A trimmer carburetor device for gasoline grass

Motokosa carburetor adjustment is a process that needs to be mastered for the full operation of a trimmer for grass. Trimmer for grass is a completely simple device that can break in only a few places and demand a mechanical repair or replacement of part. Adjustment of the carburetor device of the float.type motorcycles may require knowledge of certain subtleties. The nuances due to the model and the specifics of its functioning will ensure a clear mixing and supply regime of the fuel mixture.

CHAMPION BAS carburetor, how to adjust? This is just a trimmer for floating type grass. a common option designed to mix air and fuel in the proportions provided. The main problems arising during the operation of the motor are approximately similar to the problems that overtake the carburetor in the car:

  • the motor can stall immediately after it managed to start. The reason is that gasoline is supplied in insufficient quantities. This is called “poor” fuel;
  • Excessively fed gasoline leads to its incomplete combustion, excessive density of the mixture and uneconomous consumption.

Repair of the carburetor

Important! It is necessary to regulate the carburetor under different circumstances: a change in the temperature regime, octane fuel or type of oil, after winter or end of the run.in, load or spontaneous turning of the screws from strong vibration of the body. Some owners prefer to configure the module before each use to make sure of its correct work.

The main problems

Malfunctions of the carburetor Motokos or trimmer for grass, despite the relative simplicity of their elimination, sometimes require a long search by excluding. The main reasons are as follows:

The most repeating breakdown is wear, rupture of the membrane. As a result, its lavation. Fuel moves are not sealed at certain stages of the engine cycle. The reasons here are as follows:

  • You have been working on a motorcycle or trimmer for too long without a break;
  • Poor.quality fuel was seasoned;
  • Wheelled gases fall into the pulse channel.

A deformed membrane is fraught with several bad consequences:

  • not enough gasoline or oxygen in the created combustible mixture;
  • the launch of the motor occurs after 10 or more unsuccessful attempts;
  • the engine knocks, clats during operation, and t. D.;
  • The working piston is deformed.

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The reasons for the clogging of the mesh filter are poor.quality fuel cleaning, damage to the hose and/or the injection head.

Wear of the contact edge of the lever. a consequence of not completely purified fuel, into which grains of sand or particles of clay, metal or other inclusions that are not soluble in liquid hydrocarbons fell. A problem with fuel injection appears, the motor does not function with interruptions without load.

The inlet needle breaks due to the presence of metal and stone particles in gasoline. As a result, the saddle of the intake needle tightly adjacent to it, the fuel mixture flows. In the combustible mixture created by the carburetor, there is too much air, which is why the motor can “sneeze” during operation. Finally, the needle can stop due to poor-quality gasoline, or the unit was idle for a long time.

Deposits may accumulate in the adjustment compartment. The needle does not completely cover the hole, and a lot of gasoline enters the fuel chamber. the motor pours it, perhaps floods the spark plugs. Because of this, the gasoline mixture contains an increased number of vapor of gasoline. The efficiency falls noticeably.

The membrane is often deformed (sometimes torn) due to continuous operation of motorcycles or trimmer for grass for several hours. If you abuse such a “shock” mode of operation, damage to the membrane occurs more often. New breakdowns will be sprinkled from a cornation of abundance:

  • the piston will break;
  • The number of attempts by the unsuccessful start of the engine will increase sharply;
  • The fuel mixture will contain too little gasoline;
  • Useful (thermal) power will drop sharply.

Sequeling of the adjusting lever. a consequence of the incorrect installation, random flexion. Contactive line will find an incorrect position. This will violate the additional injection of gasoline.

The damper has worn out

Throttle and air conditioning are unusable due to admission to the air flow of dust, metal particles, etc. D. Damaged shutters are similar to details subjected to streaming with sand. Due to wear of the damper, the efficiency of the motor decreases, breakdowns are detected. The piston and cylinder wear out.

In some cases, this filter is simply not suitable for your model motorcycles or trimmer for grass. In the end, the shaft of the motor will suffer. its pieces fall into the engine channels, which is why the piston will be broken.

The fact that the adjustment is too rough (it is not possible to accurately set the parameters) are to blame for the adjustment screws. The manufacturer Motokos or trimmer for grass can put excessively thick and hard springs. You can find others either in workshops where such equipment is repaired, or purchased from any dealer or official representative of the company who released the engine for your trimmer for grass or mechanical braid for grass.

