STIHL 55 mower does not rev up. Lawn mower repair

Reasons for power loss in a brushcutter. STIHL lawn mower does not develop full performance

Anyone who owns a garden or a plot of land is well aware of the problem of dealing with excessive vegetation. Now a grass trimmer has come to the rescue, successfully replacing the conventional scythe in this field. This unit is very convenient in operation, but he, as well as any mechanism, due to difficult working conditions or incorrect operation is peculiar to fail. Situations when the grass trimmer does not gain momentum are quite common. To understand this problem, it is necessary to understand some aspects related to the functioning of the machine.

All grass trimmers are classified by type of power: gasoline or electricity (from 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 is almost the same. the devices are equipped with engines (two- or four-stroke combustion engines or electric motors), which drive the cutting unit (spool with a fishing line or metal disc). All elements 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 typical for petrol versions of trimmers, more attention will be paid to them. Thus, lawnmower is very comfortable in operation and unpretentious in service. Most of its malfunctions are caused by the user’s ignorance of elementary things that are written about in the manual. Therefore, before proceeding to operate the machine, it is necessary to carefully study the manufacturer’s manual. In particular, to start the engine, it is necessary to do the following consecutive actions:

  • turn on the ignition button;
  • Press the silicone button several times to pump the gasoline;
  • close the air damper;
  • throttle lever to set the position for high revolutions;
  • First, you have to do some light jerks with the starter lever to feel the engine resistance, then you have to yank sharply.

If the lawnmower starts but stalls, you must put the air damper in the middle position and try again. When the engine starts, you need to turn off the gas and open the air damper, as the grass trimmer works only on the suction.

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. The motor also overheats heavily when working in dense or overgrown vegetation. It is necessary to take five minute breaks every 15-20 minutes.

Causes of weak grass trimmer revolutions

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

stihl, mower, does, lawn

Always be aware of the trimmer’s capabilities when operating it. speed drop and unusual noises indicate a problem with the machine. Sometimes you can give gas, but grass trimmer floats. In such cases, the work should be suspended immediately, allow the mechanism to cool down and start searching for possible problems. They can be of different nature, both technological and external factors related to the conditions and peculiarities of operating the machine.

External factors

Several factors, unrelated to the mower‘s breakdown, influence the decrease in lawnmower RPM:

  • Contamination of the filter due to dirt and dust particles
  • The use of low-quality fuel;
  • Incorrect mixture (important 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 there is the formation of carbon deposits 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. This can be solved by yourself.

  • When the hand mower does not start or stops, the problem may be related to the spark plug. Dark soot indicates poor carburetor adjustment and poor gasoline quality.
  • The cause of incorrect operation of the grass trimmer can be a clogged fuel hose. The filters also tend to get clogged.
  • Another internal problem. the muffler is covered with soot. This causes the grass trimmer’s RPM to drop drastically. The solution: clean the exhaust silencer.

Important! If the machine is not working due to engine failures, there can be serious problems. In this case, the only damage that can be repaired with your own hands is the destruction of the piston rings. With more serious problems with the motor, if there is no warranty, you should be prepared to visit a workshop.

A little about the manufacturer

STIHL is the name of a group of companies involved in the development, manufacture and sale of construction, agricultural and forestry machinery. Among these companies is VIKING, which manufactures garden tools. Year founded in 1926, location in Weiblingen-Neustadt, Germany.

The products are sold through our own sales and service network of 32 distribution and marketing subsidiaries and approximately 35,000. dealer organizations around the world. In 1971 the brand was the best-selling chainsaw brand on the planet. There are representative offices on every continent except Antarctica. STIHL is always focused on the customer and this has ensured the ultimate success of its products. Company motto “A chain saw is only as good as its service” was already defined by its founder Andreas STIHL.

“Made by STIHL” on the product assures customers of reliability and service. By many developments the company holds leading positions among manufacturers of similar equipment. All innovations are aimed at improving comfort, safety, functionality and environmental friendliness of products made under this brand name. It is recognized by consumers in more than 160 countries.

Choosing electric snow blowers: electric snow blowers

Grass cutters

Many different tools are available for grassland treatment. Choosing such equipment, you need to get acquainted with the range of products. STIHL has the following range of petrol blowers:

  • FS 38, FS 45 C-E, FS 50 C-E, FS55, FS55, FS.
  • FS 70 C-E, FS 94 RC-E, FS 100, FS 120, FS 130, FS.
  • battery operated grass cutters.
  • Working from the network.
  • shrub shears.
  • Shank grass trimmers.

Gasoline grass trimmers of this brand are very popular. When selecting equipment, you need to know all the features of a specific model.

