Stihl 180 Stalls At Full • CIMFLOK.COM

At least some tools can break and the Stihl MS 180 chainsaw is no exception. Now let’s try to understand issues such as: why the chainsaw stalls with an increase in speed, also at idle at full speed. We will examine the options for diagnosing and eliminating defects associated with this behavior of the Stihl 180 chainsaw.

Suppose a chainsaw normally idles, but with a sharp pressure on the gas stalls. What is the possible reason? It is immediately clear that it is not a matter of ignition (the absence of a spark), because if there was a malfunction in the ignition and the absence of a spark, the tool would simply not start. Means fuel system remains.

There are enough defects in the fuel complex of accounting programs and also to determine a clear premise why the Stihl 180 chainsaw stalls when you press the gas, you need to carry out its full diagnosis. We advise you to read about the widespread malfunctions of the Stihl 180 chainsaw and the elimination of these defects.

The first thing to check is the fuel filter.

Sometimes, a clogged filter 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 on the chainsaw, the fuel burns out, and the new one does not have time to arrive and as a result the Stihl chainsaw stalls. Also, with a clogged fuel filter, a noticeable drop in the power of the chainsaw at the highest revolutions can be observed, but this is with minor pollution.

On the pages of the Internet, it is possible to find information that the Stihl 180 chainsaw may stall due to severe pollution of the air filter. I would like to refute this incorrect information, and say that the Stihl MC 180 carburetor is equipped with a compensator that is designed and installed to take the air necessary for the normal operation of the Stihl 180 chainsaw, bypassing the dirty air filter. Naturally, power with a clogged air filter will fall a little, but it certainly will not stall. Still, the power may fall due to piston wear, the Stihl MS 180 piston chainsaw will already need to be repaired.

Idle of the STIHL MS 1800 chainsaw. The chainsaw stalls and the speed cannot be adjusted

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One of the reasons, because of which the chainsaw does not develop momentum when you press the gas, but instead stall, is a carburetor malfunction. Let’s say the Stihl 180 saw worked properly, and then it was put on a long term and did not even use it. After it was started, at the same time it works perfectly at idle, and when it is pressed on the gas, it can stall. Why does it stall? The reason is a stuck carburetor valve nozzle. This, this is not 100%, alas, the possibility of such a malfunction is the highest. We advise you to read an article about the device and repair of the Stihl 180 carburetor.

In order 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, in this case disconnecting the throttle control rod from the carburetor. Further it is necessary to slightly pull the carburetor only towards you, and disconnect the fuel supply hose.

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

After removing the carburetor, it must be purged and cleaned of dirt, only after a while, of course, untwist the carburetor.

You need to untwist the cover of the main carburetor chamber, this is the one on which the compensator is installed on top. Then with a bolt of 8 mm and a length of more than 50 mm. We 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 against damage to the body.

If the nozzle is removed, of course blow it off using a compressor. The valve must allow air to flow in only one direction, unless of course the valve is freely blown to both states, which means it is faulty and needs to be replaced with a new one. If the valve is repaired, it is necessary to assemble the chainsaw in compliance with the reverse disassembly sequence.

To see clearly how the carburetor is being repaired, and more precisely how to knock the valve-nozzle out of the carburetor body, of course, by watching the video.

The next common reason why the saw may stall with increasing speed, air intake in the carburetor. You can only check this with a special tool, but it is worth seeing that if preventive work with the carburetor has not been carried out for more than one year, then you can install a new set of gaskets in the carburetor. Sometimes this helps to solve the problem with its depressurization.

When disassembling a carburetor for changing gaskets, it is necessary to carefully examine its needle valve, press on the rocker arm and control its lifting. From time to time, especially when the Stihl chainsaw has stood for a long period with fuel in the carburetor, the needle may burn to the carburetor body and not even do its job. Simply put, the needle valve will not let the fuel mixture through. Then, the saw doesn’t work.

The first and most common cause of this malfunction is the incorrect carburetor adjustment. You can adjust the idle speed without the help of others, for this purpose you need to have a Stihl adjustment 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 indicated by the signs “-” and “”.

If the Stihl chainsaw does not maintain speed and stalls idling, you can actually have 90% doubt that it has a violation in the fuel pump system, it is usually air leaking into the crankcase through the gasket of the sump, as it is also called, which is much more common through oil seals crankshaft. Air suction lowers as it is also called. In general, it completely stops the impulse that 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.

help. a chainsaw when it runs on a load for 10 seconds, then the speed drops sharply for a second and then again it works for 2-5 seconds and then the speed drops again. the carburetor disassembled purged everything clean, also the filter is clean and air and fuel. the cold starts up normally.

