The Lawn Mower Stalls At High Speed

lawn mower stalls when you press the gas: causes and remedies

a lawn mower and a gasoline trimmer. 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 trimmer stalls for a while, and the mowing process immediately slows down.

Immediately after the start

The stalling of a lawn mower or trimmer immediately after the start is due to the following reasons:

Imbalance of previously adjusted valves;
Initially incorrect valve train setting;
Clogging of the fuel supply valve by deposits;
Worn or loose hose.

Due to the broken fuel injection algorithm, the lawn mower or trimmer vibrates strongly during operation.

With increasing speed

If the lawn mower (or trimmer) stalls when adding engine speed, check the device for the following symptoms:

Blockage 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;
Excessive 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, the engine burns the amount that it has received since the last stalling, and itself stalls again.

During engine warming up

If the engine heats up too quickly, overheats. the lawn mower or trimmer works unevenly, like a jerk. Then it stalls. The reason may be as follows:

Boiling gasoline;
Ignition wire is damaged (poor insulation)
The coil in the ignition system has noticeably burned out, interturn short circuits have appeared.

The same heating is observed when using a rotary (rather than disc) damper.

When idling

Run the trimmer or lawn mower at idle speed, you find that the device starts. but stalls, After working, say, 5-10 minutes. The reasons may be as follows:

Blockage, violation of carburetor adjustment;
Initially incorrect setting of the carburetor valve mechanism;
Clogged air filter;
Reducing the speed of the gearbox (if any). incorrect ratio of the air-fuel mixture;
Throttle plugging;
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.

Diagnostic features

A well-posed question is already half the answer. The search for a solution will be significantly accelerated by the fact. under what circumstances a gasoline trimmer or lawn mower stalls, 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 soon after starting work at high, near-maximum speeds;
Under heavy load (for example, to cut bushes, mows 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.

Ways to eliminate breakage

By carburetor The following works are possible:

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;
Restoring the tension of the carburetor cable;
Replacing the fuel suction hose, checking and tightening the loosening of the connection;
Change of rotary disc damper;.
Changing a faulty wire or ignition coil.

Main reasons

Possible reasons for the lawn mower or trimmer to stall when attempting to restart and resume interrupted work:

Engine problems;
Failure in the petrol and oil supply system;
Damage to pipelines (capillaries, hoses, nozzles)
Malfunctions in the ignition system.

A general description of scythe or trim problems is not enough here. A clear and immediate repair, high-quality service is impossible without specifying the identified cause.

When gassing

You step on the gas and the trimmer stops working, and does not develop speed. Possible Supposed Cause:

The carburetor setting has gone astray, which appears with an increasing load on one drive. after its long idle time or when working in extreme conditions;
The fuel valve is clogged with deposits;
The carburetor cable is weakened and sagged;
Excessively stretched, possibly torn fuel hose;
The check valve (breather) is forgotten by deposits. the fuel does NOT enter the fuel tank.

Filter check

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, if the fuel filter is bruised, there may be a noticeable drop in the power of the chainsaw at maximum speed, but this is with little pollution.

Air filter

On the pages of the world wide web, you can find information that the Stihl 180 chainsaw may stall due to strong contamination of the air filter. I would like to refute this Not entirely correct information, and inform that the Stihl MC 180 carburetor is equipped with an compensator, 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.

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 “-” and “”.

If the Stihl chainsaw DOES NOT keep the speed and stalls at idle, you can be almost 90% sure that it has irregularities in the fuel pump operation system, as a rule, it is air leaks into the crankcase through the oil pan gasket, or, much more often, through the oil seals crankshaft. Air leaks Reduces or completely stops the impulse, which is supplied 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 speed.

Diagnostics can be carried out using a special device, which is called a vacuum gauge.

The second way to check the performance of the oil seals is to pour gasoline into the engine crankcase and look at them, if the oil seals pass gasoline, 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 seizure of the crankshaft bearings.

The algorithm for checking the crankcase and Stihl 180 oil seals for leaks is as follows:

Removable top cover.
Dismantle the air filter housing and carburetor.
The handle of the chainsaw is removed.
The starter spins and retracts.
On the opposite side from 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 the 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 gear wheel of the drive of the oil pump is removed.

