The STIHL chainsaw stalls when you press the gas

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.

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.

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.

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.

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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.

Stihl MS290 Dying At Full Throttle

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.

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.

For what reasons STIHL 180 stalls at idle or full throttle

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.

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.

Fuel filter dirty

If the option with an air filter did not suit you, then we try to change the fuel one. It is located in the gas tank and is attached to the hose through which fuel is taken from the tank.

This hose must be gently pryed with something and removed from the gas tank its edge, on which the filter is fixed. Here, the option with work without a filter, as in the case of an air filter, is better not to apply, since you cannot know for sure if there are any unnecessary impurities in the fuel.

Fuel filter

Therefore, we simply change the fuel filter to a new one and try to work. If everything is fine, then congratulations. you have found the reason.

Why does a chainsaw stall when you press the gas?

Hello! If you are on this page, then, most likely, your chainsaw stalls when you press the gas, and you want to know why this is happening and what to do about it. Well, I will try to help you with this problem by examining the most common causes of such a misfortune, as well as methods of eliminating them.

To begin with, I will immediately write for novice users that many chainsaws require warming up the engine at idle speed for about one minute before work. While the engine is cold, the saw may stall when gas is added.

So, if a heated chainsaw can idle, but stalls under load, then this means that:

stihl, chainsaw, stalls, press
  • the carburetor is incorrectly set or clogged. the most common case;
  • it does not have enough air, the consumption of which increases sharply with increasing speed. this means that the air filter is dirty (a rare case, since the filter becomes dirty gradually, so the user first notices a loss of power);
  • it does not have enough fuel, the consumption of which also increases with increasing revolutions. this means that the fuel filter is dirty (also an infrequent case);
  • well, and the most unpleasant case, if there is excessive friction between the piston and the cylinder wall, associated with a lack of oil in the fuel mixture. after this operation of the chainsaw, you will most likely fly into the repair of the piston group, since seizures form on the piston and cylinder walls that prevent saw operation.
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Air filter dirty

It is quite easy to make sure that the air filter is dirty. You just need to remove it and start the chainsaw without it. if the saw works fine, then it’s in it and it just needs to be changed or washed, depending on its type. And do not be afraid that the chainsaw will work for a while without dust protection. if there is no dust cloud around you, then everything is fine.

So, remove the air filter. To do this, you need to remove the cover from the rear upper part of the chainsaw, which is fastened either with screws, or simply with some kind of lock that you just need to turn or snap off.

If the saw operates normally when the filter is removed after starting up, then it is dirty.

The air filter is either felt or nylon. The first resembles cotton wool or synthetic winterizer, and the second looks like a fine mesh of nylon threads stretched over a plastic case. Felt needs to be changed to a new one, but nylon can be simply washed in soapy water, dried and put back.

Nylon filter

Felt filter

Well, then we calmly use the chainsaw.

Low oil in the fuel mixture

Let’s look at the most unpleasant case first. Why? Because before you manipulate the filters, it is better to make sure that your oil and gasoline are mixed in the correct ratio.

Here, however, it is worth noting that if your saw has already been started many times (for example, ten times), but continues to start, and then stalls again when the speed increases, then everything is apparently in order with the fuel. Otherwise, she would have simply ceased to turn on altogether.

But still, I recommend immediately dispelling the slightest doubts about the quality of the fuel, as soon as your saw stalled during a set of revolutions for the first time. Because, if the reason is in the fuel, then, as already mentioned above, you can get to an expensive repair. Otherwise, you can still do it. To dispel doubts is to drain the old fuel from the tank and fill in fresh fuel, in which oil and gasoline are mixed in the correct proportion.

The correct ratio is best seen in the instructions for the saw. If you have lost it, then we look at the ratio on the oil package. It is usually 1:50 or 1:40. If the oil is used “non-native” (well, for example, for STIHL chainsaws, STIHL will also not be enough “native”), then I recommend using a ratio of 1:40, even if the oil packaging says 1:50.

For accurate dosage, I myself personally use a medical syringe and a measuring container in which one liter of gasoline can be clearly measured. I pour a liter of gasoline into a container, draw 25 (at 1:40) or 20 (at 1:50) cubes of oil into the syringe and add it to the gasoline.

Your Chainsaw Stalls? You Can Fix It, Here’s How

After preparing a new mixture, drain the previous mixture from the tank, in which we are unsure, and fill in the fresh one we just prepared.

Now that you have done everything to dispel any doubts about the quality of the fuel, we move on to further actions.

As I wrote above, with a lack of oil on the piston and cylinder walls, scuffs can form. and they are almost always formed. If you are lucky and no seizure appears, then with the new fuel mixture prepared in the correct ratio, the chainsaw should start working normally.

If seizures appear, then the saw can start and stall several more times, after which it will stop starting altogether. In such a situation, I sympathize with you, since, most likely, now you will need to replace the piston group, which will be very expensive.

If the saw, as before, starts up and stalls at high speeds, then we carry out manipulations with the filters.

