lawn mower stalls when you press the gas: causes and remedies
- Diagnostic features
- Main reasons
- When the air damper is opened
- Breakdown elimination methods
- Operating tips
a lawn mower and a gasoline trimmer are machines that do not just mow the grass, but cut it up to several times more than their counterparts with an electric motor. Once the lawn mower or petrol trimmer stalls for a while, and the mowing process immediately slows down.
With an increase in revolutions
If the lawn mower (or trimmer) stalls when adding engine speed – check the device for the following symptoms:
- clogging or sticking of the valve built into the gas tank cap;
- violation of valve adjustment;
- malfunction of pistons and cylinders – from vibration during the operation of the scythe or trimmer, accidental blows directly during the mowing session;
- violation of the supply of the air-fuel mixture;
- extra pumping of air into the motor;
- cracking of the fuel inlet hose, loosening of its connections.
When the air-fuel mixture is supplied in the required portions to the engine out of time, it burns the amount that has been delivered since the last stall, and itself stalls again.
Breakdown elimination methods
The following works are possible on the carburetor:
Weedeater starts but dies. Easy quick fix.
- cleaning and adjusting the fuel supply valve;
- similar work with a valve that releases exhaust gases and vapors (after fuel combustion);
- replacing the weaker spring on the inlet valve;
- restoration of the tension of the carburetor cable;
- replacing the fuel suction hose, checking and strengthening the loosened connection;
- change of the rotary disc damper;.
- replacement of a faulty wire or ignition coil.
The list of work carried out may also include cleaning the injectors (in a 4-stroke engine), replacing valve washers, gaskets in tank plugs, and so on..
Main reasons
Possible reasons for the lawn mower or trimmer to stall when trying to restart and resume interrupted work:
- engine problems;
- failure in the gasoline and oil supply system;
- damage to pipelines (capillaries, hoses, nozzles);
- faults in the ignition system.
How To Easily Fix A Weedeater That Bogs Down
A general description of scythe or trimmer problems is not enough here. A clear and immediate repair, high-quality service is impossible without specifying the identified cause.
When idling
When you run the trimmer or lawnmower at idle speed, you find that the device starts – but stalls after, say, 5-10 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) – the wrong ratio of the air-fuel mixture;
- 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 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.
When gassing
You press the gas – and the trimmer stops working, does not develop speed. Possible suspected causes are:
- the carburetor setting is out of order, which appears with an increasing load on the drive itself – after its long idle time or when working in extreme conditions;
- the fuel valve is clogged with deposits;
- the carburetor cable is loose and sag;
- the fuel supply hose is unnecessarily stretched, possibly torn;
- the check valve (breather) is clogged with deposits – fuel does not flow into the fuel tank.
Important! Malfunctions in the carburetor itself give themselves away by vibration of the lawn mowers.
Diagnostic features
A well-posed question is already half the answer. The fact will significantly speed up the search for a solution – under what circumstances does a petrol trimmer or lawn mower stall, 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 speeds;
- under heavy load (for example, to prune bushes, mow dense and tall weeds);
- when warming up in the cold – it heats up unnecessarily (the lawn mower has stalled due to overheating);
- after opening the air damper.
Depending on which of the circumstances was clarified during the pre-diagnosis, the elimination method looks for a more specific cause of the lawn mower or trimmer malfunction..
When idling
When you run the trimmer or lawnmower at idle, you find that the device will start – but stall after, say, 5-10 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) – the wrong ratio of the air-fuel mixture;
- 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 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.
If stalled after launch
If the equipment starts and stalls immediately after starting, this indicates an incorrect setting or misalignment of the device. As a result, fuel does not flow to the engine evenly, resulting in significant vibration and trim disengagement. To fix the breakdown, it is necessary to reconfigure the device according to the user’s manual..
Another probable problem is a clogged gasoline supply valve. It needs to be cleaned.
On a note! If the trimmer starts but stalls immediately, it may also mean that fuel is not moving to the carburetor with difficulty. The weakening of the valve will help to eliminate the problem – this will ensure uniform and free circulation of fuel in the device..
Another possible cause is a damaged fuel intake hose. Air can enter the system through cracks and holes. To solve the problem, you need to increase the engine speed in order to get rid of air bubbles that have penetrated into the device..
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.
To correctly determine the node where the breakdown occurred, you need to pay attention to the circumstances under which the trimmer stalls.
If stalled under load
Sometimes the trimmer stalls under load because it cannot gain momentum. This means that the cable, which is taut in the carburetor, is loose and slack. If you have experience in repairing this unit, the cable should be tightened.
Another cause of the malfunction is that the fuel intake hose is too tight. Under load, it stretches even more, as a result of which cracks are formed, as a result, the part deteriorates. To eliminate the breakdown, you will need to replace this element.