Having disassembled the Stihl MS 180 chainsaw, you can see the oil seals, then you need to fill the crankcase with gasoline and check the leakage. The crankcase can be filled 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 assemble Stihl 180 by following the reverse sequence of the algorithm.

For what reasons the Stihl 180 stalls at idle or full throttle

Any tool capable of Riot salesmen and the Stihl MS 180 chainsaw is NOT an 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.

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 its overhaul.

The second situation is when the Stihl 180 chainsaw worked normally, then gradually lost power for a short time and stalled, while the cylinder overheated. In this case, most likely the reason is air leaks 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 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 the matter is not about the ignition (no spark), since if the ignition is faulty and there is no spark, the tool would simply not start. Means the fuel system remains.

There are a lot of malfunctions in the fuel system, and to determine the exact reason why the Stihl 180 chainsaw stalls when you press the gas, you need to carry out a complete diagnosis. We recommend reading about common malfunctions of the Stihl 180 chainsaw and their elimination.

Carburetor

One of the reasons why the chainsaw develops speed when the gas is pressed, but on the contrary stalls, is a malfunction of the carburetor. Let’s say the Stihl 180 saw worked properly, and then it was put on for a long time and did NOT use it. After it was started, and at idle it works well, and when you press the gas it can stall. Why stalls? The reason is a sticky carburetor injector valve. Of course, this is not 100%, but the probability of such a malfunction is high. We recommend reading an article about the device and repair of the Stihl 180 carburetor.

In order to check the nozzle, it is necessary to remove the carburetor and disassemble it. To remove, it is necessary to Unscrew the two nuts securing the air filter and carburetor, then remove the air filter and the engine control lever, while disconnecting the choke control rod from the carburetor. Next, you need to pull the carburetor slightly towards you, and disconnect the fuel supply hose.

Having removed the carburetor, it must be blown out and cleaned of dirt, only after that the carburetor can be unscrewed.

It is necessary to unscrew the cover of the main chamber of the carburetor, this and on which the compensator is installed on top. Further, using a bolt of 8 mm and a length of at least 50 mm. Knock out the valve.

After the nozzle is removed, you can blow it out with a compressor. The valve should only let air through in one direction, if the valve can be freely blown in both directions, then it is defective and must be replaced with a new one. Collect the chainsaw after the valve has been repaired, it is necessary to follow the reverse sequence of disassembly.

To see clearly how the carburetor is being repaired, or rather, how to properly knock out the injector valve from the carburetor body, you can look.

Another common reason a saw can stall when revving up is air leaks into the carburetor. It is possible to check this only with a special tool, but it is worth noting that if preventive work on the carburetor has not been carried out for a long time, then a new set of gaskets can be installed in the carburetor. In some cases, this helps to solve the problem with its depressurization.

When disassembling the carburetor to replace the gaskets, you need to carefully inspect its needle valve, press the rocker arm and check its lifting. Sometimes, especially after the Stihl chainsaw has stood for a long time with fuel in the carburetor, the needle may burn to the carburetor body and NOT perform its functions. Simply put, the needle valve will not allow the fuel mixture to pass through. In this case, the saw will not work.

If the Stihl MC 180 chainsaw stalls at idle, and does not gain power when you press the gas or even stalls at full speed, it is necessary to diagnose the fuel system and check the crankcase for leaks. You can do it yourself, but you need to have certain skills. If you are not familiar with two-stroke saws, it is better to turn to specialists, since this technique is quite capricious and any mistakes are expensive.

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:

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 winding 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. The weakening of the valve helps to resolve the issue, which ensures free circulation of the mixture in the system.

A stop 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, you should add revolutions to the bit 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 on 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 common problems are contained in the operating instructions. Knowing the reasons why the trimmer stalls should be done in order to effectively repair the device yourself.

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 a carburetor adjustment failure, which occurs under significant loads on the drive, after prolonged inactivity of the mechanism or when it is used in difficult conditions.
Clogged 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 stretch to the point of rupture due to a significant load.
Clogged breather (check valve), as a result of which fuel does NOT enter the tank.

