Do-it-yourself trimmer repair Shtihl and operating instructions for FS-38 and 55 (Stihl FS), carburetor adjustment

It is natural for a person to ennoble the place in which he spends the lion's share of his time. City residents resort to the services of designers, or they themselves try to change something in their home, buy new furniture, wallpaper, so that when they come home after a hard day, they can mentally rest and relax in a favorable environment. Residents of their own houses located outside the city have completely different concerns and requirements. It is necessary to promptly mow shrubs, grass, various dead wood, and carefully monitor the condition of the plot and garden. It is clear that this requires slightly different means of achieving comfort. And here a new brainchild of engineering comes to the fore - mowers.

What Gasoline to Pour into the Shtil Lawnmower

Hi all!
Glad to see you again, dear readers and subscribers to Andrew Stuk’s blog. Anyone who has a chainsaw at home knows exactly what gasoline is and how to refill it. But everyone who just wants to buy such a device finds the article interesting. Chainsaw. one of the most convenient and versatile household units. You must prepare the fuel mixture before use. But for proper operation of the device, you must follow all the manufacturer’s recommendations. Each model is different, so what kind of gas should you put in your chainsaw?

Under the brand

For modern brands, for example, Huskvarna, Partner, Makita, Echo, Calm, AI-92 gasoline is suitable. Today, only a huge number of people complain about the premature failure of their chainsaw due to bad gasoline. Therefore, some experts recommend pouring AI-95 into such chainsaws. At the same time, a good AI-95 can “burn the piston”, and again some people find a compromise and mix AI-95 with AI-92. In general, it all depends on the quality of gasoline and ultimately you decide.

For Ural-Druzhba household tools, it is recommended to use AI-80 gasoline. It is very important that fuel consumption is minimal.

Preparation of the mixture: important proportions

When using a two-stroke engine, clean fuel is purchased separately and mixed with oil, often in a ratio of 1:50. It is impossible to install an oil pump in such an engine, so it is strictly forbidden to pour pure gasoline into the chainsaw! Proportions, quantities and some brands of the manufacturer are indicated in the instructions.

Important points during the cooking process:

• Chainsaws work with oil M8-V, M-12TPU, M8-V, TP, MGD-14M. In some cases foreign variants may be used;
• Proportions: 2.5 liters of FI-80 gasoline per 100 grams of oil;
• Foreign models are characterized by minimal fuel consumption. They run on foreign oils and have proportions of 1:40 or 1:50.

Fuel mixture

To properly prepare fuel, you will need a list of additional tools:

1. Plastic or metal container for diluting the substance;
2. Measuring bottle for gasoline;
3. Spray;
4. Syringe;
5. Funnel for pouring the chainsaw into the tank.

Some manufacturers, such as Stihl, make metering tanks out of the box to make measuring the fuel mixture easier.

Different manufacturers produce oils in different colors. HP produces a red liquid. Green tint. premium synthetic segment. For Husqvarna chainsaws, you need to use the appropriate brand of oil. It has high value, good quality and is green or blue in color.

Types of motor oils, their purpose

Motor oil is a special formulation of solvent and additives that reduce friction, create suitable fluidity, and prevent thickening as temperatures drop.

According to the method of obtaining the composition there are:

• minerals acquired during the distillation of oil;
• synthetic – by synthesis or processing of natural gas;
• semi-synthetic – improved mineral oil due to the introduction of synthetic components.

For safety reasons, so as not to confuse the products, the oil is colored reddish, blue or green. The assortment differs in composition; the user must purchase oil marked: “for garden equipment” 2T, if it is necessary to prepare a mixture for a two-stroke engine

, 4T for filling into the crankcase.

Synthetic and mineral oils have different bases and cannot be combined. When switching to another type of oil, the system must be thoroughly washed.

Oil

for lawn mowers should be classified according to vehicle oils created for engines

with air cooling with a combustion chamber volume of 50-200 cm 3 When choosing a product, the fundamental parameter is not the cost, but the protective characteristics for a motor of a certain brand. Therefore, first they purchase the recommended oil, and if it is not available, they select one that is similar in terms of performance.

