Trimmer Does Not Gain Momentum Stalls Reason

If you put a cable instead of a fishing line, without the possibility of releasing it, securely fixing the two ends of the cable and cutting them off by welding (a drop of melted metal keeps the cable from unraveling). Such a tool “knocks down” the grass at a time. Cuts off shoots up to about a finger thick. Not as afraid of stones as a disc. There is, however, a problem: when worn, pieces of the cable thread break off, and these twisted wires remain in place of the mowing. Stepping on them can cause injury.

But the pieces of the cable left on the field are half the trouble. The line, breaking off, weakens the dynamic shocks on the transmission and the engine, the cable does not give such an opportunity. The result is rapid wear on lawn mowers.

In no case should you store gasoline in a plastic container from under water. When mixing the fuel mixture, a static charge builds up, you can “catch” a spark.

Therefore, at gas stations it is not allowed to fill gasoline in plastic cans, only in metal ones. Before pouring gasoline into a metal canister, it is better to put it on the ground, so static is removed from the body.

But there are situations when simple manipulations with the lawn mower do not help. The engine still won’t start. In this case, it is used to check the power supply and ignition system, guided by the rule “the engine does not work if there is nothing to burn or nothing to set on fire”.

Causes and repairs

I want to share my experience in restoring the required power of the trimmer with a gasoline engine.

Sometime in early June, I began to notice that my trimmer model GT22GES (manufactured by “ECHO”) began to lose its former power.

In the process of work, when mowing grass, even with a slight increase in the load (the grass is higher and thicker), the speed dropped and the work efficiency was no longer what it was before.

Previously, the trimmer did not notice such obstacles at all. With a sharp push on the “trigger” without load, the revolutions increased slowly, as if reluctantly.

Possible causes include dirty air filter, fuel filter, clogged fuel tank drain, spark plug, carburetor, clogged cooling system, clogged exhaust port or muffler.

As it turned out, the list of possible reasons is extensive. where to start?

First, I visually looked at the air filter, drainage hole, air radiator, all this turned out to be in good condition.

Then I decided to look from the end of the list, that is, to check the exhaust system. exhaust channel and muffler.

To do this, he removed the spark plug tip, unscrewed 3 screws and removed the plastic protective cover of the muffler (in the drawing in the Manual under No. 15). Then, unscrewing two long screws, carefully removed the muffler, so as not to damage the two gaskets that are present there.

The premonition did not deceive me. The exhaust channel of the engine cylinder (through which the exhaust gases come out of the cylinder) was 30. 40 percent clogged with carbon deposits.

So this is what turned out to be the reason for the frustration of my trimmer!

This is what the exhaust channel looks like

Carefully, so as not to damage the surface of the piston and prevent foreign products from entering the cylinder (in other words, the very carbon), I completely cleaned the exhaust channel from carbon deposits, carefully blew the channel with a pump.

I used a knife as a tool (but only at the edge of the canal), and in the depth of the canal, a wooden and plastic spatula of suitable sizes.

The muffler turned out to be pretty clean both inside and out.

After assembly, I started the trimmer, warmed it up a little and tried to mow. the engine started up like new, the power increased noticeably, it doesn’t cut the grass, but cuts it (3 mm line).

It’s nice that the device began to work perfectly and doubly pleased that he himself was able to find the malfunction and fix it.

It is likely that such a problem may arise in other models of trimmers, because they all have approximately the same design and all trimmers have an exhaust channel and a silencer.

You can also see the instruction manual for the lawn mower. the lawn mower does not pick up speed, the cause of the malfunction and its elimination

Another one is the presence of faults in the power system.

In this case, the lawn mower will stall at idle speed. The Champion trimmer stalls at RPM. The Goodluck 4300 lawn mower stalls at engine speed. The mower will stall when you press the gas. The lawn mower stalls at high rpm. Misadjustment or improper 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.

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.

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

Construction and Dacha in an understandable language. During the engine run-in period (this is approximately the trimmer operation on 2-3 tanks), the amount of oil can be increased. For example, mix it with gasoline in a 30: 1 ratio.

A small amount of oil mixed with gasoline leads to increased wear of the cylinder-piston group. An excess of oil in the mixture, although not so fatal, is also harmful. Coking of the piston rings, rapid formation of carbon deposits in the combustion chamber, and a drop in engine power may occur. In addition, the muffler mesh screen is coked. Therefore, some users (after the end of the warranty period for the trimmer) recommend dismantling it.

The gasoline used in the lawn mower is AI 92. The brand of gasoline is precisely specified in the operating instructions. You should not try to “force” the engine by pouring 95th gasoline into it. This can cause overheating, erratic trimmer operation and breakage.

