The petrol trimmer stalls at high speeds. The trimmer stalls: causes and troubleshooting

The chainsaw starts and stalls. Why?

There are several simple rules for operating and maintaining a chainsaw, compliance with which will maximize its service life. Preparing the correct fuel mixture, regularly cleaning filters and periodically replacing parts will save you from the need to repair your tool for a long time. If it was not possible to avoid a breakdown, then you can figure out its cause completely on your own. This applies to any brands of chainsaws, from the more complex Husqvarna and Shtil models to the simplest Makita and Patriot models.

The chainsaw immediately stalls

What to do if the chainsaw stalls immediately after starting? First you need to check the presence of fuel in the gas tank. If its level is not sufficient, then you need to prepare the fuel mixture in strict accordance with the ratio of gasoline and oil prescribed in the operating instructions. Gasoline must have the highest possible octane number, and the required brand of oil is usually indicated in the chainsaw’s data sheet.

Next, we check the spark plug, as well as the contact of its tip with the high-voltage wire. The gap between them should be no more than 0.5 mm. If necessary, the candle is cleaned of carbon deposits and dried. It is recommended to occasionally change the spark plug to a completely new one. The reasons why the tool stalls when you press the gas lie in the fuel filter or carburetor jet. Cleaning the gas filter will not take much time and effort, but it is better to entrust the disassembly and cleaning of the carburetor to the service center specialists.

Chainsaw stalls at idle

There are common cases when a chainsaw stalls at idle. First of all, you need to check the muffler, and, if it is dirty, clean it from exhaust tar deposits. Also on carburetors of some models and others there are bolts marked H and L - coarse and fine adjustment, respectively. By adjusting the bolt L while the chainsaw is running so that its speed increases (turning the bolt only half a turn is enough), it is possible to eliminate this problem. Adjusting the carburetor requires an electronic tachometer and is a rather labor-intensive process. That is why in such cases it is better to turn to professionals.

Chainsaw stalls under load

If the chainsaw stalls under load, the cause may be the fuel system or a dirty air filter. Changing the fuel while maintaining the correct gasoline/oil ratio or cleaning the air filter are universal solutions to this problem. An incorrectly prepared mixture of low-quality gasoline and, for example, machine oil is the main reason for the malfunction of a chainsaw, including when it heats up and stalls.

Chainsaw stalls when tilted

When the chainsaw is in a horizontal position, the fuel tube lies at the bottom of the gas tank, but when the tool is tilted, the tube is above the fuel mixture, i.e. in the airspace. This is precisely the reason why a chainsaw stalls on its side.

Chainsaw stalls at high speeds

If the tool stalls at high speeds, you need to check three parts: the air filter, the fuel pump and the gasoline filter. The air filter needs to be cleaned, you can even wash it under water and dry it thoroughly. Then just disconnect the fuel hose from the carburetor and see whether fuel flows out of it or not. If it flows in a full stream, the gasoline filter does not need to be checked. If on the contrary, then a fault has been found. The breather can be cleaned with a regular needle, and the filter can be carefully disconnected from the suction hose, cleaned, or replaced with a new one. The gasoline pump is checked for wear: if fuel does not leak through it, then everything is fine with it. If the problem that your tool stalls at full speed is due to some damage to the pump, then this part simply needs to be replaced with a new one.

Stihl Ms 180 Stalls at Idle

Any tool can break, and the Stihl MS 180 chainsaw is no exception. Now let’s try to understand questions such as: why does the chainsaw stall when the speed increases, also at full idle. Let's look at options for diagnosing and eliminating defects associated with this behavior of the Shtil 180 chainsaw.

Let's say the chainsaw works normally at idle, but when you press the gas sharply, it stalls. What is the reason you will like? It’s immediately clear that the problem is not the ignition (lack of spark), because if the ignition was faulty and there was no spark, the tool simply would not start. This means the fuel system remains.

There are enough defects in the fuel complex of accounting programs, and in order to determine a clear reason why the Shtil 180 chainsaw stalls when you press the gas, you need to carry out a full diagnosis of it. We advise you to read about the most common malfunctions of the Shtil 180 chainsaw and the elimination of these defects.

The first thing you need to check is the fuel filter.

Sometimes, a filter clogged with dirt is unable to pass through the fuel mixture in sufficient quantities. Accordingly, a lack of fuel appears in the system, which leads to the fact that when you press the gas of the chainsaw, the fuel burns out, and the new one does not yet have time to arrive and, as a result, the Shtil chainsaw stalls. Also, if the fuel filter is clogged, there may be a noticeable drop in the power of the chainsaw at high speeds, alas, this is with minor contamination.

