The lawnmower crushes when you step on the gas

Causes of power loss in the brushcutter. The lawnmower doesn’t develop full power

Grass trimmer that has a gasoline drive is a useful thing for owners of homesteads, lawns, and when the grass trimmer suddenly stops, the work of clearing the area of grass stops. The device itself is a fairly complex mechanism, so there are many different reasons for its failure. The most frequent malfunctions are contained in the instruction manual. Know the reasons why the grass trimmer stalls, it is necessary to effectively perform the repair of the device on your own.

Troubles with the chain saw, related to the fact that this device does not start, are classified in a certain way by service specialists. These include faults with the following parts of the mechanism

  • engine, in which the piston and bearings can wear out or fail, crack the crankcase;
  • The fuel system, with a possible clogged filter or problems with the carburetor;
  • mechanical damage to leads, tubes, hoses;
  • the ignition chain.

To correctly determine the node where the breakdown occurred, it is necessary to pay attention to the circumstances under which the grass trimmer stalls.

Adjusting and tuning the carburetor

Maximum and minimum engine speed, even idle speed can be adjusted with a carburetor. The stable operation of the lawnmower depends on the amount of fuel mixture and air fed, their ratio. The lawnmower will not start if the carburetor is out of adjustment. The adjustment of the fuel feeder for low speed (L), high speed (H) and idle speed (T) is regulated with the same-name screws:

  • The chainsaw has to be in operation for at least 10 minutes, because the adjustment has to be done on a hot.
  • Turn the screw H slowly up to the maximum RPM and then turn it ¼ turn counterclockwise to reduce the engine RPM.
  • Adjust the idle speed with the screw T so that the grasshopper does not rotate.
  • Adjust the L screw by first opening the throttle as much as possible and then slowly lowering the rpm to a steady minimum.

After adjustment, a serviceable carburetor with cleaned filters, checked ignition should allow the engine to run. If the carburetor is faulty, after repairing it, you will need to adjust the supply again before starting the lawnmower.

Rare breakdowns that prevent a lawn trimmer from working can be:

Even if your grass trimmer won’t start after all this abuse, you can’t do without disassembling the carburetor. It may very well be that it was the needle’s trap in the carburetor. At idle, the carburetor stalls. When it gets hot its grass trimmer immediately throttles why does it throttle. Why does the hot engine stall? ? Why does the grass trimmer go off when it’s hot?? Hitachi. In any case, you should disassemble and wash this capricious mechanism.

In general, when the grass trimmer began to be capricious and glows, it is advisable to conduct a complete preventive maintenance: completely change the fuel mixture, try a different oil, as well as mandatorily change the spark plug. Practice shows that in many cases cheap low-quality plugs are to blame.

We looked at the most common reasons why the trimmer does not start. If it is something more “exotic”, you need to go to the service center. Smaller and more obvious breakdowns you are sure to find on your own.

At high revs

When the grasshopper stalls at high rpm, it is due to the following problems:

  • the valve located on the fuel tank lid is clogged or jammed;
  • the carburetor has become unadjusted due to the vibrations that occur during operation of the mechanism;
  • problems with fuel mixture circulation;
  • atmospheric air inflow;
  • the hose intended for fuel intake is cracked or poorly connected.
See also  Oil to gasoline ratio for the lawnmower

The carburetor is being adjusted. The trimmer’s operating instructions are to be consulted. It is often enough to loosen the tightening of its body to adjust it. If there are problems with the circulation of the fuel mixture, it may slowly flow into the carburetor. After its depletion the engine stops at high revolutions.

At idle speed

At idle speeds, common causes of grass trimmer stopping are as follows:

  • reduction in gearbox revolutions when it gets hot, which is a consequence of using an unsuitable fuel mixture;
  • clogged throttle valve;

If the problem area is the carburetor, the technique will stop both “cold” and “hot” starting.

