STIHL FS 55 grass trimmer carburetor adjustment

Lawn mower design

The STIHL FS 55 lawnmower is very straightforward, if you plan to operate it, let alone repair it. The internal combustion engine in this machine is almost the same as in a chainsaw. But the guide bar is attached to the engine gearbox with a long tubular bar.

A handle is fixed to the machine’s boom and can be used to move the end of the boom with work equipment. The STIHL FS 55 lawnmower, whose repair guide is in the article, has a deflector shield on the human side, which prevents operating injuries.

The tool itself is a round drum, on both sides of which a thick fishing line emerges from the holes. carburetor adjustment and chainsaw repair STIHL fs55 fs 38 carburetor lawnmower repair STIHL fs55 fs 38 carburetor.

When the drum unwinds, the line under the action of centrifugal force is stretched and strikes the grass, cutting it.

The STIHL FS 55 lawnmower, whose technical features will be presented to you below, has a wear-resistant nylon line. Features of the STIHL fs 38 brushcutter, STIHL fs 38 lawnmower carburetor adjustment. It is occasionally refreshed by unwinding the reel, which is located inside the drum.

Model description

The above-mentioned version of the equipment costs 13 490 It is a premium device. With its help it is possible to take care of the territory on a large suburban plot. Young and ancient grass, reeds and weeds, as well as young shrubbery lends itself to the equipment.

The STIHL FS 55 lawn mower, the reviews of which you can read below, has the most powerful 1 liter engine. с. The device is amazingly suitable for use in the suburban area or cottage. In one pass, you can mow grass 420 mm wide.

This device is suitable for machine lawn treatment, grass mowing and allows you to pass even along the fences, treat narrow areas and areas near the beds.

In the tank holds 0.33 liters of fuel, which is enough for uninterrupted operation for half an hour.

The STIHL FS 55, the reviews of which are very good, is powered by a two-stroke engine. Working volume is 27.2 cm3. Operating the machine is very easy with the bike handle. Easy start function at the push of a button. A fishing line and a knife are used as cutting tools.

If you still do not understand which model of the described equipment to choose, it is worth to read reviews about STIHL FS 55 chain saw. Familiarized with them, you can realize that consumers highlight a huge number of circumstances that forced them to lean towards the described model. So, for example, instead of the shoulder strap, the manufacturer added a belt to the device.

Buyers also like the bike handle, which increases ease of operation. When working, the hands are widely spaced, so the machine is easier to control. It is very maneuverable. Buyers like the fact that the handlebar and belt can be adjusted to the operator’s needs.

The tool can be easily adjusted for comfortable implementation. Controls are on the same handle. No need to reach anywhere, everything fits under the palm of your hand.

STIHL FS 55″ lawnmower, in the opinion of consumers, is comfortable in addition to the fact that it has a pair of guards, one of which is set for the blade, while the other is set for the fishing line.

The shroud for the latter is tapered at the boom.

the grass trimmer has a head that is perfectly visible and allows you to work in tight places. The flight of pebbles from under the blade will be eliminated thanks to a special cover. It helps protect the operator. With the available primer you can pump fuel into the carburetor.

Even after a long downtime, as testified by consumer reviews, the lawnmower is easy enough to start. Motor start is facilitated by a special easy start system.

Read Adjusting the pressostat of an Indesit washing machine

On a long pulling of the cord, as emphasized by home masters, now do not have to waste energy, because it will need to make 2 jerks.

STIHL FS 55 lawn trimmer does not rev, throttles, rebuild carburettor Thank you for watching

Adjusting the carburetor of grass trimmer STIHL FS 55 in the video performed to adjust the idle speed

The equipment described above should be used with special clothing and equipment. Clothing must not interfere with the work. Choose one that fits perfectly to the body. Avoid wide sleeves which could snag on bushes, wood or moving parts of the machine.