The primer broke

Primer-a manual mini-pump for forced swinging fuel into a carburetor. For a successful start of the motor, it may be necessary to pump 20 ml of gasoline manually.

Carburetor for a trimmer for grass. How to adjust the carburetor of a trimmer for grass.

On trimmers, in addition to electric motors, gasoline internal combustion engines are installed. This mechanism requires special attention, since if it is incorrectly set up, it will either refuse to work or work with interruptions and power loss. Basically, the engine setting is to adjust the supply of fuel, and this is done using a trimmer carburetor for grass.

The standard design of any gasoline trimmer for grass must include a fuel system, the basis of which is the action of a standard carburetor. Its device and the initial principle of action are almost the same for all motos, regardless of their design characteristics and purpose.

The carburetor of the motorcycles consists of an entire.metal aluminum corps, which protects the internal components of the node from moisture, fine debris and dust. In the lower part of the case, a built.in diffuser is provided, the second name of which is “Venturi’s nozzle”. The main function of this regular part is the supply of air in the amount that is required by the fuel node to enrich the fuel. Diffusure work on a simple principle: the smaller its diameter becomes, the more intensively the air is absorbed. This is due to the fact that in the zone of the smallest diameter the level of air discharge becomes maximum.

The upper part of the built.in factory diffuser is pre.equipped with fuel tubes, according to which, under the influence of air, the fuel mixture is delayed. The remaining parts of the carburetor: regular adjusting screws and fuel pump can be located both inside and outside the carburetor.

The device of the carburetor Motokosa includes a throttle, the main task of which is to adjust the volumes of absorbed air. The larger the amount of air, the higher the rated power of the power unit of the trimmer for grass. Another damper function is to relieve the cold start of the engine. If the lawn mower is started for the first time after prolonged downtime, then the damper must be closed. Immediately after starting the motor, the part must be opened, otherwise the ICE will stall.

The carburetor for a trimmer for grass is equipped with a pulsed channel, which connects the internal cavity of the ICE crankcase with the pulse chamber of the pump. The piston located in the motor cylinder creates reciprocating movements, which leads to phased changes in pressure inside the crankcase. At the same time, a membrane is set in motion. Thus, the action of the pump is completely synchronized with the operation of the power unit.

A standard carburetor membrane takes an active part in the fuel suction. In the fuel node, it gets through the fitting. After that, the fuel passes through the built.in intake and exhaust valve, then through the mesh filter and fuel tube. Then the fuel flows next to the needle and gradually fills the camera equipped with a control membrane.

The standard valve of the carburetor trimmer for the grass is connected to the membrane using a lever. Below the built.in membrane is a cavity into which the air is absorbed through a special hole.

The carburetor for the lawn mower is working on this principle in stages. This ensures the continuous operation of the fuel unit and the uninterrupted supply of fuel in the cylinder of the standard power unit.

carburetor, motokos, partner, adjustment, need

Когда требуется настройка карбюратора бытового триммера для травы? It is necessary to adjust the built.in carburetor of a trimmer for grass with:

  • running a new engine, during which from 4 to 5 liters of fuel mixture were used;
  • sharp changes in the weather;
  • changes in air vacuum. for example, when a lawn mower is often used in mountainous areas;
  • prolonged simple trimmer for grass;
  • intensive growth of loads on the power unit Motokosa;
  • arbitrary twisting of the built.in adjusting screws of the carburetor. this becomes the cause of increased vibration of the internal combustion engine;
  • change in the quality of the components of the fuel mixture;
  • transfusing a fuel by a carburetor, a result of which is an increase in fuel consumption;
  • the regular appearance of the thick layer of tarry deposits and soot on the surface of the electrodes of the standard spark plug of the trimmer for grass;
  • starting the engine and its arbitrary shutdown or slow speed;
  • lack of fuel intake into the cylinder of the power unit;
  • increase in the volumes of ejected gases.

The lack of timely tuning of the carburetor threatens the serious breakdown of the trimmer for the grass, up to the full failure of its factory engine.

Do.it.yourself carburetor adjustment. Periodic adjustment of the carburetor of the trimmer for grass should be performed on the served and completely serviceable power unit. Before starting the procedure, the operator must thoroughly rinse the details of the internal combustion engine and inspect its CPG for the presence of burrs or other defects. In addition, you will need to clean or change the spark plug, as well as rinse the filter elements in the design of motorcycles.