Eliminating the causes of not getting a gasoline pump

The fuel mixture must be prepared with the exact proportions of gasoline and oil. You cannot use any other type of fuel. To prevent dirt from getting into the machine, gasoline should be left in a cup or metal container for at least two days. Do not use plastic containers to store fuel. Oil is measured accurately with a medical syringe without a needle. Use only freshly mixed fuel and do not leave any spent fuel in the tank. If the engine is unruly, the gas stops when you press the gas, it’s probably the fault of the fuel.

STIHL FS 55 grass trimmer lawnmower Doesn’t rev, shuts down, rebuild carburetor Thank you for watching

Repairing the carburetor on your STIHL FS55 lawn mower

Replacing the O-ring, gas pedal in the carburetor of the STIHL FS55 lawnmower (gasoline trimmer).

Gasoline does not start when hot. Pull the throttle trigger and pull the cord sharply several times until the engine starts, then squeeze the trigger. Do not start. specialized repair.

Check the ignition system if the gasoline pump does not start in sequence:

  • remove plug from carbon and dirt, dry it, set the gap to 1 mm;
  • connect to the high voltage wire and check the spark by pulling the starter several times;
  • if there is no spark, check the integrity of the high-voltage wire;
  • replace the spark plug;
  • dry the spark plug conduit;
  • At the same time check the operation of the ignition coil, it is defective if the working spark plug does not spark.

If faulty, gasoline pump ignition coil does not start hot, stalls, runs intermittently.

Cleaning or replacing the air and fuel filters will ensure the proper flow of ingredients into the carburetor. Air filter can be washed in soapy water or replaced. If nylon cloth is used, wash it, replace the porous felt filler. Fuel filter is changed carefully, leaving the intake nozzle open. Is it necessary to replace the air filter, is it possible to start the engine with the air cleaner removed. Do I need to change the grid on the fuel supply, if the gasoline pump does not start, you will be told by a dry spark plug.

Breather, the hole for the air supply to the gas tank. If it is clogged, a vacuum is created in the tank and the mixture does not enter the carburetor. The hole can be blown with air or cleaned with a needle. The exhaust duct must be cleaned, it is necessary to remove the muffler’s wiping mesh.

Why does the lawn mower stall at idle speed

Users often ask about stopping the lawn trimmer “on hot”, i.e. when the machine starts, works for a while, and then stops, stalls. The reasons for this situation are as follows:

  • carburetor choke problems;
  • The gasoline in the carb can even boil over;
  • If the ignition is damaged, the grass trimmer will also become hot and stall.

In each of these situations, check the parts for durability, and if they have outlived their time. order new ones from specialists. One of the most popular situations is that your lawn mower shuts down at idle speed. It happens due to the reasons:

  • the carburetor has become out of tune or has been incorrectly adjusted;
  • the carburetor is dirty;
  • the air filter is heavily contaminated;
  • Using the wrong fuel can cause the gearbox to run low;
  • your grass trimmer may idle if the throttle is clogged;
  • air gets into the carb system;
  • the lawnmower does not get enough gas to be fully functional and will stop working after that.

We are sure that you have received as much useful information as possible and found a solution to your individual situation by means of our technical advice. Any spare parts, like brushcutter starter, its components and accessories we have at the lowest cost in the country. Hurry up!

Instructions for users

all gasoline-powered tools need a pre-run-in period before use. At this time, the moving parts are lapped to reduce resistance. As this stage takes place at low revs, it is easier for a beginner to master this equipment.

Before starting work, the mix must be prepared. Its parameters and used materials are specified in the technical documentation of the product. It looks approximately like this: Mix 2.5 liters of 95-grade gasoline with 100 grams of STIHL oil from the red packaging. This procedure should be carried out in a container resistant to corrosive fluids. A simple metal canister is not suitable because of the rusty areas that cannot be detected inside. Corrosion particles, getting into the carburetor, clog it, which leads to the failure of the part.

To run in the brushcutter for 3-4 hours and let it run idle for no more than 15 minutes. Every now and then you need a warm-up period of 20 to 30 seconds. At this time, you can put light work on the weed trimmer.

During the warranty period, the lawnmower needs maintenance and adjustment of the carburetor. Have this work done by an authorized service center.

Possible Malfunctions

Unfortunately, even the competent and careful use of high-quality gasoline lawnmowers does not completely eliminate the risk of breakdowns. Let us consider the most widespread malfunctions.