Jpeg wrote:
I ask for advice. Stihl ms 180 stalls. At idle. When the throttle lever is reset, it first smoothly slows down, then it starts to work unstably with twitching, and then stalls after an indefinite time. After that, it is problematic to start. If giving in to gas is better! If you put the saw on its side (at any), the idle speed increases almost to those at which the chain starts to spin on the tire and the saw does not stall. What can give such an effect? What I’ve already done: I replaced the spark plug, cleaned the air filter to the ideal, and put in a new gas filter. I went through the entire saw, looked through all the areas where there could be air leakage, checked the gas hose for leaks, disassembled and blew the carburetor with air from the compressor, looked at the condition of the membranes. They are whole, slightly growing up. Changed the crankshaft oil seals. Put them on Permatex sealant. I tried to run without a top cover, bypassing the air filter completely. He opened the gas tank on a working saw. Nothing helps. What points attracted attention: on the cylinder and on the piston there are scuffs, but not very deep ones. The landing hole of the air damper axis is broken, because before me someone lost the lock washer. There is a backlash of about half a millimeter. The throttle is sitting tight. A candle quickly clogs with soot when working at idle. In general, compared to Husqwarna 137, gasoline is consumed twice as fast. It seems that carb is rich. Where else can I get in, what to see? Or, after all, the whole problem is badass.

you need to look for what badass. in this unit they appear for a reason

The chainsaw stalls at idle: many owners of this tool face this problem. According to its device, it drank a rather simple tool. But there are times when it fails. The main problem in troubleshooting is determining the correct cause for abnormal operation.. Once the cause has been identified, repairing the defect is usually quite simple.

Chainsaw device diagram.

Probable Reasons for Failure

The power unit of all chainsaws is a single cylinder internal combustion engine. For devices of this type, malfunctions such as a violation within the cylinder compression, a change in the ratio of the fuel mixture, incorrect ignition, poor-quality fuels and lubricants are typical. The main problems in the operation of the power unit are as follows:

the engine runs stably at minimum speed, but stalls with increasing speed;
start-up is normal, and idle is unstable, quickly stalls;
does not start.

Chainsaw electronic ignition circuit.

Abnormal idling can be caused by various reasons. They can be divided into several positions:

reduced filter capacity (gasoline and air);
abnormal operation of the ignition system:
carburetor settings have changed spontaneously;
malfunction of the elements of the gas pipeline;
clogged exhaust ducts, silencer;
defects of the piston, cylinder, valves.

Repair must begin with an external inspection and check for fuel in the tank.

Check and repair filters

The engine may malfunction or stall when there is insufficient fuel or air. Reasons. clogged air or fuel filter. To check the fuel filter, it is necessary to remove the hose of the gas line from the carburetor fitting and direct it to some container. Then press the fuel pump several times. If the fuel is pumped normally, in clearly expressed doses, without dirt, then the fuel filter is working. If the jet is weak or fuel is not pumped at all. the filter must be replaced or cleaned if possible.

Clogging the fuel filter with sawdust is one of the reasons for a chainsaw breakdown.

The device must be removed from the fuel tank (after draining all fuel from it). In most models, the fuel filter can be hooked out of the wire through the neck. If the filter design is collapsible and can be cleaned, disassemble and rinse in accordance with the manufacturer’s recommendations. In another case, change to a new filter.

Similar problems can occur when the air filter is clogged with dust, sawdust, or dirt. If there is not enough air, the fuel mixture will be enriched, the process of burning fuel is difficult.

To check, remove the filter. When working, you need to take precautions so that dust does not enter the carburetor. The device must be cleaned and rinsed in warm water with the addition of detergent. After drying, if possible, blow with low-pressure compressed air, replace. If the chainsaw works fine, then the reason is eliminated, if not, you need to look further.

With constant use of the tool, it is recommended to replace the filters of the fuel and air systems after 3 months.

Checking the spark plug and ignition system

According to the recommendations of manufacturers, the spark plug should be changed annually, regardless of the intensity of operation of the tool. Failure to comply with these tips leads to a completely logical result: failures at idle, subsequent failure.

Typical defects in the ignition system are as follows:

Faulty chainsaw candles.