During the tuning of the carburetor, the engine of the lawn mower should operate under a certain load. It is best to install a cord of the corresponding diameter or cutting knives on a trimmer for grass.

After the installation of the cutting organs, the operator must start the ICE of the trimmer for the grass and leave it to work for about 10 minutes. If during the operation of the power unit at idle, it was noticed that the cord or knife rotates, then it is necessary to reduce the speed created by the engine. To do this, turn the lower regulator, often indicated by the letter “t”, to the left side, until the installed cutting organ is completely stopped. The further settings of the fuel node are as follows:

  • The “l” regulator, located on the right, is responsible for the enrichment of the fuel mixture by air during the operation of the motor at low speeds. The position of this screw must be configured first. To do this, the operator will need to achieve maximum engine speed when working at idle. for this you need to alternately turn the “l” screw in the right or left side. As soon as the maximum revolutions are achieved, the screw will need to be turned to 1/2 turning to the left;
  • The screw “t” or “LA” is necessary to adjust the idle. During its turning to the left, the power unit will decline, and when turning to the right, respectively, increase;
  • The H “H”, provided on the left, is responsible for the enrichment of the fuel mixture by air during the operation of the ICE of the Trimmer for high speeds. This screw is also needed to configure the power of the motor and the volume of the consumed fuel. The setting of its position is carried out by turning the screw to the right or left sides until the maximum permissible engine speed is reached. After that, the screw “h” will need to turn 1/2 turn to the left.

Trammer device for grass

The float carburetor consists of an aluminum case with a hole (diffuser). Air injection is carried out through its passage hole, and gasoline is pulled through the fuel channels along with the air flow. This is the basis of the device. fuel chamber. The nozzle installed on top, the pump and the mixture adjustment system provide not only its saturation, but also the uniform supply.

Note! The float carburetor has been used for decades, and the main problems of all types are similar. The principle of functioning of the device depends on the quality of the mixture, and the setting is aimed at ensuring it.

Carburetor device

The lawn mower (lawn mower) contains the basis. the case of aluminum, which houses the rest of the parts, coordinated as a whole. The carburetor housing has a diffuser. a move with internal channels through which air is pumped.

The larger the cross section of the diffuser, the more actively, oxygen is supplied along with the air-an oxidizing agent in which fuel burns (gasoline mixture).

Channels branching from the course of the diffuser deliver fuel, with which the heated air is mixed, which carries away the vapors of gasoline. Outside the main compartment of the carburetor are placed:

Problem 2: Flaw clogging of thin cleaning

It is located on the cover of the carburetor and is a small metal mesh. Its pollution occurs very often. This is due to the precipitation of oil, additives, mud on it.

Step 2

Sometimes when disassembling the nets, a certain film is found. This carburetor lacks fuel and the lawn mower is either not starting or working with interruptions. The treatment methods are identical to the first reason: ultrasonic bath, compressor or spray can with a special solution. In addition, if the net is clogged thoroughly, you need to take a soft brush for watercolor paints, get wet into gasoline and rinse it carefully without damaging it.

Step 3

They have the ability to wear out during operation. From prolonged use, they are deformed, stretched, lose their elasticity, poor.quality fuel corrodes them, and can no longer perform their functions well. This also applies to the needle itself. The fact is that it is covered with a thin layer of rubber, which wear out during operation and can no longer enter the hole tightly. The lawn mower begins to work with interruptions. To eliminate such a breakdown, it is necessary to replace all worn parts. Where to get them?

In specialized stores of garden equipment, a remote control for a carburetor Motokos for a certain model is sold. The cost of such a repair set is from 40 to 60 hryvnias.

It includes two membranes, gasket, a needle valve and a spring.

carburetor, motokos, partner, adjustment, need

All fast.significant parts of the carburetor can be replaced. Therefore, you should not rush and buy a new one, and you don’t need to run to the workshop either, the repair of any user motorcycles is possible. Professionals argue that the quality of components in the remote complex even exceeds the characteristics of the native parts of the carburetor. Therefore, a qualitatively repaired node will work better than a new.

How the carburetor works

Correct adjustment is possible only if the device of the chainsaw carburetor was studied in advance and the quality of this part was checked. For example, for the Partner P350S tool, the carburetor manufacturer is Walbro. The quality indicator in this case is the marking WT-891.

Know this information is necessary to order spare parts.