  • The engine will not start. Probably broke the spark plug or the carburetor is not getting fuel.
  • unstable operation of the engine at idle speed. One of the most common causes for this condition is improper carburetor adjustment.
  • The grass trimmer does not rotate and does not provide enough power. Such phenomena are associated with the need for cleaning or replacement of the air filter, spark plugs, as well as carburetor adjustment and removal of carbon deposits in the muffler.
  • Engine overheating, which may be caused by using a low-quality fuel mixture.

Quite often owners of gasoline-powered mowers have to deal with situations where they stall when you press the gas. The most common cause is that the carburetor is not working properly and needs adjustment. Most often it happens after a long storage of the device or as a result of its operation in difficult conditions.

When you add gas and the engine stops, the fuel valve is blocked and will need to be loosened a bit to get the gas flowing again. Often you have to deal with a clogged breather, that is, a check valve, located in the fuel tank. Among other things, the reasons that the grass trimmer engine stops, can be a slack cable in the carburetor and stretching the fuel hose.

The following video is an in-depth review and test of the STIHL FS55 lawnmower.

Why the Chinese lawnmower does not rev?

If the performed operations with the filter you have done, but the work of the grass trimmer, powered by gasoline, remained the same, gasoline trimmer does not pick up revolutions what to do?

Then you should try to remove the filter from the device in order to provide the so-called “lightening” of the grass trimmer. lawnmower does not develop speed, why the Chinese STIHL fs gasoline trimmer. Should help.

The next and quite common problem when working with a gasoline trimmer is that it just stalls, and gives no signs of life.

In this case, the problem may be as follows:

The last and most common cause of gasoline grass trimmer breakdown 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 if too much load on the gasoline grass trimmer, this small cable can crack and then you will definitely have to go to the service center, and then even throw a lot of money in the wind.

How to attach a disk or line to a trimmer

The cutter is mounted on the actuator. The attachment point is called the gearbox. The task of installing the disc or spool is not difficult. The principle of attaching the cutting blades to the trimmer is as follows:

  • Initially the washer is fitted by using the hexagon socket wrench
  • Insert the disc on the shaft
  • Then install the top washer, and then screw it on with the securing nut
  • The nut should be turned with the special box spanner that comes with each tool
  • Turn the nut in counter-clockwise direction
  • The shaft must be jammed with the hexagon socket wrench as it is rotated

Removing and replacing discs on the trimmer is done in reverse order. For more details on how to install a spool of fishing line on the lawnmower, described in this material.


In case of failure of the power tool due to normal wear and tear or defects. no claims against the tenant! You do not pay the cost of repair!

Do not open the tool, do not break the seals. the tool is removed from warranty and sent to an independent service center and they determine the cost of repair! In case of mechanical damage/soiling of the equipment. the Renter pays for the repair!

We reserve the right to refuse to rent equipment/scaffolding if: authenticity of documents is questioned, the person is under 18 years old, persons under the influence of alcohol or drugs etc.д.

Build your own House!

When buying a lawn mower, you need to be prepared for the fact that, as with all similar tools, it can also have failures that will require repair.

But do not immediately run to the service center and pay a lot of money to craftsmen who convince you that there is a severe malfunction in the device.

The lawnmower stops at high rpm on gas

Perhaps the most common complaint associated with gasoline trimmers, sounds like this: “lawnmower shuts down.

Naturally, the prerequisite for this can be a fairly severe malfunction. But in most cases, the situation is even simpler than it seems at first glance.

To cope with such a malfunction, first try, without the help of others to understand the causes, because, having found the cause, with a malfunction to fight even easier, and from time to time it is even samolikviditsya.

In fact, circumstances, this is when lawn mower it stops on high revolutions. there are many such circumstances.

Why Chinese mower does not revolve?

Grass trimmer does not pick up speed. This is a very common problem and of course does not always have a simple solution.In this.

grass trimmer does not pick up speed. what to do?

The first start of the new lawnmower.I removed the grid from the muffler, it began to work.

There is also a power system malfunction.

In that case, the lawnmower will stall at idle speed. Misalignment or improper adjustment of the carburetor can lead to problems with the power system.

Vibrations that occur during the operation of the lawnmower can lead to deregulation.

Incorrect lawn mower adjustment, on the other hand, can be corrected by simply adjusting it according to the requirements specified in the instruction manual.

Also, sometimes gasoline grass trimmers can stall because the valve located in the gas tank cap is simply clogged or stuck.

To find out, try using the mower by loosening the gas tank cap.

If the machine is working properly in this mode, clean the valve.

stihl, mower, does, lawn

Furthermore, the lawnmower may stall due to poor fuel flow to the carburetor

Why does it start then, you might ask??

