fix yourself. But if the breakdown is serious, and you do not have enough experience, then this should be done by a specialist.

Video on the topic

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Fuel and air filters - checking their serviceability

If the fuel or air filter is clogged, the chainsaw will also not be able to start. First you need to check the serviceability of the air filter, which is located in a plastic housing. The air filter of a chainsaw gets clogged very often, so it is recommended to clean it before use. To clean, you will need to use a compressor. If the air filter on a chainsaw is clogged with sawdust and shavings, the engine will not start when hot.

Air does not enter the carburetor, so only an excess amount of fuel is supplied to the cylinder, which causes the spark plug to flood.

The case of a clogged air filter on a chainsaw is very interesting. If it is clogged, then the chainsaw usually starts when cold, but as soon as the air damper opens to supply air, the engine immediately stalls after warming up. When hot, a chainsaw with a clogged filter will not start at all, or it will start and immediately stall. When diagnosing the air filter, you need to pay attention to the damper, through which the air supply is limited.

Make sure that the damper moves freely when you operate the lever to close and open it.

• If the valve does not close, then an attempt to start the chainsaw when cold is unsuccessful.
• A similar situation occurs when the chainsaw is running hot. If the engine starts when cold, but stalls when warmed up, this may be due to the fact that the throttle is stuck in the closed position.

As you can see, not only the starting of the chainsaw engine, but also its proper operation depends on the serviceability of the air filter and damper.

In addition to the air filter, the cleaning element responsible for cleaning the fuel mixture can also become clogged.

This filter is located in the chainsaw tank and prevents small grains of sand from entering the carburetor. Just like the air filter, the fuel purifier also needs cleaning. Cleaning is done by replacing the old filter with a new one. The service life of this element depends on various factors, and above all, on the quality of the gasoline and oil used. If you fill the tank with fuel in windy weather, then the probability of grains of sand getting into the tank is 100%.

Depending on the chainsaw model, the principle of replacing the fuel filter may differ. However, even a beginner can cope with this procedure, since it is not difficult and only requires following a sequence of actions.

This is interesting!
Do not store the fuel mixture in the tank for longer than 14 days, as precipitated oil accelerates the process of clogging the fuel filter.

Chainsaw doesn't start well when cold

Violation of the sequence of actions when starting on a cold

If a new chainsaw does not start when cold, the reason may be the incorrect engine starting sequence. As a rule, each manufacturer, in the instructions for the chainsaw, indicates the procedure for starting the chainsaw when cold. Basically, it is similar for all two-stroke internal combustion engines that are installed on chainsaws, and represents the following procedure.

• Closing the air damper (necessary to enrich the fuel during startup).
• Fuel suction using a special primer for this (on some models of chainsaws, the primer is not provided by the design, and therefore this item is not available for them).
• Turning on the ignition (if you forget about this, you may mistakenly consider the tool to be faulty).
• Carry out several movements of the starter until the first “flash” of the engine (it is important not to miss this moment, otherwise it is possible to “flood” the engine).
• Set the air damper to the open position.
• Start the chainsaw engine.

Fuel problems

As in the case of difficult starting when hot, problems in the fuel system can also affect starting or the inability to start even when cold. Carburetor adjustment, contamination of the fuel filter and line are all reasons that cause starting difficulties.

Carry out diagnostics of the fuel system, this is the first thing you need when it is difficult to start when cold.

It is worth paying attention to the quality of the fuel, because... When using a mixture of gasoline and oil that contains a small amount of water, starting may be significantly difficult or impossible.

The mixture must be used fairly fresh, because... When gasoline diluted with oil is stored for more than a month, its properties are lost and it becomes difficult to start, both on a cold and hot engine. For this reason, gasoline may burn poorly.

Engine faults

CPG scuffing, ring sticking, CPG wear, air leaks through seals and gaskets, decreased compression, all these problems can make starting a chainsaw impossible or significantly complicate it. For example, if the CPG wear is not significant, the compression in the engine decreases. In this case, starting “cold” will be significantly difficult, or the saw may stop, the tool will start well.

It is quite difficult to accurately diagnose problems in the engine associated with problems in starting it, and it is better to contact a specialist in this field.

What is a breather and how does it affect the reasons for the inability to start a chainsaw?

Few sawmills know about the existence of such an element on a chainsaw as a breather. This is one of the important parts of the tool, which is responsible for balancing the pressure in the fuel tank. The principle of operation of the breather on a chainsaw is that when the amount of fuel in the tank decreases, a vacuum or vacuum occurs. The less fuel in the tank, the higher the pressure, which becomes an obstacle to the passage of fuel into the carburetor. To reduce the pressure in the tank, a breather is used, which is a valve that allows air to flow in one direction.

