Grass cutter stalls when you press the gas

Causes of power loss in brushcutter. Lawn mower does not develop full power

Any person, who owns a garden or a plot of land, is well aware of the problem of dealing with excessive vegetation. Now come to the aid trimmer for the grass, which has successfully replaced in this field usual scythe. This unit is very convenient in operation, but he, like any mechanism, because of poor working conditions or incorrect operation tend to fail. It is quite common when the grass trimmer does not pick up speed. To understand this problem, it is necessary to understand some aspects related to the functioning of the machine.

All grass trimmers are classified according to the type of power supply: gasoline or electricity (from the network or battery). It should be noted that gasoline mowers are superior to their electric and battery-powered counterparts in many respects. Despite the fact that they all perform similar functions, the difference in performance, maneuverability and efficiency is very noticeable. However, the general principle of operation of all types of manual mowers almost does not differ. the devices are equipped with engines (two- or four-stroke combustion engines or electric motors), which set in motion the cutting unit (spool with a fishing line or a metal disc). All of the components are mounted on a straight or curved boom, including the trimmer’s control handle, which holds the main buttons.

Since the problem of weak revolutions is more characteristic of gasoline versions of trimmers, they will receive more attention. So, the lawnmower is very comfortable to work with and unpretentious in maintenance. In this case, most of its faults are caused by the ignorance of the user of elementary things, which are written in the instruction. It is therefore necessary to carefully read the manufacturer’s manual before operating the machine. In particular, to start the engine, you must do the following sequential steps

  • turn on the ignition button;
  • press the silicone button several times to pump the gasoline;
  • close the air damper;
  • set the throttle lever in the high rpm position;
  • at first make slight jerks with the starter handle to feel the resistance of the engine, then yank sharply.

If the lawn mower starts but stops, turn the choke shutter to the intermediate position and try again. When the engine starts, you have to turn off the throttle and open the choke, because the grass trimmer only works on the accelerator.

grass, cutter, stalls, press

Important! The operation of the grass trimmer depends on various environmental influences. In hot weather the unit should be given more time to cool down. When working in conditions of dense thickets or high vegetation, the engine also overheats strongly. It is necessary to take five minute breaks every 15-20 minutes.

Causes of the grass trimmer’s weak revolutions

If users complain about the grass trimmer that does not pick up speed, it means that at idle it works fine, but when you step on the gas it does not develop the necessary power. This can happen as a result of long idle time without activity. These problems are typical for gasoline machines, including Husqvarna 128r, STIHL FS 38 and Hitachi different modifications.

Working with a trimmer, you need to monitor the trimmer all the time. the fall in rpm and unusual noises indicate malfunctions in the machine. The grass trimmer is floating after you throttle it. In such cases, the work should be suspended immediately, let the mechanism cool down and start searching for possible malfunctions. The reason of such overheating is the following:. It can be of different nature, both technological and external factors associated with the conditions and peculiarities of using the machine.

External factors

Several factors, unrelated to its breakdown, influence the decrease in the lawnmower’s speed:

  • contamination of the filter due to particles of dirt and dust entering the filter;
  • the use of low-quality fuel;
  • Incorrectly prepared mixture (relevant for trimmers with two-stroke gasoline engines);
  • Contamination of the muffler screen with particles of vegetation, soil elements and other objects.

In the second and third cases, formation of soot in the combustion chamber and clogging of carburetor elements.

Technical problems

Technical problems with the lawnmower mostly have to do with the fuel system and the ignition system. You can deal with them yourself.

  • When the hand mower won’t start or stops, the problem may be related to the spark plug. Dark soot indicates poor carburetor adjustment and low-quality gasoline.
  • The cause of incorrect operation of the grass trimmer can be a clogged fuel hose. The filters also often get clogged.
  • Another internal problem. the muffler is covered with soot. It causes the grass trimmer’s speed to drop drastically. The solution is to clean the muffler.

Important! If the machine does not operate because of engine trouble, there can be serious problems. In this case, the only problem you can fix with your own hands is the destruction of the piston rings. If there are more serious problems with the engine, if there is no warranty, you should be prepared to visit a workshop.

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Where to look for the problem or where to start looking?