It is not recommended to leave fuel in the trimmer tank during extended shutdowns. It is better to end the working day with the entire mixture completely exhausted. If this is not done, then, since the gasoline will evaporate from the engine overnight, and a thin film of oil will remain, the carburetor jets may become clogged. This will cause difficulty the next time you start the engine.

It is also necessary to observe safety precautions when storing fuel. Many people pour gasoline into a plastic water bottle. Is it worth doing this?

The device does not drive well

The most common causes of such a malfunction are:

  • Incorrect wheel drive cable adjustment;
  • Plugged wheel bushings or bearings;
  • Leaking lower engine crankshaft oil seal;
  • Poor or too large drive belt.

It is necessary to start the test by adjusting the wheel drive cable, this procedure is described in detail in the manual for the petrol lawn mower.

It is necessary to move the cable adjustment so that the drive engages with less pressure on the lever. If this does not help, it is necessary to return the cable to its original state, then prepare the mower to replace the belt, all preparatory actions are also described in detail in the operating instructions.

Even the drive wheels connected to the gearbox must, albeit with effort, rotate when they are turned by hand. Another pair of wheels, not connected to the gearbox, should turn much more easily. If the drive wheels cannot be rotated with one hand, it means that the gearbox requires maintenance or replacement, at home this should only be done if you have extensive experience in repairing such equipment.

If the drive wheels do not rotate tightly, then it is necessary to check the condition of the bushings with which they are connected to the mower body, possibly the bushings are clogged with grass. To cope with such a problem, it is necessary to remove the wheels, then pull the shaft out of the bushings and clean all the elements from adhering grass, a detailed description of this operation is in the operating instructions for the lawn mower.

To carry out the following steps, at least a minimum of locksmith and repair experience associated with any motorized equipment is required. If you do not have such experience or you are not sure that you can handle it, it is better to entrust the performance of these works to a specialized workshop or service center.

After draining the oil and gasoline, the gasoline lawnmower is placed on the table, turning the muffler to the bottom or with the wheels towards the top.

Then remove the knife and belt guard (all these operations are described in detail in the operating instructions for the lawn mower) and check the tension of the latter, and also look for traces of oil.

If the belt is very stretched, then it must be replaced with a new one, this can be done independently, however, certain locksmith skills will be required.

If there are traces of oil, then it is advisable to deliver the device to a service center, because special equipment and certain skills are needed to repair it.

Further verification

If the piston moves, then you must first check the fuel supply, for which the spark plug is thoroughly wiped with a dry clean cloth, then screwed into place, and the air damper position regulator is set to the “Off” position, as when starting the engine.

Then move the choke lever to the “On” position and unscrew the candle, which is carefully examined.

Wet contacts indicate that gasoline is entering the engine and an ignition problem, while dry contacts indicate:

  • On carburetor models, a faulty carburetor;
  • On mowers with fuel injection, a malfunction of the entire fuel system.

In both cases, knowledge and equipment are needed for correct diagnostics and repairs, so those who are not versed in such work, it is better to take the device for repair to a specialized workshop.

If fuel is supplied, then it is necessary to check the external condition of the ignition coil and high-voltage wire. If they have cracks or poor contact, both between the wire and the coil, and at the junction of the wire with the spark plug tip, they must be replaced.

If everything is fine, then you need to check the spark, for which you can use both a known-good candle and a bolt of a suitable diameter, which is inserted instead of a candle into a high-voltage wire.

The candle is threaded against the ribs of the engine cooling jacket, and the bolt is positioned so that it does not come into contact with the mower body or its engine anywhere, and the distance from it to the cooling jacket was 1–2 mm.

After that, disconnect any wire going to the ignition switch, then pull the manual starter lever several times or press the electric button and see if a spark appears.

If there is no spark, then the device will not start for one of the reasons:

  • Breakdown or breakage of the ignition coil;
  • The flywheel key is cut;
  • The ignition magnet fell off the flywheel.

Skills and equipment are required to repair these damages, so those who do not have them are better off trusting professionals. If there is a spark, then the problem is in the spark plug, so after replacing it, the engine will start working.

Motor stalls randomly

The most common reasons why the engine stalls during operation are:

  • Dirty air filter;
  • Dirty fuel filter (only for models with a fuel filter);
  • Defective ignition switch (does not fully open the ignition circuit);
  • Damaged insulation of ignition cut-off wires;
  • Defective air damper drive;
  • The tightness of the ignition coil is broken or its winding is broken.
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The initial inspection is carried out in the same way as described in the previous section. If everything is outwardly normal, then they carefully inspect and feel all the wires suitable for the switch that blocks the operation of the ignition system, perhaps the insulation is damaged somewhere and, upon contact with the bare metal of the case, a short circuit occurs, extinguishing the spark.

