STIHL ms 180 starts and stalls

28th October 2021

STIHL chainsaw stalls: causes

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

insufficient amount of gasoline;
poorly prepared fuel mixture;
poor quality lubrication;
muffler clogged with combustion products;
unregulated carburetor;
obstruction of the air filter;
malfunction of the piston or cylinder.

Idle speed adjustment

Before commissioning, the tool is serviced. In order for the idle speed adjustment to be effective, prevention is done:

cleaning the carburetor;
flushing the engine;
cleaning the air filter;
warming up the engine.

To adjust the operation of the mechanism at idle speed, an appropriate adjusting screw is used. Its rotation depends on the required setting:

With standard adjustment, the screw is turned against the clock hand to the point where it will turn tightly. After that, make 2 circles in the direction of the arrow.
If the saw is running at low speed, the screw is turned clockwise until the chain starts moving. Then make half a circle in the opposite direction.
At high frequency, the regulator is turned against the clock hand until the circuit stops. After that, the rotation is continued for another half turn in the same direction.

It will not work to adjust idle operation if there is air suction into the engine through a gasket, acceleration pump, oil seals, or for another reason.

The chainsaw starts and stalls: reason, video

The reason that the chainsaw can stall right after the factory lies in the malfunction of a certain part of the equipment.

The most commonplace reason why the chainsaw started up and stalled may be the low fuel level in the tank. This can be confirmed by stopping the operation of the tool when tilting, when the remaining fuel accumulates in a certain place in the fuel tank. With low-quality fuel, there may also be a problem with the operation of the chainsaw, in which case you need to completely replace it.
Breather blockage, which significantly reduces fuel consumption to the engine.
Insufficient contact of the wire cap with the plug, which leads to strong heating of the plug insulator. Deterioration of contact can occur due to mechanical shear or carbon deposits.
Broken spark plugs.
Clogged muffler, which impairs exhaust gas output, causing the engine to stop running. For this reason, the chainsaw can start and stall at idle speed. Sediment in the muffler can also appear due to poor-quality fuel or improper use of the tool.
Poor carburetor adjustment.
Breakage of the piston group
Fuel filter or pump problems. In this case, gasoline may flow through the pump or poorly flow through the fuel filter to the carburetor. As a result, the chainsaw starts up and stalls with increasing speed.
Dirty air filter. Problems with this piece of equipment lead to the fact that, with increased loads on the engine, it simply cannot cope with them due to blockage and stops. A similar result is also obtained with an increase in revolutions.
Short circuit due to lack of or insufficient lubrication, or a problem with the chain brake.

Any tool can break and the STIHL MS 180 chainsaw is no exception. Today we will try to understand such issues as: why the chainsaw stalls when the speed increases, also at idle and at full speed. Consider the options for diagnosing and eliminating malfunctions associated with this behavior of the STIHL 180 chainsaw.

Fills the spark plug

In this case, the spark is not able to ignite the fuel, which enters the furnace in large quantities to burn the combustible mixture. If it floods a candle, then the carburetor is faulty or a cold engine does not start correctly. The engine is purged, the procedure is performed with the ignition off and away from an open flame. To ensure that the fuel ignites at the time of start-up, the mechanism is cleaned:

unscrew the candle, wipe it dry, dry it for half an hour;
a large layer of carbon is removed with a file;
adjust the gap between the contacts;
the tool is turned upside down and the gasoline is drained;
in this position, pull the starter several times (to remove fuel residues);
reassemble in reverse order.

If the STIHL MC 180 chainsaw stalls at idle, does not gain power when you press the gas, or even stalls at full speed, it is necessary to diagnose the fuel system and check the crankcase for leaks. You can do it yourself, but you need to have certain skills. If you are not familiar with two-stroke saws, it is better to turn to specialists, since this technique is rather capricious and any mistakes are expensive.

The lightweight and compact model of the tool is used for domestic purposes, but despite the optimized performance, sometimes the STIHL chainsaw will not start. Problems are manifested in the fact that the engine turns on and stalls, is unstable, cannot develop the intended power, or suddenly picks up high revs.

Fuel supply

After unscrewing the candle, a wet bloom is found on its surface. This indicates an excessive supply of gasoline to the combustion chamber. For this reason, the tool does not work or stalls, since the fuel does not ignite.

Another inhibiting factor is a clogged breather. a small hole in the gas tank cap. It is cleaned with a needle, otherwise the STIHL MS 180 chainsaw will not start. To determine the incorrect fuel supply, the following steps are carried out:

remove the candle;
2 cubes of gasoline are poured into the hole of the candle with a syringe;
put the ignition device in place and put on the cap of the high-voltage wire;
the lever is moved to the hot start position;
pull the starter handle a couple of times.