All chainsaws have a similar design, and work on the same principle. You can read about the chainsaw’s construction in this article. Does not play a huge difference what brand of tool STIHL, Husqvarna, ECHO, Champion, Partner, Sturm and others. Failure, which appears in the form when the chainsaw stops when you press the gas, can appear idyentically as expensive and high-quality tools, and on the economical Chinese devices. If the problem has appeared, it must be solved.

A chainsaw is a system of devices made up of parts. No matter what part in the mechanism can fail, leading to partial or complete failure of the tool. If the tool starts the engine, it does not mean that the chainsaw is 100% serviceable. When the increase in rpm stops the work of the engine, it means there are proper prerequisites. In the case of this fault, you should first direct your attention to the following devices:

  • Check the gas tank to see if the fuel is still in the tank. If there is enough fuel, you should also check the serviceability of the fuel filter, the presence of the connection of the supply hose to the carburetor, and make sure that the breather is working

These are the main parts and mechanisms that should be checked first, if there is a malfunction, when the gasoline saw stalls when you press the gas pedal. There are also other reasons why the chainsaw engine stops when the throttle trigger is pulled. What else can contribute to the appearance of this malfunction, as well as features of troubleshooting, we will find out next.

When the throttle is pressed

If the lawnmower stops when the throttle is depressed, this can be due to.

  • The most common variant is a failure of carburetor adjustment, which occurs when the drive is heavily loaded, after prolonged inactivity of the mechanism or when it is used in harsh conditions.
  • Clogging of the fuel valve, which is eliminated by loosening it, resulting in the gasoline begins to flow normally through the system.
  • Loose or hanging cable in carburetor. The fuel hose can also become stretched or even burst when subjected to high loads.
  • Plugging of breather valve (check valve), and as a result no fuel flows into the tank.

If the problem is related to the carburetor assembly, you can recognize it by the appearance of vibration of the lawnmower. If the hose or cord breaks, replace these components.

When the throttle is depressed

If the lawnmower stops when you press the gas, the causes may be.

  • The most common variant is a failure of carburetor adjustment, which occurs when the drive is heavily loaded, after prolonged inactivity of the mechanism or when it is used in harsh conditions.
  • Clogging of the fuel valve, which is eliminated by loosening it, as a result of which gasoline begins to flow through the system normally.
  • The cable in the carburetor is loose and hanging down. The fuel hose can also become stretched or even burst when subjected to high loads.
  • The breather plug (check valve) is clogged and as a result the fuel does not flow into the tank.

If the problem is related to the carburetor unit, it can be recognized by the appearance of lawnmower vibrations. When the hose bursts or the cable is stretched. perform the replacement of these components.

At high revs

When the grass trimmer stalls at high revolutions, it is due to the following problems:

  • If the problem is caused by a clogged or jammed valve on the gas tank lid;
  • the carburetor is disturbed by the vibrations that occur during operation of the mechanism;
  • problems with the circulation of the fuel mixture;
  • Atmospheric air intake;
  • The fuel intake hose is cracked or loose.

Adjust the carburetor according to the instruction manual of the trimmer. It is often sufficient to loosen the tightening of its housing for adjustment. If there are problems with the circulation of the fuel mixture, it may slowly flow into the carburetor. After ploughing, engine stalls at high rpm.

grass, cutter, stalls, press

lawn mower stops working at high engine speeds

A situation occurs during operation when the unit speed begins to decrease, not increase, when you press the fuel button. Failure of this character may be caused by:

Fuel hoses on the brushcutter with filter

  • The air bleeding into the combustion chamber;
  • malfunctions in the circulation of the fuel mixture;
  • by a clogged breather in the fuel tank cap (cleaning the hole with a fine sewing needle);
  • improper carburetor adjustment.

If the internal combustion engine is bleeding it is necessary to check the tightness of connection pipes and the integrity of the gaskets of the cylinder block. The problem with the circulation of the fuel mixture can be solved by removing clogging in the fuel pipes leading to the carburetor. If there is vacuum in the tank and no fuel mixture to the carburetor, it is enough to clean the breather hole with a fine needle and blow it out with air.

lawnmower does not develop revolutions.Another reason

the analogue of the Hupsqqunan does not develop revolutions the cause turned out to be very simple (see the video)

If you have performed filter operations, but the work of trimmer for grass, working on gasoline, remained the same, gasoline trimmer does not pick up speed, what to do??