The alkaline number determines the quality of lawn mower oil. Alkali neutralizes the oxidation process of rubbing materials and slows down the destruction of the surface. When oil becomes oxidized, it loses its protective properties. The usual pH of oil is 8-9 units.

The main indicator is viscosity. That’s why there are winter, summer and all-season oils. What oil

For a lawn mower, it depends on whether the user will work at sub-zero temperatures. Summer oils thicken even with slight cooling. The flash point indicates how quickly the oil will burn out of the composition. Features of fuel for two-stroke engines and classification of oils. Practical advice on how to dilute gasoline with trimmer oil. It is normal if this indicator is more than 225 C.

How to dilute gasoline with trimmer oil

You need to dilute gasoline for the trimmer in the correct proportion. An insufficient amount of oil can lead to poor lubrication of the trimmer elements, which contributes to rapid wear. If there is more oil than required, carbon deposits will form on the pistons and spark plugs. Carbon deposits on the moving parts of the engine interfere with normal operation and lead to early engine failure.

What proportion is required for a specific trimmer model can be found in the attached instructions. Most often, for 2-stroke gasoline motor mowers, a fuel mixture is used in a ratio of 50:1, where 50 is part gasoline, 1 part oil. That is, 20 ml of oil should be added to 1 liter of gasoline. The table will help you choose the required ratio.

To measure proportions correctly, use measuring containers with a milliliter scale. A special canister with a double neck is perfect for these purposes; it is designed for mixing and storing oil and gasoline. For example, oil can be drawn up with a medical syringe without a needle. Before mixing liquids, make sure that the container for the finished fuel mixture is free of water, dust and dirt particles.

It is unacceptable to dilute gasoline with lubricant directly in the fuel tank, and the proportion of oil and gasoline must be strictly observed. If you ignore this rule, the operation of the trimmer motor may be unstable, which is why it will quickly fail.

It is not recommended to use plastic bottles or canisters for this purpose. This is due to the fact that gasoline tends to dissolve plastic, which means that some of the plastic can get into the fuel tank, which can lead to carburetor failure. Although there are special plastic canisters marked “flame”.

To do this you will need:

• petrol;
• oil suitable for two-stroke engines with air cooling system;
• canister, preferably metal;
• mixing container, also preferably metal;
• gloves;
• respirator.

In addition to protective equipment, do not forget about fire safety rules, because gasoline and motor oil are highly flammable:

• It is better to carry out work outdoors to avoid the accumulation of gasoline vapors indoors;
• Do not smoke or create situations that could cause a spark.

Make a mixture of gasoline and oil as follows:

1. Pour 1 liter of gasoline into a container, add half the required portion of oil. Mix thoroughly, do this with extreme caution, away from sources of open flame.
2. Add the rest of the oil to the trimmer gasoline and mix thoroughly again. Now fuel can be poured into the trimmer's fuel tank.

The mixture can be stored for no more than three months, so it is better to dilute gasoline in such an amount that it is enough for several uses.

For dilution, you can use only high-quality oil, and it is recommended to purchase it only in trusted stores, for example, in specialized hypermarkets.

Recommendations for use

It is necessary to take temporary breaks from work. This is necessary to ensure that the device’s engine does not overheat and fail prematurely. For amateur models, a break is provided every 20 minutes for the same amount of time. For professional mowers, work must be interrupted every 50 minutes, in which case the downtime should be at least 10 minutes.

You need to monitor the condition of the fuel tank. If you do not plan to use the mower for a certain period of time, it is better to drain the remaining fuel from the tank compartment. This will help avoid damage to engine parts.

Terms of use

Getting the mixture

How much oil should you pour per liter to get a high-quality gasoline mixture? It would seem that there is nothing difficult about mixing two substances. Preparing the mixture is often complicated by the fact that different sources provide different information. For example, the instructions indicate a proportion of 1 to 40, on the fuel tank of the trimmer 1 to 25, and on the oil canister 1 to 50.

