STIHL fs 55 – Change fuel filter

How to Adjust the STIHL Fs 55 Lawn Mower’s Carburetor

stihl, change, fuel, filter

Everyone who has ever mowed the grass knows what advantages the use of mechanized devices gives. One of these devices are gasoline mowers, which are in a large range of specialized retailers. Among them, there are several models that are particularly attractive both in terms of price and characteristics. A similar feature is the STIHL fs 55 grass trimmer.

How to adjust the carburettor on a STIHL brushcutter

Lawn mowers, like all power tools for the garden, are low-maintenance machines. Fixing, tuning without the help of others is possible and necessary. For example, the adjustment of the lawnmower carburetor with their own hands. a matter of 5 minutes.

The lawn mower carburetor is a component in the fuel system. It, like all carburetors, is the process of mixing air and fuel (gasoline) for the upcoming delivery to the engine cylinders.

In this process, the main thing. the correct proportion of fuel and air, and adjust the carburetor.

The main problems and malfunctions of the carburetor.

Strainer. There are two difficulties with this element more often than not:

In order to find out the cause of the breakdown unscrew the fuel filter cover to remove the strainer. If it just piled up dirt, it will help flush in gasoline or purge.

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

The carburetor starter kit malfunctions most of the time because of clogs. You should use acetone or the same gasoline for flushing.

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

throttle body, carburettor parts linkages, carburettor inlet or outlet pipe. all these parts are subject to depressurization. It is possible to check probably by simple method. to smear problem area with soap foam.

Lawnmower carburetor construction

The carburettor base of the lawnmower carburettor is the duralumin housing. It contains a diffuser (orifice with internal circuits). The air is forced in through the port. The oxygen (air) flow rate depends on the section (orifice) of the diffuser.

Fuel ducts in the diffuser. How to adjust the carburetor on the brushcutter carburetor adjustment in practice. video. Fuel is drawn from it by the air flow.

Principle of lawnmower carburetor operation

Throttle flap determines the amount of air to be supplied, and the power of the motor directly depends on it.

STIHL FS 55. carburetor adjustment (idle speed)

The STIHL FS 55 grass trimmer in the video adjusts the rpm to the idle speed.

Adjusting the carburetor on the STIHL FS 55 lawnmower

STIHL lawn mower carburetor adjustment

FS 55 Parts Shop

A pump sucks fuel into the carburettor system (diaphragm). The carburetor of a brushcutter then passes through the nozzle in the carburetor. The fluid then moves through the inlet and outlet valves of the pump. Is filtered by the strainer. Fuel flows through the needle valve into the diaphragm chamber.

  • Air flow to the tube with an air baffle (damper). Baffle plate controls the intensity of the airflow.
  • The fuel system is inevitably clogged with a mixer to speed up the flow.
  • Gasoline through the float chamber and restrictor tube. The float chamber regulates the intermittent volume of fuel. In the float chamber, the pressure level is neutral, but in the tube with a narrowing is already small. Because of the pressure drop, fuel leaks through the nozzle.
  • The acceleration of the air stream makes the fuel (gasoline) flow and atomization. The end result is an air-fuel mixture of the right proportion or density.
  • The air-fuel mixture enters the engine cylinder through the fuel tube.
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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 choke is open, the greater the fuel flow and power.

Simply speaking, adjusting the carburetor on a STIHL power tool is all about keeping the fuel flowing properly.

How to adjust the carburetor on a ride-on lawnmower

Before adjusting, the filters should be thoroughly cleaned in accordance with the maintenance manual.

The upcoming adjustment of the lawnmower carburetor with their own hands is made by adjusting screws. There are three in total:

right (L). adjustment of fuel consistency for low revs.

It is necessary to find the highest idle speed. To do it slowly unscrew the screw (L) to the right and to the left.

To adjust, turn the screw a quarter of a turn anticlockwise at all times.

Lower (T) is responsible for adjustment of engine at idle speed.

