STIHL 55 lawnmower just won’t pick up speed. How to adjust the carburetor on a chain saw

STIHL Fs 55 Grass Trimmer Doesn’t Revolve

grass mower, which has a gasoline drive. it 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. Know the reasons why the grass trimmer stalls should be known in order to effectively repair the unit yourself.

Problems with the chain saw associated with the fact that this device does not start are classified in a certain way by service technicians. They stand out faults with the following parts of the mechanism:

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

In order to correctly identify the unit where the failure occurred, you must pay attention to the circumstances under which the grass trimmer stalls.

When pressing on the gas

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

• The most common variant is the failure of the carburetor adjustment, which occurs when there are significant loads on the drive, after prolonged inactivity of the mechanism or when using it in harsh conditions.
• A clogged fuel valve, which can be repaired by loosening it and making the gasoline flow through the system normally.
• Loose and hanging cable in the carburetor. The fuel hose can also become stretched or even burst if subjected to considerable force.
• The breather valve is clogged, and that is why there is no fuel in the tank.

If the problem is in the carburettor unit, you can recognize it by the vibrations of the lawnmower. When the hose bursts or the cable is stretched out, these components have to be replaced.

Major carburetor problems and malfunctions.

Strainer. There are two problems with this element most often:

In order to find out the cause of the failure unscrew the fuel filter cover to remove the strainer. If it is just clogged with mud, flushing or blowing out would help.

If the strainer is visibly damaged, it is imperative that a new strainer be fitted. There may also be damage to the fuel supply pipe (when repairing the practice of checking this element).

The starting device of the carburetor in most cases does not work because of clogs. Use acetone or the same gasoline for flushing.

Blowing out parts of a clogged carburetor with compressed air is an acceptable and comfortable repair practice.

throttle body, carburetor parts linkages, inlet or outlet pipe. all these parts are subject to depressurization. You can probably check it by a simple method. spread soapy foam on the problem area.

Lawnmower carburetor device

The carburetor base of the lawnmower is a duralumin housing. It contains a diffuser (hole with internal circuits). Blowing air through this hole. Oxygen (air) flow rate depends on the diffuser cross-section (orifice).

The diffuser is equipped with fuel channels. How to adjust the carburetor on a brushcutter carburetor adjustment in practice. video. Fuel is drawn from them with the help of the air flow.

Lawnmower carburettor design

Lawnmower carburetor base. duralumin body. It contains a diffuser (orifice with internal circuits). The air is pumped through this port. On the section (passage opening) of the diffuser depends speed of oxygen (air).

Fuel ducts in the diffuser. How to adjust the carburetor on a lawn mower carburetor adjustment in practice. video. Fuel is sucked out of them with the help of the air flow.

Adjusting the carburettor on the STIHL FS 55 lawnmower

STIHL lawnmower carburetor adjustment

FS 55 Parts Shop Sadservice.com.ua.

Fuel is sucked into the carburetor system by a pump (its diaphragm). Sowers carburetor Then flows through the nozzle in the carburetor. Then the liquid flows through the inlet and outlet valves of the pump. Fuel is filtered through the wire mesh. The needle valve moves into the diaphragm chamber.

• Supply of air into tube with air baffle (flap). The baffle plate controls the intensity of the air flow.
• The fuel system is inevitably narrowed by a mixer to speed up the flow.
• Gasoline flows through the float box and restrictor nozzle. The chamber with a float regulates the temporary volume of petrol. In the float chamber the pressure level is neutral, but in the tube with constriction the pressure level is already low. Differential pressure causes fuel to seep through the nozzle.
• Acceleration of airflow promotes fuel (gasoline) transfer and atomization. Eventually an air-fuel mixture of right proportion or density appears.
• The air-fuel mixture enters the cylinder through the fuel pipe.

READ STIHL 250 Carburetor adjustment video

The area of the open air damper depends on the level of air density in the system. The wider the flap is open, the higher the fuel consumption and power.

Simply speaking, the adjustment of the carburetor on the gasoline mower is to create a good fuel consistency through the correct air supply.