If the breather inlet is clogged, then air does not enter the tank, which means the pressure begins to increase. The breather is located on the fuel tank cap of the chainsaw (depending on the model), and if the two-stroke engine of the tool does not start, it is necessary to check the serviceability of the breather.

It is quite simple to verify that the breather is faulty:

• Unscrew the gas tank cap. If air bleeds, this indirectly indicates a malfunction of the pressure regulator.
• Screw on the gas tank cap, and then try to start the engine again. If the engine starts, but after some time of operation it stalls, then the breather needs to be cleaned.
• There is another way to check the serviceability of the breather - disconnect the fuel hose from the carburetor. If fuel does not flow out of it intermittently, then the device is working properly. If the stream is weak and intermittent, then you need to clean the breather on the chainsaw to start the engine

The breather (fuel cap valve) is cleaned with a needle. If the breather is heavily clogged, you will need to remove the filter element and clean it. On different models of chainsaws, the location of the breather is different (on most models it is located in the gas tank cap). The video below shows the process of cleaning the breather using the example of a Husqvarna chainsaw.

Chainsaw won't start when hot

Does not start

chainsaw on
hot
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If you see black carbon deposits or a lot of fuel, then the carburetor may not be properly regulating the fuel supply.

If your saw tool starts, but immediately stalls, then the problem needs to be looked for in the carburetor jet or fuel filter. Perhaps they are clogged.

To check if the breather is damaged, you need to disconnect the fuel hose from the carburetor and see if the fuel mixture leaks out of it.

Exhaust duct or muffler cleaning and influence on engine starting

When a chainsaw operates, resinous deposits—carbon deposits—are deposited on the walls of the exhaust channel and muffler. Periodically, this carbon deposits need to be cleaned, but most tool owners remember this only after the chainsaw does not start. Why is this happening? The reason is that the burnt food has nowhere to go, so the engine will not be able to start. When the exhaust channel is contaminated, the chainsaw not only loses power, but also causes the engine to stop working on its own.

Deposits on the walls of the muffler occur due to the following factors:

1. Using low-quality gasoline and oil
2. Incorrect ratio of gasoline and oil when preparing the mixture
3. Long-term use of the tool without preventive measures

There are no difficulties in cleaning a chainsaw muffler. The cleaning sequence is as follows:

• To begin, unscrew the muffler mounting screws.
• The cooling panel with the sealing gasket is dismantled
• Next you need to remove the spark arrester
• The resonator body is disassembled
• All elements are cleaned and washed from carbon deposits with kerosene or other cleaning liquids. This must be done exclusively in a respirator and goggles. Carcinogenic substances are very dangerous for humans
• Wait for the cleaned elements to dry
• Reassemble in the reverse order of removal

When cleaning the walls of the exhaust channel, it is necessary to cover the cylinder hole with a rag. This will eliminate the possibility of dust and sand getting into the cylinder. After cleaning the muffler and exhaust channel of the chainsaw, you can start starting the engine of the tool. At the same time, you will feel how the chainsaw will work at full power.

If the chainsaw doesn’t start, what should you do?

The main reasons why a chainsaw does not start are discussed above. Moreover, this applies to instruments of different brands: Shtil, Husqvarna, Partner, Makita, Champion and others. Druzhba chainsaws have a different operating principle, but in general, troubleshooting should begin with the ignition system, or rather, inspecting the condition of the spark plug electrodes. If the manipulations carried out do not help to obtain the desired result, then it is necessary to resort to more serious actions. This means you need to do the following:

1. Check the serviceability of the carburetor and adjust it
2. Measure the compression level of the engine, and then draw the appropriate conclusion about its serviceability
3. Checking compression in the crankcase

Checking the compression in the cylinder allows you to assess the condition and serviceability of the CPG

. To measure compression you will need a compression meter. It is screwed into the spark plug hole, after which the starter handle is pulled. The compression gauge shows the corresponding pressure value in the cylinder. This value should be at the level of 8-12 atmospheres.

If the pressure is significantly lower, then this is a direct sign of a malfunction of the device. In case of malfunction, the cylinder-piston group is replaced with a new one. When installing a new CPG, it is necessary to carefully treat all parts with oil so that chips and scuffs do not form when the engine starts.

If there is no compression in the crankcase, the chainsaw will also not start.