Most experts believe that you should mix according to the instructions on the oil package.

There are a number of requirements for how to carry out dilution. Don't add too much oil. This leads to a decrease in ignition characteristics. As a result, the efficiency of the power unit is devalued and its service life is generally reduced. If the gasoline mixture is oversaturated with oil, soot deposits will form on the inner surface of the engine walls (cylinder ventilation windows). This is fraught with the formation of scuffing on the piston.

Stihl FS 55 brush cutter device

The Stihl FS 55 trimmer stands out for its well-balanced device, which is typical for household lawn mowers. The model is powered by a gasoline engine, the development of which used Stihl 4-MIX proprietary technology. The motor design includes 1 chrome-plated cylinder and a forged piston with an increased power reserve. This arrangement makes the trimmer's internal combustion engine virtually silent and economical in terms of fuel consumption.

To safely start the standard internal combustion engine, the manufacturer included an ElastoStart starting handle in the original package of the Stihl FS 55 brush cutter. It has a smoother ride and eliminates possible kickback when pulling the cable. The starter device includes an additional spring, which effectively softens possible shocks during the return movement of the coil.

For smooth operation of the internal combustion engine, the manufacturer equipped the trimmer with an improved electronic ignition. It provides high voltage when the fuel mixture is ignited, which leads to its complete combustion without sedimentation of fuel residues on the internal walls of the muffler.

The manufacturer will include a diaphragm carburetor equipped with an enlarged combustion chamber in the original package of the Stihl FS 55 brush cutter. All basic spare parts of the unit are made of forged metals, which are resistant to rust and overheating.

The force generated by the brushcutter engine is transmitted through a rigid drive shaft to an all-metal aluminum gearbox. Subsequently, the torque from the internal combustion engine is taken over by the rotor system, which rotates the mowing head or cutting blade. This arrangement increases the speed of the brush cutter and makes it as efficient as possible, regardless of the thickness of the weeds being cut.

For more comfortable operation, the manufacturer has included in the basic equipment of the Stihl mower a comfortable shoulder strap made of soft, durable materials. The brush cutter also comes with a 2-hand bicycle handle, which can be adjusted over the entire height of the bar. Almost all controls are located on the right standard handle of the model, which makes it more convenient to operate the tool in hard-to-reach places.

Fuel mixture proportions

If the mixture is diluted correctly, for example, in compliance with the instructions below, then the equipment will serve you for many years without serious technical breakdowns. In this case, fuel consumption will be low and the work result will be high. The process of preparing fuel should always be the same and constant. It is better to always use the same ingredients, without changing the brand specified by the manufacturer.

You shouldn’t add a lot of oil, as this can damage the engine’s performance, but you shouldn’t skimp on it either. To maintain the correct proportions, always use the same measuring container so as not to make mistakes with the quantity. To measure the oil, you can use medical syringes, but some manufacturers also provide measuring containers with marks along with the oil.

The most correct ratio of oil and gasoline is considered to be 1 to 50, where 50 is the amount of gasoline and the amount of oil is 1. For a better understanding, let us explain that 1 liter is equal to 1000 ml. This means that to get a proportion of 1 to 50, we divide 1000 ml by 50, we get 20 ml. As a result, only 20 milliliters of oil need to be added to 1 liter of gasoline. To dilute 5 liters of gasoline you will need 100 ml of oil.

In addition to maintaining the correct proportions, it is also necessary to observe the technology for mixing the ingredients. Under no circumstances should you simply add oil to the gas tank. It is better to follow the following step-by-step instructions.

