The chainsaw won't start. Why? Reasons and how to avoid.

The Stihl chainsaw is a device from one of the famous German developers, the Stihl company, which guarantees quality, ergonomics, maneuverability and operator comfort in working with the tool, as well as excellent performance, despite its compact size. The range of technical capabilities of the Shtil chainsaw allows you to solve problems at both professional and household levels. Saws of this brand have more than enough advantages, but, like all complex equipment, there are some disadvantages.

Why does the Shtil chainsaw not start when it's hot? Why does a chainsaw have trouble starting?

Main reasons:

• 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.

Engine breakdowns

Why does a chainsaw smoke is a fairly common question and problem. To create the force that is transmitted to the chain, a specific internal combustion engine is installed. During normal engine operation, the amount of smoke is minimal, the chain runs smoothly, and fuel consumption is within normal limits. Signs of engine trouble are as follows:

1. There are many problems with starting.
2. The engine overheats during operation.
3. At idle or under load it stalls.
4. A sharp, uncausal drop in power.
5. Smokes a lot.
6. Instability during operation, an unreasonable drop or increase in speed.

Chainsaw engine

The chainsaw does not cut well due to insufficient power. In addition, strong smoke or extraneous sounds may indicate severe wear of the internal structure. Most of the above signs indicate a serious malfunction, which is difficult to solve on your own.

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.

Lubrication system - no oil supplied to the chain

If the chainsaw chain is not lubricated, you cannot work, as this could result in serious repairs. At this moment, the chainsaw chain is dry, quickly stretches, the oil level in the tank does not decrease, and the tire becomes hot. The main reason may be air leakage due to a violation of the integrity of the oil hose. It should be sealed, and if this does not help, replace it.

There are several other reasons:

• breakdown of the “worm” (oil pump drive), which is expressed in a violation of the thread of the plastic gear. The problem is solved by replacing the part with a new one;
• The main pump filter is clogged, which needs to be cleaned or washed in clean gasoline.

With a Stihl chainsaw, depressurization of the oil line most often occurs at the place where it is installed in the housing. It's easy to fix using heat shrink tubing.

How to start a chainsaw correctly - follow the instructions

Before you move on to studying the causes and repairs of chainsaw malfunctions, you need to understand whether you are starting to work with your chainsaw correctly. After all, it is precisely because the tool is not started correctly that its engine stalls or does not start at all.

Start the chainsaw strictly according to the instructions in the operating instructions. The procedure is as follows:

• First, engage the chainsaw's chain brake by pushing its lever away from you;
• Remove the protective cover from the tool tire;
• Press the decompression valve, if provided in the design of the chainsaw. This will make starting the engine much easier;
• If the design of the chainsaw includes a fuel pump for manual pumping, press it several times;
• Place the combination throttle lever in cold start mode. To do this, lock the throttle trigger and lower the lever to its lowest position;
• Place the saw on a flat surface, removing any foreign objects from under its bar;
• Hold the chainsaw with both hands, placing your left hand on the handle and your right hand grasping the trigger cable. Place the toe of your right foot into the “eye” at the back of the chainsaw;
• Slowly pull the cable towards you until you feel resistance. Then quickly pull the cable towards you several times until you hear the motor start briefly;
• Move the throttle lever to the middle position;
• Pull the cable again several times until the engine starts;
• As soon as the engine starts running, sharply press the gas trigger and hold it for several seconds. At this time, move the throttle lever to its highest position;
• Raise the saw from the ground without touching the gas lever;
• Pull the chain brake handle towards you;
• Raise the saw over old newspaper to make sure there is oil flowing to the chain. If small spots of oil appear on the paper, then you can start working.

https://youtube.com/watch?v=mB_j_KfjGZw

Chainsaw Shtil stalls: reasons

If the tool turns off immediately after starting, it means that some device or part has broken down. To determine the cause, the mechanism is tested independently or in service workshops. Sometimes the reason that the mechanism does not start well is improper maintenance of the saw:

• insufficient amount of gasoline;
• poorly prepared fuel mixture;
• poor quality of lubricant;
• muffler clogged with combustion products;
• unadjusted carburetor;
• obstruction of the air filter;
• piston or cylinder failure.

