MF 70 Czech mower - instructions, comparison with analogues and dealer analysis

Carbon accumulation in the muffler

Before resorting to more serious repair actions, you need to make sure that the exhaust channel is working properly. This section does not apply to previously unused trimmers, since they have practically no output. If the lawn mower has been in use for many years and during this time the unit has not been subjected to serious diagnostic measures, then it is imperative to check whether the muffler is clogged.

The accumulation of carbon deposits prevents exhaust gases from escaping, making it simply impossible to start the engine. Of course, the outlet channel cannot become clogged overnight, which is why such a situation must be preceded by certain signs. The release of black smoke from the muffler is a kind of soot that gradually accumulates on the walls of the exhaust system. There may be a significant increase in the sound of the installed engine, which is associated with overcoming the enormous resistance of the exhaust gases to release them. When idling, the device spontaneously stalls. In critical situations, engine performance deteriorates significantly.

If there is serious contamination on the anti-spark mesh, then the reason for the inability to start the trimmer engine may lie precisely in the exhaust channel. You need to clean the mesh as carefully as possible, since black soot is a very dangerous carcinogen for humans, which can cause damage to the respiratory tract. For cleaning, you should use specialized products that can cope with carbon deposits.

Signs of problems with the fuel level in the carburetor

Before starting to repair any component of a car or other vehicle, it is important to make sure that the problem is caused by a particular component. In the case when the carburetor is flooded, checking the malfunction of this particular unit is very simple - just analyze the behavior of the car and pay attention to some aspects of its functioning. In particular, if there is a problem with fuel supply, the following will be observed:

• difficulty starting the engine, especially with a well-warmed-up engine;
• unstable or high idle speed;
• problems with setting “idles”;
• streams or real puffs of black smoke from the exhaust pipe;
• dips with medium and strong pressure on the gas pedal;
• black velvety soot on the spark plugs.

Note that such symptoms are also observed when fuel is overflowed from the carburetor of a chainsaw, a motorcycle, a moped, a car, and even on a walk-behind tractor. However, in units with a small and, as a rule, parallel fuel system, such as a multicultivator, moped or scooter, another sign is also observed - the presence of gasoline in the air filter. If such a symptom occurs, then we can guarantee that the carburetor is overflowing and requires taking some measures.

READ Is it possible to lubricate the trimmer with grease?

Spark plug performance

If there is a need to figure out why the trimmer does not start, then you should check the condition of the contacts of the installed spark plug. In this case, you can figure out why the lawn mower engine does not start. To properly diagnose a spark plug, you must adhere to the following scheme:

• If during dismantling it was discovered that the spark plug was wet, then there is a certain amount of fuel in the small combustion chamber, which there is no need to rush to get rid of. To fix the problem, you need to dry and thoroughly clean the contacts. After these manipulations, you should carefully connect the candle. You need to turn on the ignition and pull the starter handle without any extra effort. If the device is working properly, then a constant and bright spark will appear. Otherwise, you will have to replace the spark plug.
• The ideal state of the electrodes involved is when they have a characteristic dark brown soot. If the spark plug has white or even black carbon deposits, and is also wet, then it must be replaced immediately.
• The trimmer may not respond to startup due to the fact that there is too much gap between the spark plug contacts. To set the optimal gap, it is necessary to use special gauges of different sizes.

If after all the manipulations done the engine of the lawn mower does not start, then the cause of the malfunction must be looked for in the carburetor or heat pipe. Otherwise, you will have to check the serviceability of the high-voltage wire involved.

Eliminating overflow in the carburetor

A lot can be written about how to eliminate carburetor overflow. Our resource decided not to describe each method of solving a problem separately, but to present how to act when it appears, clarifying all the details. In general, the repair procedure is as follows:

• First, you need to check all components that can be checked without removing the carburetor, and then repair them or replace them if a problem is identified. Such elements of the fuel system include:
• fuel pump (disassembled, integrity of diaphragms and other elements is checked);
• check valve (its appearance is examined and integrity violations are identified);
• carburetor gaskets (check for gasoline leaks at their locations);
• solenoid valve (to check, just unscrew the valve and connect it to the network; if after 30-120 seconds the needle has not moved out a few millimeters, the unit requires replacement).