The reason for this is that at first the fuel runs into the carburetor a little bit and it is enough to work at higher power.

But then it wears out and at high engine speeds the engine starts to stall.

The problem with the carburettor is that it is too tight and the housing is too tight.

stihl, mower, does, lawn

The reason that the lawnmower cuts off at high revs on gas, can also be caused by air suction.

It is a place where air can escape while the engine is heating up.

Don’t forget to check the fuel intake hose. The problem could be that it doesn’t hold up well or is cracked.

These are the main reasons why the lawnmower can stall.

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STIHL FS 55 STIHL FS55 brushcutter. universal lawnmower with AutoCut 25-2 mowing head TTX: Parts: STIHL FS55 lawnmower. Detailed Overview and TestWARNING! ? The review was filmed a year before, the video footage was lost, in the end.

What to do if the gasoline trimmer does not pick up speed ?

If you have once bought a trimmer for grass, working with gasoline, then you probably had to deal with a problem with turning on the trimmer for grass, as well as with such a problem as benzotrimmer does not pick up speed.

That is why this article is created.

So, what to do if the grass trimmer, which has been working for you for more than a year, suddenly just stops picking up speed. And the engine simply stops? In this case, you and I should consider a number of problems related to the stopping of the engine.

The engine can stall under a variety of circumstances. I’ve got a STIHL trimmer fs38 what’s the reason. it won’t pick up speed. Sometimes the cause of incorrect operation of the grass trimmer, powered by gasoline, is a clogged air filter.

Exactly the filter is one of the most important reasons why the gasoline grass trimmer can stop working.

The filter is very often debris falls into it, particles of dust get there, which also clog the filter, so it needs to be cleaned and washed every month, and maybe even more often, it all depends on what power has a gasoline trimmer for the grass, and how often do you use this device.

Gasoline trimmer (moto mower) repair carburetor does not work does not develop speed, power loss

Chinese lawnmower analog Husqvarna does not develop speed the reason was very simple (see video)

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

Then you should try removing the filter from the unit in order to provide what’s called a “lightweight” grass trimmer. Why the Chinese lawnmower does not develop speed, the reason Husqvarna. Should help.

The next and quite common problem with the gasoline trimmer is that it simply shuts down, and gives no sign of life.

In this case, the problem may be as follows:

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

So make sure it’s tightened well in advance, but not to the limit, otherwise if you put too much strain on your petrol grass trimmer, this little cord can crack and then you’ll definitely have to go to a service center, and then throw a lot of money down the drain as well.

The STIHL 180 does not provide any power, or if you let go of the throttle, it just keeps going without dropping the throttle. These problems are quite common. Let’s try to understand the causes, the consequence of which is the appearance of similar defects. Also further consider how to make a diagnosis, if the chainsaw does not pull. About.

Oleo-Mac SpeedGo head trimmer oleo-mac 753 t more details on the oleo-mac 755-master/ website ! lawnmower oleo-mac 753 tCylinder capacity (cm. cc) 40.2 Power (kW/L).с.) 1,6 / 2,2 Weight (kg) 7,9 Tube diameter (mm) 28 Gas tank capacity (l) 0,75.

When buying a lawn mower, you need to be prepared for the fact that, as in all similar tools, it can also have failures that will require repair.

But you should not run straight to the service center and pay a lot of money to craftsmen who convince you that you have a severe malfunction in the device.

When to go to the workshop

If the machine is under warranty, at the first signs of malfunction you can safely take it to a specialized workshop. Repair is free, regardless of the type of damage, if it’s not the owner’s fault. If you don’t know anything about the engine, it’s best to call a STIHL repair guy. In any case it is up to the user to decide how badly the machine is malfunctioning.

To recap. Both petrol and electric grass trimmers are built for years of reliable operation. Most of the problems described above occur because the owner does not pay enough attention to his helper. If the manufacturer’s requirements are strictly observed and regular maintenance is performed, the manual mower will work rhythmically and without interruptions.

Why doesn’t the STIHL electric brushcutters work at full throttle?

RPM problems can also occur with an electric grass trimmer. The reasons are completely different from those for fuel spikes.

You can fix the problem yourself

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

  • the line voltage is more than 10% below the required minimum for the unit
  • There was a failure in the soft start (if there is such a system);
  • A brush unit has malfunctioned;
  • The motor winding has been subjected to burning;
  • Sometimes the rotating parts get jammed.

To adjust the voltage, you should first check its power. If it does not comply with norms, it is necessary to increase it with the help of a stabilizer.

The soft starter can only be repaired by a service center.

The brushes should simply be replaced when worn. When installing new ones, it is recommended to clean all surfaces they come into contact with.