Ties and shawls must be removed as a matter of principle. This also applies to decorations. Before starting the STIHL FS 55 lawnmower you should wear safety boots with rough soles. Also a hard hat and glasses must be worn as a basic protective measure in order to prevent eye injuries.

Starting the engine

The engine is started at a distance of 3 m or more from the place where the unit was filled with fuel. You can not perform these works in an enclosed space. Do not wear tie ties and shawls and take up a firm, secure footing. Always hold the machine firmly in place. The cutting attachment must not touch the ground or any object because it can be twisted when starting.

Only one person is allowed to operate the unit and no bystanders are allowed within a radius of 15 m. If this does not happen, there is a danger of injury from thrown objects.

The STIHL FS 55 lawnmower, the characteristics of which are shown in the article, must not be started by hand. The cutting attachment continues to coast for a short time after the throttle trigger is released.

Keep flammable materials away from the hot gas stream and away from the hot muffler surface, because it can cause a fire.

Fueling

The lawnmower works with petrol that simply ignites. For this reason, do not smoke while refueling. The engine is switched off before refueling. You should not perform such manipulation before the engine has cooled down, because the fuel can overflow and start to pose a fire hazard.

Take extra care when opening the fuel filler cap. excessive pressure can cause fuel to splash out.

STIHL FS 55 lawn mower, the user manual for which should be read before use, fill up in well ventilated places.

If fuel has been spilled, the device should be cleaned from it immediately so that it does not fall on the clothes, if not the latter should be changed immediately.

The fuel tank thread lock should be tightened after refueling. This helps reduce the possibility of the lawnmower being ripped off by engine vibrations. Not anticipating, there is a risk of fuel leakage.

The price of a STIHL fs 38 mower. The carburetor is not properly adjusted. It is important to pay attention to leaks.

If the fuel turned out to be spilled, then the engine should not be started, in an unpleasant case there may be a danger of burns.

The STIHL FS 55 lawnmower, the manual included with the machine, is high-tech equipment and not difficult to operate. You can repair and adjust without help from others. For the carburetor, it takes five minutes.

The carburettor malfunctions are mainly caused by breakdowns and blockages. To find the cause, unscrew the fuel filter cap and remove the strainer. If there is a build up of dirt on it, blowing or flushing in gasoline will help. If you find a visible configuration on the filter, it should be replaced with a new one.

There may also be damage to the fuel supply pipe. The failure of the carburetor starter can be due to the gap. Use gasoline or acetone for flushing. The carburetor can be blown out with compressed air, for this you can use the comfortable repair practice.

If you encounter the aforementioned discrepancy, you can verify it with a soapy solution, which is applied to the appropriate area.

The last one adjusts the fuel mixture for the low revs. For you need to find the highest rpm at idle. To do this, turn the right screw to both sides. To adjust, turn the screw counterclockwise by a quarter turn.

When adjusting the STIHL FS 55 lawnmower you need to use the bottom screw for the motor adjustment as well. If you turn it clockwise, you can achieve more.

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Proper idle speed adjustment is characterized by the normal rpm of a hot motor, the steady operation of a cool motor, and a large RPM allowance for the trimmer head.

The engine is still running smoothly even when moving from one position to the next.

The STIHL FS 55 lawnmower carburettor adjustment has a left hand screw. It controls the fuel-air mix at high engine speeds. This screw should be the last to be engaged, because it determines the adjustment of the maximum speed, gasoline consumption and temperature, as well as the engine power.

Design of the lawnmower

The device lawn mower STIHL FS 55 you should know if you plan to operate the equipment, and even more so to carry out its repair. The internal combustion engine in this machine is almost the same as in a chainsaw. But the bar of the latter is secured to the engine gear with a long tubular bar. On the inside, there is a shaft that transmits the torque from the motor to the working tool. This design is suspended on a strap that is slung over your shoulder. This allows the tool to hold its weight, which is important with the sensitive weight of the chainsaw.