Cleaning and adjusting the carburetor

If all of the above did not help, then, most likely, adjustment or cleaning of the carburetor is required. It is not recommended to do these procedures on your own, since most often such attempts still end with a trip to the service. So it’s better to go there right away and not disassemble anything on your own. But if you still want to dig deeper yourself, then it is best to watch a video that shows how experts do it:

I will end on this. Thanks for attention! Read more articles on this site! Until next time!

Silencer as the cause of the saw stalling under load

Here’s another reason why the chainsaw stalls when you press the gas. the muffler. It is this part that can interfere with the full operation of the tool in cases where it is contaminated directly with exhaust resinous deposits. To do this, you just need to clean it.

Not enough fuel to feed and run the chainsaw at full power

If the chainsaw stalls when gas is added, it means that the fuel is not supplied in sufficient quantities for the full operation of the chainsaw. This may be due to both clogging of the carburetor (its jet) and contamination of the filter itself (fuel). Remember that only professionals should check the first node, but you can clean the second one yourself.

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Filling the mixture when the mechanism is running

Also, the cause of a breakdown can be the direct filling of the mixture with a candle at the moment when the mechanism is started. In order to solve this problem, it is necessary to unscrew and dry the candle, but remember that it should never be ignited. Excess fuel must be drained through the hole (plug), wait 20-30 minutes, then put it back in place and try to start the tool again.

Filter dirty

Since, for example, a STIHL chainsaw stalls when you press the gas for a simple reason, namely a simple clogging of the direct breather.

In order to solve this kind of problem, all you have to do is disconnect the (fuel) hose from the carburetor and pay attention to whether the fuel is leaking from it. Since if the mixture flows in a full stream, this means that the breather is not contaminated, but if on the contrary, then the cause of the breakdown has been found.

The main elements of chainsaws

Before starting to delve into the issues of breakdowns and tool repairs, let’s first figure out what the chainsaw itself consists of. First of all, I would like to note that this tool belongs to the category of technology, the operation of which directly depends directly on the internal combustion engine.

It is also important that chainsaws are equipped with an engine with one cylinder, and the work of which is carried out on such kind of fuel as gasoline. It is worth noting that, despite the similarity with other tools, it does not have a gearbox. And it is replaced by a kind of single-stage chain transmission, through which the movement of the chain itself (saw) is made.

In fact, a chainsaw is a fairly simple design, but this does not prevent it from being reliable, practical and capable of completely providing direct uninterrupted and cyclical operation even in rather difficult conditions. This tool consists of a huge Spectra of certain elements “vital” for its correct and productive work. This is a carburetor, a direct chain tensioner, a tire complete with a chain and other elements.

Before buying a chainsaw, be sure to study all the options, and choose the brand of chainsaw that suits you.

To simplify your choice, we have compiled for you a rating of chainsaws in terms of reliability.

If you have a limited budget, then read the article about Russian chainsaw manufacturers.

Why does a chainsaw stall when you give gas when pressed, and does not start under load at idle

There are often cases when the owners of chainsaws are faced with their breakdown and it does not matter what model of this kind of equipment, since the nature of the breakdowns is almost the same for everyone. Well, the chainsaw has stalled and what’s next? Undoubtedly, you can refer the equipment to specialized services that will repair your “iron friend” for a fee. But as the saying goes: why pay more?

After all, you can personally disassemble the tool and repair it, since the breakdown may be insignificant, and in the service you will pay a lot for this. But naturally, in order to bring the instrument back to life yourself, you need to be able to understand the reasons for its breakdown and how to troubleshoot it. So let’s learn! In this article, you can find answers to questions regarding situations when the instrument simply stalls after directly pressing the gas. So let’s get started.

Wrong fuel

An important fact is that for the trouble-free operation of the tool, it is necessary to be quite careful about the fuel itself. Since if this kind of mixture is not prepared correctly, then most chainsaws will simply not start. Consequently, not every owner will guess to look for the cause of the breakdown in the fuel. That is why, in order for your tool to always work correctly, you need to use exclusively high-quality gasoline for the mixture.

And also use only the oil that is made by the manufacturer of your tool. In addition, it is important to prepare this kind of mixture in the amount that you definitely use in one or two weeks, but not more (see the proportion of gasoline and oil for a chainsaw).

Otherwise, overexposure of the mixture directly in the canister will lead to the fact that it will lose all its octane properties and this will lead to significant problems with the instrument.

There is no spark and the chainsaw does not pick up speed

The chainsaw stalls when you press the gas due to the fact that there is no spark. This can happen when there is no good contact between the tip of the candle and the wire (high voltage). However, if this kind of connection works correctly, but there is still no spark, then the whole reason is the ignition unit (electronic). It is important to note that parts of this kind cannot be repaired, so they can only be replaced.

Do not forget that by examining the spark plug, you can get significant information regarding the breakdown of the chainsaw. Since if its surface is dry, then the reason for this is the cylinder, which is not directly supplied with fuel. That is why you will have to check the entire range of its presentation step by step. If the candle is covered with black soot, then this means that the carburetor is not working correctly, that is, it either supplies a lot of fuel, or pours oil directly into gasoline.