The trimmer loses speed. Why does the lawn mower stall? Gasoline trimmer stalls at idle

A gas-powered scythe is a useful thing for owners of garden plots and lawns, and when the trimmer suddenly stalls, the work of clearing the area from grass stops. The device itself is a rather complex mechanism, so there are many different reasons for its breakdown. The most frequently encountered problems are contained in the operating instructions. You should know the reasons why the trimmer stalls in order to effectively repair the device yourself.

What could have broken

Problems with a lawn mower, related to the fact that this device does not start, are classified in a certain way by service specialists. They highlight faults with the following mechanism components:

an engine in which the piston and bearings may wear out or fail, or the crankcase may crack;
fuel supply system, in which case the filter may become clogged or there may be problems with the carburetor;
mechanical damage to wires, tubes, hoses;
ignition circuit.

To correctly determine the unit where the breakdown occurred, you need to pay attention to the circumstances under which the trimmer stalls.

Video: Petrol mower gets hot and stalls

Gasoline does not start, spark has disappeared

The disappearance of the spark entails checking the contacts and the correctness of the gap between them, the current-carrying wires to the spark plug and the spark plug itself. To check the spark, unscrew the spark plug, connect a wire to it, insert the plug to the side on the engine cover and pull the starter several times, as if you were starting a brush, looking at the angle and contact of the spark plug, the spark should run between them. If there are no sparks, take a new spark plug to do the same procedure, if sparks are not traced, then the problem is in the wire or contacts, it is better to replace them.

Gasoline spit doesn't give you colds

It is not recommended to press the gas when starting a cold engine. With the brush tilted so that the air filter is on top, press the fuel suction button 5-6 times, set the function lever to the "start" position, pull the starter cord several times to start the engine. After a few seconds of engine operation, turn off the starting system.

Gasoline does not start hot

If the hedge trimmer has been running recently and has not yet cooled down, but does not want to start, press the gas trigger, pull the starter cord sharply several times until the engine starts, and only then release the gas trigger. If a lot of time has passed and the brush has cooled down, it should be started as if it were cold. If the above methods did not help, the purifier did not start, then you should contact the service center.

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Gasoline spit. A useful thing for owners of garden plots and lawns, and when the trimmer suddenly jams, the work of clearing the area of grass stops. The device itself is a rather complex mechanism, so there are many different reasons for its failure. The most common problems are contained in the operating instructions. Know the reasons why kiosk trimmers must be able to effectively repair the unit themselves.

When you press the gas

If the lawn mower stops when you press the gas, the reasons may be the following.

The most common option is a failure of carburetor adjustment, which occurs when there is significant load on the drive, after prolonged inactivity of the mechanism, or when it is used under difficult conditions.
Clogging of the fuel valve, which can be eliminated by loosening it, as a result of which gasoline begins to flow normally through the system.
Loosening and hanging of the cable located in the carburetor. The fuel hose may also stretch to the point of breaking due to significant load.
The breather (check valve) is clogged, resulting in no fuel flowing into the tank.

If the problem is related to the carburetor unit, then it can be recognized by the appearance of vibrations from the lawn mower . When a hose bursts or a cable stretches, these components are replaced.

Carburetor trimmer

What's the result?

As a result, we add that fuel lines, connections and hoses are rubber products. For this reason, you should keep in mind that natural aging of rubber occurs. On cars that are more than 10 years old, cracking of rubber hoses becomes a common occurrence, which leads to air leaks. It should be added that the external condition of such hoses is not a clear indicator of their condition. The inner surface of the walls is also destroyed, which leads to particles entering the injector, carburetor or fuel injection pump, unnoticeable from the outside, especially when the problem occurs in areas behind the fuel filter.

READ Stihl Petrol Mower Not Developing Speed Reason

The main reasons why the engine starts to stall after warming up. Frequent problems with carburetor and injection engines, diagnostics of defects.

The car engine starts and stalls immediately after starting: the main reasons for this malfunction. Diagnosis of probable circumstances, tips and advice.

As a result, jerks and dips occur when accelerating, the car jerks in motion during transition modes. Prerequisites and elimination of defects.

