Chainsaw Stihl 180 does not develop 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.

Additional Tips

First of all, what you should remember when purchasing this kind of tool is that certain parts of the saw must be replaced with new ones after their service life (passport) has expired. It is for this reason that the instruction should always be at your fingertips, since everything is described in a detailed way there.

Parts of this kind include: an asterisk (leading), a bus, a part of a system (anti-vibration), and a chain. Since you should not forget that if this “filling” is not changed to a new one at the necessary time, then these worn-out parts will negatively affect the rest of the chainsaw. It is for this reason that you frequently check the depth of the direct toothing. Remember that it should not be higher than a week 0.5 mm.

STIHL 180. Classics of the genre. Doesn’t develop momentum

The STIHL MS 180 chainsaw has some nuances that make owners nervous, and is wasted on expensive.

The main ways to troubleshoot a STIHL MS 180 chainsaw are to disassemble, rinse and blow out the carburetor, change the fuel filter in the tank, check the fuel hoses for cracking (they can suck in air). There is only one adjusting screw on the carburetor. idle (it happens, you turned it, and the chainsaw started working again). The connection of the carburetor to the cylinder, in terms of air leakage, is reliable. there is a plastic ring there (no gaskets are needed).

STIHL 180 does not gain momentum stalls.

Assembling after eliminating the malfunction of the chainsaw (after eliminating the malfunction of the chainsaw carburetor) is carried out in the reverse order of disassembly. When assembling the throttle valve, before tightening the screw, the throttle valve itself must be correctly set so that it does not jam, and the thread of the throttle valve fastening screw to the axle should be degreased and smeared with a special thread sealant (sold in small tubes, red, liquid) or flattened with pliers, because if this bolt is unscrewed during operation, it goes straight into the cylinder) and repair or replacement of the piston cannot be avoided). So we examined the elimination of this chainsaw malfunction.

Doesn’t slow down

The tool quickly reaches its maximum number of revolutions and the power does not decrease. This situation is explained by the fact that:

  • the throttle valve does not work due to a weakening of the spring or traction element;
  • the switching on toggle switch periodically fails;
  • no corkscrew on the throttle shaft;
  • clogged carburetor;
  • the fuel hose and the petrol filter are malfunctioning.

External inspection of the candle

A visual inspection of a spark plug can tell a lot about engine performance:

    A wet working part, which is wrapped in a cylinder, indicates a malfunction in the power supply system. The fuel mixture is too rich. Carburetor adjustment required. Or the ratio of oil to gasoline is incorrect. The oil is filled with more than the norm and it does not have time to burn during the working stroke of the piston. Carbon deposits appear.

You need to clean it with sandpaper. Under no circumstances should the candle be ignited with an acetylene or gasoline torch. After that, the inside of the candle may separate.

  • Weak spark. To see the spark, the candle must be unscrewed. Then a high voltage wire is connected to it, the metal part of the candle is pressed against the cylinder. Then you need to pull the starter, and at this time look at the spark plug electrodes. A weak, unstable spark can indicate poor contacts in connection with a high-voltage wire, an incorrect gap between the electrodes. Different candles have this gap between 0.5 and 0.7 mm. As a result of the fact that the inner electrode gradually burns out during operation, the gap increases. To restore the distance, you need to knock out the external electrode a little, or put a new candle.
  • Depressurization of the candle. Occasionally, you will notice a dark edging between the spark plug insulator and the metal nut. This indicates that the metal part has moved away from the ceramic. With such a candle, the chainsaw stalls or works intermittently. This is because a spark strikes the cylinder through the plug body. Depressurization can occur with a cheap, poor-quality plug, or if at the time of installation, it was unnecessarily tightened.
  • Not gaining momentum

    Many mechanisms of the mechanism are involved in the start-up, therefore, the loss of speed of the STIHL chainsaw after idling can be a consequence of various factors. Confident idle operation and interruptions in the motor under load can occur for the following reasons:

    • development of the engine resource;
    • wear, deformation and corrosion of the piston group;
    • malfunction of the ignition coil or spark plug;
    • unbalance of carburetor screws.

    If the tool does not develop speed, then the conductivity of the hole in the fuel tank cap is broken. The emergence of a vacuum does not provide the required amount of fuel, therefore the engine does not gain the required power. Turnover decreases when carbon monoxide deposits accumulate in the muffler, it is difficult to remove gases from combustion.