On the Internet, you will find information that the Shtil 180 chainsaw may stall due to severe contamination of the air filter. I would like to refute this incorrect information and say that the Shtil MC 180 carburetor is equipped with a compensator, which is designed and installed to take in the air necessary for the normal operation of the Shtil 180 chainsaw, bypassing the dirty air filter. This power with a clogged air filter will drop slightly, alas, it will definitely not stall. The power may also drop due to piston wear; here the Stihl MS 180 piston chainsaw will need to be repaired.

Stihl chainsaw. Repair. Idle speed adjustment. In artisanal conditions. Traders are silent about this fact.

READ How to Set the Ignition on a Stihl 180

One of the reasons why a chainsaw does not develop speed when you press the gas, but instead stalls, is a malfunction of the carburetor. Let’s say the Shtil 180 saw worked properly, but at the end it was installed for a long time and was not even used. After starting it, it works fine at idle, but when you press the gas it can stall. Why does it stall? The reason is a stuck carburetor valve nozzle. This is not 100%, but the possibility of such a malfunction is extremely high. We recommend reading the article about the design and repair of the Shtil 180 carburetor.

If you set a goal to check the nozzle, you need to remove the carburetor and disassemble it. To remove, you need to unscrew the two nuts securing the air filter and the carburetor, after completion, remove the air filter and the engine control lever, while disconnecting the air damper control rod from the carburetor. Next, you need to slightly pull the carburetor towards you only and disconnect the fuel supply hose.

It is necessary to very carefully remove the fuel hose, and prepare a plug here in advance, since with its use fuel should come out.

Having removed the carburetor, it must be blown out and cleaned of dirt, only after which the carburetor must be untwisted.

You need to unscrew the cover of the main chamber of the carburetor; this is the one on which the compensator is installed on top. Next, use an 8 mm bolt and a length of more than 50 mm. We knock out the valve.

You need to knock out the valve by placing the carburetor on a wooden stand, this will protect it from damage to the body.

When the nozzle is removed, you can blow it out using a compressor. The valve must allow air to flow exclusively in one direction; if the valve can be freely blown in both directions, it means it is faulty and needs to be replaced with a new one. If the valve has been repaired, you must reassemble the chainsaw in the reverse order of disassembly.

To see clearly how a carburetor is repaired, or more precisely, how to correctly knock out the injector valve from the carburetor body, of course, watch the video.

Another common reason why a saw may stall when the speed increases is air leaking into the carburetor. You can check this only with a special tool, but it is worth seeing that if preventative work on the carburetor has not been carried out for a long period, then you can install a new set of gaskets in the carburetor. Sometimes this helps solve the problem of its depressurization.

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When disassembling the carburetor to change the gaskets, you need to closely examine its needle valve, press on the rocker arm and check its lifting. If, especially if the Stihl chainsaw stood for a long period with fuel in the carburetor, the needle may burn to the carburetor body and not do its intended purpose. Simply put, the needle valve will not allow the fuel mixture to pass through. Under such circumstances, the saw does not work.

The first and most common cause of this malfunction is incorrect carburetor adjustment. You can adjust the idle speed yourself; for this purpose you need to have a Stihl adjusting screwdriver, which is supplied with the unit. The adjustment hole is located on the right side of the Shtil 180 saw on the handle and is marked with the signs “-” and “”.

If the Stihl chainsaw does not maintain speed and stalls at idle, there is actually a 90% certainty that it has a malfunction in the fuel pump operating system, usually this is air leaking into the crankcase through the pan gasket, in other words, much more often, through the crankshaft oil seals shaft The air intake reduces or completely stops the impulse, which is supplied through special channels to the fuel pump of the chainsaw. Upon completion of this, the Stihl 180 chainsaw does not receive the required amount of fuel and stalls at idle.

Conduct diagnostics, of course, using a special device called a vacuum gauge.

The second method to check the performance of the oil seals is to pour gasoline into the engine crankcase and see if the oil seals allow gasoline to pass through, which means they are providing normal pressure in the crankcase, which will make idling impossible. And when operating at high speeds, with leaky oil seals, it is possible for the crankshaft bearings to jam.

The method for checking the crankcase and seals Shtil 180 for tightness is as follows:

The top cover is removed.
The air filter housing and carburetor are dismantled.
The chainsaw handle is removed.
The starter spins up and retracts.
The side cover and drive sprocket are removed from the side opposite the starter.
A piston stopper is installed in the spark plug hole or a string from an old starter with knots tied to it is stuffed into the cylinder.
The flywheel and clutch are unscrewed, after which the parts are removed. It is worth knowing that the chainsaw clutch has a left-hand thread and unscrews clockwise.
The oil pump drive gear is removed.