There’s a handle attached to the shaft so you can move the end of the shaft with the working tool. STIHL FS 55 lawnmower, whose repair manual is presented in the article, has a protective shield on the human side in the form of a guard, which eliminates injury during operation. The tool itself is a round drum, on both sides of which a thick fishing line comes out of the holes. As the drum unwinds, the line is pulled taut by the centrifugal force and hits the grass, cutting it.

The STIHL FS 55, shown below, has a nylon blade that wears quickly and easily. It is periodically renewed by uncoiling the spool, which is located inside the drum.

How to set the ignition on a trimmer

It’s not unusual for petrol mower owners to have trouble with the ignition. In most cases, the problem is really in this node. To fix it, you need to adjust the ignition on the trimmer. But at the same time, it is not uncommon that the ignition coil is correct, and the breakdown must be sought elsewhere. The ignition system is arranged similarly on four-stroke and two-stroke internal combustion engines, so the correction of malfunctions of this node is performed in a similar way. In addition, the equipment of different brands has almost the same design of this most important component of the tool, which means. the adjustment process will be identical for trimmers “Union” or “Prorab”, as well as for Huter or samples of other brands.

Ignition on the trimmer. the principle of operation and possible malfunctions

If the owner of a lawnmower wants to adjust the work of the ignition system himself, he should understand the principle of operation of this node. In an internal combustion engine, it consists of a flywheel and magneto (coil). The flywheel, in turn, includes an impeller that acts as motor cooling and a number of permanent magnets.

Functional principle

When the flywheel rotates, an electric current is generated in the magneto, creating a spark on the spark plug the moment the magnets pass under the coil.

Typical faults

Before you start adjusting the grass trimmer’s ignition, you need to cut off other probable causes of failure and make sure that the problem is really in this assembly. To do this it is necessary to carry out a number of actions in this sequence:

• Inspect the ignition coil housing for damage and defects;
• make sure that there is no contamination on all nodes and elements that conduct current;
• check the integrity and insulation of the wiring, the contacts, the strength of attachment, the presence of rust on the joints;
• inspect the spark plug cap, since it is regularly torn from the high-voltage wire, and it is tried to be repaired by hand, and any unreliable connection reduces the power of the spark plug electrical arc;
• Check the spark plug, as the quality of modern gasoline very quickly puts this part out of order, but there is another possible problem. the spark plug is wet;
• make sure that the circuit breaker works.

Having eliminated all possible malfunctions, you can move on to adjusting the ignition coil.

When adjustment is needed

Adjust the ignition system so that the fuel ignites in the combustion chamber at the right time.

Important! When the piston compresses the fuel and nearly reaches the top dead center, a spark occurs in the spark plug. Next, when it passes the maximum upper point, the fuel ignites, an explosion generates energy and guides the piston down.

If the flywheel is shifted on the shaft relative to its original position, the fuel ignites faster than the piston crosses the top dead center. If the flywheel is shifted from its original position, the combustion engine will ignite sooner than the top dead center. Determine early fuel ignition by a broken starter cord, broken starter assembly, or other breakdowns.

Stihl fs55 carburetor adjustment trimmer weedeater gas trimmer tune up

Sometimes the ignition is too late. The piston compresses the unignited fuel and then moves downwards, before a spark is formed. As a result, the engine either does not run or its power is reduced and revs are gained much slower.

Usually the flywheel with magnets is set in the ideal position, exactly coordinated with the work of the piston, and is carefully fixed to avoid misalignment. This makes it clear that it is not possible to set the part incorrectly. But if flywheel displacement is a proven fact, it is a failure or an accident. Thus, setting the ignition timing is not necessary, since problems with early or late ignition of the fuel are very rare.

Important! Adjustment of the ignition system is very simple. It is not necessary to calculate the ignition timing. The maximum that would need to be done is to correctly align the clearance between the flywheel and the coil.

Diagnose the magneto

Magneto. a key component in the ignition systems of engines. It is a coil with a core that surrounds the primary winding and then the secondary winding. If this part is defective, there is no spark on the spark plug, and the fuel does not ignite.