If the tool starts up and immediately stalls, then the fuel line is tested further. Check the gasoline filter, splash from the engine crankcase, the integrity of the baffle in the pump when unscrewing the cover.

Why stalls at idle

The first and most common cause of this malfunction is improper carburetor adjustment. You can adjust the idle speed yourself, for this 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 STIHL 180 saw on the handle and is marked with “-” and “”.

If the STIHL chainsaw does not keep revving and stalls at idle speed, you can be almost 90% sure that it has irregularities in the fuel pump operation system, as a rule, this is air leakage into the crankcase through the oil pan gasket, or, much more often, through the oil seals crankshaft. Air leaks reduce or completely stop the impulse that is supplied through special channels to the fuel pump of the chainsaw. As a result, the STIHL 180 chainsaw does not receive the required amount of fuel and stalls at idle.

Diagnostics can be carried out using a special device called a vacuum gauge.

The second way to check the performance of the oil seals is to pour gasoline into the engine crankcase and look at them, if the oil seals pass gasoline, it means they cannot provide normal pressure in the crankcase, which will make idle work impossible. And when operating at high speeds, with leaking oil seals, there is a possibility of seizure of the crankshaft bearings.

The algorithm for checking the STIHL 180 crankcase and oil seals for leaks is as follows:

The top cover is removed.
Dismantle the air filter housing and carburetor.
The chainsaw handle is removed.
The starter spins and retracts.
On the side opposite to the starter, the side cover and the drive sprocket are removed.
A piston stopper is installed in the spark plug hole or a string from an old starter with knots imposed on 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 gear wheel of the drive of the oil pump is removed.

Having disassembled the STIHL MS 180 chainsaw, you can see the oil seals, then you need to fill the crankcase with gasoline and check the leakage. The crankcase can be filled through the fuel window in the cylinder; for this, the piston must be raised as high as possible. If leaks are found, it is necessary to replace the defective oil seals, or re-seal the pallet. You can assemble STIHL 180 following the reverse sequence of the algorithm.

When you press the gas

Sawing units are idling, but the saw stalls when the gas is pressed, as the load increases. Before use, the tool is warmed up by running the engine at idle speed for a minute. If this is neglected, the motor stops after the pedal is depressed. Other reasons could be:

clogged or unregulated combustible fuel mixing unit;
a clogged air filter does not provide the required air flow when the load increases;
a dirty gasoline filter does not pass the required amount of the mixture;
rubs the wall of the cylinder and piston.

Low octane fuel becomes the cause of the brake, since this circumstance does not allow the engine to reach the required power when the load is increased.

Why does a chainsaw stall when you press the gas

Let’s say the chainsaw works normally at idle, but when the gas is pressed sharply, it stalls. What could be the reason? It is immediately clear that this is not about the ignition (no spark), because if the ignition is faulty and there is no spark, the tool would simply not start. This means that the fuel system remains.

There are a lot of malfunctions in the fuel system and in order to determine the exact reason why the STIHL 180 chainsaw stalls when you press the gas, it is necessary to carry out its full diagnostics. We recommend reading about common malfunctions of the STIHL 180 chainsaw and their elimination.

If the STIHL MC 180 chainsaw stalls at idle, does not gain power when you press the gas, or even stalls at full speed, it is necessary to diagnose the fuel system and check the crankcase for leaks. You can do it yourself, but you need to have certain skills. If you are not familiar with two-stroke saws, it is better to turn to specialists, since this technique is rather capricious and any mistakes are expensive.

Chainsaw and kiosk launch: reason, video

The reason why the chain saw can die right after the factory is a malfunction of a certain piece of equipment.

The most common reason a chainsaw ripped open and stopped. this is a low fuel level in the tank. This can be confirmed by stopping the tool when it is tilted when fuel remains in a specific location in the fuel tank. If the fuel is of poor quality, there may also be a problem with the operation of the chainsaw, in which case it must be completely replaced.
Breathing respite, which greatly reduces engine fuel consumption.
Insufficient contact of the wire cap with the candle, which leads to strong heating of the spark plug insulator. Contact degradation can occur due to mechanical shear or carbon deposits.
Malfunctioning spark plugs.
A muffler plug that impairs the exit of exhaust gases, causing the engine to stall. For this reason, the chainsaw can start and stop at idle speed. Muffler deposits can also be caused by poor fuel quality or improper tool operation.
Poor carburetor adjustment.
Failure of the piston group
Fuel filter or pump problems. In this case, gasoline may flow through the pump or poorly pass through the fuel filter to the carburetor. As a result, the chainsaw starts and nods with increasing speed.
Dirty air filter. Problems with this piece of equipment lead to the fact that with increased engine loads, it simply cannot cope with them due to clogging and stops. A similar result is obtained with an increase in revolutions.
Chain closed due to lack or insufficient lubrication or chain brake problem.