Partner 371 chainsaw carburetor or any other model has a classic structure. The main elements are:

  • fuel pump;
  • main camera with a membrane;
  • throttle and air shutters;
  • screws (quality adjustment, quantity and idle adjustment).

In addition to these details, there are technological channels in the carburetor, through which a mixture of gasoline with butter moves.

The principle of operation is as follows. Impulse is supplied from the crankcase to the fuel pump. From it begins the work of the carburetor. After receiving the pulse, the fuel mixture is sent to the main chamber, entering there through a needle valve, the control of which is performed using a diaphragm. From the main chamber through the technological channels, the liquid is sent to the cylinder, while the amount of liquid can be independently adjusted using a throttle.

Additionally, the throughput of technological channels can also be adjusted. For this purpose, it is necessary to use the quality and quantity screws that work on the principle of valves.

The main malfunctions

For Partner chainsaws, the following types of malfunctions are characteristic:

  • engine disorders, for example, problems with ignition, supply of fuel or exhaust and piston-cylinder systems;
  • The failure of the carburetor nodes, for example, a coupling unit, a quapi brake or lubricant system.

Бензокоса ” Partner Colibri 25″.

The causes of the failures can be different, but most often it is improper operation, insufficient amount of oil or low.quality fuel mixture.

How to remove and disassemble

Correction of the malfunctions of the carburetor of the chainsaw is possible only after this part is removed. And for this you need to disassemble the chainsaw directly. This work will have to be performed in the following sequence:

  • Remove all nodes in strict order. First, the lid of the brake of the quapi and the saw headset, then the top cover, the saw handle and the starter.
  • After these parts are removed, it is necessary to clean the saw using a compressor with a nozzle.
  • After that, you need to plug the inlet window, since there is a risk of dirt and foreign objects inside.


You can clean the carburetor in different ways, most often they do it with air. The sequence of work is as follows:

  • Unscrew the upper bolt of the part of the part.
  • Remove valves gasket. After that, you need to blow the net with compressed air. At the same time, you need to blow not close, but at a short distance.
  • Other parts of the carburetor do not need to be removed. To clean the surface, you can use a special liquid.
  • Now the carburetor needs to be assembled, fixing the details in the reverse sequence.

Other repair work

For effective operation of the Partner chainsaw may be required other repair work. It is easy to carry out your hands with your own.

The most common problem is the absence:

  • sparks in the candle (you need to either clean the gap on the candle, or change the coil or flywheel to similar parts);
  • fuel supply (the cause may be a blockage of a hose or fuel filter);
  • air supply (it is required to flush the air filter).

How to understand that the carburetor of the lawn mower needs to be adjusted

The following signs may indicate this:

  • Difficult launch of the motor, weak speed set.
  • Increased fuel consumption.
  • The engine works unstable, the speed is often jumping.
  • There is a large amount of exhaust gases.

Find out whether the carburetor is correctly adjusted, checking the spark plug will help. First we release it from the casing, disconnect the contacts from the igniter.

Clean the candle nest with a device that pumps the air. For this purpose, a compressor with a small tube is perfect. Using a dynamometric key, we remove the candle.

After pour the sparkle with the spark plug for flushing the thread into the nest, unscrew the candle to the end after a short period of time. If the electrodes are black, then this is a dozen that is associated with poor carburetor adjustment. If she is a brick shade, then everything should be in order with a gas station.

After a long period of downtime, the tool also needs to be adjusted. For example, after winter.

It is also recommended to set up a setting when changing the composition of the fuel mixture: oil or gasoline.

How to adjust the carburetor of the lawn mower with your own hands


  • Run the motor. When it is launched on the XX, knives should not rotate, but if the opposite occurs, then we reduce the speed of the idle.
  • We adjust the screw l. He is responsible for the mixture at low speeds. First, scroll to the stop clockwise, then unscrewed 90 degrees against the sentry. If you find failures, we repeat this action, weakening it for 1/8 part, that is, 45 degrees.
  • Adjust the La screw, more frequent name. t. With an increase in speed XX, more air is added to the mixture. Power is lost. But if there is not enough air, fuel is burned worse. We unscrew the screw so that it works perfectly at low speeds, while the knives should not rotate. In the process of setting, you need to feel momentum, it should work stably on XX.
  • Adjust the screw h, which sets up the mixture at high speeds. To identify their maximum quantity, we use a tachometer. Upon reaching the largest number of engine speed, we unscrew the screw to the left by 180 degrees, the adjustment on this ended.