Then you should try to remove the filter from the device in order to provide the so-called “relief” of the grass trimmer. Why the Chinese lawnmower does not develop revolutions, the reason Husqvarna. Should help.

The next and pretty common problem when working with a gasoline trimmer is that it just stops, and does not give any sign of life.

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In this case, the problem may be as follows:

The last and most common reason for the breakdown of the gasoline grass trimmer is that the cable, which is located in the carburetor department, just slept.

So make sure in advance that it is well stretched, but not to the limit, otherwise when too much load on the gasoline grass trimmer, this little rope can crack and then you will definitely have to go to the service center, and then even throw a lot of money down the drain.

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at high revs

When a grass trimmer stalls at high speeds, it is due to the following problems:

  • clogging or jamming of the valve located on the gas tank lid;
  • carburetor razregulirovaniya under the influence of vibrations arising during the operation of the mechanism;
  • problems with the circulation of the fuel mixture;
  • Atmospheric air intake;
  • the hose intended for fuel intake is cracked or weakly connected.

Adjust the carburetor according to the instruction manual of the trimmer. To adjust it, it is often enough to loosen the tightening of its body. If there are problems with the circulation of the fuel mixture, it can slowly flow into the carburetor. After the exhaustion of the engine stops at high revolutions.

Recommendations for storing a gasoline grass trimmer in the off-season

Putting the trimmer for grass in storage, it is worth to fill the gearbox with a sufficient amount of oil. Then it is necessary to perform cleaning of the air filter, partially disassemble, blow out and wash the engine of the machine. After drying all mechanisms, you should lubricate the moving elements. To perform oil treatment of the piston system, you must first remove the spark plug. Then you need to move the piston to the outermost position, then pour a small amount of oil into the spark plug hole and make a cranking of the crankshaft. If you plan to store the gasoline trimmer for grass in the off-season is not planned in the house, it is recommended to wrap the unit’s engine tightly with oiled rags. This will avoid the development of corrosion on the surface of important components of the mechanism.

At idle speeds, common causes of grass trimmer stoppage are the following:

  • Reduced gearbox rpm when the gearbox gets hot, which is a result of using an unsuitable fuel mixture;
  • clogging of the throttle valve;

If the problematic place is the carburetor, the technique will stop both at “cold” and “hot” start.

Diagnostics of the spark plug duct

What to do if the fuel mixture used is fine, but still does not start the grass trimmer gasoline? The reasons for the failure of the mechanism may lie in excessive moisture in the candle channel. To diagnose and correct the problem you need to do the following:

  • Unscrew the spark plug. Wipe it thoroughly and then dry it.
  • Drain the excess fuel in the chamber through the appropriate spark plug hole.
  • Clean the old spark plug if there is soot on its surface. Use a regular nail file or a nail file to do the job.
  • When installing the element in place, set the gap of 1 mm. To check the parameter it is enough to put any coin in the gap.
  • Assemble the functional unit back.
  • Try to start the grass trimmer.

It is advisable to dry the candle channel for at least half an hour. However, it is by no means necessary to resort to burning its elements. After all, the heating of the spark plug can lead to its final damage. What to do if the maintenance of the functional unit has been performed in accordance with the above recommendations, but the grass trimmer does not start, there is a spark at the same time? In this case it is worth to treat the threaded joints with gasoline. The latter does not need to be abundantly impregnated with fuel. It should only be slightly dampened. To resort to such actions should be to ensure ignition. After all, no matter how strong the spark is provided by the spark plug, there will simply be nothing to ignite in a completely dry chamber.

If even in this case, the grass trimmer does not start, it is worth evaluating the quality of contact between the high-voltage wire and the spark plug. If there is no spark (in the presence of a reliable connection between these elements), most likely, the problem is caused by a failure of the ignition unit. In this situation, you will have to seek the services of a handyman to reinstall the assembly.

