Adjustment of the carburetor of a gasoline trimmer for Brait grass.

Device and adjustment of the carburetor on benzocos and trimmers

Stable and effective work of the household trimmer for grass largely depends on the quality of the fuel operator used by it. The refueling fuel mixture should be enriched with air. for this, a built.in carburetor is responsible in the basic device. This node is one of the main elements of a braid for grass, so the operator must constantly monitor its serviceability and settings. Otherwise, the trimmer for the grass will lose its performance and may completely fail.

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.

adjustment, carburetor, gasoline, trimmer, grass

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.

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.

The main problems and malfunctions of the carburetor.

Mesh filter. There are only two problems with this element more often:

In order to find out the cause of the breakdown, the fuel filter lid is unscrewed to extract the mesh filter. If dirt just accumulated on it, then flushing in gasoline or purging will help.

With visible damage on the mesh filter, you must definitely put a new. There may also be damage to the fuel supply pipe (during the repair they practice checking this element).

The starting device of the carburetor in most cases does not function due to blockages. Should be used for flushing acetone or the same gasoline.

Purging parts of a carburetor with click of compressed air. permissible and convenient repair practice.

The hull of throttles, the ligaments of the parts of the carburetor, the intake or graduation pipeline. all of the listed parts are subject to depressurization. You can probably check in a primitive way. spread the problem area with soap foam.

Causes of carburetor breakdowns

When operating, motorcycles (for example, “Patriot” or “Union”) can be damaged, and the user will need to repair it on its own or with the involvement of specialists. This can happen for a number of reasons. One of the most common is non.compliance with the rules for using the device. If, with prolonged operation of the trimmer for the grass, the carburetor was not used and adjusted, the device breaks.

Another cause of the breakdown is an incorrectly prepared fuel mixture. Often the owners of the equipment buy oil and prepare fuel according to the recommendations written on the package of combustible materials, which is incorrect. When preparing fuel, you need to consider the instructions for the operation of the Motokos itself. In addition, the mixture “by eye” should not be made, since incorrect proportions also lead to breakdown of technology.

Important! Incorrect operation of the lawn mower can be observed when using a combustible unsatisfactory quality, damaged and/or clogged filter of thin cleaning. as well as either the formation of dirt in the carburetor chamber.

Most of the breakdowns of carburetors are equally characteristic of motorcycles of different brands, whether Echo, “cedar”, Homelite or the device of another manufacturer.

The main problems and malfunctions of the carburetor.

Mesh filter. There are only two problems with this element more often:

In order to find out the cause of the breakdown, the fuel filter lid is unscrewed to extract the mesh filter. If dirt just accumulated on it, then flushing in gasoline or purging will help.

With visible damage on the mesh filter, you must definitely put a new. There may also be damage to the fuel supply pipe (during the repair they practice checking this element).

The starting device of the carburetor in most cases does not function due to blockages. Should be used for flushing acetone or the same gasoline.

Purging parts of a carburetor with click of compressed air. permissible and convenient repair practice.

The hull of throttles, the ligaments of the parts of the carburetor, the intake or graduation pipeline. all of the listed parts are subject to depressurization. You can probably check in a primitive way. spread the problem area with soap foam.

Holocaulid setting trimmer for grass

Carburetor settings

The screw “t” (“at”) serves as a limiter of the reciprocating movement of the fuel damper and when it is twisted, an increase in engine speeds, and turning away leads to a decrease in the frequency of rotation of the crankshaft. Professionals advise setting up the loop of the lawn mower so that the ICE worked a little accelerated at minimum speed, but the head with a fishing line or knife remains motionless. If, after the manipulations of the trimmer for the grass, it is difficult to start “on the cold”, then it is enough to tighten the “T” screw for a quarter of turn and try to run the engine again.

Carburetor adjustment

Before adjusting the carburetor, rinse the air filter. It is recommended to rinse it after every 10 hours of work. After that, you can proceed to adjustment. The photo shows a carburetor of a gasoline trimmer for PRorab-8406 gasoline. The numbers indicate the adjusting screws that we will use.

Adjusting screws of a carburetor of a gasoline trimmer for PRorab-8406 grass

Make a lawn mower and wait until it warms up.