If no problems are identified, the carburetor is dismantled.

• After removing the carburetor, you must:
• First, check the operation of the throttle valve and the integrity of the needle diaphragm;
• Secondly, disassemble the unit, checking the integrity of gaskets, jets, their O-rings, floats, locking needles and other elements, the failure of which can cause overflow;
• Third, clean and bleed all carburetor fuel passages.

Naturally, when problems are identified, they are eliminated, the part is reassembled and put into operation. However, before installing the carburetor, it is important to configure it correctly. Everything regarding carburetor settings is individual for each unit, so we will not focus on this. Note that in some cases it is enough to adjust the mixture quality screws or the size of the jets, and in some cases you will have to “play” with the level of the float chamber or the position of the diaphragm needle.

• Well, at the last stage, if the measures presented above did not produce results, all that remains is to take the carburetor or take the entire faulty vehicle to a specialist. Do not forget that a carburetor is a very complex device, so sometimes only a professional can handle its repair.

We strongly recommend that you resort to the last step of repair first if, when you see the carburetor, a thought pops into your mind: “What should I do, I don’t understand anything about this...”, or something similar. In such a situation, it is better not to aggravate the problem by doing your own repairs, but to trust a specialist, even if it costs some money.

In general, dealing with a carburetor that overflows gasoline is not so difficult. The main thing in the analysis process is to act taking into account your knowledge and the provisions presented above. We hope today’s material answered your questions. Good luck with the repairs and on the roads!

Checking the fuel mixture

Let's say your trimmer won't start. In this case, the first thing you need to do is check whether there is enough fuel in the tank, and also evaluate the quality of the fuel mixture. It is necessary to refuel a motorized unit exclusively with high-quality gasoline. It is recommended to use fuel of a grade not lower than AI-95. Refilling the trimmer with fuel of unknown origin, purchased not at a gas station, is fraught with frequent malfunctions of the tool. This may cause damage to the cylinder-piston system. Repairs in this case often exceed the cost of the device itself.

Why won't my petrol trimmer start? This can also be caused by improper preparation of the fuel mixture, which consists of oil and gasoline. The proportions in which these components are combined are indicated by the manufacturers in the trimmer's instruction manual. It is highly not recommended to prepare the fuel mixture in large volumes, that is, for the future. After all, with long-term conservation, a loss of the defining properties of the substance occurs. Therefore, if the trimmer does not start, you should drain the old fuel and use a freshly prepared fuel mixture.

How to find out if your lawn mower's carburetor needs adjustment

Many craftsmen use lawn mowers for a long time, and do not think about the need to adjust the carburetor of the tool. When is it necessary to adjust the carburetor on a lawn mower or brush cutter? If you are asking this question, then you are probably seeing changes in the operation of the engine that are not for the better. In order not to guess and not to miss the moment when it is necessary to adjust the carburetor, you should adhere to the following recommendations on the need for adjustment measures:

1. After the engine has been run-in. Typically, running-in lasts for the duration of burning 4-5 liters of fuel.
2. When a fuel mixture of a different composition is poured into the tank, that is, the type of oil (even its color) and the brand of gasoline change
3. When weather conditions change, however, this is more relevant for chainsaws, gas generators and motor pumps, which are used not only in summer, but also in winter.
4. If the lawn mower has not been used for a long time. The reason for the need for adjustment may be the winter break.
5. When fuel consumption increases
6. If black carbon deposits are detected on the spark plug electrodes
7. If there is no gasoline entering the cylinder or the engine starts poorly
8. If a large amount of exhaust gas is detected
9. Unstable engine operation, as well as difficult starting and “sluggish” speed gain

As you can see, there are enough reasons to adjust the carburetor of a lawn mower. Typically, craftsmen who have been working with a tool for a long time can hear changes in the operation of the motor, which indicates the need for an adjustment process. Even if you are not sure about the need to carry out adjustment work, then performing it out of turn will definitely not be superfluous.