Floating idle speed of the engine “on cool”. Main malfunctions, symptoms and identification of breakdowns. Unbalanced idling of a diesel engine.

Prerequisites for which, after pressing the accelerator pedal, dips appear and the engine begins to swell. Gas engine failures when switching from gasoline to gas.

Why can the engine have high idle speed? The main prerequisites for high idle speeds on an injection engine and engines with a carburetor.

At high speeds

When the scythe stalls at high speeds, this is due to the following problems:

clogged or stuck valve located on the gas tank cap;
the carburetor has become misregulated due to vibrations that occur during operation of the mechanism;
problems with the circulation of the fuel mixture;
atmospheric air suction;
the fuel intake hose is cracked or loosely connected.

The carburetor is adjusted based on the operating instructions for the trimmer. To adjust it, it is often enough to loosen the tightening of its housing. If there are problems with the circulation of the fuel mixture, then it can gradually enter the carburetor. After it is exhausted, the engine stalls at high speeds.

Why does a gasoline trimmer stall?

Gasoline driven scythe. a necessary thing for owners of personal plots and lawns, and when the trimmer suddenly stalls, work on clearing the area of grass stops. The device itself is a rather complex mechanism, therefore there are many different circumstances for its failure. More common difficulties are contained in the instructions for use. You must know the prerequisites for which the trimmer

stalls in order to perfectly repair the device without the help of others.

At idle

At idle, common reasons for the trimmer stopping are the following:

contamination, misadjustment or incorrectly adjusted carburetor adjustment;
air filter clogged;

Replacing the air filter of a brush cutter

Trimmer air filter

reduction in gearbox speed when it heats up, which is a consequence of using an unsuitable fuel mixture;
throttle valve clogged;

air entering the system;
There is not enough fuel to operate the trimmer.

If the problem area is the carburetor, then the equipment will stop both during a “cold” and “hot” start.

Preventive measures and operating rules

In order for the lawn mower to work properly and not stall when starting, it must be stored and operated correctly. Following the following usual tips will allow you to forget about the problems.

When cutting grass, you need to monitor the condition of the cooling system. You also need to frequently clean the channels in the housing and the starter fins.
To clean the instrument, use kerosene, solvent or other cleaning products.
Do not clean a hot instrument; it must cool down before washing.
It is important to follow the recommended operating mode - this will avoid overheating of the motor.
If the scythe is not used within the next 30 days, the fuel must be drained, otherwise it will disintegrate into heavy components that can clog the carburetor channels.
After the fuel has been drained, the trimmer should idle for some time until it turns off. This will completely get rid of the working mixture remaining inside.

To store the instrument in cool weather you need:

Drain the fuel completely;
Disassemble the lawn mower, wash and clean all accessible components;

Inspect the condition of the parts, remove all defects that can be corrected;
Pour the required amount of oil into the gearbox;
Clean the air filter;
Perform partial disassembly of the motor, wash, blow out and carefully lubricate all moving parts;
To lubricate the piston, unscrew the spark plug, then use the starter to raise the piston to top dead center, pour a small amount of oil into the spark plug hole and turn the crankshaft a couple of times.

READ How to Adjust the Carburetor on a Patriot 3055 Trimmer

Only by following these rules can you be sure that the lawn mower will work properly and will not stall over a number of seasons.

As you can see, stopping the trimmer's operation can be caused by a variety of circumstances. Most of them can be corrected independently using user annotations. In cases where there is no confidence in one’s own abilities, it is recommended to take the equipment for repair. It is worth keeping in mind that incorrect actions can cause even more harm to the trimmer. In the end, repairing a walk-behind tractor will cost significantly more money than it would have initially, and in the worst case scenario, you may need to purchase a new unit.

Immediately after starting

The unit may stall immediately after starting if the carburetor is misaligned or incorrectly configured - this causes uneven fuel supply. The result of this is that the device begins to vibrate distinctly. To troubleshoot problems, the carburetor is reconfigured following the instructions for the mechanism.

