The Chainsaw Stalls When The Gas Is Pressed
For what reasons the Stihl 180 stalls at idle or full throttle Why the Stihl 180 chainsaw stalls when you press the gas. Description of the reasons, methods of troubleshooting. About carburetor repair.
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, 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.
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 symbols. 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 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, which 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.
The second way to check the performance of the oil seals is to pour gasoline into the crankcase of the engine and look at them, if the oil seals let gasoline pass, 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 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 carburetor are dismantled.
- The handle of the chainsaw 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 oil pump drive gear is removed.
Having disassembled the Stihl MS 180 chainsaw, you can see the oil seals, after that you need to fill the crankcase with gasoline and 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, it is necessary to replace the defective oil seals, or re-seal the pallet. You can collect Stihl 180 following the reverse sequence of the algorithm.
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 normally 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 overhauling it.
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 leaking 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.
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), 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 faults in the fuel system and to determine the exact reason why the Stihl 180 chainsaw stalls when you press the gas, it is necessary to carry out a complete diagnosis. We recommend reading about common malfunctions of the Stihl 180 chainsaw and their elimination.
For what reasons the 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.
On the pages of the world wide web, you can find information that the Stihl 180 chainsaw can stall due to strong pollution 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 piston Stihl MS 180 chainsaw.
Air filter dirty
It’s easy to make sure 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 protection from dust if there is no dust cloud around you, then everything is in order.
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 latch 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 looks like 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 in place.
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 a hose through which fuel is taken from the tank.
This hose must be gently pryed off 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.
Therefore, we simply change the fuel filter to a new one and try to work. If everything is fine, then congratulations you found the reason.
Low oil in the fuel mixture
Let’s look at the most unpleasant case first. Why? Because before manipulating 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 stopped starting 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 into an expensive repair. Otherwise, you can still do it. To dispel doubts is to drain the old fuel from the tank and fill in freshly prepared 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 be a little native), then I recommend using a ratio of 1:40, even if the oil packaging says 1:50.
For the exact 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.
After preparing a new mixture, drain the previous mixture from the tank, in which we are unsure, and fill in the fresh one 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 there are no seizures, then with the new fuel mixture prepared in the correct ratio, the chainsaw should start working normally.
If seizures have appeared, then the saw may start and stall several more times, after which it will stop starting altogether. In such a situation, I sympathize with you, because, 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 manipulate the filters.
Why does the chainsaw stall when I 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 for 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:
- Improperly tuned or clogged carburetor is the most common case;
- It does not have enough air, the consumption of which increases sharply with increasing speed, which 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 speed, which 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 such operation of the chainsaw, you will most likely fly into the repair of the piston group, since scuffs form on the piston and cylinder walls that impede operation saws.
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 is 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 look at which shows how experts do it:
I will end on this. Thanks for your attention! Read more articles on this site! Until next time!
Why does the petrol trimmer stall
A scythe with a gasoline drive is a useful thing for owners of home gardens, lawns, and when the trimmer suddenly stalls, the work to clear the area from grass stops. The device itself is a rather complex mechanism, so there are many different reasons for its breakdown. The most common problems are contained in the operating instructions. You should know the reasons why the trimmer stalls in order to effectively repair the device yourself.
Immediately after wound up
The unit may stall immediately after starting if the carburetor is misaligned or incorrectly adjusted, this causes an uneven fuel supply. The result of this is that the device vibrates distinctly. For troubleshooting, the carburetor is reconfigured, following the instructions for the mechanism.
Also, the engine stops when the fuel supply valve becomes clogged. In such cases, it is sufficient to simply clean it. If the brushcutter first worked, but then immediately stalled, then perhaps the fuel enters the carburetor unit with some difficulty. Weakening the valve helps to resolve the issue, which ensures free circulation of the mixture in the system.
The stoppage can also be caused by air leakage in the presence of mechanical damage to the hose (holes, cracks) that takes the fuel. In this case, add more revolutions to the drive in order to quickly expel air bubbles from the system.
When you press the gas
If, when you press the gas, the petrol cutter stops, then the reasons may be as follows.
- The most common variant is carburetor adjustment failure, which occurs when the drive is under significant stress, after prolonged inactivity of the mechanism, or when it is used in difficult conditions.
- Clogging of the fuel valve, which is eliminated by loosening it, as a result of which gasoline begins to flow normally through the system.
- Loosening and drooping of the cable in the carburetor. The fuel hose can also be stretched to the point of rupture due to significant stress.
- Clogged breather (non-return valve), as a result of which fuel does not flow into the tank.
If the problem is related to the carburetor unit, then it can be recognized by the appearance of vibrations of the brushcutter. When the hose bursts or the cable is stretched, these components are replaced.
What could have broken
Problems with the petrol brush, due to the fact that this device does not start, are classified in a certain way by service specialists. They highlight faults with the following components of the mechanism:
- An engine in which the piston and bearings may wear out or fail, crack the crankcase;
- The fuel supply system, while the filter may be clogged or problems with the carburetor;
- Mechanical damage to wires, tubes, hoses;
- Ignition circuit.