Large range of petrol tools and accessories at affordable prices

The Kosi Kosa store's assortment includes a huge selection of specialized products designed to perform work or support important functions of work tools. So, depending on the buyer’s requests, the online catalog offers a choice of:

1. Tools:
   modern lawn mowers of the brands Goodluck, Baikal, Karpaty and other manufacturers;
2. gasoline saws with a choice of power and cutting parameters.
3. Spare parts:
   professional spare parts for chainsaws made in China and CIS countries;
4. high-quality spare parts for lawn mowers;
5. spare parts for electric saws and other assortment.
6. Accessories:
   accessories for gasoline scythes;
7. original candles;
8. guide bar for a chainsaw of the required length;
9. knives for lawn mowers;
10. chain files;
11. lubricants for brush cutters and saw oil of the required consistency, depending on the units of use.

If you need to buy gas-powered tools online, each spare part is provided with a link to the consumer basket, which greatly simplifies the ordering process. Phone numbers of a manager are also available, who can answer questions, tell you what spare parts are in stock now, how quickly collection and delivery to the buyer is carried out, and will also help you select the necessary elements and order them in the right quantity. “Mow Scythe” is a modern online store where any buyer can buy spare parts for a chainsaw or lawn mower at an affordable price.

The most common causes, methods of elimination

NOTE! When carburetor , you must first check the adjustments and settings of the first and second float chambers.

How to flush a chainsaw carburetor?

To clean the unit from heavy contamination, it is best to use a product that is sold in pressurized cylinders. The cleaner comes with a dispenser and a long thin tube, which makes it possible to spray the product in any hard-to-reach places.

READ How to choose a petrol grass trimmer

It must be remembered that cleaning the carburetor on a chainsaw is done using flammable chemicals. You need to work with them wearing a special protective mask and only in well-ventilated areas.

To clean the carburetor on a chainsaw, the unit will need to be partially disassembled. The throttle valve, adjusting screws, body and other parts of the carburetor will need to be washed with the product from the bottle and set aside until completely dry. Once all the elements are dry, the assembly can be assembled and installed back on the chainsaw.

pours candle on a lawn mower

1. Use a spark plug wrench to unscrew the spark plug and check its condition. If the spark plug is wet and sparks of course, then it has been flooded. We open the air damper, turn on the switch button, squeeze the gas “all the way” and start it. Excess gasoline should come out of the exhaust saw and the saw will start.
2. Use a spark plug wrench to unscrew the spark plug and check its condition. If the spark plug is wet and there is a spark, then it has been flooded. Turn the chainsaw over with the spark plug hole facing down and turn the starter 10 times, while excess fuel will flow out of the engine cylinder. Then wipe dry (calcinate) the spark plug, or replace it with a new one and try again to start the engine exactly following the instruction manual. If the spark plug is completely dry, this means that no fuel is entering the engine. And since it is in the tank, there may be a problem in the carburetor. You can put a little consistency into a syringe, inject it into the cylinder, tighten the spark plug and try to start the engine. If the engine starts and then stalls, the problem remains and you need to contact a service center.

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Probably garden tools are useful and effective, but there are times when the equipment refuses to work. Among them was a trimmer, which can be used to mow both a small clearing and large lawns.

There are various reasons why a gasoline trimmer does not start:

1. The most common cause of breakdown lies in the wrong choice of fuel. Often, very economical users of the device fill the tank with something incomprehensible, but in no way flammable with a regular octane rating. Bad fuel, kept in a plastic canister for a long time, has a terrifying effect. The device, which has therefore lost its functionality, is sent for a complete overhaul of the mechanism.

Manufacturer and type of carburetors

The dose elements prepare a mixture consisting of fuel and air, then helping to distribute it moderately across all cylinders of the car engine. Gasoline and air can be mixed using 2 different methods. Carburetors with a membrane-needle device have one operating mechanism, float carburetors have another. In the VAZ-2107 car it belongs to the second type of design.