• To dilute the mixture, you need to prepare in advance a container in which you will mix gasoline and oil. This can be a clean metal or plastic canister with a volume of 3, 5 or 10 liters to make it easier to calculate the amount of oil. Do not use drinking water bottles for this purpose - they are made of thin plastic that can be dissolved by gasoline. To measure oil, use a special measuring container. But if there is no such thing, then, as already noted, medical syringes with a large dosage are suitable.
• Pour gasoline into the canister, without adding a couple of centimeters to the full volume. To avoid spilling gasoline, take a watering can or insert a funnel into the neck of the canister. Then take the required amount of oil into a syringe or measuring device and pour it into a container with gasoline. It is not recommended to do the opposite - pour gasoline into oil.
• Close the cap tightly with the bottle and stir the resulting mixture. If some of the fuel spills out while preparing the mixture or stirring it, you must immediately wipe the canister with a dry cloth.
• Be sure to follow fire safety precautions. Dilute the mixture away from fire and under no circumstances leave residual fuel and used materials within the reach of children.

And one more important point: it is better to prepare exactly the amount of mixture that fits in the fuel tank of your brush cutter. It is not advisable to leave any remaining mixture.

Which lawn mower should you choose?

In order to have a beautiful green lawn on your property, you need to constantly care for it, namely, trim the grass. Therefore, it is important to purchase a high-quality gasoline trimmer that will last a long time. The modern lawn mower market offers a huge range of products, so it is often difficult to make a choice in favor of one model or another, especially for beginners.

When choosing a unit, you should adhere to some rules:

• Among the wide variety of models, you should opt for units with high power, since the fast and efficient operation of the trimmer will depend on this indicator. The engine should start effortlessly and have a system that regulates emissions of harmful substances. A light-weight unit is suitable for home use;
• The size of the tank depends on the time of continuous operation of the machine. The more fuel is poured into the tank, the longer the lawn mower can work, but the weight of the tool in this case will be greater;
• If you want to purchase a trimmer whose noise level during operation will be low, it is better to opt for devices with a four-stroke engine. The cost of such devices is higher than with a two-stroke engine, but they are much simpler and more enjoyable to operate;
• If you plan to mow a large amount of weeds or make hay for livestock, it is advisable to choose professional trimmers that can withstand significant loads for a long time. If the work will be carried out solely to improve the landscape design, then attention should be paid to the cutting parts of the device;
• the presence of a large number of trees, bushes or stones on the site precludes the use of a trimmer with metal blades. In this case, it is better to prefer a model with a cutting line, which will prevent damage to trees and the tool itself;
• The ease of use of the unit also depends on its handle. To work in large areas and with a wide swing, you should opt for a T-shaped handle, and for processing difficult-to-pass thickets, it is advisable to purchase a trimmer with a D-shaped handle.

Video: What Gasoline to Pour into Shtil Lawn Mower

The main thing is to correctly calculate the proportions of the mixture. Excess oil can form soot on pistons and spark plugs. Excess gasoline can cause engine malfunction or clogged pistons. Each manufacturer gives its own proportions to models of different power.

You will need the above accessories to mix the ingredients. Special cans with two holes for oil and gas can also be found on sale. Everything is very simple here, pour in the ingredients, close the lid tightly and mix by tilting the container. You can use glass and plastic bottles.

Water or dust must not get into the fuel mixture.

Good to know

Fuel must be prepared for 3 refuelings. After all, storing a large amount of fuel can negatively affect the operation of the chainsaw. The mixture may behave differently because it will depend on many factors. As a result, your home appliance may be seriously damaged, resulting in financial costs.

Features of using electric models

The main advantage of electric mowers is the presence of an electric motor, so to use the mower you only need to have sockets near the place of work.

More details about safety precautions can be found in the instructions.

The battery of the electric model takes about 200 minutes to charge, and the operating time until completely discharged is 20 minutes when using plastic knives and only 12 minutes with a string.

Rules for using a lawn mower:

• Make sure that the trimmer frequency matches the mains voltage;
• Make sure the cable, plug and extension cord are intact;
• Do not touch current-conducting elements with wet hands;
• Only use a suitable extension cord.

If everything is in order with the electrical equipment, then we check the carburetor.