When you press the gas

The sawing units operate at idle speed, but the chain saw stalls when the gas is pressed, as the load increases. Before use, warm up the tool by running the engine at idle speed for a minute. If this is neglected, the motor stops after pressing the pedal. Other reasons may be:

• clogged or unregulated fuel mixing unit;
• a clogged air filter does not provide the required air flow when the load increases;
• a dirty gasoline filter does not allow the required amount of mixture to pass through;
• the cylinder and piston walls rub.

A low octane number of fuel causes brakes, since this circumstance prevents the engine from achieving the required power when the load increases.

At idle

Violation of the functionality of the fuel unit system leads to air leaks. In this case, the unit stalls at idle and does not maintain its number. Additional suction reduces the air impulse to the fuel pump and passes through the sump membrane or crankshaft seals. Diagnostics is done with a vacuum gauge.

Stopping the engine when cold occurs for other reasons:

• the spark plug channel contains an excess amount of combustible mixture;
• the gap between the tip of the spark plug and the high-voltage cradle is not adjusted;
• power supply failure.

Check the seals by pouring gasoline into the crankcase; the leak is visible visually. This means that the engine does not operate at idle speed, and at high frequencies, leaky oil seals will lead to bearing jamming. If elements leak, they are replaced with new ones and sealed.

Full speed ahead

Sometimes the engine stalls after normal operation

To establish the cause, pay attention to the accompanying circumstances:

1. The engine stalls in the middle of operation for no apparent reason. The starter is in a stationary position and does not turn. This means that the tool is jammed and requires urgent repair.
2. During normal operation, power decreases in a short time and the engine stops, the cylinders are overheated. The situation indicates an air leak under the rubber pipe between the carburetor cylinder, possibly due to a rupture. The air becomes depleted of fuel; the pipe needs to be replaced.

Not gaining momentum

Many mechanism systems are involved in the startup, so the loss of speed of the Stihl chainsaw after idling can be a consequence of various factors. Reliable idling and interruptions in the engine under load can occur for the following reasons:

• development of engine life;
• wear, deformation and corrosion of the piston group;
• malfunction of the ignition coil or spark plug;
• unbalance of carburetor screws.

If the tool does not develop speed, then the conductivity of the hole in the fuel tank cap is impaired. The occurrence of a vacuum does not provide the required amount of fuel, so the engine does not gain the required power. The speed decreases when carbon dioxide accumulates in the muffler, and the removal of combustion gases is difficult.

Doesn't slow down

The tool quickly reaches maximum speed without losing power. This situation is explained by the fact that:

• the throttle valve does not work due to a weakened spring or traction element;
• the switch on switch periodically fails;
• there is no corkscrew on the throttle axis;
• the carburetor is clogged;
• The fuel hose and gasoline filter are not functioning properly.

Filter

A “rich” or “lean” fuel mixture will sooner or later cause a breakdown. Perhaps even expensive. To prevent this from happening, it would be a good idea to regularly check the filter for abrasions, as well as for breaks in the filter fabric itself.

How to check the fuel filter and replace it

To check the current condition of the fuel filter, you must perform the following steps:

1. Remove the fuel hose from the carburetor fitting and direct it into a working container.
2. Press the so-called “paging” button several times.

If gasoline flows unevenly and jerkily, then it’s time to install a new filter element. This is done quite simply:

1. The fuel tank cap is unscrewed.
2. Using tweezers or any other device, the filter itself is removed.
3. After disconnecting the old filter, you need to install a new one and lower it into the fuel tank.

How to clean the air filter

If a sufficient amount of air is not supplied, the fuel mixture becomes too rich, which leads to disruption of normal engine operation. Regular purging of the air filter, and in particularly advanced cases, washing in a soapy solution will help avoid such problems.

Please note that washing in acetone, gasoline or other aggressive solutions is not allowed. This may damage the integrity of the filter element.

Why does the chainsaw stall?