If the problem is with the carburettor assembly, the lawn mower vibrates to recognize it. When the hose bursts or the cable is stretched, these components are replaced.

Idle

At idle, common reasons for trim stopping are as follows:

Dirty, misaligned 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 using an unsuitable fuel mixture;
Clogged throttle;

Air ingress into the system;
Not enough fuel to operate the lawn mowers.

At high revs

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

Clogged or sticking 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;
Leakage 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 body. 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.

When heated

the lawn mower often stops when it heats up. At the same time, it starts up, works “with a jerk” and gradually stops. This process occurs when the gasoline in the carburetor boils or the damper is installed in a rotary rather than a 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.

When the air damper is opened

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

Fuel hose to carburetor

For all Possible causes of the lawn mower stalling and solutions, see the following

There are many reasons for stopping lawn mowers, but the most common malfunctions associated with its carburetor. They can occur in any case. The most problematic option is when a serious breakdown occurs, and you need to purchase new parts or change the lawn mower.

When idling

Run the trimmer or lawn mower at idle speed, you find that the device starts. but stalls, After working, say, 5-10 minutes. The reasons may be as follows:

Blockage, violation of carburetor adjustment;
Initially incorrect setting of the carburetor valve mechanism;
Clogged air filter;
Reducing the speed of the gearbox (if any). incorrect ratio of the air-fuel mixture;
Throttle plugging;
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 the air damper is opened

Fuel hose to carburetor

For all Possible causes of the lawn mower stalling and solutions, see the following

When the air damper is opened

the mower or trimmer stalls when the shutter is raised for the following reasons:

Pumping excess air due to a cracked fuel suction hose;
Oil seals are worn out;
Incorrect operation of the fuel and air metering unit when mixed.

Stop the lawn mowers in this case immediately.

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:

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.

With increasing speed

If the lawn mower (or trimmer) stalls when adding engine speed, check the device for the following symptoms:

Blockage 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;
Excessive 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, the engine burns the amount that it has received since the last stalling, and itself stalls again.

lawn mower stalls or suffocates when you press the gas

Clean all holes on the inside of the carburetor, and most importantly, clean the debris under the fuel mesh.

Another is the presence of defects in the power supply system.

In this case, the lawn mower will stall at idle speed. Misalignment or incorrect carburetor adjustment can lead to a dilemma with the power system.

The misalignment can be caused by vibrations that occur during the operation of the lawn mower.

Incorrect adjustment of lawn mowers can be corrected simply by adjusting it in accordance with the requirements indicated in the annotation for use.

Apart from that, 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 to use a scythe, loosened the gas cap.

If the device operates properly in this mode, clean the valve.

over, the lawn mower can stall due to the disgusting flow of fuel into 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.

But 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.

We are talking about 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 is loose or cracked altogether.

These are the main reasons why a lawn mower may stall.

Immediately after the start

The stalling of a lawn mower or trimmer immediately after the start is due to the following reasons:

Imbalance of previously adjusted valves;
Initially incorrect valve train setting;
Clogging of the fuel supply valve by deposits;
Worn or loose hose.

Due to the broken fuel injection algorithm, the lawn mower or trimmer vibrates strongly during operation.

At high revs

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

Clogged or sticking 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;
Leakage of atmospheric air;
The fuel intake hose is cracked or loose.

The trimmer stalls at high speeds

This article will solve the problem of lawn mowers when they stall at high rpm on gas

When purchasing a lawn mower, you need to be prepared for the fact that, as in all other similar tools, breakdowns may also appear in it, which will require repair.

But you should not immediately run to the service center and pay big money to the masters, convincing you of the presence of a severe malfunction in the device.

Sources:

http://benzopilok.ru/brend/stihl/ms-180-glohnet-na-holostom-polnom-hodu.html
http://tehnika.Expert/dlya-sada/trimmer/gloxnet-pri-nazhatii-na-gaz.html
http://mahnem-ru.ru/trimmer-glohnet-na-bolshih-oborotah/

Lawn Mowers high, lawn, mower, stalls