At idle, common reasons for stopping the trimmer are as follows:
- Dirt, misalignment or incorrectly adjusted carburetor adjustment;
- Clogged air filter;
Replacing the air filter of brushcutters
Trimmer air filter
- Reducing the speed of the gearbox when it heats up, which is a consequence of the use of an unsuitable fuel mixture;
- Clogged throttle;
- Air ingress into the system;
- Not enough fuel to operate the petrol cutter.
At high revs
When the scythe stalls at high speeds, this is due to the following problems:
- Clogging or sticking of the valve located on the gas tank cap;
- The carburetor is out of alignment under the influence of vibrations arising during the operation of the mechanism;
- Problems with the circulation of the fuel mixture;
- Suction of atmospheric air;
- The fuel intake hose is cracked or loose.
Adjust the carburetor according to the trimmer operating instructions. For adjustment, it is often sufficient to loosen the tightening of its housing. If there are problematic points with the circulation of the fuel mixture, then it can gradually enter the carburetor. After its development, the engine stalls at high speeds.
Troubleshooting reasons and features
Why the chainsaw stalls after starting or during operation, you can find out only after performing a check. As a result of the check, you can not only find the reasons for the malfunctioning of the motor, but also possible breakdowns. To find the exact cause, you need to know in what cases a malfunction occurs. Let’s consider such cases, as well as find out the features of troubleshooting.
Stalls at idle
If the chainsaw does not start well and stalls at idle, then the first reason is a clogged muffler. The muffler should be dismantled and then wet cleaned. This is very important as dry cleaning can cause dust to enter the lungs and cause serious respiratory failure.
The second reason that the chainsaw stalls at idle is an incorrect carburetor setting. To idle the chainsaw, tighten the screw called L on the carburetor. If the tool stalls at idle speed, the screw should be turned 0.5 turn clockwise. To accurately adjust the carburetor, it is recommended to use a tachometer, and the tuning technology is described in this article (link).
Why does a chainsaw engine stall when you press the gas
Despite the high performance of chainsaws, sometimes there are moments when the tool stops working normally. In particular, a common situation is the fact that the chainsaw starts to stall when you press the gas. For experienced tool owners, this problem is known, but beginners who are faced with this for the first time will have to seek help from specialists. But do not rush, in the material you can find all the important causes of the malfunction, as well as try to eliminate them.
Stalls under load
If the chainsaw starts to stall under load, then the reason for this is, first of all, an incorrect carburetor setting. If this reason is eliminated, then in addition to problems with the carburetor, the reason for the inoperability of the tool under load may be damage and wear of the crankshaft oil seals or carburetor gaskets, through which air is sucked into the system.
It is recommended to start troubleshooting by checking the seals and gaskets, and only after that check the correctness of the carburetor setting. Another reason why the chainsaw starts and immediately stalls under load may be the chafing of special hoses, through which impulse is transmitted from the crankcase to the fuel pump. But such hoses are not installed on all models of chainsaws, but only mainly on professional ones. It is recommended that this hose be replaced to rectify the problem. How to do it correctly is discussed in the video:
Stalls when you press the gas
If the engine stalls when gas is added, this may be due to:
- Clogged or incorrect carburetor setting;
- Contamination of the air filter, whereby the engine does not have enough air to set speed;
- Clogging of the fuel filter, which contributes to the intake of an insufficient amount of the fuel mixture;
- Malfunction of the cylinder-piston group. With an insufficient amount of oil in the fuel mixture, excessive friction of the piston against the cylinder walls occurs, which leads to overheating and the formation of scoring.
In case of overheating with a lack of oil in the fuel mixture, the engine will need to be overhauled, which is one of the most unpleasant consequences. In order to properly adjust or clean the carburetor, you should give it to a specialist, as lack of experience with small parts can lead to damage to the mechanism. You can check the air and fuel filter yourself.
If the chainsaw does not allow you to develop speed when you press the gas, then it is advisable to try to replace the fuel mixture in the tank, especially if it has been in the tool for a long time.
Checking the main systems of the chainsaw
If the chainsaw stalled after pressing the accelerator, it means that there is a breakdown of some element. It is very difficult to determine immediately the cause of such a malfunction, since various factors can contribute to this. The search for the cause should start with the verification activities of the main systems of the instrument, starting from the smallest to the largest.
The first step is to check the presence of fuel in the tank. Craftsmen often get so carried away during sawing that they forget to add fuel to the tank. Even if there is a certain amount of fuel in the tank, and the chainsaw starts up and immediately stalled, then the reason for this may be precisely the lack of mixture as a result of clogged fuel channels.
If everything is in order with the fuel, then the cause must be sought in the spark plug. Unscrew it and inspect the contacts. If there are no signs of dampness and carbon deposits, then you need to check the size of the gap, which should be 0.5 mm, and after the presence of a spark. If the candle has not been replaced for a long time, then you need to change it, and then restart the tool.
It is also necessary to check the muffler, as clogging can impede the release of exhaust gases, which affects the functioning of the internal combustion engine. The muffler must be dismantled and wet cleaned from carbon deposits. If the above steps do not help fix the problem, then you will need to delve into the situation in more detail, since the cause may be a malfunction of the carburetor or the need to adjust it.