How to mow grass with a gasoline mower and a trimmer

With the advent of spring vegetation appears on dacha plots and private homestead territories, which must be dealt with. If it is decorative vegetation, it should be mowed with a lawnmower, and for mowing weeds and large thickets, lawnmowers and grass trimmers are used. These are prototypical manual mowers, the use of which requires some skill. Not many specialists know how to mow with a gasoline mower according to the instructions. If you ask yourself this question, it’s time to know how to mow.

The first steps on how to start a STIHL brushcutter:

• Before you start using your petrol grass trimmer it’s a good idea to read the manual and check your STIHL grass trimmer for every part.After that you can assemble it.
• An important step is the fuel preparation and filling. Prepare mixture in measuring cup. It is filled with gasoline and oil in the specified ratio. Using a funnel, the mixture is poured into the fuel tank.
• On the first start, turn the ignition on without opening the choke. You should put the device on a flat and smooth surface for stability. Now. pull the cord sharply 3 to 5 times. The choke can be opened either way: whether the engine starts or not.

For the first start it may take up to 15 pulls. After starting the engine, let it idle for a few seconds to warm up. Stop the lawnmower after a short while with the stop button.

These instructions are universal, because in order to start a STIHL lawnmower, you need to follow the same steps.

In the case of starting an electric trimmer for grass, everything is much easier: you need to read the instructions and act in accordance with it. Instead of fuel, there is electricity. The device works from the mains, so it is important to provide enough power, so that the grass trimmer was able to gain revolutions.

After each use, both gasoline and electric trimmers need a thorough inspection.

Following the instructions, you can quickly fix any small breakdown on your own. But sometimes it is not possible to start the machine with your own hands. In this case, it is better to seek professional help, especially if it relates to the problem with the engine and the development of revolutions in the grass trimmer or lawnmower.

If you have once purchased a trimmer for grass, working with gasoline, then you probably had to deal with the problem of turning on the trimmer for grass, as well as with such a problem, as a gasoline trimmer does not gain momentum.

That is why this article is created.

What do you do if you have had your grass trimmer for years and it just stops revving and the engine just stops working?? In this case, you and I should consider a number of problems associated with stopping the motor.

The motor may stall under various circumstances. Sometimes the cause of incorrect operation of the gasoline-powered grass trimmer is a clogged air filter.

It is the filter that is one of the most important reasons why a gasoline grass trimmer can stop working

It often gets a different debris, particles of dust 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 has a gasoline grass trimmer, as well as how often you use this device.

Which mowing head to use with a chain saw

There are two types of cutting attachments or cutters used in the construction of a chainsaw. These are spools with a fishing line, as well as steel or plastic discs. What is the best choice for working with a gasoline tool. Here you can find information on how to choose trimmer blades and lines for trimmers, as well as their types and design features. Let’s take a brief look at what types of cutting blades should be used on trimmers and chain saws.

For mowing soft grass, a line is used for trimmer, which is wound on a drum or spool. line for trimmers, unlike metal discs, is used where grass grows next to trees, houses, fences, and other obstacles. trimmer line allows you to mow grass near obstacles without damaging the tool

Choice of cutting blade depends on where you use the tool. If it is planned to work in the homestead area, then the line for the trimmer is selected, and for mowing grass in the field or steppe, discs with 3-4 blades and more are used, as well as discs with small cogs.

This is interesting! In most cases the cutters are not completed with a tool, so the buyer can independently decide what he needs. a line for the trimmer or a steel disc.

hedge trimmers

Extremely powerful machines with innovative 2.2L engines.с 3,8 л.с. are used for professional forest clearing, thinning out woodland, municipal services, parks and landscaping. The clearing saws work efficiently and reliably for long periods without sacrificing quality.

STIHL brushcutters use a variety of cutting attachments as mowing attachments: young and thicket knives, chisel blades. STIHL chain saw blades in steel can cut through trees up to 7 cm thick.

Some versions (designation FR) have a backpack engine with a special shaft for power transmission. STIHL ride-on mowers marked FS.

The powerful STIHL FS 490 C-EM, FS 510 C-EM and FS 560 C-EM brushcutters have an M-Tronic electronic engine management system which automatically regulates the fuel mixture and ignition timing. The STIHL 2-MIX engine technology makes them very economical and environmentally friendly.

STIHL FS55 lawnmower carburetor repair

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

If objectively analyzing reviews of STIHL and Husqvarna lawnmowers owners on different forums, it can be concluded in general that these models are approximately at the same technical level in terms of reliability. But if you compare lawnmowers for safety, convenience, some consumers prefer the brand Husqvarna.