The candle was filled with fuel at the time of launch. It is necessary to remove it from the nest, dry it, and, if possible, blow it with compressed air. Drain the remaining fuel from the cylinder through the mounting hole, blow it off with compressed air. Then install the candle, connect the high-voltage wire, start.
No spark on the electrodes of the candle. It is necessary to disconnect the high-voltage wire and check for a spark on it. If the spark is normal, check the connection, eliminate any defects found. The absence of sparks on the high-voltage wire indicates a malfunction of the ignition unit. This device cannot be repaired; it is necessary to exchange it for a new one.
The gap between the spark plug electrodes has been violated. This parameter for various types of devices can be in the range from 0.2 to 0.5 mm. Check and adjustment must be carried out using a special probe or caliper. The required value can be found in the instruction manual of the tool.
By the appearance of the candle, you can determine the direction of the search. If the candle turns out to be dry after several attempts to start the engine, then gasoline does not enter the cylinder. Check fuel supply system and carburetor.
The presence of black carbon deposits or black deposits on the electrodes indicates improper carburetor adjustment or an air filter clogging. Possibly low-quality fuel with a high oil content is used. During normal operation of the ignition system, the electrodes have a uniform gray color and a brown coating on the insulators.

Video: Stihl 180 Stalls At Full

Check and repair carburetor

The principle of operation of the carburetor chainsaw.

If checking the ignition system, fuel filters, muffler did not give tangible results, the tool still does not want to work at minimum speed, you need to check the carburetor.

To adjust the operating modes on the device body are three screws designed to set the minimum rotation speed, maximum speed and idle speed.

On many models, manufacturers install only the idle adjustment screw to avoid incompetent attempts to adjust the device. In all versions of the device, the adjustment must be performed exactly according to the recommendations of the manufacturers.

If the adjustment of the device did not lead to the restoration of the normal operability of the tool, it is necessary to completely disassemble the device with inspection. It should be understood that the carburetor is a rather complex device, in the absence of experience it is advisable to consult specialists.

When disassembling, it is important to carefully inspect and flush all jets, air and fuel channels, and the filter screen. Damaged items must be replaced with new ones. The jets must be cleaned with a soft wire of the appropriate diameter.

It is advisable to carry out the work in appropriate conditions. The carburetor contains many small parts, the loss of any of them will make the device inoperative.

Check and repair the muffler

Clogged silencers should be left to soak in warm water with detergent, then wiped and dried thoroughly.

A muffler malfunction leads to a drop in the power of the tool during operation and stops in idle mode. Despite the apparent simplicity of this part, it is also important to monitor it. Quite often, the silencer is clogged. When working, it is possible that wood dust, sawdust, and resin particles get on the grate. High temperature contributes to their adhesion and accumulation, exhaust gases also form deposits on the surfaces of the spark arrester and other parts. Increasing over time, the layer reduces the capacity of the silencer and interferes with the normal removal of exhaust gases. The engine, figuratively speaking, is suffocating.

Repair of this unit is not difficult, quite possible for many tool owners. The device should be removed from the engine, cover the holes with a rag or other material. If the resulting layer is too hard, all parts can be left to soak in warm water with a detergent. After plaque softening, the parts should be washed with a rag or soft brush and wiped thoroughly. Inaccessible places can be blown with compressed air or blow dry. The use of mechanical means of removal is undesirable.

For the muffler to function normally over a long period of use, lubricants recommended by the manufacturer should be used, monitoring their expiration dates. The mixture must be prepared immediately before work and completely consumed.

Conclusion on the topic

Chainsaws, like most tools, require timely maintenance and care.

Failure to comply with this rule leads to tool failure, material costs, loss of precious working time at the most inopportune moments.

Any tool can break and the Stihl MS 180 chainsaw is no exception. Today we’ll try to understand issues such as: why the chainsaw stalls at an increase in speed, also at idle and at full speed. Let’s consider the options for diagnosing and troubleshooting related to this behavior of the Stihl 180 chainsaw.

Why the chainsaw stalls when you press the gas

Suppose a chainsaw normally idles, but with a sharp pressure on the gas stalls. What could be the reason? It is immediately clear that it is not a matter of ignition (the absence of a spark), because if there was a malfunction in the ignition and the absence of a spark, the tool would simply not start. So the fuel system remains.

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

Filter check

The first thing to check is the fuel filter.

In some cases, a dirt-clogged filter is unable to pass through the fuel mixture in sufficient quantities. Accordingly, there is a fuel shortage in the system, which leads to the fact that when you press the gas on the chainsaw, the fuel burns out, and a new one does not have time to arrive, as a result of which the Stihl chainsaw stalls. Also, with a clogged fuel filter, a noticeable drop in the power of the chainsaw at maximum speeds may be observed, but this is with little pollution.