The reasons why the chainsaw starts and stalls

STIHL MS 180 idle problem solved

A chainsaw has long been not a luxury, but a necessary tool for those who have a summer cottage or home ownership. But, like any other technique, this tool tends to fail, despite the simple device.

The classification of the main faults includes:

complete absence of engine plant
the engine starts and stalls
erratic tool performance
work stop under load
loss of power.

If the chainsaw does not start at all, the reason may be as follows:

Manufacturing defect
Lack of fuel
Problems with starting the ignition system
No spark from spark plugs
Poor fuel mixture
Carburetor clogged
High voltage wire problems
No compression.

Why chainsaw starts up and stalls, what to do in this case? It is necessary to consider in detail the reasons for this.

Why stalls at idle

The first and most common cause of this malfunction is improper carburetor adjustment. You can adjust the idle speed yourself, for this 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 STIHL 180 saw on the handle and is marked with “-” and “”.

If the STIHL chainsaw does not keep revving and stalls at idle speed, you can be almost 90% sure that it has irregularities in the fuel pump operation system, as a rule, this is air leakage into the crankcase through the oil pan gasket, or, much more often, through the oil seals crankshaft. Air leaks reduce or completely stop the impulse that is supplied through special channels to the fuel pump of the chainsaw. As a result, the STIHL 180 chainsaw does not receive the required amount of fuel and stalls at idle.

Diagnostics can be carried out using a special device called a vacuum gauge.

The algorithm for checking the STIHL 180 crankcase and oil seals for leaks is as follows:

The top cover is removed.
Dismantle the air filter housing and carburetor.
The chainsaw handle is removed.
The starter spins and retracts.
On the side opposite to the starter, the side cover and the drive sprocket are removed.
A piston stopper is installed in the spark plug hole or a string from an old starter with knots imposed on 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 gear wheel of the drive of the oil pump is removed.

Carburetor

One of the reasons why the chainsaw does not develop speed when you press the gas, but rather stall, is a carburetor malfunction. Let’s say the STIHL 180 saw worked properly, and then it was put on for a long time and did not use it. After it was started, and at idle, it works well, and when you press the gas, it can stall. Why stalls? The reason is a sticky carburetor injector valve. Of course, this is not 100%, but the probability of such a malfunction is high. We recommend reading an article about the device and repair of the STIHL 180 carburetor.

In order to check the injector, it is necessary to remove the carburetor and disassemble it. To remove, it is necessary 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 choke control rod from the carburetor. Next, you need to pull the carburetor slightly towards you, and disconnect the fuel supply hose.

It is necessary to remove the fuel hose as carefully as possible, and prepare a plug for it in advance, since fuel should come from it.

Having removed the carburetor, it must be blown out and cleaned of dirt, only after that the carburetor can be unscrewed.

It is necessary to unscrew the cover of the main chamber of the carburetor, this is the one on which the compensator is installed on top. Further, using a bolt of 8 mm and a length of at least 50 mm. Knock out the valve.

It is necessary to knock out the valve by installing the carburetor on a wooden stand, this will ensure its protection from damage to the body.

After the nozzle is removed, you can blow it out with a compressor. The valve should only let air through in one direction, if the valve can be freely blown in both directions, then it is defective and must be replaced with a new one. Collect the chainsaw after the valve is repaired, it is necessary to follow the reverse sequence of disassembly.

stihl ms180c that wont idle and runs rough watch this

You can clearly see how the carburetor is being repaired, or rather how to properly knock out the nozzle valve from the carburetor body by watching the video.

Another common reason a saw can stall when revving up is air leaks into the carburetor. It is possible to check this only with a special tool, but it is worth noting that if preventive work on the carburetor has not been carried out for a long time, then a new set of gaskets can be installed in the carburetor. In some cases, this helps to solve the problem with its depressurization.

When disassembling the carburetor to replace the gaskets, you need to carefully inspect its needle valve, press the rocker arm and check its lifting. Sometimes, especially after the STIHL chainsaw has stood for a long time with fuel in the carburetor, the needle may burn to the carburetor body and not perform its functions. Simply put, the needle valve will not allow the fuel mixture to pass through. In this case, the saw will not work.

Why stalls at full speed

Very often you can hear the question why the chainsaw stalls at full speed. There may be several reasons. First, you need to consider how the saw stalled. Suppose the tool worked fine and suddenly, for no apparent reason, it suddenly stalled and the starter did not turn. In such a situation, you can be 100% sure that the chainsaw is jammed and you need to start its overhaul.