With an increase in revolutions
If the lawn mower (or trimmer) stalls when adding engine speed – check the device for the following symptoms:
- clogging or sticking of the valve built into the gas tank cap;
- violation of valve adjustment;
- malfunction of pistons and cylinders – from vibration during the operation of the scythe or trimmer, accidental blows directly during the mowing session;
- violation of the supply of the air-fuel mixture;
- extra pumping of air into the motor;
- cracking of the fuel inlet hose, loosening of its connections.
When the air-fuel mixture is supplied in the required portions to the engine out of time, it burns the amount that has been delivered since the last stall, and itself stalls again.
The lawn mower stalls when you press the gas
Gas key lawn mowers
Hole in the fuel cap (breather) of the trimmer
Lawn mowers fuel valve
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 the valve clogging. To do this, it is enough to blow it with a stream of compressed air..
If stalled at high speeds
If the carburetor stalls at high speeds, this means that at idle and low speeds, the incoming fuel is enough for it, but not enough to work at high speeds. Then it is necessary to check the serviceability of the following trimmer assemblies.
- Fuel hose – may have been damaged by cracking. In this case, you need to replace the part. Or maybe you just need to tighten the clamps.
- The filter mesh between the carburetor and the gasoline supply hose – it could be clogged. In this situation, it is necessary to clean the part..
- The valve located on the gas tank cap – it could get stuck or clogged with debris. Cleaning is also needed.
- Carburetor – it may be misaligned as a result of constant vibration. This is usually the case for cheap Chinese parts. To fix the problem, you need to configure according to the instructions. In some cases, it is enough just to loosen the tightening of the carburetor body. If the adjustment fails, you need to install a new element.
- Additionally, you should check the air filter. It may need to be rinsed and cleaned or replaced with a new one, as it could become clogged with dirt and grass particles when the equipment is tilted, when the user mowed in hard-to-reach places.
Diagnostic features
A well-posed question is already half the answer. The fact will significantly speed up the search for a solution – under what circumstances does a petrol trimmer or lawn mower stall, 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 speeds;
- under heavy load (for example, to prune bushes, mow dense and tall weeds);
- when warming up in the cold – it heats up unnecessarily (the lawn mower has stalled due to overheating);
- after opening the air damper.
Depending on which of the circumstances was clarified during the pre-diagnosis, the elimination method looks for a more specific cause of the lawn mower or trimmer malfunction..
lawn mower stalls
When purchasing a lawn mower, you need to be prepared for the fact that, as in all other similar tools, breakdowns may also occur in it, which 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 of a serious malfunction in the device..
the lawn mower stalls at high speed on gas
Perhaps the most common complaint about petrol trimmers is: “The lawn mower is stalling.”.
Of course, a rather serious malfunction can also be the reason for this. However, most often 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, the reasons are when the lawn mower stalls at high speeds, there are quite a few reasons..
Another one is the presence of faults in the power system.
In this case, the lawn mower will stall at idle speed. A misalignment or improper adjustment of the carburetor can lead to problems with the power system..
Vibrations that occur during the operation of the lawn mowers can lead to misalignment..
Incorrect adjustment of 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 by loosening the gas cap..
If the device works properly in this mode, clean the valve.
Moreover, the lawn mower can stall due to poor fuel flow to the carburetor.
Why, then, does the device start, you ask?
The reason for this is that at first the fuel gradually runs into the carburetor and it is enough to work at increased power..
However, then it is produced and at high speeds 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 why the lawn mower stalls at high RPM on gas..
This refers to the possible presence of a place through which air can pass during the heating of the engine..
Be sure to check the fuel inlet hose, among other things. The problem may be that it does not hold well or is cracked altogether..
These are the main reasons why a lawn mower can stall.
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.
To correctly determine the node where the breakdown occurred, you need to pay attention to the circumstances under which the trimmer stalls.
When heated
the lawn mower often stops when it heats up. At the same time, it starts up, works “jerky” 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, replace parts.
Idle
At idle, common reasons for stopping the trimmer are as follows:
- contamination, misalignment or incorrectly adjusted carburetor adjustment;
- clogged air filter;
Replacing the air filter for lawn mowers
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 lawn mowers.
If the problem area is the carburetor, then the equipment will stop at both “cold” and “hot” start.
When you hit the gas
If the lawn mower stops when the throttle is pressed, the reasons may be as follows:.
- The most common option is carburetor adjustment failure, which occurs when the drive is under heavy load, 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 may also be stretched to the point of rupture due to significant stress..
- Clogged breather (check valve), as a result of which fuel does not enter the tank.
If the problem is with the carburetor assembly, the lawn mower vibrates to recognize it. When the hose bursts or the cable is stretched, these components are replaced.
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 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. The weakening of the valve helps to solve the issue, which ensures free circulation of the mixture in the system..
The stoppage can also be caused by air leaks 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..
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 malfunctions are contained in the operating instructions. You should know the reasons why the trimmer stalls in order to effectively repair the device yourself..
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 from 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 referring to the trimmer operating instructions. For adjustment, it is often enough 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.