Vacuum carburetors are installed on trimmers. When disassembling, cleaning or washing it, you need to be extremely careful - under no circumstances disassemble the lower part of the carburetor, where the primer is located. The air filter (it is visible if you remove the protective casing from the carburetor) must be washed with detergents. Best for washing dishes. After drying, put it back. We wash the carburetor with clean gasoline and blow through all the holes with a pump. We also wash the fuel line filter, then dry and assemble everything. Usually, after all the manipulations, the trimmer starts working.

A thin cable instead of a fishing line, is it worth installing it on a brush cutter?

This thought comes to the mind of almost everyone who has had to mow 10 acres overgrown with tall grass. At first glance, the idea seems good. The cable is stronger than the fishing line and does not wear out as much. However, not all so simple.

Analogs

Among the analogues of the Stihl FS 55, one can highlight the Husqvarna 129R model, which is accompanied by a two-stroke engine with a power of 0.85 kW and a gasoline engine.

The Makita EM2600U lawn mower can be very elegant and easy to use. The device is ideal for mowing weeds and bushes in the local area of ​​the land. Engine power 1.2 hp with an engine capacity of 25.7 cc. cm.

The Hitachi CG27EC brush cutter may be perfect for cutting grass. Thanks to the built-in S-start system, the engine will start quickly, and labor-intensive work will be carried out comfortably. Engine capacity 26.9 cc. see, at a power of 1.1 hp.

How to mix

If you do not have a special measuring canister with divisions, which are included in the kit of every trimmer worthy of attention, or such a container is lost, then use any suitable container. Better glass or metal. Plastic can also be used, but you need to choose a bottle with hard walls.

The capacity of the vessel must be a multiple of 1 liter. You can take a 1.5 liter bottle, but practice shows that this is not entirely convenient. You also need a medical syringe, preferably 20 - 50 milliliters. First, gasoline is poured into the container, then a precisely measured amount of oil (by volume) is added. The procedure cannot be changed.

If you have “pre mix” oil, then you need to close the bottle or canister with a lid and turn it upside down several times and shake vigorously. If the oil is “self mix”, then it will dissolve on its own. The prepared mixture must be used throughout the day. If you know how much fuel a trimmer consumes for a certain amount of work (or time), then calculating the amount of mixture is not difficult. Otherwise, before each refueling, dilute the new fuel so that a minimum amount remains until the end of the work.

Bottom line

Many may be put off by the relatively high prices of Shtil products, but if you think about it, what is more important - reliability and good results or savings that come at the expense of quality? But, if you set out to save money, then we offer you the option of a do-it-yourself lawn mower; by assembling the device with your own efforts, you will know all the nuances and structure of the tool.

Of course, you can choose cheaper Chinese analogues, but then no one will be able to vouch for the result of the final work and for the service life, which can be very short for such models. So it is more profitable to purchase a mower once from a reputable company, which Shtil certainly is, and enjoy stable operation over many years of operation.

Grass cutting tools

A large number of different tools are intended for processing grass areas. When choosing such equipment, you need to familiarize yourself with the range of products. Stihl has the following types of gasoline devices:

• 
  Light braids FS 38, FS 45 CE, FS 50 CE, FS55, FS.

• Powerful models FS 70 CE, FS 94 RC-E, FS 100, FS 120, FS 130, FS.
• Battery-powered scythes.
• Operated from the network.
• Brush cutters.
• Backpack braids.

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

Signs of imbalance

The carburetor must be debugged during the manufacture of the device. As a rule, owners learn about the need to adjust the fuel supply with their own hands only after quite serious breakdowns, during the process of correcting which the module was removed and, for example, cleaned.

Signs of a settings failure include the following:

Do-it-yourself trimmer carburetor adjustment

Setting up the module is not a repair and replacement of spare parts is not required. In this case, the lawnmower carburetor repair kit will not be needed.

There are three screws for debugging:

• L – is regulated first, since it is responsible for fuel supply at low speeds;
• H – it is responsible for the supply of gasoline at high speeds, as well as fuel consumption and temperature;
• T – it is used to debug the idle speed.