Sometimes only the correct setup and the use of the device reveals its entire potential. No need to neglect it and conduct as necessary.

Setting up a carburetor of a lawn mower with three adjusting screws

Before starting work, you need to place the lawn mower on a flat stable surface. Remove the chain in the opposite direction. There are motorcycles with two and three adjusting screws. Two screws most often equip the tools produced in China. Consider the adjustment of the carburetor Motokos with three screws.

Setting up a carburetor of a lawn mower with three adjusting screws

Before proceeding with the adjustment of the carburetor of the lawn mower, you need to rinse the air filter. Cleaning is carried out with water with a detergent or soap, and if necessary, a new. Often in the poor work of the carburetor, scibberries are guilty. In order to prevent the filter, it is recommended to clean the filter after every 10 hours of operation of the tool. Do not forget to check the condition of the candle, if there is a dozen, you need to clean it. Candles are consumables and have their own resource. To ensure good operation of the engine of the lawn mower, candles periodically need to be changed. Next, we evaluate how well the carburetor is fixed to the cylinder-piston group. After the preparatory manipulations are completed, you need to start the motor. Let the engine work for 5-10 minutes. Then you need to identify how many adjusting screws on your tool.

There are the following adjusting screws on the gasoline trimmer:

Fuel supply adjustment

At first you need to slowly tighten the screw adjustment screw for the fuel mixture. You need to do this until the engine starts to stall or stalls. Following this, if the engine did not stop working, you need to turn the screw for a quarter of turnover, and if it stalled, then by half the turnover. Next, you should have a stalled engine. Then you need to open the throttle and see how the speed is gaining. Turn the screw for a quarter of turnover again. You need to scroll until the engine begins to confidently gain increased speeds during cuffing. This is the right time when the engine works most economically. There are times when adjusting this screw does not give anything. Often the reason is in the factory spring that is located on this screw. This does not happen to all the tools. And if the spring turned out to be defective, then replacing it will not be difficult. A suitable spring can be purchased at any construction store.

Cooper adjustment

Following the adjustment of the fuel supply, we are accepting for the adjustment of the idle. To do this, you need to adjust the corresponding screw so that the engine works slightly accelerated at small speeds. But it is necessary to trace, for the immobility of the reel with fishing line and knives. Before the start of their movement, several revolutions should remain in stock. The movement of the coil and knives can subsequently lead to the rapid wear of the clutch. Having noticed that the engine starts poorly, you need to increase the number of revolutions at idle. With an increase in revolutions, the fuel mixture is saturated with air, which leads to power loss.

The main signs of the proper idle work:

  • Revolutions for a trimmer head;
  • Uninterrupted operation of the engine even when the position changes (sharp rise or descent of the knife);
  • Calm operation of the engine at a cold move;
  • Lack of increased speed of hot engine.

Maximum speed adjustment

Further, for the full tuning of the carburetor of the lawn mower, it is necessary to adjust the maximum speed. It will not be superfluous to look into the instrument operating manual and see the maximum speed value. This amount will help to determine the tachometer most accurately. If such a device was not at hand, we set up by ear. Barely determining the maximum speed of revolutions by ear, we begin adjustment. A screw for limiting maximum revolutions will help in this matter. Control the engine operation at maximum speed. If necessary, reduce speed, weaken the fixing nut and unscrew the screw. If the turnover is too large, then you will need to screw the screw. These actions must be done in order to protect the engine from overheating. Scroll the screw until the clear even operation of the engine is established.

After the work done, if everything is done correctly, the stable work of the tool is provided.

Understand this by the following signs:

Setting a carburetor of a lawn mower with two adjusting screws

Motokosa carburetor adjustment with two screws is much easier than described in the first version. But it is worth noting that this setting is less accurate. Before starting the setup, it is necessary to remember the factory parameters of the lawn mower. After a while, the engine starts and works for several hours. Although some tools are enough 10-15 minutes of work to set the necessary parameters.

Setting a carburetor of a lawn mower with two adjusting screws

First you need to start the engine at low speeds. If the chain moves along the tire during operation, then this is not the norm. You need to adjust the screw so that the chain stops moving.

