Chainsaw Stalls On Hot

The main causes of chainsaw breakdown

Although the chain saw is a simple device, from time to time, problems arise in its operation, which can only be fixed by disassembly. The following malfunctions can be cited as examples:

  • The chainsaw is not picking up speed;
  • The chainsaw stops working in the cut;
  • The chainsaw starts and stalls;
  • The chainsaw loses its power;
  • Chainsaw stalls when pressed.

Most often, malfunctions are associated with interruptions in the functioning of the motor, as well as malfunctions of other systems and components. Proper handling of this technique is essential. When all the rules of use are followed, problems with a high probability lie in the most obvious. When looking for the causes of problems, it is advisable to start by checking the simplest part of the chain saw and finish the most difficult.

What to do

The power tool is operated according to the manufacturer’s instructions. Only after checking the chain tension does the unit start. At the same time, the filling of the tanks with a combustible mixture and oil is controlled, the device is securely fixed in the hands. If, when all the rules are followed, the mechanism refuses to work, then the Stihl chainsaw is repaired.

Why does a chainsaw stall when heated

It often happens that the chainsaw starts up cold, but stalls during the heating process. This behavior of the tool can be caused by the following reasons:

  • The carburetor is incorrectly set. This problem can be identified by how the device is started up on a cold one. If it is performed without closing the air damper, and the engine starts without a preliminary flash, this means that after heating the engine, the fuel fills the candle. The solution to this problem is to adjust the carburetor. Details on carburetor adjustment
  • Coil (ignition module) malfunction. You can identify this problem by sequentially checking the spark, first on a cold and then on a hot motor. If there is no spark on a hot engine, then the ignition coil must be replaced.
  • Defective spark plug. In this situation, as in the case of a malfunction of the ignition module, the spark disappears when the engine heats up. It is necessary to replace the spark plug with a new one, and if this does not lead to a solution to the problem, then the ignition module and the distance between it and the flywheel should be checked.

Why does the 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), since if the ignition is faulty and there is no spark, the tool would simply not start. Means the fuel system remains.

There are a lot of malfunctions in the fuel system, and to determine the exact reason why the Stihl 180 chainsaw stalls when you press the gas, you need to carry out a complete diagnosis. We recommend reading about common malfunctions of the Stihl 180 chainsaw and their elimination.

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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, you can be almost 90% sure that it has irregularities in the fuel pump operation system, as a rule, it is air leaks 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 fed 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.

Chainsaw Stalls On Hot

The second way to check the performance of the oil seals is to pour gasoline into the crankcase and look at them, if the oil seals let gasoline pass, then 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 crankcase and Stihl 180 oil seals for leaks is as follows:

  • Removable top cover.
  • Dismantle the air filter housing and carburetor.
  • The handle of the chainsaw is removed.
  • The starter spins and retracts.
  • On the opposite side from 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 the 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 by following the reverse sequence of the algorithm.


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 mechanisms do not work: reasons and solutions

You start the saw under different conditions. It can be hot, cold, worn out or new, and each of these cases requires a different approach.



A special oil-gasoline mixture is prepared manually by the owner of the tool, so inaccuracies are possible here. The desire to save on fuel has a bad effect on the tool, up to its complete inoperability. To keep everything working without interruption, make sure you are using the highest quality gasoline and oil that is indicated in the instructions. A correctly formulated mixture can be stored ready-made for no longer than two weeks.

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Gasoline fuel loses its properties in the third week and will not be able to power your instrument normally. Chinese-made chain saws are especially sensitive to the quality of the mixture. Sometimes you have to go through several different oils before you achieve a smooth and high-quality stroke.


This is a fragile element of a chain saw that needs delicate debugging. If you have checked all of the previous items and they are working properly, start cleaning the carburetor. Contamination of it destroys the entire machine. Lay out a clean cloth on your work surface and gradually, piece by piece, disassemble this mechanism.

Clean off dust, tar and carbon deposits with special liquids. A nozzle cleaner is suitable. Then reassemble the entire mechanism. If necessary, write down the order in which you removed the parts, or place them in order on the table. The cleaned carburetor will start to function.