At high rpm

When the grasshopper stalls at high speeds, it is due to the following problems:

  • The carburetor has become misaligned due to vibrations from the mechanism;. The carburetor has become misaligned due to vibrations from the mechanism;. The valve on the gas tank lid is clogged or stuck;
  • carburettor is disturbed by the vibrations produced by the mechanism;
  • fuel mixture circulation problems;
  • atmospheric air inflow;
  • the hose that is intended for the fuel intake is cracked or poorly connected.

The carburetor is adjusted based on the trimmer’s operating manual. it is often sufficient to loosen the choke body. If there are problems with the circulation of the fuel mixture, then it may slowly flow into the carburetor. After its depletion, the engine stops at high revolutions.


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

When putting the grass trimmer in storage, it is worth filling the gearbox with enough oil. Then you need to clean the air filter, partially disassemble, purge and wash can be 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 plug hole and crank the crankshaft. If you plan to store the gasoline trimmer for the grass in the off-season is not in the house, it is recommended to wrap the engine unit tightly with an oily rag. This will avoid the development of corrosion on the surface of important nodes of the mechanism.

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

  • Reduction of gearbox revolutions when heated up, which is a consequence of using an unsuitable fuel mixture;
  • clogging of the throttle valve;

If the problem place is the carburetor, then the equipment will stop both at “cold” and “hot” start.

What to do if the engine does not start?

If the lawnmower fails to start, the first thing to check is the fuel in the tank and its quality. For refueling it is recommended to use quality gasoline that has been purchased at gas stations, the brand name of which should be no lower than АI-92. Saving on cheap fuel can cause damage to the cylinder and piston assembly, which can cost a third of the value of the brushcutter. It is equally important to properly prepare a fuel mixture of gasoline and oil. The proportional ratio of these components of the mixture is specified by the manufacturer in the manual. You should not prepare the fuel mixture in large quantities, because during long storage its properties are lost. It is best to use a freshly prepared mixture.

When preparing the fuel mixture, oil is poured into the gasoline using a medical syringe, allowing you to exactly observe the required proportion of components

If the fuel filter in the tank is dirty, it can also prevent the lawnmower engine from starting. If you have any problems with starting the engine, check the condition of the filter. Replace the filter if necessary. Do not leave the inlet without the fuel filter.

See also  What kind of lawnmower to choose a gasoline self-propelled. Buying Guide

The air filter also needs checking. If soiled, the part is removed, washed in gasoline in the field and put back in place. In the country house or at home the filter can be washed in water, using detergents. Rinse, squeeze, and dry afterward. the dried filter is moistened with some of the oil used to make the fuel mixture. Excess oil is removed by squeezing the filter with your hands. Then put the part back in place. The removed cover is put back and fastened with screws.


The air filter, washed in fuel mixture, squeezed and dried, is installed in its place in the plastic housing and closed with a cover

How to do this procedure in more detail you can see at

If all the above procedures are performed, and the engine does not start, then adjust its idle speed by turning the carburetor screw. In the video at the beginning of this article we can see how to do this.

  • lay the tool on its side so that the air filter is on top. This positioning ensures that the fuel mixture will flow exactly to the bottom of the carburetor. The engine will start on the first try if you remove the air filter and pour a few drops of mixture into the carburetor before starting, then put the removed parts back in place. Method tested in practice.
  • If the first tip does not work, then the problem is probably the spark plug. In this case, unscrew the spark plug and check its function and dry the combustion chamber. Replace a spark plug that is showing no signs of life.
  • If the spark plug is in good condition, the filters are clean and the fuel mixture is fresh, you can use the universal way to start the engine. Close the carburettor choke and pull the starter grip once. Then open the choke and pull the starter 2-3 more times. Repeat the procedure three to five times. The engine will definitely start.

Some with such force pull the handle that you have to make repairs on the starter lawnmower with their own hands. This is only possible if the cable is torn or the cable grip is broken. In other cases it is recommended to replace the starter motor. The starter motor is sold as a complete unit.