The second situation is when the STIHL 180 chainsaw worked normally, then gradually lost power in a short time and stalled, while the cylinder overheated. In this case, most likely the reason is air leaks under the rubber pipe connecting the carburetor to the cylinder or its rupture. The mixture was depleted, resulting in overheating. You can eliminate the cause by changing the branch pipe.

Filter check

The first thing to check is the fuel filter.

In some cases, a filter clogged with dirt is unable to pass enough fuel mixture through it. Accordingly, a fuel shortage arises 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 have time to enter yet, as a result of which the STIHL chainsaw stalls. Also, with a clogged fuel filter, there may be a noticeable drop in the power of the chainsaw at maximum speed, but this is with insignificant contamination.

Filter check

The first thing to check is the fuel filter.

In some cases, a filter clogged with dirt is unable to pass enough fuel mixture through it. Accordingly, a fuel shortage arises 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 have time to enter yet, as a result of which the STIHL chainsaw stalls. Also, with a clogged fuel filter, there may be a noticeable drop in the power of the chainsaw at maximum speed, but this is with insignificant contamination.

Why stalls at idle

If the STIHL chainsaw does not keep revving and stalls at idle speed, you can be almost 90% sure that it has irregularities in the fuel pump operation system, as a rule, this is air leakage into the crankcase through the oil pan gasket, or, much more often, through the oil seals crankshaft. Air leaks reduce or completely stop the impulse that is supplied through special channels to the fuel pump of the chainsaw. As a result, the STIHL 180 chainsaw does not receive the required amount of fuel and stalls at idle.

Stihl ms 170 bogs down, stalls out when starting

Diagnostics can be carried out using a special device called a vacuum gauge.

The algorithm for checking the STIHL 180 crankcase and oil seals for leaks is as follows:

The top cover is removed.
Dismantle the air filter housing and carburetor.
The chainsaw handle is removed.
The starter spins and retracts.
On the side opposite to the starter, the side cover and the drive sprocket are removed.
A piston stopper is installed in the spark plug hole or a string from an old starter with knots imposed on 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 gear wheel of the drive of the oil pump is removed.

Having disassembled the STIHL MS 180 chainsaw, you can see the oil seals, then you need to fill the crankcase with gasoline and check the leakage. The crankcase can be filled through the fuel window in the cylinder; for this, the piston must be raised as high as possible. If leaks are found, it is necessary to replace the defective oil seals, or re-seal the pallet. You can assemble STIHL 180 following the reverse sequence of the algorithm.

Air filter

On the pages of the world wide web, you can find information that the STIHL 180 chainsaw can stall due to a strong contamination of the air filter. I would like to refute this not entirely correct information, and report that the STIHL MC 180 carburetor is equipped with an expansion joint, which is designed and installed in order to take in the air necessary for the normal operation of the STIHL 180 chainsaw, bypassing the contaminated air filter. Of course, the power with a clogged air filter will drop a little, but it will definitely not stall. The power may also drop due to wear of the piston, here it will already be necessary to repair the STIHL MS 180 piston chainsaw.

Why does a chainsaw stall when you press the gas

There are a lot of malfunctions in the fuel system and in order to determine the exact reason why the STIHL 180 chainsaw stalls when you press the gas, it is necessary to carry out its full diagnostics. We recommend reading about common malfunctions of the STIHL 180 chainsaw and their elimination.

Carburetor

It is necessary to remove the fuel hose as carefully as possible, and prepare a plug for it in advance, since fuel should come from it.

Having removed the carburetor, it must be blown out and cleaned of dirt, only after that the carburetor can be unscrewed.

It is necessary to knock out the valve by installing the carburetor on a wooden stand, this will ensure its protection from damage to the body.

You can clearly see how the carburetor is being repaired, or rather how to properly knock out the nozzle valve from the carburetor body by watching the video.

Why stalls at full speed

The second situation is when the STIHL 180 chainsaw worked normally, then gradually lost power in a short time and stalled, while the cylinder overheated. In this case, most likely the reason is air leaks under the rubber pipe connecting the carburetor to the cylinder or its rupture. The mixture was depleted, resulting in overheating. You can eliminate the cause by changing the branch pipe.

For what reasons STIHL 180 stalls at idle or full throttle

Sources:

http://prodistillyat.ru/info/pila-shtil-180-zavoditsja-i-glohnet/
http://benzopilok.ru/brend/STIHL/ms-180-glohnet-na-holostom-polnom-hodu.html

Articles stalls, starts, stihl