If the chainsaw starts and stalls, the reasons may be different. An external inspection should be carried out before attempting to repair the instrument.

If the saw stalls during operation, you should check the presence of a mixture of oil and gasoline in the tank. If the fuel mixture runs out, the device will not work. In situations where there is still gasoline left, you should evaluate the quality of the tool before turning it off. The appearance of extraneous sounds and the subsequent sudden stop should alert you.

The formation of carbon deposits on the electrodes can also cause difficulties in the operation of the tool. You should carefully inspect the device and clean it if necessary.

When you press the gas

In cases where the chainsaw stalls when you press the gas, you should check the muffler and fuel filter. A possible cause of the problem is a leak in the fuel hoses. In some cases, adding speed helps.

Sometimes checking all the details does not give results, the tool suffocates, chokes when gas is added. If the device stalls when a person presses the gas, it is possible that the fuel supply is insufficient for normal operation. This phenomenon occurs due to a clogged carburetor or filter.

Damage can also occur due to the air filter becoming clogged with dust. When you give gas, the device stops working. You should not fix the problem yourself, since each model has individual characteristics.

The problem may be caused by insufficient or lack of lubrication on the chainsaw chain. If the chain is dry, you should clean the channels through which oil is supplied to the device bus. If the oil leaks, there are cracks and defects in the pipes, they need to be treated with sealant.

Under load

In situations where the device stalls under load, the problem may be with the gas tank or filters. Check the fuel quality and change the filter.

Often the saw does not gain speed due to the fact that the mixture poured into the gas tank has a low octane number. There is not enough power, sufficient heating is not possible, the chainsaw stalls under load.

Often, malfunctions of components lead to the device stalling under load. Hoses, seals, and gaskets should be checked for leaks. If parts are faulty, you can try to repair or replace them.

In cases where the chainsaw starts and immediately stalls, there is not enough fuel, the device does not heat up. The device must be recharged

It is important to use the correct mixture. Different types of fuel are better suited for different models

It is necessary to read the instructions, recommendations, reviews of people for whom the device works normally.

Idling

In situations where the chainsaw stalls at idle, you need to inspect the condition of the muffler. If the part is dirty, exhaust gases are poorly removed, the engine cannot continue to work and stops.

The saw stalls at idle and in cases where the carburetor is not configured correctly. For beginners, it is better to entrust the repair to specialists, since there is a possibility of incorrect settings, due to which the tool will not be able to work. A tachometer is required to adjust the carburetor.

At high speeds

If the device stalls at high speeds, pay attention to the condition of the gasoline and air filters, the serviceability of the fuel hoses

A dirty air filter can be washed under warm running water.

It is important to thoroughly dry the part before installing it so that water does not damage the serviceability of the tool.

If fluid stops flowing through the fuel hose, it is clogged. You can clean the part or replace it with a new one.

In cases where the saw stalls at high speeds, but the liquid completely flows through the hose, and the air filter is clean and in good working order, look for the cause of the breakdown in the fuel filter. Replace it with a new one or clean it.

In some cases, the problem is hidden in the gasoline pump. When a component wears out, fuel begins to leak through the walls. If this phenomenon is observed, a new pump should be installed.

When tilted

If the saw does not develop speed when tilting, turns off, or stops working, you need to check the fuel level in the tank. If it is not too high, the device in an inclined position is not supplied with sufficient fuel, since the fuel pipe is above the mixture level.

Repair of Stihl MS 660 chainsaw

Question: I use a Chinese chainsaw Stihl MS 660. It starts very poorly, if it starts, it seems to work fine, if you turn it off, it won’t start again.

I unscrewed the spark plug, short-circuited it to the housing, turned on the red spark. Do you recommend replacing the spark plug or needing a new magneto? Gasoline is filled with AI-80.

Answer: I think we can’t do it with half measures. It is possible that the problem is not in the ignition. Perhaps the carburetor is faulty, perhaps there is something wrong with the engine.

Well, try replacing the ignition. If you find where to get a new one. It won’t help - the carburetor is known to be good.