The lawnmower stops when you press the gas, how to fix the breakdown

There can be a huge number of reasons why your lawn mower stalls. we offer the most common ones, and hope you find yours, and of course, fix it. So, one of the situations is a clogged air valve, the hole behind which the fuel is atomized. If there is something stuck in it, it can be usually removed quickly and easily. This is the easiest cause, as well as a clogged filter. It should be flushed in solvent and then blown well with compressed air. If it can not be repaired. then order a new one in the spare parts store KosiKosa.

Similarly, if you press the gas pedal, the tool stalls because the actuator is clogged. It is also possible that the fuel is not coming out to its full capacity, so it is necessary to check or replace the fuel filter. Other possible causes of the brushcutter stalling when you give the gas are:

To all these reasons for the machine stalling when adding gas, we’ll add some useful recommendations on how to handle the mower. First of all, before you start working with any technique, you need to read the instructions. In this case, the consistency of gasoline and oil, competently prepared by you, as well as do not overheat the machine, and do not leave gasoline for the winter, when you simply will not use the machine.

See also  How to reduce the speed of a self-propelled lawnmower. Getting ready to work and testing

How well all the parts work together is important for the full performance of any tool. And if it’s one thing, it’s the other. the piston or carburetor in the other. Owners of brushcutters, wishing to use their tool at full power, need to understand that under the load, for which the capabilities of the machine are not designed, can simply break the entire mechanism or its individual parts. So only a competent and moderate operation involves long productive work of any gasoline tool.

The grass trimmer stalls at idle speed. causes and solutions

To the common situations, why the grass trimmer or lawnmower stalls, it is worth referring to its operation at idle speed. Let’s go straight to the causes:

  • the reducer is heating up and the revs on the drum are dropping because the gasoline solution has not been properly prepared;. the throttle is clogged. The necessary proportion of 1:4;
  • contamination of the carburetor;
  • the throttle plate is clogged;
  • when opening the choke (if you did such an experiment) the air flow makes the mixture “poor”;
  • carburettor misfiring;
  • clogging of the air filter;

Insufficient amount of fuel, which is needed to operate the gasoline tool will cause a situation where at high revolutions, when increasing. the grass trimmer works, and at idle stalls. In the situation with the carburetor. the device will stall on a cold start and “on hot”. For any brushcutter user. professional and amateur, it is important to understand that any malfunction of the tool can depend on the petty flight of a part, a loose mount or blockage, as well as a global breakdown of an important part of the mechanism.

The summertime is here and the outdoors is packed with brushcutters. It’s a great tool for everything. it’s powerful, it’s mobile. With gasoline grass trimmer you can cut the grass, and get rid of dried weeds. But it happens that the lawnmower doesn’t start or works intermittently, without developing full power. There’s not much to do! As FORUMHOUSE users say, “you pull the starter handle more than you mow”. Why the grass trimmer does not start, and how to deal with this, is solved in this article.

Why the STIHL electric grasshopper does not develop its full performance

When using an electric trimmer for grass can also have problems with the speed. Here the reasons are completely different from those of fuel-powered scythes.

You can fix it yourself

The electric grass trimmer does not develop the required power, because:

  • The voltage in the network is below the required minimum for the device more than 10%;
  • The softstarter has malfunctioned (if fitted)
  • a defect has occurred in the brush unit;
  • the motor winding has become fried;
  • rotating parts can become jammed.

To adjust the voltage it is advisable to check the motor power first. If it does not comply with regulations, increase it with the help of a stabilizer.

Have the softstarter repaired by a service center only.

If the brushes are worn then simply replace them. When installing new ones, it is advisable to clean all surfaces they come into contact with.

If you want to adjust the voltage you’d better check the power first.

If motor windings are burning up, the electric motor must be changed.

Jamming of the rotating parts can occur for various reasons. To get rid of them, the entire drive unit must be reconsidered.

The latter problem can also occur with another machine from this company, the STIHL pruning shears, and sharpening the disc on the shears is the solution.

| Denial of responsibility | Contacts |RSS