If the insulation of all the wires is not damaged, then the wires are disconnected from the switch and the engine is checked. normal operation without spontaneous shutdown indicates that the switch must be replaced, if the problem persists, then the search for its causes continues.

If all these actions did not help to find the cause of the problem, then its source is dirt in the carburetor or injection system, this happens when working on poor gasoline.

To cope with such a problem at home, you need special equipment and the skill of repairing fuel systems. If you do not have such equipment and skills, it is better to contact a specialized workshop.

Engine won’t rev or keep revving

The most common reasons why the engine is not picking up speed are:

  • Incorrect position of the choke lever or breakdown of its drive;
  • Dirty air filter;
  • Faulty manual accelerator control system.

At home, without special equipment and skills, you can only check:

  • Air filter condition;
  • Operation of the choke lever (only on those models where the air damper position is manually adjusted);
  • Manual accelerator control system, that is, a special lever on the folding handle and a cable connecting it to the carburetor.

Checking the condition of the air filter and flushing it is described in detail in the mower’s manual, and we examined the check of the throttle position regulator in the previous section.

To check the manual accelerator control system, you need to set the lever to a position where the engine speed will correspond to that required for mowing, then mark its position with a marker and, after waiting for them to decrease, compare the position of the lever relative to the mark.

If the lever matches the mark, then the problem is much more serious and you need to contact the service, if the lever has moved, then you need to replace it.

Some inexpensive Chinese devices are supplied with a factory defect, including an incompletely assembled air damper actuator or improper adjustment.

Many modern lawn mowers are equipped with automatic speed control, so they can only be diagnosed in a workshop.

On this topic

In this, the author shows a step-by-step inspection of the lawn mower and how to fix problems with the drive of a self-propelled machine:

Doesn’t stop

This happens in two cases:

  • The cable connecting the wheel drive bracket and the bearing squeezing out the belt is sticking or sour;
  • Lost adjustment of the wheel drive cable.

The cable starts to jam when stored improperly or frequently mowing wet grass, when moisture penetrates into the braid and corrosion forms there.

It is advisable to carry out such maintenance annually, regardless of the cable jam, only the oil volume must be reduced by 2–3 times. This will protect the inside of the braid and the core from moisture, which will make the cable last much longer. If this does not help, then it is necessary to adjust the actuator as described in the operating instructions.

Engine won’t start

There are quite a few reasons why the engine does not start:

  • Empty fuel tank;
  • Clogged air filter;
  • The muffler is clogged;
  • The ignition switch is in the wrong position or defective;
  • The choke lever is in the wrong position;
  • Defective candle;
  • Broken or clogged carburetor.

Most common problems

The most common faults are:

  • The engine will not start;
  • The motor stalls arbitrarily;
  • The engine does not pick up or keep revving;
  • Immediately after the start of mowing, the engine speed drops and it stalls or works intermittently;
  • Smokes heavily;
  • Bad rides;
  • Does not stop even after operator releases the wheel drive lever;
  • Shakes violently;
  • Cuts grass poorly.

Initial inspection

To establish the real cause of this defect, you must first carry out a complete visual inspection and make sure that the holes in the air filter or muffler are not clogged, there is gas in the tank, and the throttle lever and ignition switch are in the correct position.

If everything is in order with this, then it is necessary to perform pre-start work, including cleaning the air or fuel filters, described in detail in the mower’s operating instructions, and then try to start again.

After making sure that the engine still does not start, the mower is placed on the table and proceeds to a more detailed search for the reasons.

First, unscrew the spark plug and plug the plug hole tightly with your finger, then smoothly but quickly and strongly pull the recoil starter cable or press the electric start button.

The moving piston must create enough air pressure to push the pin through and out. If this does not happen, then the motor needs serious repairs, which are difficult to do at home, so it is better to take the mower to a specialized workshop.

After all, the reason that the piston does not move after the starter cable or the rotation of the electric starter shaft can be:

  • Breakdown of the starter, due to which it does not transfer rotational energy to the engine shaft;
  • Sheared flywheel key that connects the flywheel and starter to the engine and also ensures the correct ignition angle.

To eliminate both faults, not only tools are needed, but also skill, so those who do not have the skill to repair any engines should not try to fix such problems on their own.

Spark plug problems

When the petrol trimmer is used frequently, the condition of the spark plugs must be monitored. This part is subject to wear and tear, so they need to be regularly inspected for carbon deposits.

There are two ways to solve the problem: clean an old candle from burning or purchase a new one.

In the first case, you need to unscrew and scrub with sandpaper, dry. The distance between the electrodes should be 1 mm. The trimmer is assembled and started.

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In the absence of a spark between the electrodes, it is worth inspecting the quality of the connections of all circuit elements. If everything is fine in this case, then 100% need to change the candles.

Replacing them is easy and inexpensive. From tools you will need a key, file.