    The chainsaw engine turns off after reaching the maximum speed mode

    The power unit stalls at high speeds due to a mismatch with the declared performance requirements of the electronic unit. Refusal is more typical for budget chainsaws made in China.

    • lack of fuel mixture in the float chamber due to valve sticking;
    • clogging of the fuel filter or the breather in the fuel tank cap.

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    The power unit also stalls at high speeds due to a dirty air intake filter. The same signs are typical for a situation when the chainsaw starts up in standard mode and stalls during the warm-up phase.

    Troubleshooting the chainsaw carburetor

    Remove the carburetor from the chainsaw. Remove the fuel pump cover with the membrane by unscrewing one screw in the center of the cover. Then turn the carburetor towards you with the throttle valve, on the side where there are two holes, a pin is visible in one, and there is an accelerating pump under it. Remove the retaining ring from the outside of the pin and disconnect the air damper spring wire. Unscrew the screw in the center of the throttle valve, remember how the throttle valve stands (so that it can be installed later) and remove the throttle valve. Plug the hole with the pin with your finger (the accelerator is spring-loaded and if you remove the throttle shaft and do not close the hole, the accelerator will pop out), then turn the throttle shaft and remove it. Shake out the accelerator (piston) with a spring from the hole. There is a rubber cuff (ring) on ​​the piston. its wear is the cause of the chainsaw malfunction. It is necessary to replace the piston with a rubber cuff and a spring (they are sold as a repair kit). Or you can remove the worn piston with a spring, and plug the hole by pushing a rubber plug into it (the chainsaw will not have an accelerating pump, i.e. it will accelerate not in 3 seconds, but in 4 seconds, but it will work well since there will be no suction air carburetor).

    Assembling after eliminating the malfunction of the chainsaw (after eliminating the malfunction of the chainsaw carburetor) is carried out in the reverse order of disassembly. When assembling the throttle valve, before tightening the screw, the throttle valve itself must be correctly set so that it does not jam, and the thread of the throttle valve fastening screw to the axle should be degreased and smeared with a special thread sealant (sold in small tubes, red, liquid) or flattened with pliers, because if this bolt is unscrewed during operation, it goes straight into the cylinder) and repair or replacement of the piston cannot be avoided). So we examined the elimination of this chainsaw malfunction.

    Reasons why the Calm 180 does not develop speed

    Chainsaw quiet 180 does not develop speed or after you release the throttle trigger it continues to work without losing speed. These problems are fairly common. Let’s try to figure out the reasons that lead to the occurrence of such problems. Also in this article we will look at how to diagnose if a chain saw is catching.

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    Clogged air filter

    The main reason for a clogged air filter is fine dust from sawing wood. It clogs the sawn timber especially hard. Of all the causes of a stalling chainsaw, this is the most common. Some models are an exception. For example, a STIHL chainsaw stalls for various reasons, but not because of a clogged air filter. Because her carburetor is equipped with a compensator that draws in air if the filter fails.

    Wood dust particles penetrate under the housing and are sucked in by a filter mounted on the carburetor. Clogged mesh creates resistance to air, and less air enters the carburetor.

    In order to clean the air filter, it is necessary to dismantle the closing cover and separate it from the carburetor.

    Before removing, you need to shake off the sawdust with a brush or blow with air. Then remove the filter so that debris does not enter the carburetor. During cleaning, cover the carburetor with a rag.

    Then the filter must be blown out from the inside with compressed air, and then reinstalled.


    Violation of the functionality of the fuel unit system leads to air leakage. In this case, the unit stalls at idle and does not keep their number. Additional suction reduces the air impulse to the fuel pump and passes through the sump membrane or crankshaft oil seals. Diagnostics is done with a vacuum gauge.

    The termination of engine cold operation occurs for other reasons:

    • the candle channel contains an excess amount of the combustible mixture;
    • the gap between the tip of the candle and the high-voltage cradle is not adjusted;
    • power supply failure.

    The oil seals are checked by pouring gasoline into the crankcase, the leak is visible visually. This means that the engine does not idle, and at a high frequency, leaking oil seals will lead to seizure of the bearings. In case of leakage of elements, they are replaced with new ones and they are sealed.

    Mesh filter in the carburetor

    The last possible blockage point is in the carburetor sieve. The chart below indicates the number 13.