There are options, as a rule, this is the carburetor of a Chinese lawn mower, when for debugging there is only one screw left on the body - for adjusting the idle speed. This does not mean that the module is configured automatically - it means that even such a type of repair as debugging will be difficult. The photo shows the adjustment of the carburetor of a Chinese lawn mower.

• The module is configured only when the engine is warm: to do this, the device is first turned on for 10 minutes. If the mowing head rotates at idle, then begin debugging immediately: turn screw T counterclockwise until rotation stops.
• The adjustment begins with screw L. The screw is turned to the right and left until a position is found at which the idle speed does not become maximum.
• Then the screw is turned ¼ turn counterclockwise. This will be his working position.
• The idle speed must be adjusted
  by turning counterclockwise to increase the speed and clockwise to decrease it. Its debugging consists in achieving a mode in which a sufficient number of revolutions are made before the mowing head begins to rotate. In this case, the engine must operate stably in different positions.
• The position of screw L is determined last - at maximum speed the trimmer
  should not operate for more than 10 seconds. The throttle opens, the screw is turned clockwise, very slowly, until a decrease in the number of revolutions is heard by ear.
• Then the screw rotates slowly counterclockwise until the motor begins to malfunction. After which the screw is turned back clockwise until the engine starts working normally again.

If there is a tanometer, and if the recommended speed values ​​are indicated in the product data sheet, the correction can be carried out more accurately, focusing not on hearing, but on the readings of the device.

The trimmer carburetor adjustment in the video was done by ear.

to the entry “Adjusting and repairing the carburetor of lawn mowers”

Dmitry Pavlovich 07/04/2016

Please clarify. In the adjustment section, item 5, is screw L an error? Should you read screw A? Thank you.

tell me the initial position of the HL LA screws

PROMPT THE STARTING POSITION

tell me the initial position of the HL LA screws

Thank you very much for the video about the accelerator, I didn’t know that the defect is very important and creates a huge problem that almost everyone is silent about. BRAVO….

Maybe the tachometer is a speed meter, and not a tonometer, a blood pressure meter

and I have L,H,LA, is this LA instead of T?

In the video he’s kind of slow-witted, so you have to know how to chew snot.

Principle of operation

Carburetor is a power system module in which liquid fuel and air are mixed before being supplied to the engine cylinders. Depending on the tool and its operating mode, mixing and feeding are adjusted accordingly.

The structure of the lawn mower carburetor is the same in almost all cases. It belongs to the category of float devices. The latter provide stable parameters for the finished mixtures.

The operating principle of the module is as follows.

The more open the air damper in the tube, the higher the air flow density, which means more fuel enters the cylinder. Setting up the carburetor of a lawn mower comes down to setting the valve ratio at which the density of the fuel mixture becomes optimal.

Fuel consumption

One of the most important questions that owners of sawing tools have, because everyone wants to know what to expect.

The volume of virtually all tanks is approximately 500 ml. If the power of the chainsaw is two kW, then the fuel consumption will be approximately 1.2 liters per hour of operation. To put it simply, such a tool will be able to work at maximum speed for half an hour without a break. If the chainsaw is not so powerful, then its tank volume will be much smaller. So the user can independently control fuel consumption.

Over time, the user will learn to create a service for his own tool without any help. The main task will be to maintain the economic unit in good working condition, using high-quality fuel mixtures. Follow safety rules when producing flammable water. This will help preserve the instrument and not harm yourself or the environment.

Repair and adjustment of the Stihl 180 chainsaw carburetor

Stihl 180 is a German chainsaw designed for working in the garden, collecting firewood, clearing the site and for other work with wood. Many people loved it for its compactness and ease of use. The tool combines seemingly opposite qualities - power and maneuverability. German designers did their best to create this model, but the MS 180 Stihl also has disadvantages that users encounter in various operating conditions. Like all mechanisms, it tends to fail. What to do in such cases and is it worth contacting workshops?

Performance characteristics of the Stihl 180 chainsaw