The engine also stops when the fuel supply valve becomes clogged. In such cases, simply cleaning it is enough. If the lawn mower started working at first, but then immediately stalled, then fuel may be supplied to the carburetor unit with some difficulty. Loosening the valve helps solve the issue, which ensures free circulation of the mixture in the system.

A stop can also be caused by air leaks if there is mechanical damage to the hose (holes, cracks) that takes in fuel. In this case, you should increase the drive speed to quickly expel air bubbles from the system.

Chainsaw won't start when hot

There are no unnecessary phrases in the operating instructions; everything that is offered is aimed at trouble-free operation of the lawn mower. Cleaning all parts after each work cycle allows for easy removal of unhardened residues and dirt. Only cooled components need to be cleaned. This technique contributes to the quality of air cooling of the engine and gearbox.

To refuel, you must use fuel with the oil recommended in the instructions. If the combustible mixture is left in the fuel tank, the oil will float to the surface and land on the damper during startup, impairing its adjustment. The mixture may form sediment and clog the fuel supply in the carburetor.

When storing equipment for the winter, inspect it, lubricate the gearbox and piston system, wrap the entire saw in an oiled rag and store it in a dry place.

It is impossible, as it is dangerous for the tool and the health of the mower, to use a metal cable instead of a fishing line. It cuts more efficiently, but the load on the gearbox and engine increases. When a piece of wire breaks away, it flies at the speed of a bullet. Effective mowing can lead to rapid wear of the engine piston group. For greater mowing efficiency, it is suggested to use a “star” fishing line profile.

The chainsaw does not start when hot.

It is impossible, as it is dangerous for the tool and the health of the mower, to use a metal cable instead of a fishing line. It cuts more efficiently, but the load on the gearbox and engine increases. When a piece of wire breaks away, it flies at the speed of a bullet. Why is it bad when it's hot? If the engine doesn't start well. Why doesn't the trimmer start?

When opening the air damper

It happens that the unit stalls when the air damper is opened, idling normally. This is due to air leaks from the system caused by cracks in the fuel hose or problems with the seals. The carburetor metering system may also malfunction, and the lawn mower will stop after opening the damper.

Fuel hose in carburetor

All possible reasons why the lawn mower stalls and how to eliminate them are contained in the following video

There are many reasons why a lawn mower stops, but the most common are malfunctions associated with its carburetor . They can arise in any case. The most problematic option is when a serious breakdown occurs and you will need to purchase new parts or replace the lawn mower.

In order for the trimmer to work properly for a long time, you must strictly follow the operating instructions. It is necessary to refuel the unit with a fuel mixture suitable for its composition; the device must operate under moderate load.

Causes of malfunction and their elimination

In order to most accurately determine the cause of a malfunction of a trimmer of any brand (for example, Echo ) and find out the possibility of eliminating it, you need to determine what action causes the device to stall . The engine can turn off both at idle and at high speeds, when heated up under load or immediately after starting, etc.

If you stall after applying gas

Owners of petrol mowers often mention that the lawn mower stalls when you press the gas. Typically, such a breakdown occurs due to problems in the carburetor. Failure in its operation can occur due to prolonged storage, use in difficult conditions, or significant overload of the motor. A symptom of such a breakdown will be vibrating movements of the device during operation.

On a note! Users familiar with car carburetor repair can try to restore this important trimmer assembly on their own using the instruction manual. Otherwise, the right decision would be to seek help from service center representatives.

Sometimes the trimmer stalls when you give it gas because the fuel valve is clogged. This interferes with the flow of gasoline. To fix the problem, just loosen the valves. This will restore normal fuel supply to the carburetor.

Another possible reason why a lawn mower stalls when gas is supplied is contamination of the breather (check valve). This part prevents a vacuum from forming in the gas tank. If it is clogged, air does not flow, which means fuel does not flow to the carburetor. To fix the problem, you need to clean this element.

If you stall at high speeds

If the carburetor stalls at high speeds, this means that at idle and low speeds it has enough incoming fuel, but not enough to operate at high speeds. Then you need to check the serviceability of the following trimmer components.