To adjust the voltage, you should first check the power.

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

Sticking of rotating parts can have various causes. To rectify the fault, the entire drive unit should be re-examined.

The latter problem can also occur in another unit of this company. secateurs STIHL, and sharpening the disc on the scissors will be the solution.

STIHL Fs 55 Grass Trimmer Doesn’t Revolve

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 causes of its failure. The most common problems are listed in the instruction manual. Knowing the reasons why the grass trimmer shuts down is a must in order to effectively repair the unit yourself.

Problems with a ride-on lawn trimmer that are caused by the machine not starting are classified in a certain way by service technicians. They stand out faults with the following nodes of the mechanism:

  • The engine where the piston and bearings can wear out or fail, the crankcase can crack;
  • fuel supply system, with possible filter clogging or carburetor problems;
  • mechanical damage to the wires, tubes, hoses;
  • The ignition chain.

To correctly identify the unit where the failure occurred, it is necessary to pay attention to the circumstances under which the grass trimmer stalls.

When the throttle is pressed

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 can be eliminated by loosening it, resulting in a normal flow of gasoline through the system.
  • Loosening and hanging of the cable in the carburetor. The fuel hose can also stretch to the point of bursting under considerable strain.
  • 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, you can recognize it by the appearance of lawnmower vibrations. When the hose is cracked or the cable is stretched. these components must be replaced.

Technical characteristics and features

A manual fuel pump makes it easy to pump fuel to the carburetor. This is especially important in situations where the mower is idle for long periods of time. Continuously adding fuel will allow you to quickly start the machine, even after a “long vacation.

The owner receives safety glasses and the mowing head together with the machine. To understand the assembly and other specific aspects, please refer to the manual on our website.

Other useful information can be found in the following document:

The STIHL FS 38’s curved brush cutter with a rounded handle draws attention. This design makes it easy to clean, even in narrow or confined spaces.

All the controls are located on a handy handle, so look carefully to see where and which switches you don’t need. During work, such a moment is very important, because the operator can not be distracted and without unnecessary regulation of the machine.

Adjusting the carburetor for the STIHL FS 38

It’s easy to do all the work; the main thing. Get ready for work in earnest. over, many owners note that you can not only adjust the carburetor, but also replace parts. The following diagrams will be a great help in this matter.

Possible causes of malfunctions in electric scythes

When operating a grass trimmer that has an electric motor, problems with gaining revolutions also happen. But they are caused by completely different faults, compared to fuel-scores. The electric motor does not develop the required rotation speed in such cases:

  • If the mains voltage is more than 10% lower than the engine rating;
  • In case of malfunction in the soft start system (if this unit is installed);
  • When there are problems with the brush assembly;

To rule out a voltage problem, you need a multimeter or tester to check its value in the outlet, from which the power is taken. If it is less than the minimum allowable value, to increase it, you need to turn off all electrical appliances or install a stabilizer.

The prerequisite for the grass trimmer to work properly is the use of an extension cord with a cross section that matches the grass trimmer’s motor capacity.

In order to repair the soft starter one should have corresponding knowledge in electronics, that’s why it is better to apply to a service center. There it is determined by its repairability or the need for replacement. You can independently check the button or find the block diagram and try to figure it out.

The brushes can wear out, resulting in loss of contact, resulting in stopping the electric motor. Brushes are easy to replace. The particularities of the process are determined by the model of brushcutter used. It is also necessary to clean all the surfaces that make contact with the brush.

In the case of burned-out windings, if you continue to mow grass or shrubs, the electric motor will quickly burn out. It will be accompanied by a smell of burning, up to melting of separate parts. The electric motor will need to be replaced.

Jamming of rotating parts is caused by various reasons. To find and fix them, you’ll need to overhaul the drive unit. There are models in which the number of revolutions is automatically adjusted depending on the load, increasing with its increase. they have idle speed is falling.

The video shows the algorithm of actions for identifying the most common reasons for the grass trimmer not gaining the required revolutions:

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There is a wide range of trimmers on the market from different manufacturers. They are characterized by common reasons why the revolutions drop. Also, every unit comes with an operating manual. It contains the necessary recommendations on the matter concerning the model to be used.

If in the process of self-troubleshooting a positive result was not achieved, it is better to seek help from the experts. It is also necessary to involve professionals in solving the problem in the absence of minimum experience and skills in such matters, so that no harm is done. The most complicated part is the engine. Only experienced craftsmen are allowed to work with it. When the mower is under warranty, the best option is to contact a service center, where they will diagnose and repair the equipment.

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