Lawn mower stalls when you press the gas: causes and remedies for the lawn mower stalls when you press the gas. For what reasons does a petrol trimmer or lawn mower stall when you apply gas? What to do if the lawn mower starts and stalls at idle speed? Proven solutions and tips.
When the air damper is opened
Lawn mower or trimmer stalls when raising the damper for the following reasons:
- Pumping excess air due to a cracked fuel suction hose;
- Oil seals are worn out;
- Improper functioning of the fuel and air metering unit when mixed.
Stop the lawn mowers in this case immediately.
When idling
When you run your trimmer or lawn mower at idle speed, you find that the device starts but stalls after, say, 510 minutes. The reasons may be as follows:
- Clogging, violation of carburetor adjustment;
- Initially incorrect setting of the carburetor valve mechanism;
- Clogging of the air filter;
- Reduction in the speed of the gearbox (if any); incorrect air-fuel ratio;
- Clogging of the throttle;
- The penetration of excess air into the fuel system;
- Running out of fuel in the tank (and oil in the tank if the engine is a four-stroke).
If there are problems directly with the carburetor, the machine will stop both after a cold start and after starting on an already running engine.
Diagnostic features
A well-posed question is already half the answer. The fact under what circumstances a petrol trimmer or lawn mower stalls will significantly speed up the search for a solution, namely:
- Immediately after the start;
- When it has been idling for some time after one or several minutes;
- When you press the gas button (or knob) or shortly after starting work at high, near maximum speed;
- Under heavy load (for example, to prune bushes, mow dense and tall weeds);
- When warmed up in the cold, it heats up unnecessarily (the lawn mower has stalled due to overheating);
- After opening the air damper.
The lawn mower stalls when you press the gas
With a similar problem, you should pay attention to the fuel valve, which, when clogged, ceases to pass the fuel mixture normally. The solution to this problem is to mitigate it with a suitable tool. In addition, a problem with the circulation of the fuel mixture may lie in a dirty valve. To do this, simply blow it out with a compressed air stream.
Trimmer stalls: causes and troubleshooting
The lawn mower is a mobile, high-performance tool for beautifying home gardens and surrounding areas. With prolonged use, due to wear of parts or manufacturing defects, malfunctions occur, which lead to the trimmer stalling or not starting. Since this tool is a rather complex mechanism, there may be several reasons why the lawn mower stalls.
Why does the trimmer stall
There are two main ways to troubleshoot problems: transferring the braid to a specialized center or solving the issue with your own hands. The first option is suitable for those who are ready to shell out a tidy sum to restore the unit’s performance, and the second for those who have basic locksmith skills and can independently figure out the causes of breakdowns and ways to eliminate them.
Currently, it is customary to classify breakdowns for which the lawn mower stalls into the following categories:
- Mechanical damage to the internal combustion engine crankcase, malfunctions of the cylinder-piston group (CPG);
- Breakdowns associated with the supply of the fuel mixture (air filter, carburetor);
- Malfunctions due to damaged pipes, hoses, cables or ignition circuit.
The lawn mower stalls at high engine speeds
During operation, a situation arises when, when you press the fuel mixture supply button, the speed of the unit does not start to increase, but to decrease. A malfunction of this nature can be caused by:
Fuel hoses for lawn mowers with filter
- Etching atmospheric air into the combustion chamber;
- Problems with the circulation of the fuel mixture;
- Clogging of the breather in the fuel tank cap (cleaning the hole with a fine sewing needle);
- Incorrect carburetor adjustment.
When air is leaking during the operation of the internal combustion engine, it is necessary to check the tightness of the connection of the pipes and the integrity of the gaskets in the CPG. The problem with the circulation of the fuel mixture can be solved by removing blockages in the fuel pipes leading to the carburetor. If a vacuum occurs in the tank and the fuel mixture does not flow to the carburetor, it is enough to clean the breather with a thin needle and blow it out with air.
Lawn mower stalls
When purchasing a lawn mower, you need to be prepared for the fact that, like in all other similar tools, breakdowns may also occur in it that will require repair.
However, you should not immediately run to the service center and pay a lot of money to the masters who convince you that there is a serious malfunction in the device.
The lawn mower stalls at high speed on gas
Perhaps the most common complaint with petrol trimmers is the lawn mower stalls.
Of course, a rather serious malfunction can also be the reason for this. However, in most cases the situation is much simpler than it seems at first glance.
To cope with such a problem, first of all, try to figure out its causes on your own, because after finding out the cause, it is much easier to deal with the problem, and sometimes it even self-destructs.
In fact, there are many reasons for this when the lawn mower stalls at high speeds.
Another is the presence of faults in the power supply system.
In this case, the lawn mower will stall at idle speed. A misalignment or incorrect adjustment of the carburetor can lead to problems with the power system.
The misalignment can be caused by vibrations that occur during the operation of the lawn mower.
Incorrectly adjusted lawn mowers can be corrected simply by adjusting it in accordance with the requirements specified in the instruction manual.
In addition, sometimes gasoline trimmers can stall due to the fact that the valve located in the gas tank cap is simply clogged or stuck.
To find out, try using a scythe while loosening the gas cap.
If the device works properly in this mode, clean the valve.
What’s more, the lawn mower can stall due to poor fuel flow to the carburetor.
Why, then, does the device start up, you ask?
The reason for this is that at first the fuel gradually runs into the carburetor and there is enough fuel to operate at increased power.
However, then it is produced and at high revs the engine starts to stall.
As for the carburetor, the problem here may also be that its body is too tight.
Air leaks can also be the reason for the lawn mower stalling at high rpm on gas.
This is the possible presence of a place through which air can pass during the heating process of the engine.
Be sure to check the fuel inlet hose, among other things. The problem may be that it is loose or cracked altogether.
These are the main reasons why a lawn mower can stall.
When heated
The lawn mower often stops when it heats up. At the same time, it starts, works with jerks and gradually stops. This process occurs when the gasoline in the carburetor boils or the damper is installed in a rotary rather than disc type. In the latter case, the part is changed.
It happens that the trimmer heats up if the ignition circuit wire or coil is damaged. In order for the device to start working normally, parts are replaced.
What could have broken
Problems with the lawn mower 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.
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 mower started working at first, but then immediately stalled, then it is possible that 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.
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.
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 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).