Fuel hose - its integrity may have been compromised due to cracking. In this case, the part needs to be replaced. Or maybe you just need to tighten the clamps.
The filter mesh between the carburetor and the hose for supplying the gasoline mixture - it could become clogged. In this situation, it is necessary to clean the part.
The valve located on the gas tank cap could be stuck or clogged with debris. Cleaning is also necessary.
Carburetor - perhaps as a result of constant vibration, it has become misadjusted. This is usually typical for cheap Chinese parts. To fix the problem, you need to configure it according to the instructions. In some cases, it is enough just to loosen the carburetor body. If the adjustment fails, you must install a new element.
Additionally, you should check the air filter. It may need to be washed 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 mows in hard-to-reach places.

If you stall while idling

If a lawn mower stalls while idling, several factors could be the cause.

First you need to check the prepared fuel solution if we are talking about a four-stroke trimmer operating on a gasoline-oil mixture. There is a possibility that it was made incorrectly - the proportions were not maintained. Because of this, the gearbox heats up and the speed on the drum decreases.
Another likely cause is clogged components such as the throttle valve, air filter or carburetor. These parts need to be cleaned.
Another possible factor is a misaligned or incorrectly adjusted carburetor. You need to re-configure according to the instructions.
This problem can also be observed when the air damper is opened. In this situation, the lack of fuel for the trimmer occurs due to the air flow.

If the device does not have enough fuel, it works properly at high speeds or when they increase, but stalls at idle . If the root of the problem lies in the carburetor, the brush cutter will turn off both during a cold start and during a hot start.

If it stalls after starting

If the equipment starts and stalls immediately after starting, this indicates an incorrect setting or misadjustment of the device. As a result, fuel enters the engine unevenly, which leads to significant vibration and trimmer shutdown. To correct the breakdown, you need to reconfigure the device according to the user manual.

Another possible problem is a clogged valve supplying the gasoline mixture. It needs to be cleaned.

On a note! If the trimmer starts but immediately stalls, this may also mean that fuel is not moving to the carburetor with difficulty. Loosening the valve will help solve 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 to get rid of air bubbles that have penetrated inside the device.

If it stalls when opening the throttle

If the equipment operates properly at idle, but stalls when the air damper is opened, this indicates that air has entered the system through cracks in the fuel supply hose or damaged seals. To correct the breakdown and improve the operation of the tool without air leaks from the atmosphere, it is necessary to replace the damaged parts.

Another possible cause of failure is a malfunction of the carburetor dosing system. To fix this problem, it is better to contact professionals.

If it stalls when warming up

The lawn mower often stalls when it gets hot. It looks like this - the tool starts up, works “jerkily” (not smoothly) and quickly stalls. This situation occurs due to boiling of fuel in the carburetor or an incorrectly selected damper, which should not be a disk, but a rotary one. In the latter case, if an error is detected, the part must be replaced.

The cause of the trimmer heating may be damaged ignition circuit wiring or a faulty coil . A broken unit will need to be replaced with a new one.

If it stalls under load

Sometimes the trimmer stalls under load because it cannot gain momentum. This means that the cable tensioned in the carburetor is weakened and saggy. If you have experience in repairing this unit, the cable should be tightened.

Another reason for the malfunction is that the fuel intake hose is over-tensioned. When loaded, it stretches even more, resulting in cracks and ultimately deteriorating the part. To fix the damage, you will need to replace this element.

If you stall without gaining momentum

If the trimmer does not pick up speed and turns off, there may be several reasons. Most often, the culprit of the problem is a clogged air filter. It needs to be pulled out and cleaned, and replaced if necessary.

On a note! The trimmer could stall without picking up speed due to a carburetor malfunction. The unit must be taken to a service center for repair or replacement.

Another possible malfunction is related to the mechanics of the motor drive. This part of the trimmer must be thoroughly cleaned, and the cables located inside must also be lubricated.

You also need to make sure that the cable in the carburetor has not fallen off. Before starting the trimmer for the first time, you should check this structural element and make sure that it is tightly, but not tightly, tensioned. Otherwise, the cable may crack, which will result in costly repairs.