Candles should be thoroughly cleaned of plaque.

Low quality fuels

The benzotrimmer does not pick up speed in the case of poor quality fuel. It may stall or not start at all. To check the quality of the fuel, you need to inspect the spark plugs. They are the main indicators for problems with the combustion chamber.

In the presence of sediment formed on the candles, plaque, the old fuel is drained and another, high-quality.

It must be remembered that the trimmer or lawn mower must be filled with good quality gasoline and those brands of fuel that the manufacturer indicated in the technical passport of the device.

Engine problems

Engine problems are more serious. Several variants of the problem are possible:

  • Damaged carburetor;
  • Drive problems.

In the case of a carburetor problem, you should first pay attention to the condition of the cable. It may be weakened, which is what caused the problem. This requires a simple cable adjustment.

If this does not help, then you need to check the usage parameters. The stated performance standards can be found in the technical data sheet of the device. Sometimes it is enough to disassemble the device: wash, clean and assemble.

The trimmer drive is only fully checked if the manipulation of the carburetor does not give the desired result.

Trimmer Does Not Gain Momentum Stalls Reason

Some tricks for working with a petrol trimmer.

The summer time has come, and lawn-mowers as usual rattled on the personal plots. Great tool, powerful and mobile. With the help of a gasoline trimmer, you can cut the grass and get rid of the dried weeds. However, there are times when the lawn mower will not start, work intermittently or not at full power. There is certainly no time for work! And as they say, you pull the starter handle more than you mow.

Launching difficulties arise not only for seasoned lawn mowers, but also for new ones. How to be in this situation? There is only one way out. to listen to the advice of experts and take advantage of their practical experience!

Reasons why the lawn mower does not develop momentum

There are five main reasons why the Stihl trimmer does not develop speed:

Fuel system

The functioning of the fuel system is of great importance for the trouble-free operation of the petrol trimmer. Gasoline passes through all its assemblies and parts, so they must be cleaned regularly. In addition, only high quality fuel must be used. To prepare a combustible mixture in a two-stroke engine, motor vehicle oil cannot be used, since it has insufficient qualities.

lawn mower stalls at high speed
on gas

Perhaps the more common complaint associated with petrol trimmers is: “The lawn mower is stalling.”.

Naturally, a rather severe malfunction may be a prerequisite for this. Why does the trimmer stall when I press the gas? Reasons for stopping the trimmer at high and idle speeds, when heating or opening the air damper. Chinese chainsaw. Repair and trimmer Stihl stalls when it does not start. Gasoline, two-stroke: who knows why and what to do. Why is it not gaining momentum. But in most cases, the situation is even simpler than it seems at first glance.

To cope with such a discrepancy, first, try to figure out its causes without the help of others, because, having found out the reason, it is even easier to fight with a discrepancy, and from time to time it even self-destructs.

Basically, the circumstances are when the lawn mower stalls at high rpm. There are a lot of these circumstances.

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

In this case, the lawn mower will stall at idle speed. Or even the engine fits and it doesn’t matter, the trimmer stalls because of why it stalls. The petrol trimmer won’t start well. At 1 mm, I don’t think that the trimmer cannot understand why it is not gaining momentum. And “Husqvarna stalls and won’t start. Dilemmas with the power system can lead to misalignment or improper adjustment of the carburetor.


The engine is the most important part of any machine. There are several reasons for ICE breakdowns:

  • Incorrect proportions of oil with fuel (for two-stroke);
  • Old fuel mixture;
  • Wear and destruction of the piston ring;
  • Scratch marks on the cylinder and piston;
  • Wearing the device.

All this leads to the fact that the engine either does not start, or stalls.

The echo trimmer does not develop the full power of the cause. The benzotrimmer is not gaining momentum what to do. the lawn mower does not pick up speed, the cause of the malfunction and its elimination

What to do if the petrol trimmer is not gaining momentum

If you have once purchased a trimmer that runs on gasoline, then you probably had to deal with the problem of turning on the trimmer, as well as with such a problem as the gas trimmer does not pick up speed.

That is why this article was created.

So, what to do if a trimmer that has been working for you for more than a year suddenly just stops gaining momentum
, and the motor simply stalls? In this case, you and I should consider a number of problems associated with stopping the motor.

The motor can stall under various circumstances. I have a problem with the Stihl fs38 trimmer, what is the reason for not developing momentum. Sometimes the reason for the improper operation of the trimmer, running on gasoline, is a clogged air filter.

It is the filter that is one of the most important reasons why the gasoline trimmer may stop working.

Various debris very often gets into it, dust particles get there, which also clog the filter, so it needs to be cleaned and washed every month, and maybe more often, it all depends on what power the gasoline trimmer has, as well as how much often you use this device.