    Checking the fuel filter

    The fuel filter is installed in the tank of the STIHL 180 chainsaw, and it is not very convenient to pull it out. To facilitate the process, you can take a small piece of aluminum wire and bend it at the end, then use it to hook the fuel hose and remove it, along with the filter, from the tank. To check the filter, it is necessary to blow into it, if air does not pass, then the reason has been found, and the filter must be replaced.

    If the filter is clean, check the fuel hose for clogging. To check, it is necessary to disconnect it from the carburetor and, with the air filter removed, blow into it. If a blockage is found, the hose can be cleaned mechanically, using a wire, and then blown out with compressed air.

    When the first signs of power loss (decrease in speed) appear with the STIHL MC 180 chainsaw, in no case should you continue to work, but you should immediately contact a specialist or diagnose and fix the malfunction yourself. There are not so many reasons for the loss of power, and you can cope with them even without having certain skills. The main thing is to calmly analyze the behavior of the saw and find out the reasons why it stopped pulling (the speed dropped), and fixing the malfunction is already a simple matter.

    What to do if the chainsaw does not idle?

    Idling problems are considered constant companions of chainsaws. There may be several prerequisites that could lead to glitches at the time of starting and scrolling of the circuit during idle operation, the main ones are:

    • clogging of the air and gasoline filter;
    • poor-quality fuel mixture or improper preparation;
    • malfunctions of the ignition module;
    • a carburetor whose settings have ceased to correspond to the load on the saw;
    • the propulsion elements are deformed or rusted.

    A number of actions are performed sequentially:

    • flush the fuel hose or replace it with a new one,
    • clean the air filter, which could be clogged with sawdust and dirt particles. Modern air filters are reusable, they can be washed with the addition of detergent, completely removing them from the saw body;
    • check gasoline and engine oil, which may be of poor quality or simply not suitable for working with this saw;
    • test candles and carburetor.

    Eliminating one or more possible faults usually returns the saw to its former strength.

    The chainsaw does not develop speed: we test the device for malfunctions

    The ignition module can be diagnosed for problems visually. For this you need:

    • turn out the candle;
    • evaluate its appearance (it should not be drenched in gasoline or contain a black coating);
    • check the distance between the coil and the magnets (up to 0.2 mm);
    • if necessary, examine the spark plug unit for spark supply using a working mains wire.

    If, after checking, no defects were found, it is worth moving on to checking the carburetor block.

    stihl ms180c that wont idle and runs rough watch this

    This work unit is one of the most vulnerable in modern chainsaws. New tools, which are shipped from the factory, have basic settings. for low and high speeds, which must be reset after running-in and running-in of all parts. Similar actions are performed if the saw does not develop traction corresponding to the maximum torque according to the instructions.

    In this case, you need to reconfigure one of them. the “H” jack, which is responsible for the operation of the saw under load. To do this, it is enough to adjust the fuel supply with the engine running at the highest speed of rotation of the chain using a tachometer and operating instructions.


    Answer: STIHL MS180. began to stall under load

    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.


    Answer: STIHL MS180. began to stall under load

    Of course, I don’t understand anything about chainsaws, and gasoline with oil for a two-stroke engine interfered for the last time in the pioneer age. But today’s automotive experience allows us to state that gasoline at different filling stations can be very different. And if a car 4-stroke computerized motor perfectly feels the different quality of gasoline, then what can we say about a small tyrchik. And low-quality gasoline has a higher proportion of light aromatic hydrocarbons. They are more volatile, have a higher octane number, but a lower heat of combustion, and most likely a different stoichiometric ratio, which will be critical for a motor with a simple carburetor. Alternatively, try to find a mixture quality screw and twist it, but such gasoline is better nafig. At least the very first thing to do to dispel all doubts is to refuel with proven gasoline. And by the way, yes, first of all, high-octane gasoline suffers, just from additives that increase the octane number. Take no higher than what is written in the manual. You can still smell the gasoline. It should smell like gasoline, not acetone.

    Malfunctions occur both with expensive German or American modifications of chainsaws, and with their cheap Chinese fakes. It’s nice when the moment of starting the motor tool goes smoothly: the saw warms up and gradually reaches the rated power declared by the manufacturer, which is issued throughout the entire working cycle. Things are worse if everything happens the other way around: after pulling the throttle cable, the unit starts to slip, works in jerks after short pauses, stalls and re-starts from the pusher.

    There can be many reasons for this phenomenon, as well as scenarios for the development of events. Let’s consider in detail each working situation and breakdowns that preceded them.