The reason for the decrease in pressure in the crankcase is the gasket, or rather its damage. This gasket is located between the cylinder and the crankcase and to ensure its serviceability, the following manipulations should be performed:

1. Disconnect the fuel line from the tank
2. Place the tube in a container with a prepared mixture of gasoline and oil.
3. Start the chainsaw engine
4. If the engine starts and fuel is sucked in, this indicates that the gasket is in good condition.

If fuel is not drawn in, then the crankcase gasket needs to be replaced.

The carburetor is the most important and most complex element of a chainsaw.

If all the above steps did not help to obtain a positive result, then this indicates that the carburetor is faulty. The main malfunction of the carburetor is clogging of its channels and jets. Membranes and other elements fail less often. In any case, you will need to disassemble the chainsaw carburetor, clean it and replace failed parts.

As you can see, there are enough reasons why a chainsaw won’t start. To find out what exactly happened in your case, you need to remember the symptoms the day before. Perhaps before the chainsaw stopped starting, there were malfunctions in the engine, a decrease in power and performance, and other breakdowns were also present. Based on these technical symptoms, it is necessary to begin the search. If you don’t know where to start, then diagnostics should be carried out in order, as described in the material.

What to do if the chainsaw continues to not start?

If the initial inspection did not yield anything or the defects were eliminated during the search process, but the chainsaw still does not start, then you need to look for more serious reasons. It is best to identify and repair such breakdowns at a service center. However, if you have experience, you can find and eliminate them yourself. What to diagnose and check?

1. Compression in the cylinder;
2. Compression in the crankcase;
3. Carburetor operation.

In the first case, checking the compression in the cylinder will allow you to find out the condition of the cylinder-piston group (CPG) of a chainsaw that does not want to start when cold. To do this you need a compression gauge. The device is screwed into place of the spark plug and the engine is started idle. Measuring the readings allows you to judge the condition of the CPG. In the absence of a compression gauge, you can determine the compression in the cylinder offhand as follows:

• Place your finger on the spark plug hole;
• Try to start the chainsaw engine.

By placing your finger on the spark plug hole and pulling the starter, you can check the compression in the cylinder

If you feel that your finger is being pulled strongly into the spark plug channel, then everything is in order with compression. The absence of vacuum in the chamber indicates a malfunction. The cylinder-piston group needs a more detailed inspection, which will give an idea of ​​the condition of the piston and cylinder, piston rings and bearings.

A chainsaw may not start when cold due to a lack of compression in the engine crankcase. The main reason for this is damage to the gasket located between the cylinder and the crankcase. It is quite easy to detect a lack of compression:

• Disconnect the upper tube from the carburetor;
• Pour gasoline into a regular cork;
• We immerse the removed tube in the fuel;
• We pull the starter several times.

If fuel is sucked out of the cap when the chainsaw starter starts, then everything is fine with compression. If not, look at the gasket.

If the fuel is drawn in, then everything is fine - the gasket is intact. Otherwise, you will have to purchase a repair kit and make a replacement. How to do this, watch the video why a Chinese chainsaw won’t start:

Starting the tool may be complicated by improper operation of the carburetor or its breakdown. It often happens that during the sawing process the fastening screws become loose and air is sucked into the cylinder. Check that the carburetor is securely fastened. Inspect it for fuel leaks. There can be many reasons for the malfunction. It is possible to accurately determine the malfunction, eliminate it and fine-tune the carburetor only at a service center.

After going through a step-by-step troubleshooting of the chainsaw engine, you will be able to find the malfunction, fix it yourself and successfully start your working tool. Do not take on types of work that you are not confident in. Entrust troubleshooting and troubleshooting to specialists from the service center.

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Main reasons for not starting when cold or hot

If there is a spark on the chainsaw, but the tool does not start when cold, then the reason lies directly in the lack of compression. Measure the engine compression to verify this problem. If the compression value is not lower than 8 atmospheres, then everything is in order. If not, then the engine has served its purpose and needs to be replaced by the CPG. When metal parts are cold, they contract, thereby reducing compression. To start a chainsaw when it’s cold with low engine compression, you should do the following:

1. Pull the starter handle until the internal parts warm up due to friction.
2. When the parts warm up, compression will increase, so the engine will start
3. These manipulations are recommended to be carried out in the warm season, since starting a chainsaw in winter with low compression is almost impossible

This is interesting!
When trying to start the chainsaw when cold, you must completely close the air damper valve.
Cold starting of the engine occurs directly on enriched fuel. It is worth noting that working with a tool with low compression is very harmful. In addition to low performance, such operation will lead to permanent breakdown of the chainsaw engine.