Fuel supply adjustment

Start slowly wrap the screw for supplying the fuel mixture until the moment the engine starts to stall or until it stalls if you do not have time to catch the moment. After that, unscrew the screw for a quarter of turning if the engine has not stalled, or half a turn, if stalled. Get a stalled engine. Check, opening the throttle, as the engine is gaining momentum. Continue to turn off the screw for a quarter of turning until the engine during the frying begins to confidently gain increased speeds. This will be the moment of the most economical stable engine operation. In the gasoline trimmer for PRoraB-8406 grass, adjusting screws are wrapped clockwise, unscrewed-against, in some other brands there may be the other way around.

Cooper adjustment

We start adjusting small revolutions. The screw limits the return movement of the throttle lever. wrapping it, we increase idle speed, unscrewing it. reduce. Adjust so that the engine works confidently at low speeds and even a little accelerated (for better starting), but so that the coil with a fishing line or a knife does not rotate, and before the start of their rotation there is a sufficient supply of revolutions. If the engine is poorly starting, still increase the speed at idle.

Limiting maximum revolutions

After adjusting the supply of the fuel mixture and small revolutions, check how the engine of the lawn mower will work at maximum speeds. If necessary, limit the maximum speed to the required level using a hollow screw, weaken the fixing nut and screw the screw to reduce maximum revolutions or turn off to increase. After adjustment, tighten the nut. Setting maximum revolutions is necessary to protect the engine of the trimmer for grass from overheating and the ability to use the launch key lock to reduce the tire of the right hand.

In the future, it may be necessary to adjust the carburetor of a trimmer for grass. For example, if the engine when working at full load begins to gain speed poorly, unscrew the screw by another quarter turnover. In case of difficulty starting, increase idle speed. Both weather conditions and the quality of the fuel mixture can influence work. From vibration, the adjusting screws themselves can be cream.

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:

Principle of operation

The flow of air entering the tube with a throttle fabric intensifies or weakens depending on its position. From the fuel chamber, gasoline enters a special tube through a jetler. Float. a device that regulates the supply of fuel, its level determines the volume. Gasoline supplied through a jickler, under the influence of the pressure difference, is mixed with air. So it turns out a fuel mixture for engine operation.

note! The wrong fuel composition is due to a lack of gasoline or air. This means that you need to configure the throttle or the fusion position. The motor can stall due to the jet, but this is a more serious breakdown.

Adjusting the carburetor of the lawn mower

Carburetor adjustment

Before adjusting the carburetor, rinse the air filter. It is recommended to rinse it after every 10 hours of work. After that, you can proceed to adjustment. The photo shows a carburetor of a gasoline trimmer for PRorab-8406 gasoline. The numbers indicate the adjusting screws that we will use.

Adjusting screws of a carburetor of a gasoline trimmer for PRorab-8406 grass

adjustment, carburetor, gasoline, trimmer, grass

Make a lawn mower and wait until it warms up.

Check, opening the throttle, as the engine is gaining momentum. Continue to turn off the screw for a quarter of turning until the engine during the frying begins to confidently gain increased speeds. This will be the moment of the most economical stable engine operation. In the gasoline trimmer for PRoraB-8406 grass, adjusting screws are wrapped clockwise, unscrewed-against, in some other brands there may be the other way around.

We start adjusting small revolutions. The screw limits the return movement of the throttle lever. wrapping it, we increase idle speed, unscrewing it. reduce. Adjust so that the engine works confidently at low speeds and even a little accelerated (for better starting), but so that the coil with a fishing line or a knife does not rotate, and before the start of their rotation there is a sufficient supply of revolutions. If the engine is poorly starting, still increase the speed at idle.

After adjusting the supply of the fuel mixture and small revolutions, check how the engine of the lawn mower will work at maximum speeds. If necessary, limit the maximum speed to the required level using a hollow screw, weaken the fixing nut and screw the screw to reduce maximum revolutions or turn off to increase.

In the future, it may be necessary to adjust the carburetor of a trimmer for grass. For example, if the engine when working at full load begins to gain speed poorly, unscrew the screw by another quarter turnover. In case of difficulty starting, increase idle speed. Both weather conditions and the quality of the fuel mixture can influence work. From vibration, the adjusting screws themselves can be cream.