For proper adjustment of the idle stroke specifically, it is typical to turn the screw a quarter of a turn anticlockwise:

  • steady operation of the cool motor;
  • Do not over-run at idle speed of the hot engine;
  • for the trimmer head high RPM reserve;
  • stable motor operation in case of position change (sudden raising or lowering of the blade).

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Left screw (L). adjustment of consistency at high revolutions. (The screw should be adjusted last).

the left screw (L) is used for general regulation of the maximum engine rpm, engine power, temperature and petrol consumption.

Adjust the carburetor lawnmower with the last screw is as follows:

  • Open the throttle to full, with all this give out full throttle. Turn the screw clockwise until the revolutions are lower (in this case, use your ear to guide you).
  • Turn screw as slowly as possible counter-clockwise until the motor does not work smoothly.
  • Then turn back quite a little, a little hear a measured, smooth operation.
  • For a more enjoyable implementation of the abilities more convenient to see the work of an experienced yuser:

Curiously, based on the beliefs of the creator of the video, setting (its correctness) determined by the color of the candle, not only the speed and stability of the engine.

Proper tuning of the carburetor with his hands in this case. the combustion of fuel consistency without residue, the color of the candle should be light brown.

Lawn mower does not start: the causes of damage and troubleshooting by hand

Gardeners sometimes have to deal with the occasional lawn mower that won’t start when they’re tending their own garden. There are many reasons for tool failure. In order to correctly diagnose the problem, the owner of a useful dacha machine needs to know the device and the principle of operation of its individual parts.

Since the gasoline grass trimmer is a complex device, before you start, it is necessary to carefully study the instructions for use. Very often it is simply ignored, or familiarized with it superficially. As a result, when the tool stalls or refuses to start, the question arises. “Why won’t the lawnmower start??” Long seasonal interruption of work, improper storage and untimely maintenance of the grass trimmer for grass, will cause a lot of trouble for the dacha owner, to eliminate the causes.

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Testimonial: STIHL FS 55 lawn mower. Lightweight, handy lawn mower for the care of the garden or homestead

The STIHL FS 55 lawn mower is ideal for use in the garden or outdoors. Lawn mowers are designed for mowing lawn grass, tall, thin stems and small growth (not to be confused with thin deadwood). 1 l of engine power. с. is powerful enough for garden lawns. It is usually equipped with a two-leaf blade as standard, but it is possible to install four-leaf and eight-toothed blades or a mowing head with a plastic string for cutting grass (fences, curbs, trees etc. are safe for mowing. д.)Because there is a gearbox (transmission) at the end of the shank.

STIHL 2-blade and 4-blade blades are sharpened on both sides for longer cutting time. Sharpened with flat files (fine-toothed) at an angle of 30 degrees. It is best to use the four-leaf blade for mowing meadow grass (not shredding it). To get the effect of laying the grass cuttings in a swath, you need to tilt the brushcutter slightly to the left (right). The grass cuttings fall on the blade guard and move it sideways with the grass brushcutter. For smaller shrubs (undergrowth). Use the eight-toothed blade.

Always pull the throttle trigger (maximum engine speed) to make it easier for the brushcutter to cut the grass. This does not mean you have to work at full throttle until the fuel tank is empty. The correct way to mow is to pull the throttle trigger, mow one side of the grass, release the throttle and work around it until you’ve mowed your lawn. If the area is heavily overgrown with grass and you just need to mow everything that grows there, then you can press the gas and mow the brushcutter left and right, but after 5-7 minutes of continuous load you need to release the gas lever and let the engine work for at least 30 seconds at idle to cool the cylinder.

When starting the brushcutter while the engine is still cold, let the machine idle for 1-1.5 minutes to warm up. If you don’t let the brushcutter idle for a while and then pull the gas pedal immediately, the engine may stall or skip a few revolutions. Once you have finished working, you need to clean all the brushcutter components, the air filter and the cylinder fins. Depending on how often you use your brushcutter you may need to check the amount of lubricant left in the gearbox. If there is not enough, you should take a special STIHL gear lubricant (80 ml tube) and squeeze 5 ml of lubricant into the hole in the gearbox.