The manufacturer of the mechanism is the DAAZ enterprise, or the Dimitrovgrad Automotive Unit Plant. Correct setup and adjustment of the “seven” dosing systems is an important means of ensuring long-term operation and maintaining the operating condition of the motor throughout its entire service life. To understand why the carburetor overflows , you need to understand how the process of forming the consistency is carried out.

Fundamentally! Before you start making adjustments, you need to establish exactly what type of device is used in the motor design. This will make it easier to find why the carburetor . If it has a vacuum ignition corrector, it means the car is equipped with the latest model VAZ-2103 or VAZ-2106 engine. Carburetor modification 2107-1107010-20.

It may be that the “seven” has a six-wheel engine. In this case, the dosing system will not have a vacuum ignition corrector. A similar modification of the carburetor is 2107-1107010-10. These two designs differ slightly, but each model has its own subtleties of adjustment and tuning. Knowing them, you can understand the reason why carburetor .

The petrol mower is overflowing, what should I do?

Useful information for adjusting the DAAZ carburetor

Summary table of parameters of carburetors manufactured by DAAZ.

Marking of DAAZ carburetor jets (Table 1).

READ How to remove the coil from the trimmer

Marking of DAAZ carburetor jets (Table 2).

Defective or leaking needle valve

The most common reason when the needle valve is stuck open is that fuel is overflowing the carburetor . What to do in such a situation?

IMPORTANT! Sticking can be eliminated by tapping the lid lightly with a hammer. At the same time, it is necessary to check the tightness of the closure of the valve with the needle, whether there is a rubber O-ring under it. Apply vacuum to the valve to check operation.

Diagnostics of the candle channel

What to do if the fuel mixture used is in perfect order, but the gasoline trimmer still does not start? The reasons for the failure of the mechanism may lie in excessive moisture in the spark plug channel. To diagnose and fix the problem, you must do the following:

1. Unscrew the spark plug. Wipe it thoroughly and then dry it.
2. Drain excess fuel in the chamber through the appropriate spark plug hole.
3. Clean the old spark plug if there is carbon deposits on its surface. Using a regular ladies' nail file or a needle file will allow you to cope with the task.
4. When installing the element in place, set a gap of 1 mm. To check the parameter, just place any coin in the gap.
5. Reassemble the functional block.
6. Try to start the trimmer.

It is recommended to dry the spark plug channel for at least half an hour. However, in no case should you resort to calcining its elements. After all, heating the spark plug can lead to its final damage. What to do if the functional unit was serviced in accordance with the above recommendations, but the trimmer does not start, is there a spark? In this case, it is worth treating the threaded connection with gasoline. The latter does not need to be heavily soaked in fuel. It should be only slightly moistened. Such actions should be taken to ensure ignition. After all, no matter how strong a spark the candle gives, in a completely dry chamber there will simply be nothing to ignite.

Even if in this case the trimmer does not start, it is worth assessing the quality of the contact between the high-voltage wire and the spark plug. If there is no spark (even if there is a reliable connection between these elements), most likely the problem is caused by a breakdown of the ignition unit. In this situation, you will have to turn to the services of specialists who will reinstall the unit.

Trimmer device

The float carburetor consists of an aluminum body with an opening (diffuser). Air is pumped through its passage hole, and gasoline is drawn in through the fuel channels along with the air flow. This is the basis of the device - the fuel chamber. Top-mounted jets, a pump and a mixture control system ensure not only its saturation, but also a uniform supply.

For your information! Float carburetors have been used for decades, and the basic problems are similar for all types. The operating principle of the device depends on the quality of the mixture, and the setting is aimed at ensuring it.