Another situation is when the chainsaw does not start when hot.

The reason for this is, first of all, engine flooding. If the chainsaw starts well when cold, but when there is a break after work and difficulties arise with starting, then it is necessary to start without closing the air damper. The throttle must be fully open (air supplied) to start the engine hot. If you cannot start the chainsaw, then you need to close the air damper halfway. Try to start the engine, and as soon as it starts, you can open the throttle completely.

If you cannot start a warm chainsaw engine, then proceed as follows:

1. Unscrew the idle speed screw ¼ turn clockwise
2. By increasing the number of revolutions, the process of starting the engine is simplified
3. Start the engine with the choke half open
4. After starting the engine, return the idle speed screw to the reverse position if the chain moves while idling.

Flooding of the spark plug may be due to a malfunction of the ignition module, as well as a large gap between the coil and the magneto. If the reason for the impossibility of starting the chainsaw engine is the carburetor, then it should be properly configured as quickly as possible.

Why might a chainsaw not start?

A chainsaw is a fairly common tool that is used in almost every household. The versatility of this device allows it to be used not only for its intended purpose, but also to perform other functions. However, a chainsaw is still a good assistant when cutting firewood, felling trees, pruning trees, etc. But like any tool, a chainsaw can stop working correctly over time. You can repair the instrument yourself if the problems are not complex, but it is better to take it to a specialized center.

Doesn't start when cold

One of the most common problems is engine failure to start or poor performance in cold weather. This situation is especially common in winter. Experts say that this can happen due to incorrect actions during startup. Before starting, it is advisable for the owner not to rely on his own knowledge, but to read the instructions that are included in the delivery kit. The sequence of actions when starting a chainsaw when cold is similar for most two-stroke engines:

1. Block the air access with the damper;
2. Fuel suction (depending on model);
3. The ignition turns on. If you forget about this point, the saw will not start;
4. Carry out the movements to start the starter. It is important to perform them before turning on the engine for the first time, because otherwise there is a risk of motor failure.
5. Open the air damper;
6. Start the chainsaw by pressing the gas.

After winter I can’t start the chainsaw, what can you tell me?

If the chainsaw is not used in winter or summer, then with the onset of spring, when the need to prepare firewood arises, a malfunction is often observed in the form of the inability to start the engine of the tool. The reasons may be different, but the first thing you need to do is check the presence of gasoline in the tank. If the chainsaw has not been used for a long time, but there is still fuel in the tank, then the difficulties in starting the two-stroke engine are associated with the cause of stagnation of fuel.

If the fuel in the tank was not drained before storage, then there is a high probability that a plug has formed in the carburetor. You will need to disassemble the carburetor and clean it. To avoid these steps, you can do the following:

1. Unscrew the spark plug and inspect it. If it is dry and the correct brown color, then no fuel is being supplied to the cylinder.
2. 20 grams of fuel mixture is drawn into a syringe and splashed into the cylinder
3. The spark plug is screwed in and the engine is started.
4. If the ignition system is working properly, the chainsaw will start

When starting the engine, the resulting plug in the carburetor will break through and the engine will operate normally. If the engine starts and stalls on a chainsaw, then you should repeat the procedure of adding fuel to the cylinder several times. If attempts are unsuccessful, then you need to clean the carburetor, but first check the serviceability of the fuel and air filters, the ignition module and clean the exhaust channel (muffler).

Difficulties in starting the chainsaw cannot be ruled out due to the following reasons:

• Damp spark plug electrodes
• Oxidation of ignition module wire contacts
• Damage to the insulation of a high-voltage wire
• Ignition coil failure
• The need to adjust the carburetor

Difficulties starting chainsaws arise sooner or later. Everything depends not only on the quality of the instrument and its price, but also on the features of care, operation and storage of the instrument. With proper care and storage of the tool, you will never have problems starting the chainsaw engine.

Why does a chainsaw have trouble starting?

• fuel and air filters;
• reduced compression;
• carburetor adjustment;
• spark plug;
• ignition coil;
• gap between the ignition coil and the flywheel;

Let's look at each reason in more detail.

Fuel and air filter

Contamination of the main filter elements of a chainsaw negatively affects its operation.

For example, a dirty air filter will not provide enough air to the carburetor, which will affect the quality of the air-fuel mixture and normal engine starting. A dirty fuel filter will make it difficult or even cut off the flow of gasoline to the carburetor and make it impossible for the engine to operate.

Reduced compression

One of the common cases of difficult starting of a chainsaw is wear of the CPG (cylinder-piston group).