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Having disassembled the Stihl MS 180 chainsaw, you can notice the oil seals, after which you need to fill the crankcase with gasoline and check for leaks. Fill the crankcase, of course, through the fuel window in the cylinder; for this purpose you need to raise the piston very high. If leaks are detected, you need to replace the defective seals or re-seal the pan. There is an option to assemble Shtil 180 by following the reverse sequence of the method.

We often hear the question why a chainsaw stalls at full speed. You will like more than one circumstance. That's all, you need to take into account exactly how the saw stalled. Let’s say the tool was working normally and suddenly, for no apparent reason, it suddenly stalled and yet the starter does not turn over. Under these circumstances, of course, be 100% sure that the chainsaw is jammed and it is necessary to begin serious repairs.

What to do if the chainsaw does not idle?

Another situation is when the Shtil 180 chainsaw was working normally, then gradually over a short period of time it lost power and stalled, at the same time the cylinder overheated. Then, most likely the reason is air leakage under the rubber pipe connecting the carburetor to the cylinder or its rupture. The mixture became lean, resulting in overheating. You can remove the cause by changing the pipe.

If the Shtil MC 180 chainsaw stalls at idle, does not gain power when you press the gas, or even stalls at full speed, you need to diagnose the fuel system (software) and inspect the crankcase for tightness. There is an option to do this without the help of others, but you need to have certain abilities. If you are familiar with push-pull saws, it is better to turn to specialists, because this technique is quite capricious and any mistakes are expensive.

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Calm Chainsaw High Idle Speed

Content

For what reasons does Shtil 180 stall at idle or full throttle?

Any tool can break, and the Stihl MS 180 chainsaw is no exception. Now let’s try to understand questions such as: why does the chainsaw stall when the speed increases, also at idle . Let's look at options for diagnosing and eliminating defects associated with this behavior of the Shtil chainsaw

180.

Why does a chainsaw stall when you press the gas?

Let's say the chainsaw operates normally at idle, but when you press the gas sharply it stalls. What is the possible reason? It’s immediately clear that the problem is not the ignition (lack of spark), because if the ignition was faulty and there was no spark, the tool simply would not start. This means the fuel system remains.

There are many defects in the fuel system that allows for accounting (software), and in order to determine a clear reason why the Shtil 180 chainsaw stalls when you press the gas, you need to carry out a full diagnosis of it. We advise you to read about the most common faults of the Shtil chainsaw

180 and eliminating these defects.

Filter check

The first thing you need to check is the fuel filter.

Air filter

On the Internet, you can find information that the Shtil 180 chainsaw may stall due to severe contamination of the air filter. I would like to refute this incorrect information and say what it really is, that the Shtil MC 180 carburetor is equipped with a compensator, which was designed and installed if you set a goal to take in the air needed for the normal operation of the Shtil 180 chainsaw, bypassing the dirty air filter

. Naturally, the power with a clogged air filter will drop a little, but it definitely won’t stall. The power may also drop due to piston wear; here the Stihl MS 180 piston chainsaw will need to be repaired.

READ Chainsaw Makita Dcs 34 40 Video

Carburetor

One of the reasons why a chainsaw does not develop speed when you press the gas, but rather stalls, is a malfunction of the carburetor. Let’s say the Shtil 180 saw worked properly, and after it was installed, it was not used for a long time. After starting it, it works fine at idle, but when you press the gas it can stall. Why does it stall? The reason is a stuck carburetor valve nozzle. Naturally, this is not 100%; unfortunately, the possibility of such a malfunction is extremely high. We recommend reading the article about the design and repair of the Shtil 180 carburetor.

If you set a goal to check the nozzle, you need to remove the carburetor and disassemble it. To remove, you need to unscrew the two nuts securing the air filter and the carburetor, then remove the air filter and the engine control lever, while disconnecting the air damper control rod from the carburetor. Next, you just need to slightly pull the carburetor towards you and disconnect the fuel supply hose.

It is necessary to very carefully remove the fuel hose, and prepare a plug here in advance, since with its use fuel must flow.

Having removed the carburetor, it must be blown out and cleaned of dirt, only after this there is an option to unwind the carburetor.

Chainsaw Stihl MS 180 tasks with speed

Chainsaw Stihl

The MS 180 has certain aspects that make owners worry and is expensive.

The Calm 180 MS does not slow down.