Reliability of built-in filters

It is these devices that often become an obstacle that prevents the classic trimmer from starting. The filter provided by the manufacturers is responsible for high-quality cleaning of the air entering the carburetor. A clogged cleaning unit can lead to the fact that oxygen enters the internal compartment of the unit in smaller quantities or its supply stops altogether. You can determine if the air filter is faulty in a fairly simple and accessible way:

• Dismantle the device and carefully inspect it.
• If no blockages are detected with the naked eye, then try starting the lawn mower without a filter. This part needs to be replaced only if the trimmer starts up successfully.
• You can use a stream of compressed air to clean the air filter. But if the cleaning device has been in use for a long time, then it is more advisable to replace it.

It is worth noting that trimmers do not start due to a clogged air filter in the rarest cases. Most often, this device affects the stability of the engine. A more real reason lies in a clogged fuel filter. This unit is located in the unit tank. If the trimmer has been used for more than two years, then it is imperative to check the filter, which may impede the flow of fuel to the carburetor.

If the user is sure that the main problem lies in the fuel cleaning element, then the following steps must be performed:

• Carefully remove the filter.
• Try to start the lawn mower.

If the device starts up quickly enough, then the problem lies in the fuel filter.

The service life of this unit can be significantly reduced by long-term storage of fuel in the tool’s engaged tank, as well as by accidental entry of small debris and dust into the trimmer’s tank. But if the filter is working properly and the lawn mower still won’t start, then you need to check the fuel hose. Situations often occur when the hose together with the filter are disconnected from the main pipe, which inevitably leads to the inability to start the engine.

How to adjust the trimmer on a brush cutter

Most modules have adjustment screws, and the diagram usually helps to understand their functionality:

• L - for low-speed fuel supply;
• H - fuel supply at high speeds and its consumption;
• T - debugging idle speed.

Adjusting a brush cutter made in China can be difficult due to the presence of only one screw, which is responsible for idle speed.

Important! The answer to the question of how to adjust the carburetor Champion lawn mower is better to watch in a video where a professional does it.

Where to start diagnosing a lawn mower

If the lawn mower does not start or stalls immediately after starting, it is necessary to sequentially check all the main components and assemblies. The verification algorithm is as follows:

• Fuel tank (fuel quality);
• Candle and candle channel;
• Air filter;
• Fuel filter;
• Breather;
• Exhaust channel.

These nodes are most often the source of the main problems, which can be eliminated after a thorough inspection.

Checking the fuel mixture

Before starting the gasoline scythe engine, check the availability and quality of the fuel mixture. Don’t save money, don’t be greedy, and don’t be “clever” in this matter. Repairing or replacing the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). The oil-fuel mixture must be prepared strictly according to the instructions. Calculate its quantity based on real needs. The excess gasoline remaining after work loses its quality over time.

We diagnose the spark plug and spark plug channel

If the quality of the fuel mixture is not in doubt, and the lawn mower stalls when starting, then the cause may be a flooded spark plug. Here, a regular spark plug wrench (surely every motorist has one) and a spare spark plug are suitable for repairs.

• We unscrew the candle and wipe it;
• Dry it thoroughly (do not heat it);
• We drain the excess fuel in the chamber through the spark plug hole and dry it;
• We clean the old candle from carbon deposits using a file or a lady’s nail file;
• We set the gap with a distance of 1 mm (you can check it with any coin);
• We return everything to its place and try to start the trimmer.

You need to dry the canal for at least 30–40 minutes. Otherwise, there is a risk of re-filling a new spark plug.

If the spark plug is working, the socket where it is located is completely dry, and the lawn mower does not want to start, lubricate the threaded connection with gasoline. It should be slightly moist. No matter how wonderful a spark a candle produces, there is simply nothing to light up in a dry chamber.

If the trimmer engine still does not start, a reason such as lack of spark due to poor contact between the spark plugs and the high-voltage wire should be excluded. If the connection is good, but there is still no spark, most likely your ignition unit has failed. Here you won’t be able to do without a specialist, since the part is not repaired, but sold as a single unit.

Diagnostics of lawn mower filters

Another reason why a gas scythe stalls may be the air filter. To eliminate this, try removing the filter and starting the trimmer without it. If it works out, then you will have to change the air filter to a new one, or at least blow out and thoroughly clean the old one.