The Husqvarna brushcutter’s shield is larger and the engine is fully enclosed in plastic, so the machine starts more smoothly and picks up speed more easily. All components are easy and fast to repair.

STIHL starts worse, it has a sharper sound, the plastic color gets dirty. STIHL chain saws, on the other hand, have maintenance-free gearboxes that do not require additional lubrication. And it is absolutely necessary to lubricate the Husqvarna mower, to ensure a longer life. STIHL piston group can withstand a low-quality fuel mixture without failing.

A big plus of STIHL trimmers is the ergonomic vibration-absorbing pads that you can work with long time without feeling uncomfortable. STIHL mowers have 20% lower fuel consumption and 70% fewer emissions. Note that the ignition is always on, Husqvarna, in fact, a serious disadvantage, based on safety technology.

STIHL chain saws are priced much lower than Husqvarna mowers. Nevertheless, the models of both brands are in high demand, so they have a right to exist. And what choice the consumer will make will depend more on personal preferences than on specific technical characteristics.

STIHL FS 55 VS Husqvarna 128R chain saw comparison

Where to start with diagnosing your brushcutter

If the lawnmower does not start or immediately stops after starting, you need to check all major components and units one by one. To check the mix it is necessary to mix the fuel-oil mix strictly according to the instructions:

• Fuel tank (fuel quality);
• Candle and spark plug conduit;
• Air filter;
• Fuel filter;
• The breather plug;
• Exhaust port.

These assemblies are most often the source of major problems that can be fixed after a thorough inspection.

Checking the fuel mixture

Before starting the engine of a gasoline grass mower, check the availability, and the quality of the fuel mixture. Don’t be thrifty, greedy or “smart” about it. Repair or replacement of the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). Check the fuel-oil mix in accordance with the instructions. Calculate your lawnmower‘s capacity based on your actual needs. Over time, residual gasoline from the work cycle tends to lose its properties.

Carry out diagnostics of a spark plug and a spark plug channel

If the quality of the fuel mixture is the same but the lawnmower does not start, it could be due to a faulty spark plug. A simple spark plug wrench (every motorist should have one) and a spare spark plug will do for repair.

• We unscrew and wipe the spark plug;
• Thoroughly dry it (do not burn it);
• We drain the excess fuel in the chamber through the spark plug hole and dry it;
• Clean the old spark plug from soot with a file or a lady’s file;
• We expose a gap with a distance of 1 mm (you can check it with any coin);
• Put everything back in place and try to start the weed trimmer.

Dry the channel not less than 30-40 minutes. Otherwise there is a risk to re-fill and a new spark plug.

If the spark plug works, the socket where it is located is completely dry and the lawnmower does not want to start, lubricate the threaded joints with petrol. It should be slightly moistened. No matter how great a spark the spark plug gives out, there is simply nothing to ignite in the dry chamber.

If the engine trimmer for grass still does not start, you should rule out such a cause as a lack of spark due to poor contact between the plugs and the high-voltage wire. If the connection is good, but there is still no spark, you most likely have a “broken” ignition unit. You can not do without a master here, t. к. the part is not repairable, but is sold as a complete unit.

Lawnmower filter diagnostics

Another reason why a gasoline-powered grasshopper chokes can be the air filter. To rule it out, try removing the filter and starting your grass trimmer without it. If you can, you will have to replace the air filter with a new one, or at least blow out and thoroughly clean the old one.

The gasoline grass trimmer may fail to start due to a dirty fuel filter. This is the next step of our algorithm. Here we check the condition of the filter element and, if necessary, replace it with a new one. When replacing, try not to leave the suction pipe completely without filter, it is forbidden by any operating instructions. Haste may cause the engine piston group to be repaired.

Breather and exhaust port

Often “delicate” brand name chain saw models will not start and shut down because the breather plug is dirty. The main function of this element is to equalize pressure in the gas tank. If the node is clogged, a vacuum is created in the tank, preventing fuel flow. You can eliminate the fault by cleaning the breather plug. You can use an ordinary needle for cleaning.

