STIHL saw stalls when accelerated

Checking the fuel filter

If the fuel filter is clogged with dirt, it will not be able to pass enough fuel through it. As a result, the chainsaw stalls if you press the gas. The fuel burns out too quickly, and a new portion of it does not have time to enter the system. If the fuel filter is slightly clogged, a significant decrease in power is observed at maximum engine speed.

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.

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.

stihl, stalls

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.

Why a chainsaw can stall when you press the gas

If the chainsaw stalls when you press the gas, you may suspect that the system is not getting enough fuel. This can happen not only at the moment of its start-up, but also under heavy load, which was not previously observed. This happens when the saw hits an obstacle in the form of a tree that needs to be cut. In this case, it works at a stronger power than just when you press the gas.

When the unit stalls when the engine rpm is added, a dirty fuel filter can be suspected. It can be easily cleaned by yourself. If a breakdown of the carburetor jet or its other element is detected, it is best to return the chainsaw to a master for repair. When the device starts up, but quickly turns off, you can suspect that fuel fluid is being poured onto the spark plug. Sometimes the air filter just gets dirty.

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If malfunctions are found with the chainsaw, it should be checked after it has cooled down. It is undesirable to touch hot parts, this can lead to negative consequences.

Why does the chainsaw immediately stall and thrash when the gas is pressed

Chainsaws are fairly reliable and uncomplicated designs. Therefore, if you properly care for them and handle them based on the manufacturer’s recommendations, then they fail well, very rarely and various kinds of breakdowns are quickly eliminated. But if you are faced with this situation and want to personally repair your tool without resorting to the help of professionals, then delve into the information provided below.

In fact, it is unambiguously and precisely impossible to determine the reason why the instrument does not start or stalls when you press the gas, since there are a lot of factors affecting this. But do not forget that, starting from the fact that the chainsaw is equipped with a simple two-stroke engine, conditions such as lubrication, fuel, spark and air are important for its effective performance.

Consequently, the carburetor is directly involved in the preparation of the fuel-air mixture, the filter cleans the air from dust, the ignition unit and the spark plug create a spark, and the gasoline contains grease.

Stihl MS290 Dying At Full Throttle

That is why it is necessary to search for the causes of this kind of breakdown in a sequential order, starting directly from the simple ones and gradually moving on to the complex ones. And this is an important factor in the correct repair, since the person who, without thinking, begins to deal with the analysis of the carburetor, brings it to risk. Since this kind of unit must be repaired or adjusted directly in special workshops (read about adjusting the carburetor).

We check the main working mechanisms of the chainsaw

If the chainsaw stalls, you need to check the health of its main systems:

  • fuel tank. The saw will not work normally if there is not enough fuel in it or it is of poor quality;
  • ignition coil and high voltage wire. Normally, the gap of the candle should not be more than 0.5 mm;
  • carburetor and fuel filter. If the tool does not work due to a malfunction of these mechanisms, you must contact a specialist.

Where to look for the reason or where to start checking

All chainsaws have the same design and work according to the same principle. The chainsaw device can be found in this material. It doesn’t really matter which brand of tool. STIHL, Husqvarna, ECHO, Champion, Partner, Sturm and others. A malfunction, which manifests itself in the form when the chainsaw stalls when the gas is pressed, can occur equally both on expensive and high-quality tools and on budget Chinese devices. If a problem occurs, then it needs to be addressed.

A chainsaw is a system of mechanisms consisting of parts. Any part in the mechanism can fail, which will lead to partial or complete failure of the tool. If the engine of the tool starts, this does not mean that the chainsaw is completely operational. When the engine stops working when the engine speed rises, there are corresponding reasons for this. With this malfunction, attention should be paid initially to a number of the following tool mechanisms:

  • Gas tank. make sure there is fuel. If there is sufficient fuel, you should also check the serviceability of the fuel filter, the presence of the connection of the supply hose with the carburetor, and also make sure that the breather is working
  • Spark plug. If everything is in order with the fuel supply system, then a spark plug check should be performed. By the color of the carbon deposits on the spark plug electrodes, you can determine the cause of the breakdown. If the carbon deposit is brown, then the plug, the ignition and fuel supply system are working in the correct mode. The presence of black carbon indicates a malfunction of the ignition, and if the electrodes are wet, then the carburetor should be checked
  • Silencer. Over time, carbon deposits accumulate in the exhaust gas evacuation device, which reduces the throughput of the mechanism. If the exhaust gases have nowhere to go, they will create an obstacle to the normal operation of the engine. In addition to a decrease in power, with a faulty muffler, the engine will stop working with an increase in speed.
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These are the main parts and mechanisms that should be checked first of all if a malfunction occurs when the chainsaw stalls when the accelerator is pressed. There are other reasons why a chainsaw engine stalls when the gas trigger is pulled. What else can contribute to the occurrence of this malfunction, as well as the features of eliminating breakdowns, we will find out further.

Adjusting the carburetor when the engine stalls when accelerating

If the check showed that the fuel supply system, muffler and spark plug are in good working order, then you need to look for a breakdown in other places. Initially, do not rush to disassemble the cylinder-piston group or change the carburetor. It is recommended to start repairs by adjusting the carburetor. For this, all chainsaws have special adjusting screws. They are designed to adjust the idle speed, as well as adjust the fuel supply at low and high speeds. A detailed description of how to adjust the carburetor of a chainsaw is described on the website.

Today we will consider the features of setting the carburetor at maximum speed. You can make sure that the chainsaw is not developing full power using a tachometer. If there is no device, then you can make sure that the engine does not develop maximum speed by ear. We are interested in the screw on the carburetor. Which is for setting high rpm. It is usually denoted by the Latin letter “H”, which is abbreviated from the word “High” (high or large).

To adjust the high speed of the chainsaw, you will need to perform the following manipulations:

  • Tighten screw H clockwise until it stops.
  • Next, you need to loosen it by 1.25-1.5 turns
  • Run the tool and test the speed performance

It is recommended to adjust the tachometer, but if it is not there, then you can check the maximum speed when the tool is working under load.

It is interesting! If you often work with a chainsaw, then you will need to purchase a tachometer, since it allows you to set the most efficient engine operation, which affects fuel consumption and unit power.

After a banal carburetor setting, you can fix the problem with the termination of the engine when the speed rises. It should be noted that it is necessary to adjust the carburetor of the chainsaw regularly, depending on the frequency of operation of the tool. It is not difficult to do this on your own, but you can achieve accurate tuning in one case. if you use a tachometer.

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.

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STIHL 180 stalls when you press the gas

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:

  • 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.


Answer: STIHL MS180. began to stall under load

Stihl chainsaw engine ( motor ) bogging down things to check first.

The real 95th is a rarity here. Almost the entire 95th that we sell is 92nd with additives that increase the octane number. Different companies use different additives. Perhaps this is an ambush. Perhaps it’s the frost. Actually, to be honest, this is the first time I come across a saw operating at 95m. all the saws I came across, grass scythes, generators, motor-drills, etc. were under the 92nd. True, they are all from lowend, but they honestly worked out their money.

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.

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

Chainsaw “bog” what to look for and how to fix

stihl, stalls

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