A gasoline trimmer may not start due to contamination of the fuel filter. This is the next stage 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 a filter; this is prohibited by any operating instructions. Haste can result in repair of the engine piston group.

Breather and exhaust channel

Often, “delicate” branded models of lawn mowers do not start and stall due to contamination of the breather. The main function of this element is to equalize the pressure in the gas tank. When this unit becomes clogged, a vacuum is created in the tank, preventing the supply of fuel. The problem can be resolved by cleaning the breather. You can use a regular needle for cleaning.

The normal operation of scythes with internal combustion engines may be disrupted due to dirt getting into the exhaust channel or clogging of the muffler mesh. This problem occurs on older generation models. The issue can be resolved by traditional cleaning and removal of the anti-spark mesh.

Common carburetor malfunctions

Trimmer carburetor breakdowns occur due to the use of poor quality gasoline, a damaged air filter, and the accumulation of dirt in the chamber of this unit. Most often, it is quite possible to repair a carburetor yourself. Listed below are typical problems with the carburetor of a brush cutter.

Fuel pump problems

A common malfunction that “haunts” the fuel pump is deformation of the pump membrane. For this reason, it does not seal properly and the pump channels do not seal.

The reasons for membrane deformation may be the following:

• long-term trimmer operation;
• use of unsuitable fuel;
• entry of gases into the pulse channel.

As a result, damage to the membrane reduces pump performance, and as a consequence:

• the combustible mixture becomes depleted;
• it is difficult to start the engine;
• there are interruptions in the operation of the motor;
• the piston is damaged.

Also, the above-described consequences for the engine can be caused by clogging of the pump cavity on the impulse side. In this case, dirt enters the membrane through the pulse channel.

To remove the blockage, you will have to disassemble the carburetor and clean the membrane.

Strainer clogged

The strainer can become clogged when contaminated fuel enters through a fuel hose or a defective suction head. In the photo below you can see what a clean filter looks like and a dirty one (the parts are separated by a line).

To eliminate the problem, you will need to thoroughly clean and rinse the strainer. It is also recommended to blow out all the holes in the trimmer carburetor body with compressed air.

The adjustment lever is faulty

This breakdown occurs when the contact surface of the lever wears out.

Abrasion of the contact surface occurs due to the presence of abrasive particles in gasoline or due to strong vibration of the engine during operation. This defect in the adjustment lever causes problems with intake, as well as improper operation of the engine at idle.

Inlet needle wear

The inlet needle fails, usually due to the presence of abrasive particles in the fuel fluid.

As a result:

• the tightness of the inlet needle seat is disrupted;
• leakage of the flammable mixture appears;
• Engine malfunctions appear due to over-enrichment of the fuel mixture.

Also, the inlet needle may simply jam.

Sticking of the inlet needle can cause dirt in the fuel, or the device may remain idle for a long time.

Clogged adjustment cavity

If dirt accumulates in the adjustment cavity, the inlet needle cannot tightly close the hole and a lot of fuel pours into the chamber.

This causes the fuel to become over-rich and the engine starts to operate incorrectly. It is necessary to disassemble the carburetor and clean the cavity of the adjusting membrane.

Deformation of the control membrane

The membrane may be subject to deformation during prolonged operation of the unit and when using aggressive fuel.

The impossibility of normal adjustment due to a defect leads to:

• piston damage;
• difficulty starting;
• fuel depletion;
• improper engine operation.

Intake control lever problem

This problem can occur if the adjustment lever is not installed correctly or if it is bent before installation. As a result, the contact surface takes an incorrect position, which disrupts the additional fuel supply.

Damper wear

The throttle and choke valves mostly wear out due to abrasive particles in the air. Defective dampers look as if they have been sandblasted.

As a result of wear on the valves, engine performance decreases, malfunctions appear in its operation, and the piston rings, piston and cylinder coating wear out.

Worn throttle and choke shaft

The air and throttle valve shaft may wear out due to the following reasons:

• insufficient and improper maintenance of the air filter;
• the air filter is damaged;
• The air filter is not suitable for this unit.