Air filter

On the pages of the World Wide Web, you can find information that the Stihl 180 chainsaw may stall due to severe contamination of the air filter. I would like to refute this not entirely correct information, and to inform that the Stihl MC 180 carburetor is equipped with a compensator, which is designed and installed in order to take the air necessary for the normal operation of the Stihl 180 chainsaw, bypassing the contaminated air filter. Of course, power with a clogged air filter will drop a little, but it certainly will not stall. Also, power may drop due to piston wear, a Stihl MS 180 piston chainsaw repair will already be required.

Carburetor

One of the reasons why the chainsaw does not develop speed when you press the gas, but instead 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 does it stall? The reason is a stuck carburetor valve nozzle. Of course, this is not 100%, but the probability of such a malfunction is high. We recommend reading the article about the device and repair of the Stihl 180 carburetor.

In order to check the nozzle, 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, and then remove the air filter and the engine control lever, while disconnecting the throttle control rod from the carburetor. Next, you need to slightly pull the carburetor towards yourself, 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 flow from it.

After removing the carburetor, it must be purged and cleaned of dirt, only after that the carburetor can be untwisted.

It is necessary to unwind the cover of the main carburetor chamber, this is the one on which the compensator is mounted on top. Then with a bolt of 8 mm and a length of at least 50 mm. We 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 against damage to the body.

After the nozzle is removed, it can be purged using a compressor. The valve must allow air to flow in only one direction, if the valve can be blown freely in both directions, it means that it is defective and must be replaced with a new one. Assemble the chainsaw after the valve has been repaired, following the reverse disassembly sequence.

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

Another common reason why the saw may stall with increasing speed, air intake in the carburetor. This can only be checked with a special tool, but it is worth noting that if preventive work with 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 examine 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 let the fuel mixture through. In this case, the saw will not work.

Why stalls idling

The first and most common cause of this malfunction is the incorrect carburetor adjustment. You can adjust the idle speed yourself, for this you need to have a Stihl adjustment 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 indicated by “-” and “”.

If the Stihl chainsaw does not keep speed and stalls idling, you can be almost 90% sure that it has a violation in the fuel pump system, as a rule, it is the air leaking into the crankcase through the gasket of the sump, or, much more often, through the oil seals crankshaft. Air suction reduces or even completely stops the impulse, which is supplied through special channels to the fuel pump of the chainsaw. As a result of this, the Stihl 180 chainsaw does not receive the required amount of fuel and stalls at idle.

Diagnostics can be done using a special device called a vacuum gauge.

The second way to check the efficiency of the oil seals is to pour gasoline into the engine crankcase and look at them if the oil seals pass gasoline, which means they cannot provide normal pressure in the crankcase, which will make idling impossible. And when working at high speeds, with leaky seals, there is a possibility of jamming of the crankshaft bearings.

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

The top cover is removed.
The air filter housing and the carburetor are dismantled.
The handle of the chainsaw is removed.
The starter is untwisted and removed.
The side cover and drive sprocket are removed from the opposite side from the starter.
A piston stop is installed in the spark plug hole or a cord 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 clutch of the chainsaw has a left-hand thread and is unscrewed clockwise.
The gear wheel of the oil pump drive is removed.

Having disassembled the Stihl MS 180 chainsaw, you can see the seals, after that it is necessary to fill the crankcase with gasoline and to check the leakage. It is possible to fill the crankcase through the fuel window in the cylinder; for this, the piston must be raised as high as possible. If leaks are found, defective oil seals must be replaced, or the pan re-sealed. Stihl 180 can be assembled following the reverse sequence of the algorithm.

Why stalls at full speed

You can often hear the question of why the chainsaw stalls at full speed. There may be several reasons. First, you need to consider how exactly the saw stalled. Let’s say the tool worked fine and suddenly, for no apparent reason, it suddenly died out and the starter does not crank. In such a situation, you can be 100% sure that the chainsaw is stuck and you need to proceed with its overhaul.

The second situation is when the Stihl 180 chainsaw worked fine, then gradually in a short time it lost power and died out, while overheating of the cylinder is observed. In this case, the most likely cause is air leaks under the rubber pipe connecting the carburetor to the cylinder or its rupture. The mixture was leaner, resulting in overheating. You can eliminate the cause by changing the nozzle.

Conclusion

If the Stihl MC 180 chainsaw stalls at idle, does not gain power when you press the gas or 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 push-pull saws, it is better to turn to specialists, because this technique is rather capricious and any mistakes are expensive.

The first thing to check is the fuel filter.

Idle of the STIHL MS 1800 chainsaw. The chainsaw stalls and the speed cannot be adjusted

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

After removing the carburetor, it must be purged and cleaned of dirt, only after a while, of course, untwist the carburetor.

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

To see clearly how the carburetor is being repaired, and more precisely how to knock the valve-nozzle out of the carburetor body, of course, by watching the video.

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