Adjusting the Carburetor Gas Cutters You Can Do It Yourself

DIY gas trimmer repair

Gas scythes, like all gasoline powered tools for the garden, are not difficult to maintain. Dismantling the brushcutter motor calm. It is possible and necessary to repair, configure without the help of others. For example, do-it-yourself carburetor adjustment of the brushcutter is a matter of 5 minutes.

A brush cutter carburetor is a node in the power system. Carburetor adjustment In it, like all carburetors, there is a process of mixing air and fuel (gasoline) for the upcoming supply to the engine cylinders.

The main thing in this process is the correct proportion of fuel and air, which is why the carburetor is regulated.

In order to find out the cause of the breakdown, the fuel filter cover is unscrewed to remove the strainer. Carburetor tuning If dirt has simply accumulated on it, washing with gasoline or blowing will help.

With visible damage to the strainer, it is imperative to install a new one. There may also be damage on the fuel supply pipe (during repair, check this element).

Adjusting the Carburetor Gas Cutters You Can Do It Yourself

The carburetor starter in most cases does not function due to blockages. Cleaning the carburetor of the briggs stratton mower. Use acetone or the same gasoline for flushing.

Blowing off carburetor parts with a blockage of compressed air is an acceptable and convenient repair practice.

The throttle body, the bundles of carburetor parts, the intake or exhaust pipe. all of these parts are subject to depressurization. You can probably check it in a primitive way. smear the problem area with soap suds.

Gas scythes, like all gasoline powered tools for the garden, are not difficult to maintain. It is possible and necessary to repair, configure yourself. For example, do-it-yourself carburetor adjustment of the brushcutter is a matter of five minutes.

A brush cutter carburetor is a node in the power system. In it, like any carburetors, there is a process of mixing air and fuel (gasoline) for further supply to the engine cylinders.

In this process, the main thing is the correct proportion of fuel and air, for which they regulate the carburetor.

In order to find out the cause of the breakdown, the fuel filter cover is unscrewed to remove the strainer. If dirt has simply accumulated on it, washing with gasoline or blowing will help.

The carburetor starter in most cases does not function due to blockages. Use acetone or the same gasoline for flushing.

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  • Joylandi 16-Apr, 2016
  • cleaning the carburetor to trim the cleaning of the carburetor to the petrol blower blowing the carburetor how to clean the carburetor to BT how to clean the carburetor to petrol cutting the carburetor to petrol cutting

Benzokosa is one of the main tools of the summer resident, used to quickly put the land in order. Owners of private houses also purchase this tool for mowing grass on personal territory.

The period of active use of benzokos and electric trimmers falls on the summer period. Before starting operation, the tool is brought into working condition: friction parts are lubricated, the cutting set is changed, and the fuel mixture is poured into the tank.

If the engine does not start at all or stalls quickly without gaining enough speed, you have to look for the causes of the malfunctions and eliminate the identified malfunctions. To carry out the repair of the brushcutters with your own hands, you need to understand its structure and the principle of operation of the main components.

This information can be found in the instruction manual, which the manufacturer applies to the garden equipment without fail. Check for such a guide when buying a chainsaw. The imported instrument must be accompanied by instructions written in Russian.

The cutting headset is attached to the brushcutters:

  • The line, the thickness of which varies from 1.6 to 3 mm, is located in the trimmer head. When mowing grass, the line is subject to wear. Replacing a fishing line is done quickly and easily in two ways: by winding a fishing line of the same diameter onto a bobbin or by installing a new reel with an already wound fishing line.
  • Steel knives with double-sided sharpening to a brushcutter to clean the site of weeds, small bushes, hard grass. Knives vary in shape and number of cutting surfaces.

On the U-shaped, D-shaped or T-shaped handle attached to the bar, levers of control of the brushcutter are located. The cutting mechanism is fenced with a special casing. Refueling household Lawn Mower mix made from gasoline and oil, which is poured into the fuel tank.

The measured piece of fishing line is folded so that one end is 15 cm longer than the second one. We loop the loop into the slot on the reel and begin to wind it in the direction indicated by the arrow

Since quite often the money saved when buying a trimmer can result in the need for frequent repairs or its complete replacement with a new unit. It took 2 days to figure out the scheme, but the repair itself took only 15 minutes.

This is much faster than taking the trimmer for repair, and then expect it at the time it is being repaired. To help the creativity of chipmakers homemade publisher scheme carburetor. To the main page of AutoMoto Articles about the repair, tuning and maintenance of cars and motorcycles.

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The necessary recommendations, needlework, and descriptions of homemade items with photos. Household affairs. Housekeeping, household life. from choosing and cooking household appliances, to caring and raising children for pets. Homemade snow blower. Trimmers. Lawn mowers.

delimbers and brush cutters. Do-it-yourself chainsaw repair. For all thirst, a chainsaw cannot be classified as complicated. If you don’t have confidence and experience in your own strength, carburetor repair Computers, Internet Everything about computers, the Internet and office equipment Active leisure Articles about travel and tourism, fishing and hunting, amateur sports, about gear and equipment for outdoor activities Repairing a carburetor with your own hands requires a certain maximum concentration and knowledge.

Conduct work very carefully. Since the carburetor has a large number of so-called “affectionate” details. In this article we will analyze the most common malfunctions of the carburetor and, of course, ways to solve them.