With the carburetor screw turned to zero, huge revolutions

.Change bearings and seals.

You need to knock out the valve by placing the carburetor on a wooden stand, this will protect it from damage to the body.

When the nozzle is removed, you can blow it out using a compressor. The valve must allow air to flow exclusively in one direction; if, of course, the valve is free to blow in both directions, it means it is faulty and needs to be replaced with a new one. If the valve has been repaired, you must reassemble the chainsaw in the reverse order of disassembly.

READ Chainsaw Goodluck won't start

You can clearly see how a carburetor is repaired, or more precisely, how to correctly knock out the injector valve from the carburetor body by watching the video.

The next common reason why a saw may stall when the speed increases is air leaking into the carburetor. This can only be checked with a special tool, but it is worth seeing that if preventative work on the carburetor has not been carried out for more than one year, then there is an option to install a new set of gaskets in the carburetor. Sometimes this helps solve the problem of its depressurization.

When disassembling the carburetor to change the gaskets, you need to closely examine its needle valve, press on the rocker arm and check its lifting. From time to time, especially if chainsaw has been standing for a long time with fuel in the carburetor, the needle may burn to the carburetor body and not do its intended purpose. Simply put, the needle valve will not allow the fuel mixture to pass through. Here, the saw doesn't work.

Why does it stall at idle?

The first and most common cause of this malfunction is incorrect carburetor adjustment. Of course, you can adjust the idle speed without the help of others; for this purpose you need to have a Stihl adjusting screwdriver, which is supplied with the unit. The adjustment hole is located on the right side of the Shtil 180 saw on the handle and is marked with the signs “-” and “”.

If the Stihl chainsaw does not maintain speed and stalls at idle , you can be virtually 90% sure that it has a malfunction in the fuel pump operating system, usually this is air leaking into the crankcase through the pan gasket, or, more often, through the crankshaft oil seals. The air intake reduces or completely stops the pulse, which is supplied through special channels to the fuel pump of the chainsaw. Upon completion of this, the Stihl 180 chainsaw does not receive the required amount of fuel and stalls at idle.

Conduct diagnostics, of course, using a special device called a vacuum gauge.

The second method to check the performance of the oil seals is to pour gasoline into the engine crankcase and see if the oil seals allow gasoline to pass through, which means they are providing normal pressure in the crankcase, which will make idling impossible. And during operation at high speeds, with leaky oil seals, there is a possibility of jamming of the crankshaft bearings.

READ Why the Petrol Trimmer Doesn't Gain Speed

The method for checking the crankcase and seals Shtil 180 for tightness is as follows:

The top cover is removed.
The air filter housing and carburetor are dismantled.
The chainsaw handle is removed.
The starter spins up and retracts.
The side cover and drive sprocket are removed from the side opposite the starter.
A piston stopper, as it is also called, is installed in the spark plug hole; a cord from an old starter with knots tied to it is stuffed into the cylinder.
The flywheel and clutch are unscrewed, after which the parts are removed. It is worth knowing that the chainsaw clutch has a left-hand thread and unscrews clockwise.
The oil pump drive gear is removed.

Having disassembled the Stihl MS 180 chainsaw, we find the seals; after this fact, you need to fill the crankcase with gasoline and check for leaks. Fill the crankcase, of course, through the fuel window in the cylinder; for this purpose the piston must be raised very high. If leaks are detected, the defective seals need to be replaced, in other words, the pan must be sealed again. You can assemble Shtil 180 by following the reverse sequence of the method.

Why does it stall at full speed?

We often hear the question why a chainsaw stalls at full speed. There may be several circumstances. That's all, you need to take into account exactly how the saw stalled. Let's say the tool was working normally and suddenly, without apparent circumstances, it suddenly stalled and in this case the starter does not turn over. Under these circumstances, there is an option to be 100% sure that the chainsaw is jammed and it is necessary to begin serious repairs.

The second situation is when the Shtil 180 chainsaw was working normally, then gradually over a short period of time it lost power and stalled, while overheating of the cylinder was observed. Then, most likely the reason is air leakage under the rubber pipe connecting the carburetor to the cylinder or its rupture. The mixture became lean, resulting in overheating. Remove the cause, of course, by changing the pipe.

Conclusion

If the chainsaw is Stihl

The MC 180 stalls at idle, does not gain power when you press the gas, or even stalls at full speed, you need to diagnose the fuel accounting system and inspect the crankcase for tightness. You can do this without the help of others, but you need to have certain abilities. If you are not very familiar with push-pull saws, it is better to turn to specialists, since this technique is quite capricious and any mistakes are expensive.

Source