Question: Stihl MS 660 chain saw. Is it possible to install a tire index 3002 000 8058, what are the differences between 3002 and 3003 in terms of fastening?

Answer: Impossible. 3003 differs from 3002 in the shank.

Question: Chainsaw Shtil MC 660. When cold it started well, then when hot it took half a turn. But after several cuts it suddenly died out.

Attempts to start it did not lead to anything. At home I unscrewed the muffler, the piston is clean, there is a small scratch on the piston at the very bottom, I think this is not critical.

I decided to clean the carburetor, started to unscrew it, but it was loose, twisted it, pulled the starter, zero emotions. I unscrewed the carburetor, washed it, blew it out, and reassembled it.

Zero in the factory again. Two pipes come to the carburetor, one from the fuel tank, from the bottom, the second from the top and goes underneath the cylinder, what is it for?

True, when I removed the needle, I was afraid that the spring would fly away, I got distracted, and missed the moment when the piece of iron was positioned correctly. which raises the needle.

Maybe it was not installed correctly later, there is a bulge and depression on the plate, how should it press the spring, which side? Should the rings on the piston rotate freely?

Answer: The saddest thing is that it suddenly stalled. Most likely, change the piston (at best).

The most common piston failure on Chinese models is that the bearing of the lower head of the connecting rod is destroyed and the needle from the bearing (or a piece of the separator) cuts the rings like a knife, and in most cases flogs the cylinder.

Maybe not everything is so bad in your chainsaw, but if there were air leaks, the saw would first throttle at idle, stall under load, and would not start at half a turn.

The tube on top that goes under the cylinder is a pulse channel, but it stays there tightly, there have been no cases of problems with it. The bulge on the needle valve lever should face the spring, pressing it.

I advise you to remove the cylinder (not difficult and not long), in addition to the muffler and carburetor, you also need to remove the carburetor strut.

There are two bolts holding it there. The carburetor pipe - the cylinder does not need to be removed. When you lift the cylinder, be careful not to damage the gasket (if you don’t have a spare one).

And then everything is visible. In addition to the cylinder, piston, rings, look carefully at the bearing of the lower head of the connecting rod and see if there is any radial play when you pull the connecting rod (axial play is normal).

Question: Saw Shtil MS 660 stalls when you press the gas sharply, how can I fix it?

Answer: There may be a problem with the carburetor.

Question: Shtil 660 chainsaw - high idle speed - how to adjust. Disassemble before accessing the carburetor or are there other ways or reasons for increasing the idle speed?

Answer: The carburetor settings are off. There is no need to disassemble, there are holes on the right side for a screwdriver, direct access to the carburetor screws.

Question: how to break in a new Shtil MS 660 chainsaw?

1. Thread the saw. 2. Start it. 3. Let it sit at idle for half a minute.4. Work without overload! That's right?

Answer: Yes, absolutely true. But since the ambient temperature is high, try not to overheat the engine.

After each cut, let the saw idle for 3-5 seconds. Well, after 10-15 minutes, turn it off and let the saw cool (at least 10 minutes).

Thicker logs can be sawed at full throttle; thin logs (no thicker than 15 cm) can be sawed by releasing the gas a little.

It is usually recommended to operate in this mode until two to four tanks are exhausted; in general, it is better to play it safe a little. Somewhere in this mode the engine should be run in (run in).

Gasoline/oil mixture as indicated in the instructions. Well, you can add a little more oil during the break-in period; this will not harm the engine. Do not run in at idle speed under any circumstances!

Question: Please tell me, the chain is slipping off the drive sprocket on a Stihl ms 660 chainsaw, how can I fix the problem?

Answer: There may be several reasons: Worn drive sprocket; Wear of the saw bar; Saw chain wear.

Question: I bought a chainsaw, it says calm ms 660, after the first breakdown I realized that it was a fake. Overall I was pleased, it worked perfectly, started well. Tell me what improvements can be made for future use?

Answer: Install a reinforced starter. Change the fuel filter (it comes without a filter element).