Custom cleaning outside the service center is of poor quality. If you gave the tool to a familiar craftsman for cleaning, but after returning it did not manage to start it, the reason lies in residual dirt. You can take the saw for a professional cleaning, or you can do it yourself.

Begin by draining the fuel / lubricant mixture. Then dry all parts and, if possible, clean off carbon deposits from them with files. Disassemble the saw into hoses, cylinders and valves. Disassemble the carburetor on a separate work surface. Replace the fuel filter, wash and reinstall the air filter. Wash all parts in warm soapy water and blow dry. Then collect everything in reverse order and try starting. He must be successful.

Spark plug

This reason is easy to determine. In the event of a plug malfunction, the device starts up and stops working immediately. The accumulation of the fuel mixture on the electrodes and the build-up of carbon deposits on them leads to a malfunction of this element. To get rid of this problem, remove this element, remove the carbon deposits with a file, turn it out and wait half an hour until it dries. Drain the rest of the mixture, put the candle in place and you can continue working.

If this element is dry, its malfunction lies in the large distance between the tip and the sparking wire. Check the spark: remove the tip, remove the candle, put the tip in place, put the candle so that it touches the cylinder with its skirt. Start up. If the spark is visible and large, the spark is not the problem. If the spark is weak, reduce the distance between the electrodes using a special feeler.

Malfunction of ignition coil

The malfunction of this element lies in the fact that in the cold state, the coil normally organizes the supply of current to the candle, but when heated, it opens or, conversely, closes. Because of this, the spark stops forming and the chainsaw stalls.

Repair, as a rule, in this case consists in replacing the entire coil. With minimal skills, you can do it yourself. there is nothing particularly difficult here.

This malfunction is diagnosed very simply. You just need to check for a cold spark, and then a hot one. If there is no hot spark, then the coil is to blame. However, you need to take a candle that is known to be working, that is, one that works without problems on another serviceable chainsaw, since the reason may be just in the candle. and this is the third reason in our article.

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Why does the chainsaw stall when heated?

Hello! In this article, we will answer the question of why the chainsaw stalls when heated. There are few of them. only three. Two of them are connected to the electrical part, and one to the fuel supply. The purpose of this article is to help diagnose these causes. And then it is up to you to decide for yourself whether it is worth undertaking repairs yourself or whether it is better to contact specialists.

Well, let’s list these three main reasons.

Incorrect carburetor setting

This is perhaps the main reason why a chainsaw stalls when hot. It is diagnosed quite simply: when starting on a cold chainsaw, it starts with an open damper without the first short flash. Let me remind you that with proper cranking on the cold damper, you need to close and pull the starter until the engine tries to start and immediately after that it stalls. Only after that, the flap needs to be opened and the chainsaw will start to work.

So, if the chainsaw nevertheless starts up immediately without first pulling the starter with a closed damper before the first preliminary flash, this means that the fuel mixture initially comes in a lot so that the chainsaw is immediately ready for work without preliminary warming up, and then when it warms up expansion of the fuel supply channels, due to which the gas mixture begins to flow in too large quantities and simply fills the candle, since the fuel does not have time to completely burn out.

Therefore, adjustment of the carburetor is required, in which it is necessary to slightly reduce the flow of the gas mixture. This is done by rotating the corresponding screws, marked with the letters H and L, which are accessible from the surface of the saw body. On household models, sometimes there is only one screw.

You can make the adjustment by eye yourself, but it is still better to contact the service, since precise adjustment requires special equipment, which a common user usually does not have.

Malfunctioning spark plug

It is logical to assume that it is very easy to diagnose this problem if it is possible to test the spark plug on another known working chainsaw. If another chainsaw stalls with this candle, then the problem is in it.

In this case, we can assume that you are in luck, since this is the easiest and most inexpensive option for returning the chainsaw to working condition. New candles are inexpensive and easy to change.

Thus, we have considered three main reasons why a chainsaw stalls when hot. Just do the above diagnostic measures and calmly find out the reason. And on this I will allow myself to finish this text. thanks for your attention and see you in other articles.