Normal operation of a combustion engine can be impaired if dirt gets into the exhaust port or the silencer mesh is clogged. This problem is encountered on older models. A simple cleaning and removal of the spark plug mesh would solve the problem.

complex causes of lawn mower failure

If the step-by-step troubleshooting algorithm did not produce a result, and your grasshopper still does not start or stops, it is worth inspecting the carburetor and the engine itself. Clogged carburetor can be one of the causes, unstable operation of the tool. Three main problems can be identified here:

• Clogged passages or nozzles. All this is cleaned with special washes or blown with a powerful jet of compressed air from a compressor. Do not use needles and wire, as the passages may be damaged;
• The carburetor seal is worn. The way out is to replace the failed gasket;
• Leaks in the air filter. To check this indicator, you can use an ordinary household tonometer, replacing the pressure gauge on it with a suitable. Watch the readings: if they do not change. everything is fine, and if the pressure starts to fall, it means that some part of the carburetor is defective. You will have to find it and replace it with a new one.

If everything is okay with the carburetor, the gasoline grass trimmer may not start due to wear of the piston group. If you find chips, scratches or scrapes on the piston or cylinder, they should be replaced. Piston rings must be checked. A slight play of the piston when rocking the crank rod is an indication that it is time to change the rings. This procedure is best left to the professionals of the service center.

When to call a workshop

If your power tool is under warranty, you may take it to a specialized garage at the first sign of malfunction. Repairs are free of charge regardless of the type of damage and if the damage is not the fault of the owner. At breakage in the engine to the person uninitiated in technics, it is better to address at once to the expert. In any case, the degree of seriousness of problems with the machine is determined by the user himself.

To sum up. Both gasoline and electric grass trimmers are designed for many years of reliable operation. Most of the problems described above are caused by lack of attention from the owner to his helper. With strict adherence to the manufacturer’s specifications and regular maintenance, the hand-held mower will operate rhythmically and without interruptions.

Why doesn’t the STIHL electric grass trimmer give full power?

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

You can rectify the problem yourself

the electric weed trimmer doesn’t develop the power it needs, because

• the voltage in the mains is lower than the required minimum for the device by more than 10%;
• There was a failure in the soft start (if there is such a system);
• There is a problem with the brush unit;
• the motor winding has become fried;
• Rotating parts sometimes get jammed.

If you want to adjust the voltage, you must first check its power. If it is not up to standard, it must be increased with a regulator.

The softstarter can only be repaired in a service center.

If the brushes are worn out just change them. If new ones are installed, it is advisable to clean all surfaces with which they come into contact.

To adjust the voltage, it is worth checking the power first.

If the motor windings burn out, the electric motor has to be changed.

Jamming of the rotating parts can be caused by many things. To get rid of them, the entire drive unit must be reviewed.

This last problem is also common with other STIHL pruning shears and the sharpening of the blade can be the solution.

When to call a workshop

If the machine is under warranty, at the first signs of incorrect operation you can safely take it to a specialized repair shop. Repair is free, regardless of the nature of the damage, if it is not the owner’s fault. If there is a problem with the engine, the next best thing to turn to an expert. In any case, the severity of malfunctions with the machine is determined by the user himself.

To sum up. Both gasoline and electric grass trimmers are built for years of reliable use. Most of the problems described above are caused by lack of attention to your helper. If the manufacturer’s requirements are strictly followed and regular maintenance is performed, the manual mower will work rhythmically and without interruptions.

Why a STIHL electric grasshopper does not develop its full performance

When using an electric trimmer for grass, problems with revolutions can also occur. The reasons here are completely different from those for fuel-powered mowers.

You can fix it yourself

trimmer elektrichesky for grass does not develop the required power, because:

• The mains voltage is lower than the required minimum for the unit by more than 10%;
• If the system has worn out, the brushes should simply be replaced;
• There was a malfunction of the brush assembly;
• The motor winding has become fried;
• rotating parts sometimes get jammed.

To adjust the voltage, you should first check its power. If it does not meet the norms, you should increase it with a stabilizer.

Repair of the soft starter system is carried out only in the service center.

If the brushes are worn out, they must simply be replaced. If new ones are installed, it is advisable to clean all surfaces with which they are in contact.

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

If the motor windings are burnt out, the electric motor must be replaced.

Sticking of the rotating parts can occur due to various reasons. To eliminate this problem you need to overhaul the entire drive unit.

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