Change the spark plug (the spark plug will fail and will not start). Change the tire to 15 inches (relieve the load on the engine). Change the chain (Chinese ones break).

Question: I bought a Chinese chainsaw Stihl ms 660, but I don’t know what to use. At idle I ran two barrels of Husqvarna oil and poured VMGZ-30 into the gearbox. saws. If so, please tell me what kind of oil is needed for the mixture.

Answer: For refueling you only need branded oil special for two-stroke engines with AI-92 gasoline in the proportion for Chinese saws 1:25, and it is advisable to run it in not at idle, but at minimum speed under minimum load.

Cut for 5 minutes and idle for 30 seconds, using up two or three tanks, and cut something small. During break-in, you can use a little more oil.

Why the chainsaw does not start, reasons and solutions. How the mechanism works

Almost all tools, both foreign (Husqvarna, Makita, Shtil, Partner 350), and Chinese chainsaws, and domestic (Druzhba, Ural), are designed the same. Therefore, finding the reason why the device does not start and stalls will not be difficult.

There are four elements where problems may arise:

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

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

Let's start with the fact that all tools start up differently - hot and cold. Two commonly used mechanisms are responsible for this 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. But starting a saw with a brake is much more difficult, so sometimes it’s better not to turn on the brake.

As you can find out from the instructions, 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. For example, the saw starts up, but immediately stalls, or loses power and cutting quality.

Perhaps interruptions in operation occur due to problems in the engine. But I would not recommend disassembling it right away. It is better to look for the problem from the simplest option.

It is very important to consider the quality of the fuel. If the mixture is prepared incorrectly or has deteriorated over time, then even such reliable tools as the Ural or Husqvarna 145 will not work

The instructions must indicate the proportions and special oil specifically for your chainsaw.

Another common problem is that the user fills the candle during startup. It needs to be inspected; if it is completely dry, then fuel is not passing into the cylinder.

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.

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.

It is very bad when a breakdown occurs 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. 30 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 350, the breather becomes clogged, which often leads to breakdown. To clean it, you can use a sewing needle.

For models Shtil 180, Druzhba, Ural and Husqvarna 142, the muffler sometimes gets clogged, it also needs to be checked and cleaned.

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.

Spark plug problem

A problem with spark plugs is one of the most common causes of chainsaw breakdowns!

This is one of the most common reasons why the engine stalls when cold. As a rule, its electrodes are covered with a layer of corrosion and carbon deposits, as a result of which the distance between their ends decreases - and there is ultimately no room for a spark to jump through.

The cause of corrosion and carbon deposits on the electrodes is uneven fuel supply, which is already a problem with the carburetor, which can be solved separately. There doesn’t have to be soot on the spark plug - there may be no spark because the fuel completely fills it when it’s hot, which also indicates problems with the carburetor.

The spark plug itself must be removed, dried and checked to see how the spark passes through it:

1. First, remove the wire and unscrew the spark plug.
2. Return the wire end to its original position.
3. Place the spark plug on the cylinder with the skirt.
4. Check for a spark by starting with the starter.

If there was a spark in this way, then you need to immediately move on to the problem with the carburetor. If not, then the spark plug must either be cleaned of rust and carbon deposits, or replaced. It is also possible that adjusting the distance between the electrode contacts will help.

Other reasons for the lack of spark include:

The final check for problems with the spark plugs can be completed with a number of simple procedures, after which the chainsaw should start:

1. Unscrew the spark plug and give it a full inspection.
2. Clean it from rust and deposits, dry it
3. Place the ends of the electrodes at the correct distance.
4. Drain all excess fuel from the engine of the tool so that the ignition compartment does not flood.
5. Place the spark plug back and try lighting again.

If these procedures helped and the saw began to work and the chain began to move, then you can work like this for about 5-30 minutes until the spark plug floods again

It is important to understand that this solution is temporary and just indicative. The main problem lies in the carburetor.

The question with him is ambiguous: in any case, it is necessary to adjust the fuel supply, but how to do this - yourself or with the help of a mechanic - is up to you.

When setting up the carburetor, be sure to use a tachometer, which will allow you to find out the number of engine revolutions with greater accuracy.