First method

Check the correct functioning of the magneto by using a tester. To do this, follow this sequence of steps.

• Correctly set up the tester: use the function of resistance measurement and set 200 ohms to take measurements of the primary winding.
• Direct the first electrode of the measuring device to the “mass” of the magneto and the second one to the output contact. If the primary winding is intact, the readings should be between 0.4 and 2 ohms.
• Set the tester switch to 20 Kohm to diagnose the secondary winding. Then place the first probe on the spark plug cap and the second probe on the same ground. If all is well, the figures will range from 4 to 6 Com, depending on the model of grass trimmer, whether “Patriot 547”, Husquarna 128 r or other brand of equipment. If the circuit is open, the tester will show infinity value. If there is a short circuit, the display will show zero.

The second way

If there is no possibility to use the tester, there is another way of testing. It is important not to touch the cylinder with the electrode, otherwise the coil will be damaged.

• The cap should be removed from the spark plug. Do not unscrew the spark plug, as this will save compression.
• Then find a nail with the head removed and insert it firmly into the cap.
• Next, the cap with the nail should be firmly attached to the cylinder with dielectric. In this case, the electrode should be at a distance of 5.5-7 mm from the cylinder body, but it should not touch the mass.
• Then use the starter to simulate the engine starting with the ignition button turned on. In doing so, you need to carefully observe whether the spark appears, and try to determine its color.

Important! A solid white or blue spark indicates that the magneto is in good working order. If it is weak, and also orange or yellow in color. the magneto is damaged.

There is one important point to consider when diagnosing: unheated magneto in any state can form a powerful spark. However, if it is defective, then, having warmed up, it stops creating current, and the grass trimmer does not start. Later, after cooling down, the coil returns to the operating level, the single axle tractor turns on and runs idle or under load for a while until the magneto temperature rises again. In this case the part should be replaced with a new one.

For your information! In a number of situations, the heating problem is not the fault of the coil, but of the spark plug. This means that both parts need to be checked.

The procedure for adjusting the ignition

Adjusting the ignition system is simple and identical on different models of trimmers, whether STIHL FS55, AL-KO BC 4125 or another lawnmower. First remove the casing from the engine by first unscrewing the fasteners securing it. This disassembly step may vary between different brushcutter models (described below). Next, you need a screwdriver to partially unscrew the fasteners that fix the magneto, and turn the flywheel so that the magnets are in the upper part.

In order to make the optimum gap between the coil and the magnetos, it is necessary to use a special template. It is not practical to buy it for a single use, but you may alternatively use a business card or small calendar, or a sheet of A4 paper folded in half. Also suitable is a strip cut from a plastic bottle or other improvised materials that have the necessary thickness. The optimum distance is normally found in the owner’s manual. Place a suitable object between the magnets and the coil.

Then the spool will be attracted to the handwheel by the magnetic field. Holding the magneto in this position, you need to tighten the fastener that fixes it, and then pull out the card. After that, you need to crank the flywheel a few times to make sure that it is not hitting the coil at all. The process is over. the ignition on the brushcutter is aligned. You can learn more about the adjustment process of the trimmer ignition system on the Internet, where many videos on the subject are available.

Peculiarities of adjustment on different models of trimmers

The ignition system is arranged in a similar way on the technique of different brands, so the process of its adjustment will look the same. The differences, if any, are insignificant. They are mainly associated with disassembly of equipment. For example, the removal of the cover from the engine on different trimmers is performed with some differences. For example, on Patriot machines you first need to unscrew the bolts and disconnect the air filter housing with a slotted screwdriver. The plastic housing is then easily removable. A detailed diagram and design of the grass trimmer for a particular model is usually shown in the instruction manual of the tool.

So, to carry out the adjustment of ignition for gasoline grass trimmer can be your own hands. This process is not difficult, if you know the correct procedure. But beforehand, you need to exclude probable failures of other nodes and parts, for example, spark plugs or magneto, which can be the reason for the lack of starting the brushcutter engine. But when you take apart different brands of machines, you have to take into account the likely differences in design, which are described in detail in the owner’s manual.