As you know, for a chainsaw to start normally, compression must be present in its engine. It is necessary for normal compression of the fuel mixture in the engine cylinder, and it also affects the operation of the fuel pump.

During the operation of the tool, the compression value drops and the chainsaw begins to have difficulty starting.

The reasons for the lack of compression or its decrease may be natural, because The engine wears out during operation. Problems can also be caused by a serious breakdown, for example, a scuffed CPG, or a broken piston ring.

A sign of low compression is weak starter resistance when starting. With reduced compression, a decrease in the power of the chainsaw is observed, which negatively affects its performance. The problem is eliminated by replacing the piston rings, or the entire CPG.

Carburetor adjustment

Incorrect carburetor adjustment will cause the chainsaw to not develop full power. It will be difficult to start, or not start at all. Carburetor settings directly affect the quality of the air-fuel mixture, which is necessary for normal starting and further operation of the engine.

If the carburetor is incorrectly adjusted, there will be more or less gasoline in the fuel-air mixture than required, and the mixture will not ignite even with normal sparking.

Excess gasoline in the mixture is usually called overflow. A characteristic sign of overflow is a wet spark plug, after several unsuccessful attempts to start the chainsaw.

Spark plug

The spark plug is one of the main elements of the ignition system. A spark is formed at its electrodes, and if this element fails, starting will be difficult or not possible at all.

The spark plug may fail completely, or work intermittently or produce a weak spark. Checking the spark plug is quite simple; to do this, you need to unscrew it from the engine, attach it to the cap of the high-voltage wire and, placing it on the cylinder, pull the starter. If the spark plug is in order, the spark will be powerful with a bluish tint. A weak spark with a reddish tint is a sign of a problem. A defective spark plug needs to be replaced.

Ignition coil

The reason that a new chainsaw does not start, or starts poorly, may be the ignition coil. Modern chainsaws are equipped with electronic ignition coils. This part cannot be repaired, and, as a rule, if there is a defect, it is completely replaced.

Gap between ignition coil and flywheel

An incorrectly set gap between the flywheel and the ignition coil contacts affects the quality of spark formation, which in turn is responsible for normal starting and stable operation of the engine.

Chinese and new chainsaw does not start, what could it be?

The popularity of Chinese chainsaws knows no bounds. This is due to their main advantage - affordable cost. At the same time, owners of Chinese chainsaws often have questions about problems starting the engine of the tool. Before you find out why a Chinese chainsaw won’t start, you should note one feature - the design of these tools is no different from Russian, German and other manufacturers. That is why the reason why the chainsaw does not start can be detected based on the algorithm described above.

Chinese chainsaws are very sensitive to fuel quality, so in the diagnostic algorithm, checking fuel quality comes first. The use of low-quality fuel leads to the fact that the tool does not work at full capacity, its service life is reduced, and difficulties arise with starting. The instructions for the tool indicate the recommended type of gasoline and oil, which are important to use in order for the Chinese chainsaw to work for a long time and at full power.

If you bought a new chainsaw and it does not start, then troubleshooting should begin by returning the tool to the store. Make sure that you start the engine of the tool correctly, and if you cannot achieve a positive result, then you need to return the tool to the store under warranty. Attempting to troubleshoot the problem yourself will leave traces and may void the warranty.

It is recommended to double-check that the fuel mixture is prepared correctly. If everything is done correctly, but the engine of a gasoline tool does not start, then there is a high probability of a manufacturing defect. There can be a defect with any part, but this should already be determined in the store’s service center.

Chainsaw won't start when hot

In cases where the chainsaw does not start when hot, you need to conduct a visual inspection of all the main components of the chainsaw. The inspection should start with the spark plug. Check the spark, inspect the surface of the spark plug electrode, these actions will help determine the direction in which to look for the problem.

Malfunctions in the ignition system

If, upon inspection of the spark plug, it is found that it is wet and sparking does not occur at the contacts, this means that the problem should be looked for in the ignition system, inspect the coil, and check the gap between the flywheel and the coil contacts. You can also check how tightly the cap of the high-voltage wire sits on the spark plug, and the spark plug itself. Try replacing it with a new one.

Problems in the fuel system

If upon inspection it is discovered that there is a spark, but the spark plug is dry, then there is a problem in the fuel system. Checking it should start with the fuel filter. Next, you need to inspect the fuel hose and its attachment to the carburetor, pay attention to fuel leaks from the carburetor and the presence of gasoline in the air filter housing. It is advisable to start removing the carburetor only if a visual inspection does not allow you to determine the cause of the breakdown.