Based on them, you can already adjust its operating mode by adjusting the tightness of the screws on the carburetor block in several scenarios:

A complete inspection of the carburetor is necessary if it was not possible to determine a specific problem, but there is confidence that the jamming of the saw is associated with this particular part.

The audit is carried out as follows:

1. It is necessary to remove all communications (wires and hoses) from the device;
2. Carry out cleaning and purging. It is better to do this without removing the carburetor;
3. Remove the product and clean it a second time so that no traces of fuel or oil remain inside;
4. Gradually disassemble the device, guided by the drawing in the documentation or drawing up a diagram yourself;
5. All channels must be blown out with compressed air, and parts must be washed in an industrial solvent;
6. Give the parts at least 2 hours to dry;
7. Reassemble the carburetor, strictly following the instructions in the documents and diagram;
8. Connect back.

What to do when a candle on a chainsaw fills

Before heading to the service center, it would be a good idea to try to fix the current malfunction of the spark plug on your chainsaw yourself. Of course, this is only relevant if you have “direct” hands, since, otherwise, there is a high probability of increasing the cost of repair work.

Poor quality fuel

The chemical composition of low-octane gasoline includes various alcohol components. Their complete combustion requires more time than when using high-quality fuel, and accordingly this becomes the main reason for the failure of the chainsaw spark plug.

Unfortunately, many citizens naively believe that fuel containing alcohol has a positive effect on gasoline consumption and purchase fuel substitutes. In some cases, efficiency does occur, but such fuel has a negative effect on the chainsaw engine, shortening its service life.

Incorrect start

As a rule, during the first start of a chainsaw, inexperienced men miss a “pop” when the air damper is closed and continue to pull the starter. Because of this, a large amount of fuel accumulates in the combustion chamber, but there is a critical lack of air. The spark plug is filled with excess gasoline and there is no longer any spark to speak of.

Clogged filter

Due to severe contamination of the paper filter of the chainsaw, a sufficient amount of oxygen does not enter the fuel chamber. The fuel mixture does not have time to ignite and gasoline floods the spark plug. If the filter has already exhausted its service life (this will be noticeable by its appearance), then it must be replaced. If you don’t have a new filter at hand, but you still need to work, you can try blowing the filter with a reverse air flow.

Chainsaws from different manufacturers and model ranges differ from each other. To clean or change the filter, it is a good idea to first look at the instruction manual. Well, or look there if you can’t remove the filter without prompting.

Ignition system failure

Perhaps this is one of the most difficult problems that will need to be overcome in order to continue using the chainsaw. There may also be several reasons for the malfunction here.

Incorrect clearance

For the most part, the gap on the chainsaw's spark plug should be within 0.5 - 1.2 millimeters (more accurate data should be reflected in the user manual). In order to check if this is so, you need to do the following:

1. Using a screwdriver or special keys, unscrew the bolts securing the chainsaw cover.
2. Having gained access to the flywheel and magnetic core, the clearance level is checked.
3. If it does not correspond to the characteristics declared by the manufacturers, then using a special gasket or improvised means (an ordinary A4 sheet folded several times is perfect) the required distance is set.

Ignition coil problem

To make sure that the ignition coil is working properly, you need to be able to use a multimeter. This device allows you to measure the degree of resistance of the coil. A good coil will have resistance. In a burnt out one there is a break or a short circuit.

If the coil is working properly, then the gap between the coil and the flywheel may be broken. To set it up, you need to perform a number of simple steps:

1. Dismantling the saw body and loosening the bolts that secure the ignition system. The magnet (magneto) of the flywheel must be connected to the coil itself.
2. The adjusting plate is inserted between the flywheel magneto and the coil itself. The gap should be within 0.2 mm.
3. After tightening the bolts, the adjustment plate is removed.
4. It is imperative to rotate the flywheel completely and several times (2-3 will be enough). However, it should not cling to the coil.
5. The final stage is assembling the chainsaw body.