Due to the entry of poorly purified air, the shaft wears out and may break. Broken shaft parts can enter the combustion chamber or crankcase and cause serious damage to the entire piston system.

To eliminate problems with air purification, it is necessary to replace the defective filter or rinse the existing (functional) one. The filter must be washed in soapy water and dried.

Recommendations for use

The stability of the operation of any lawn mower and the absence of problems with starting the power unit of such devices directly depend on the conditions in which the tool is used and the quality of maintenance. And we are talking about the following basic rules:

• during operation it is necessary to pay special attention to the cooling system and other elements; It is strongly recommended to promptly and efficiently clean the channels located on the body of the scythe and the starter ribs;
• in the process of processing various elements, you can use solvents, gasoline, kerosene and other effective means;
• the specified work should be carried out after the power unit has completely cooled down;
• it is necessary to fully comply with all the rules specified in the relevant instructions drawn up by the developers of the described tool, which will avoid overloads in a warm engine, which in turn is the most common cause of serious breakdowns;
• all remaining fuel in the internal combustion engine should be completely drained before long breaks in the operation of the scythe; It is worth considering that the gasoline-oil mixture quite quickly breaks down into so-called heavy fractions, which inevitably clog the carburetor;
• after removing the fuel, you need to start the engine and let it run at idle until it stalls; in this way, the remaining mixture will be completely eliminated from the internal combustion engine.

Particular attention must be paid to preparing the instrument for long-term seasonal storage. This should be done in order to minimize the risk of problems with starting the engine. Proper preparation includes the following manipulations:

• completely disassemble the trimmer ;
• thoroughly rinse and clean all accessible elements;
• inspect the parts of the lawn mower in order to identify defects (mechanical damage detected in this case should be eliminated);
• pour engine oil into the gearbox;
• carry out high-quality cleaning of the air filter element from clogging;
• Having the appropriate knowledge and practical skills, you can perform partial disassembly of the power plant, followed by purging and lubrication of the moving elements;
• wrap the assembled gasoline scythe with a pre-oiled rag.

In addition to everything already listed, it is necessary to lubricate the piston group. This algorithm provides the following simple manipulations:

• remove the candle;
• use the starter to move the piston to top dead center (TDC);
• pour a small amount of engine oil into the cylinder;
• Turn the crankshaft several times.

Regardless of the cost and brand of equipment, you should strictly follow all the requirements of the relevant instructions and adhere to the recommendations of the developers and experienced specialists. Today, detailed information regarding the correct use of such equipment can be easily found on many specialized websites and forums.

It is important to remember that proper operation of the lawn mower and its timely maintenance (either independently or in service) is the key to the longest possible service life and minimal costs.

Next, watch a video on how to identify and eliminate the reason why a gasoline trimmer .

Sources:

https://stroy-podskazka.ru/trimmery/ne-zavoditsya-benzinovyj/

More complex reasons for lawn mower failure

If the step-by-step troubleshooting algorithm does not produce results, and your scythe still does not start or stalls, it is worth inspecting the carburetor and the engine itself. A clogged carburetor can be one of the reasons for unstable operation of the tool. There are three main problems here:

• Clogged channels or jets. All this is cleaned with special washes or blown with a powerful jet of compressed air from a compressor. Do not use needles or wire, as the bores may be damaged;
• Worn carburetor gasket. The solution is to replace the failed gasket;
• Violation of tightness. To check this indicator, you can use a regular household tonometer, replacing the pressure gauge with a suitable one. Keep an eye on the readings: if they do not change, everything is fine, but if the pressure starts to drop, it means that some part of the carburetor is faulty. You'll have to find it and replace it with a new one.

If everything is in order with the carburetor, then the gasoline trimmer may not start due to wear on the piston group. If chips, scratches or burrs are found on the piston or cylinder, they should be replaced. Piston rings must be checked. A slight luffing of the piston when the connecting rod swings indicates that it is time to change the rings. This procedure is best left to the service center specialists.