DIY diagnostics and adjustment with your own hands can take only a few minutes.

To do everything right, run the motor. Your actions are as follows.

  • Find limit speed at idle. To do this, unscrew the screw l to the right, and then to the left. Turning step. a quarter of turning counterclockwise.
  • Using the screw t, you can configure the idle speed of the motor: increasing when rotating the screw clockwise, decrease. on the contrary. The adjusted engine confidently works without load and without warming up. Heated. does not overestimate the moment.
  • If you set up not a motorcycle, but a trimmer for grass, then the rotor of the screw t sets a greater margin of turnover per minute. For devices of both types, stable turns are set when choosing a mowing height with a knife (or fishing line).
  • The last rotate the screw h. He sets the rate of supply of gasoline with air at maximum speed, engine power, motor heating temperature and fuel consumption.

We offer to familiarize yourself with nolina pruning to configure the motor from the screw h, make the following.

Open the throttle and squeeze the gas at maximum speeds. Twist the screw h clockwise until the engine speeds are reduced. Twist slowly the same screw counterclockwise until the engine gives out unstable speeds. Take the screw back a little (clockwise) until the engine earns smoothly

It is important to catch this line. The result of the exact adjustment is the complete combustion of fuel and the white-brownish color of the spark plug

The candle flooded with gasoline is much darker than the unbearable

The result of the exact adjustment is the complete combustion of fuel and the white-brownish color of the spark plug. The candle flooded with gasoline is much darker than the unbearable.

How to adjust the carburetor of the lawn mower, see further.

The spring may interfere

My first attempt to adjust the gas mowing carburetor did not give anything, since the spring of the fuel mixture adjustment propeller prevented. The factory spring turned out to be too thick in a compressed state and did not make it possible to reduce the supply of fuel to the required level. I had to choose another spring and continue the adjustment after its replacement.

The adjusting screw for feeding the fuel mixture with the spring

In the photo above the factory spring, below the adjusting screw with a selected spring. I am writing about this, because I am not sure that this is an isolated case, and someone else may face the same situation.

Carburetor adjustment

Before adjusting the carburetor, rinse the air filter. It is recommended to rinse every 10 hours of work. After that, you can start setting up. The photo shows the carburetor of the gasoline bush zerab-8406. The numbers indicate the adjusting screws that we will use.

Adjusting screws of the carburetor of a gasoline trimmer for the grass of the germino-8406

Run the gas cutting and wait until it heats up.

Fuel supply adjustment

Slowly start turning the fuel mixture adjustment screw until the engine starts to stall or stops if you do not have time to catch the moment. Then unscrew the screw for a quarter of turning if the engine does not stop, or half a turn, if it stalled. Launches the engine in the gloss state. Check, opening the throttle when the engine is gaining momentum. Continue unscrew the screw N. 1 quarter turnover until the engine begins to stably accelerate when gas supply. This will be the time of the most economical stable engine operation. In a gasoline trimmer for PRoraB-8406 grass, adjusting screws turn clockwise, unscrewed. counterclockwise, some other brands have a gasoline trimmer for grass on the contrary.

Cooper adjustment

Let’s start setting low speed. The screw limits the reverse movement of the accelerator lever: turning it, we increase the idle stroke, unscrewing. Reduce. Adjust the engine so that the engine confidently works at low speeds and even with a small throttle (for better starting), but so that the coil with the wire or the knife does not rotate, and that there is a sufficient supply of revolutions before they start to rotate. If the engine does not start, increase the idle speed further.

Limiting maximum revolutions

After adjusting the fuel mixture and low speed, check how the gasoline cutter engine will work at full speed. If necessary, limit the maximum speed to the required level using no. 3. Loosen the fixing nut and tighten the screw to reduce the maximum speed, or unscrew it to increase it. After adjustment, tighten the nut. Installation of the maximum speed is necessary to protect the engine of the trimmer for grass from overheating and in order to be able to use the castle of the ignition key to reduce the fatigue of the right hand.