Carburetor adjustment failure

Often the spark plug on a chainsaw is flooded due to improper operation of the carburetor. For greater clarity, we recommend watching this video

If this is your first time setting up a carburetor yourself, pay attention to the following factors:

1. The presence of built-in compensators and other automatic control elements makes adjustment impossible without special equipment. In this regard, you will have to contact a specialized service center.
2. If there is no proper effect from adjusting the carburetor, the cause of flooding of the spark plug will be a stuck float or a lack of tightness of the valve.

What to do if the chainsaw picks up speed and stalls?

This situation is very similar to the previous one, the only difference is that there the chainsaw does not demonstrate high speeds at all, but here it initially produces them, but does not maintain them. Most often, a chainsaw stalls when heating up due to clogged filtration parts of the saw, as well as malfunctions of the fuel pump.

The air filter is periodically washed and dried before reinstallation, and the fuel supply hoses should be constantly checked for leaks and, if necessary, replaced with new ones. Each part has an expiration date, so you should not be surprised that the gasoline pump will no longer hold fuel and begins to leak, which is also worth taking into account when troubleshooting such equipment.

There is a spark, the spark plug is wet

First of all, it is necessary to remove the muffler and carefully inspect the piston, since this is where the problem may be hidden. but the chainsaw still does not start or stalls, the saw does not start, Partner 350. In addition, most owners wonder: why does the chainsaw start and stall, while there are supposedly no problems with the spark plugs?

But this is an erroneous opinion and you don’t need to be so sure in this case, as there are situations when the candle sparks perfectly in air, but does not work directly in the cylinder.

The reason for this may be a direct violation of a kind of compaction in the canal area (impulsive). Or so there is a peculiar development of crankshaft oil seals, but this feature occurs in very rare cases.

The Shtil ms 660 chainsaw is the most economical of the entire Shtil chainsaw line. Its price ranges from 3,100 to 5,500 rubles.

Plant structure

The first and practically main element of a chainsaw is the engine, namely a two-stroke carburetor (see carburetor adjustment). Its direct power can be varied, it all depends on the model of the device and its intended purpose.

headset (saw) which consists of a chain (cutting), bar, sprocket, wheel (chain)

It is important that it always needs to be directly selected from the specific characteristics of the engine. Why does the Stihl 180 chainsaw not start, and why does the saw not stall? Since the larger the pitch of this type of headset, the deeper the chainsaw’s cut will be, one might even say that the more powerful and productive it will be. But do not forget that for the device to fully operate, the engine should also not be inferior to it in terms of power.

Its lubrication is carried out using special oil directly from the second tank, which is located on the hand unit. It is worth noting that the mass of this type of tank has such features that the oil and fuel intended for the engine run out at the same time.

We have figured out the general outline of the device, and most likely its basis, and now it’s time to start understanding why the chainsaw stopped working, what the reasons could be for this and how to eliminate them.

Carburetor adjustment

In many ways, the service life of the structure depends on the quality of the assembly. Quite often there are problems with Chinese chainsaws associated with wear of the main elements. The low cost of the proposal is due to the use of low-quality materials.

There are several main signs that indicate that the carburetor needs to be adjusted:

1. Strong vibrations occur during work.
2. The CPG is worn out.
3. There are signs of mechanical damage to the protective cap.
4. The engine shuts down on its own or is almost impossible to start.
5. Fuel consumption and the amount of exhaust gases increase for no reason.
6. A sharp drop in power indicator.

Recommendations for adjusting the element in question are provided by the device manufacturer. As a rule, adjusting screws are placed in the protective cap, which allow you to adjust the operation of the chainsaw.

Often problems with operation arise due to changes in the settings of the fuel supply system. Safety precautions when troubleshooting carburetor problems include the absence of fuel. The entire procedure can be divided into two main stages:

1. Base.
2. Finishing.

To begin with, the position of the screws H and L is changed until they stop, after which they are turned back 1.5 turns. The final stage involves warming up the internal combustion engine for 10 minutes, since some characteristics change when heated. The adjustment is carried out using a special screw, which is set to a position to reduce the speed. The chain must be stationary.