Next, you need to switch to average speeds. Then the engine can smell. The adjustment screw will also help to eliminate this trouble. Having tightened it stronger, the fuel mixture will begin to be supplied to the engine, which is less enriched. After that, the smoke will disappear. But the speed will increase. Adjustment must be done until a smooth clear work is achieved without jerking.

After all the necessary settings are carried out, it is necessary to let the trimmer work in real conditions for more than one hour. After some time, it would be nice to check whether all the components work correctly. If deviations have been found, they need to be eliminated.

An indicator that the adjustment will be successfully non.flowing fuel combustion and a slightly brownish candle color. The color of the candle with the soil is darker.

Carburetor Carburetor Setting Motokosa is a very important preventive event, which must be carried out every time when such a need occurs. As described above, such a need can arise quite often. By the way, the reason for configuration can also be the screws promoted from vibration. In order for the tool to serve for a long time, it is necessary to always follow the instructions for the operation of the lawn mower, use the correct fuel mixture.

The principle of operation of the carburetor of the lawn mower

The throttle dashes determines the amount of air for supply, and the engine power directly depends on this.

Fuel is sucked into the carburetor system (its membrane). Then passes through the fitting in the carburetor. Next, the liquid moves through the intake and exhaust valve of the pump. Filtered with a net. The needle valve moves into the membrane chamber.

  • Air supply to the tube with an air septum (damper). The partition regulates the intensity of the air flow.
  • The fuel supply system is necessarily narrowed by a diffuser to increase the flow rate.
  • Gasoline through the float chamber and nozzle with narrowing. The chamber with a float regulates the temporary volume of gasoline. In the float chamber, the pressure level is neutral, and in the tube with narrowing is already low. Thanks to the pressure drop, fuel penetrates through the jetler.
  • Air flow acceleration contributes to the transfer of fuel (gasoline) and its spray. As a result, the air-fuel mixture of the necessary proportion or density is formed.
  • The air-fuel mixture penetrates the engine cylinder through the fuel tube.

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

Simply put, adjusting the carburetor on a benzocos. creating an optimal fuel mixture due to the correct air supply.

How to adjust a carburetor on a gas tank

Before adjustment, it is necessary to carefully clean the filters according to the maintenance in the instructions.

Further configuration of the carburetor of the lawn mower with your own hands is performed by adjusting screws. There are three of them:

Right (l). adjustment of the fuel mixture for low revolutions.

You need to find the maximum speed at idle. To do this, they slowly turn the screw (l) to the right and left.

For adjustment, the screw is rotated by a quarter of turning must be counterclockwise.

Lower (t). is responsible for adjusting the engine at idle.

For proper adjustment of the idle, it is characteristic:

  • Sustainable operation of a cold engine;
  • non.high speed of the hot engine;
  • for a trimmer head, a large supply supply;
  • Sustainable engine operation when changing positions (sharp rise or descent of a knife).

Left (H). adjusting the mixture at high speeds. (The screw is set up last).

The overall adjustment of the maximum revolutions, engine power, temperature and gas consumption depends on the left screw (H).

Setting a carburetor of a lawn mower with a last screw is performed as follows:

  • Open the throttle to the full, while issuing a full gas. Turn the screw clock until the speeds fall (in this case, they are oriented by ear).
  • Turn the screw as slowly against the clock until the non.uneven operation of the engine.
  • Then turn back very little, barely hearing a stable, even work.
  • For more visual use of skills, it is more convenient to consider the work of an experienced user:

It is interesting that from the point of view of the author of the video, the configuration (its correctness) is determined by the color of the candle, and not just by the speed and stability of the engine.

Correct tuning of the carburetor with your own hands in this case-combustion of the fuel mixture without a residue, the color of the candle should be light brown.

Motokosa carburetor adjustment in practice. video

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Hi! You have a great article, but in general the site is very curious and cognitive. I wish you good luck and prosperity in your business. I studied a lot of time car subject. Good luck)))

Interested in setting up the carburetor of the benzotrimmer

Daewoo Dabc 280. As I bought a mowing normally, but then the problems gradually began. Started normally, but after warming up the gas was hardly promoted, and then generally after pressing the gas button began to stall. The filter is normal, the tubes are new, it also does not suck in the air anywhere, gasoline flooded fresh. I tried to twist the screws L and H, it helps for a while, then it starts to stall when you press the gas. The nozzles counted about 1.5 turnover. All gaskets seem to be intact, the filter mesh in the carburetor is clean. What else to see, what to look for?

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