In the future, an additional adjustment of the carburetor of the trimmer for grass may be required. For example, if the engine starts to work poorly when working with full load, weaken the screw 1 for another quarter turnover. If the launch is difficult, increase idle speed. Both weather conditions and the quality of the fuel mixture can affect the work of gasoline law mmores. Vibration can lead to the turn of the adjusting screws themselves.

Carb Adjustment on a String Trimmer

The spring may interfere

My first attempt to adjust the carburetor of Kustoreza failed, as the spring of the fuel mixture adjustment propeller interfered. The factory spring in a compressed state was too thick and did not allow to reduce the supply of fuel to the required level. I had to take another spring and, after replacing, continue adjustment.

Fuel mixture adjusting screw spring

In the photo above the factory spring, below the adjusting screw with a selected spring. I write about this because I am not sure that this is an isolated case, and someone else may face the same situation.

How the gas mowing carburetor works or the principle of functioning

The adjustment of the carburetor of the Chinese lawn mower is completely identical with the setting of travokosylovs of European, and manufacturers. To cope with the task of adjusting the carburetor on benzocos and benzotrimers, you need to understand the principle of their functioning. How the carburetor works on a benzos, step.by.step and available described below.

  • The operation of the carburetor of the lawn mower begins with the supply of fuel through the channel, as shown in the diagram
  • The absorption of fuel into the carburetor occurs using a pulse channel connected to the engine card. Due to the vacuum of air, a flexible membrane is moved under the number 4 in the diagram above
  • Through valves 3 and 5, fuel supply occurs. The valve 3 is inlet, due to which the fuel is supplied to the sub.sector, and the valve 5. the exhaust
  • Further, the fuel moves through the channel and, passing the filter of thin cleaning, reaches the needle valve 14
  • The needle valve is connected by means of a lever with the control membrane 18
  • The needle valve is driven when exposed to the membrane. When it is necessary to pump up the fuel to start the engine, it is necessary to affect the soft cover of the manual pump. When exposed, the needle is opened, and the camera is filled with the fuel mixture
  • Когда же двигатель запускается (на холодную), то открытие иглы происходит за счет разрежения при закрытой воздушной заслонке. This vacuum affects the nozzle nozzles and high speeds on the membrane 18
  • The membrane acts through the lever on the needle valve, through which the camera is filled
  • After starting the motor, the air damper opens, as a result of which the engine operates on the depleted mixture, since the fuel is mixed with air
  • The fuel mixture with a filled chamber is supplied (sucked) through the nozzle jetlays and medium revolutions (when the engine is launched)
  • The throttle shift at the same time shifts from the original position by 10-15 degrees
  • When the work is carried out under load, then the fuel begins to enter the chamber through a nozzle nozzle, and at the same time the throttle shift turns to an angle up to 90 degrees (depends on the force of pressing for gas). In all operating modes, an air damper should be open, through which the fuel is mixed with air, and thereby there is an ignition of the mixture in the cylinder

The following shows the principle of operation of the carburetor of the lawn mower. Based on the scheme, you can not only deal with the principle of operation, but also identify breakdowns and other malfunctions of the mechanism.

When operating the tool, it is necessary to take into account the presence of another nozzle. This nozzle is located between the channels of the idle and full power. It is necessary in order to exclude a strong impoverishment of the mixture, which occurs in the case of the engine at an incomplete load. In such a situation, the occurrence of a back of a pair is not excluded. Through the additional channel (nozzle), fuel is sucked into the chamber, through which the fuel-air mixture is enriched. Below is an additional nozzle, which is indicated by the number 1.

Having an idea of ​​the design of the membrane carburetor of Motokosa and the principle of work, it will not be difficult to configure it with your own hands. To adjust the carburetor of the lawn mower, adjusting screws are used. The scheme above shows two screws for configuration, but most modern models of gasoline trimmers are equipped with three screws. The presence of three setting screws allows you to perform a more accurate adjustment, while achieving stable and uninterrupted operation of the internal combustion engine.

It is interesting! What is the difference between a trimmer and a benzoca? Many people believe that a trimmer for grass is low.power electrical herb. However, a trimmer for grass is a generalized name for benzos, motorcycle and electric braids, as they are designed for general purposes.

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.

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.

How To Adjust Or Tune The Carburetor On A Weedeater (Step-by-Step)

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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