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How to diagnose the spark plug duct

What to do if the fuel mixture used is fine, but still does not start the grass trimmer gasoline? The causes of mechanism failure can be hidden in the excessive moisture in the candle channel. To diagnose and correct the problem do the following

  • Unscrew the spark plug. Wipe it thoroughly and then dry it.
  • Drain the excess fuel in the chamber through an appropriate candle hole.
  • Clean the old spark plug, if there is soot on its surface. Use a regular lady nail file or a nail file to do the job.
  • When installing the element in place, set the gap of 1 mm. To check the parameter it is enough to put any coin in the gap.
  • Reassemble the functional unit.
  • Try to start the trimmer for grass.

It is recommended that the spark plug channel be dried for at least half an hour. However, you should by no means resort to heating its elements. After all, the heating of the spark plug can lead to its final deterioration. What to do if the maintenance of the functional unit has been performed in accordance with the above recommendations, but the grass trimmer does not start, there is a spark at the same time? In such a case, it is worth treating the threaded joint with gasoline. The latter does not need to be abundantly impregnated with fuel. It should only be slightly dampened. This is necessary to secure the ignition. After all, no matter how strong the spark plug gives a spark, in a completely dry chamber will simply not be anything to ignite.

If even in this case, the grass trimmer does not start, it is worth evaluating the quality of contact between the high-voltage wire and the spark plug. If there is no spark (if there is a reliable connection between these elements), the problem is most likely caused by a faulty ignition unit. In this situation, you will have to turn to the services of craftsmen, who will perform the reinstallation of the node.

Immediately after starting

The machine may stall immediately after starting if the carburetor is unadjusted or has been improperly set. this causes an uneven fuel supply. The result is that the device begins to vibrate clearly. For troubleshooting, the carburettor is readjusted according to the instructions for the mechanism.

Also the engine stops when the fuel supply valve is clogged. In such cases, just clean it. If the lawnmower first started, but then immediately stopped, it is possible that the fuel in the carburetor unit comes with some difficulty. Solve the problem by loosening the valve that allows the mixture to circulate freely in the system.

Stopping can also be caused by air sucking in the case of mechanical damage (holes, cracks) of the hose producing the fuel intake. In this case you need to increase the revolutions of the drive to expel the air bubbles from the system faster.

Right after you have started the engine

The unit may stall immediately after starting if the carburetor is displaced or incorrectly adjusted. it causes uneven fuel supply. As a result, the unit clearly vibrates. To eliminate defects, the carburetor is readjusted, following the annotation to the mechanism.

In addition, the engine stops when the fuel valve is clogged. In such cases it is quite easy to clean it. If the brushcutter at first worked, but then suddenly stopped, it may be that the fuel with some difficulty getting into the carburetor unit. The problem can be solved by loosening the valve, which allows free circulation of fluid in the system.

Stopping can also be caused by air leaks if the fuel hose is mechanically damaged (holes, cracks). In this case, increase the speed of the actuator, so as to remove air bubbles from the system more quickly.

grass, cutter, stalls, press

Where to look for the cause or where to start checking

All chainsaws have the same design and work on the same principle. You can read about the construction of the chainsaw in this material. STIHL, Husqvarna, ECHO, Champion, Partner, Sturm and other brands are not important. The defect, that appears in the form of benzosila stops when you press the gas, can occur equally in expensive and high-quality tools, as well as in cheap Chinese devices. If there is a problem, it needs to be addressed.

A chainsaw is a system of mechanisms made up of parts. Any part in the mechanism may malfunction, causing partial or complete failure of the tool. If the tool starts, it does not mean that the chainsaw is completely serviceable. When the engine stops working at higher RPMs, there is a corresponding reason. When this malfunction occurs, it is necessary to pay attention initially to a number of the following mechanisms of the tool:

  • The gas tank. make sure there is fuel. If there is enough fuel, you should also check if the fuel filter is working properly, if the supply hose is connected to the carburetor, and if the breather valve is working

These are the main parts and mechanisms that should be checked first, if a malfunction occurs when the chainsaw cuts out when the gas pedal is depressed. There are other reasons why the chainsaw engine stalls when pulling the trigger. What else can contribute to this malfunction, as well as peculiarities of troubleshooting, we will find out further.