How to lubricate the gearbox of grass trimmer / gearbox of lawnmower / gearbox of brushcutter

You should lubricate the gearbox of your grass trimmer at least once a year, but it is better to check the lubrication after every 20-25 hours of operation or when the gearwheels in the gearbox of your brushcutter. How to Grease a Lawnmower Gear. To lubricate, you first need to clean the plug itself and the area around the plug of soil and grass residue, so they do not get inside the gearbox when filling it with grease. Then you have to unscrew the plug for the lubrication of the gearbox (e.g. ECHO lawnmower has 17 mm spanner, Husqvarna has 6×5 mm spanner, Chinese lawnmower has 12 mm spanner). Lubricant is better to use the same manufacturer as your trimmer for grass, or just from world-renowned brands such as Oleo-Mac, STIHL, Husqvarna, Oregon, LiquiMoly, Lithol-24, Azmol 158, etc.д., as long as it is not counterfeit! If it is new, unseal the tube by removing the cap with your fingers or by punching a bridge in the tube’s spout with the back of the cap. Then we put the weed trimmer on its left side and turn the blade with one hand (so that the gear wheels will spread the grease and the whole volume will be filled). With the other hand we pour the grease slowly from the tube through the hole inside the gear housing until it is filled. Then we screw and tighten the screw plug of the grass trimmer gearbox and the plug of the tube with grease. If the grease is not in a tube (but, for example, in a can), take a syringe without a needle, take out the piston, fill the syringe with grease (you can use your finger), and then fill the grass trimmer gearbox with grease from the syringe.

Removing the handle

To disassemble the STIHL 180 straightforwardly start by removing the handle which is fixed to the STIHL 180 chain saw body with three rubber buffers. To remove the plastic plugs from the inside cavity of the shock absorber, and then, using a strong screwdriver, first squeeze the upper shock absorber, then the one closest to the rear handle.

The throttle trigger is located at the rear of the handle and is connected to the carburetor by a wire tie. To disconnect the cable from the throttle trigger you must loosen two screws and disassemble the handle.

When the handle remains on one shock absorber, it is necessary to unscrew the body of the chainsaw from the inside of the handle and, breaking aside, remove the body from the last rubber.

Possible breakdowns

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

• The engine will not start. The spark plug may be broken or the carburettor may be out of fuel.
• Unstable work of the internal combustion engine at idle speed. One of the most common causes of such situations is the improper adjustment of the carburetor.
• Grass trimmer does not rev up and does not deliver enough power. Clean or replace the air filter, spark plug, adjust the carburetor and remove muffler deposits.
• Engine overheating that may be caused by a low-quality fuel mixture.

It’s not uncommon for petrol mower owners to have to deal with situations where they choke when they step on the gas. The most common cause in this case is a malfunctioning carburetor that requires adjustment. The problem is most often caused by long storage or by operating the machine in extreme conditions.

Stopping the engine when adding gas can be caused by a clogged fuel valve, which will need to be loosened slightly to resume a normal supply of gasoline. It is not uncommon to encounter a clogged breather, that is, a check valve located in the fuel tank. Among other things, the reasons why the grass trimmer engine stalls can be a slack cable in the carburetor and stretching of the fuel hose.

The following video gives you an in-depth illustration of the STIHL FS55 mower.

Features and Best Models

Special mention should be made of the “STIHL” mower, which is multifunctional, reliable and easy to use. Specialists have developed many varieties of scythes, with different characteristics and applications.

For example, the lawnmower range is designed for mowing grass over large areas. For this purpose, a self-propelled wheel system was developed, making it possible to mow large areas without spending a lot of time and effort. For decorating bushes, giving them a certain artistic image and texture, perfectly suits the lawnmower. And if you need a lawn mower for tall grass and uneven areas, follow this link for a complete selection of this type of equipment.