Before long-term storage or winter storage, it is necessary to empty the remaining fuel mixture from the fuel tank, start the engine and let it run for a while to work out the remaining fuel in the carburettor (usually this lasts 2-3 minutes, without pressing the gas button). Before winter, you can still lubricate the cylinder with brand-name engine oil (no more than 10 ml) through the spark plug hole, pour it in and pull the starter rope a few times so that the piston has well lubricated the cylinder walls.

Replacing Fuel Line and Fuel Filter Weed Wacker STIHL FS 55R

WHAT NOT TO DO? Do not mount cutting blades on a brushcutter that are not designed for use with this model, though they fit in the seating (three-leaf, chisel, pointed). Why not recommended? The FS 55 brushcutter is equipped with a flexible drive shaft and a lowpowered engine (the blades specified are only for brushcutter models with rigid shafts and engine output over 1.4 L. с.).

These blades are heavier than two or four-leaf blades and therefore are harder for the engine to untwist. The heavy discs are more for cutting big weeds and working with these discs puts more load on the engine than necessary. In other words, the engine will run and the grass mower will mow, but not for long. Repair of the CGU at a service center costs about 70-80% of the cost of a new brushcutter!

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Another important thing to do. when the flexible drive shaft unwinds heavy discs, it works for torsion and then tears. So if your neighbor is working on a flex drive shaft with heavy cutting blades and says it cuts well, let him, and you will be smarter than him and extend the life of your brushcutter!

It is also not recommended to work for a long time (without partial breaks) under load, it can lead to overheating of the engine and its wear. If you ever notice anything unusual about your brushcutter (a metallic noise, friction effect, unstable engine rpm, loss of power, etc.). д.). Have it checked by a STIHL servicing dealer. Do not let your brushcutter run until it really jams or stops starting. Repair will cost you more!

Before using your brushcutter it is absolutely essential that you read the instruction manual carefully. By following all the recommendations written there, your lawn mower will run for a long time without needing to call for service. Do not use unproven motor oils (not original).

From my own experience in service. In 90-95% of all STIHL tool users come to us for improper use of their tool! If used correctly and serviced in time, STIHL FS 55 brushcutters get into service for the first minor repairs (nothing is everlasting), at least after 6-8 years of operation!

If you have any questions or need advice, write and I will do my best to answer them.

How to adjust the carburetor on a gasoline mower

Before adjustment you need to clean filters thoroughly according to maintenance in the manual.

The lawnmower’s carburettor must be adjusted with your own hands

is made by adjusting screws. There are three of them in total:

Right-hand (L). fuel consistency adjustment for low revs.

Need to find the highest rpm at idle speed. To do it slowly turn the screw (L) to the right and to the left.

turn the screw a quarter of a turn counterclockwise to adjust the idle speed.

Lower (T). responsible for motor adjustment at idle speed.

For proper adjustment of idle speed specifically is typical:

  • Left (N). adjustment (Screw should be adjusted last);. Steady running of the cool motor;
  • the hot motor revolutions are not excessive;
  • high rpm allowance for the trimmer head;
  • stable motor running when changing position (suddenly raising or lowering the blade).

Left (H). adjustment

consistency at high rpm. (The screw should be adjusted last).

the left adjusting screw (H) affects the general regulation of the highest rpm, the engine power, the temperature and the gasoline consumption.

the lawnmower with the last screw should be adjusted as follows:

  • Open the throttle to full, while giving full throttle. Turn the screw clockwise until the revolutions fall off (in this case, guided by hearing).
  • Turn the screw as slowly as possible counterclockwise until the motor is uneven.
  • Then there’s absolutely no turning back, just hearing the measured, smooth operation of the.
  • For more enjoyable implementation abilities more convenient to see the work of an experienced user:

Curiously, based on the belief of the creator of the video, setting (its correctness) determined by the color of the candle, not only the speed and stability of the engine.

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