If you need a more delicate approach to cleaning the grass, for example near flower beds or between trees, then the gasoline grass trimmer will perfectly cope with this task, designed for accuracy and precision performance. The company’s specialists have taken into account all the nuances and possible difficulties when working with mowers, so they equipped them with nylon strings that prevent mechanical damage to trees.

There is also a special trimmer head AutoCut, which ensures normal functionality of the string blades of the petrol trimmer. About the of petrol hand lawn trimmers trimmers for grass will tell you this article, as well it will help you make the right purchase, which you will not regret.

There are two types of these mowers: amateur and professional models, designed for tasks of particular complexity. The first category includes models FS 38, FS 45, FS 55 and others. Features and differences of these tools are in the power of the motor (from 0.9 to 1.2 liters).с. depending on equipment) and tank volume (approximately 0.34 l).

The professional models include STIHL FS 130 and FS 250 grass trimmers. Let’s consider characteristics and features of several mowers, in particular FS 38, FS 70 and FS 130.

Take a look at the machine features in the video.

Gasoline mower FS 38

The model is characterized primarily by its simplicity and compactness, which is enough for the proper care of the yard. The main control keys are located on the handle of the device, which greatly facilitates and speeds up the work.

Price of STIHL FS 38 mower is about 130.

• engine power. 0,9 l.с;
• engine capacity is 27.2 cm3;
• tank volume. 0.33 liters;
• The engine type. two-stroke;
• boom. straight;
• D-shaped handle;
• equipment. 2-toothed trimmer blade for grass, goggles for protection, belt;
• weight. 4.1 kg.

This model is one of the most popular on the market! Read about all the machines rated as the best lawn mowers here.

It is a more advanced model, featuring higher power and multitasking. Anti-vibration system that allows to significantly reduce the impact of running engine on the handle.

New generation engine reduces fuel consumption. The cost of this model varies, but the average price is around 300.

• engine power. 1,2 l.с;
• engine displacement. 27.2 cm3;
• tank volume. 0,34 l
• engine type. two-stroke;
• rod. straight;
• handle. T-shaped;
• equipment. belt, spool with a fishing line;
• line diameter. 2.4 mm;
• weight. 5,4 kg.

FS 130

The model belongs to the professional models, so the goals for it will be a little higher. It is designed for mowing coarse grass, harvesting tough shrubs and young trees.

It is equipped with the latest motor of high power, which does not emit too many harmful emissions.

Price for STIHL FS 130 mower is about 400.

• engine power. 1,9 l.с;
• engine displacement. 36.3 cc;
• tank volume. 0.53 l;
• boom. straight;
• handle. T-shaped;
• equipment. shoulder strap, double blade knife;
• line diameter. 2,4 mm;
• weight. 5,9 kg.

The variation in price of these models does not indicate any difference in quality, above all, each STIHL mower is designed for a particular type of work.

It is quite clear that there is no point in buying a more expensive and powerful model if you have a small area or a front lawn. The simpler models will cope with this task perfectly, but the word “simple” is not used here in a derogatory way. The more powerful mowers are designed for larger areas of overgrown and dense terrain, hence the price difference. And if you’re at a loss when it comes to choosing your lawn mower, then don’t be sad, but take a look here and we’ll show you how to choose.

However, what model you would not choose, you need to follow certain rules of operation, recommended by the manufacturer, in order to avoid possible breakdowns.

The Preparatory Phase

Repair of any machine should start with preparatory work and the STIHL 180 is no exception. Before you begin disassembling your STIHL 180 chain saw, first remove the side cover, the chain and the guide bar from the chain saw. Next, using a compressor and a brush, you need to clean the chain saw from dirt, sawdust, oil stains, etc.

When cleaning the saw, special attention should be paid to the place where the chain saw’s drive sprocket is located, t. к. This is the dirtiest area.

In places where there is a large accumulation of oil, you can wash with clean gasoline.