The most popular carburetor malfunctions With a carburetor strainer, malfunctions are much more likely to occur two. it either gets clogged or breaks. In order to determine which of the malfunctions your carburetor suffered, you need to unscrew the fuel filter cover and reach the strainer.

If it is unclean, but it works, it must be washed in gasoline or purged. If there is noticeable damage on the gas supply pipe or the filter itself, they must be replaced. Do-it-yourself carburetor replacement.

Sealing of joints in most cases occurs in the inlet or outlet pipe, the joints of the carburetor parts and in the throttle body. Finding places of air leaks is probably through most cases of soap suds.

If the carburetor inlet pipe is faulty, soot traces near a place with a loose connection may appear, or a narrow film of fuel. Finding out the exact places where the fuel is leaking may have wiped all the suspicious places dry.

If there is leakage in the problem area, a film of gasoline is formed. If the carburetor malfunctions, expressed in malfunctions due to suction at the junction of the intake pipe with the carburetor flange, nuts are necessary.

The pull-up of the fasteners should be guided to create evenly and carefully so that there is no distortion of the carburetor flange. In some cases, leakage still remains, moreover, at the end of tightening the fastening nuts.

In this case, you must clean the place of the suction, and replace the gasket in it. If there is a failure of the accelerator pump due to a malfunction of the carburetor, then you will need to put up with its replacement. The accelerator pump parts are not repairable.

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If the pump is working properly, it can be washed with gasoline or purged. It is also worth checking how the parts and levers of the diaphragm of the pump move freely. Pay particular attention to the ball in the spray gun.

All varieties of carburetors produced by manufacturers of gas trimmers are almost impossible to cover. But, since the design of this module, as well as its principle of operation, is largely similar between different models, a generalized description of the processes occurring in the carburetor can be made.

The basis of the trimmer carburetor is a one-piece aluminum housing. Below is a diagram of this unit.

At the bottom of it is a diffuser, which is also called a Venturi nozzle (18). Air is sucked in by the motor through this nozzle.

In the upper part of the diffuser there are fuel channels (11,12). Through these channels, the flow of air draws in gasoline. The fuel pump itself, the jets, and the system used to regulate the flow of the fuel-air mixture can be built-in or installed externally.

When is carburetor adjustment required?

The operator needs to adjust the work node in certain cases:

  • The new engine was run in using 4-5 liters of fuel;
  • Changed the composition of the fuel. the brand of engine oil and gasoline;
  • Weather conditions have changed (in winter, summer);
  • The level of rarefaction of air has changed;
  • The load on the power plant increased;
  • After prolonged storage of the unit;
  • The formation of persistent soot on the spark plug;
  • After starting, the motor stalls immediately or does not develop the required speed;
  • When vibrating, the tuning screws loosened;
  • The amount of fuel consumed has increased;
  • Gasoline is not pumped into the cylinder;
  • It turns out a lot of exhausts.

The main problems and malfunctions of the carburetor.

  • Engine;
  • Carburetor
  • Broken rod;
  • Calm;
  • Starter;
  • Fuel supply;
  • Air filter;
  • Muffler;
  • Gearbox.

Below we will try to help those who want to fix the gas trimmer with their own hands using improvised tools.

Check the gas trimmer spark plug. is it dry or in fuel?

A common malfunction that “chases” the fuel pump is deformation of the pump diaphragm. For this reason, it does not fit properly and the pump channels are not sealed.

The causes of membrane deformation can be as follows:

  • long operation of the trimmer;
  • use of unsuitable fuel;
  • gas entering the pulse channel.

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

  • there is a depletion of the combustible mixture;
  • difficulty starting the engine;
  • there are interruptions in the motor;
  • the piston is damaged.

Also, the aforementioned consequences for the engine can cause clogging of the pump cavity on the impulse side. In this case, dirt enters the membrane through the pulse channel.

To eliminate clogging, you will have to disassemble the carburetor and clean the membrane.

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

A thorough cleaning and rinsing of the strainer will be required to resolve the malfunction. It is also recommended that all openings in the trimmer carburetor body be blown with compressed air.

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

The contact surface is erased due to the presence of abrasive particles in gasoline or due to strong vibration of the motor during operation. This defect of the adjusting lever causes problems with the inlet, as well as improper engine idling.

Inlet needle wear

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

  • the tightness of the seat of the inlet needle is violated;
  • leakage of the combustible mixture appears;
  • there are malfunctions in the engine associated with the re-enrichment of the fuel mixture.

Also, the inlet needle can simply jam.

Jamming the inlet needle can cause dirt in the fuel, or a long idle time without working.

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

This causes re-enrichment of the fuel, and the engine starts to work incorrectly. It is necessary to disassemble the carburetor and clean the cavity of the adjusting membrane.

The membrane can undergo 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;
  • engine malfunction.

This problem may occur if the adjusting lever is not installed correctly or bent before installation. As a result, the contact surface takes the wrong position, which disrupts the additional fuel supply.

Damper wear

Throttle and air dampers mostly wear out due to the presence of abrasive particles in the air. Defective flaps look like they were sandblasted.

Video: Adjusting the Carburetor Gas Cutters You Can Do It Yourself


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

The air and throttle shaft may wear out for 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 ingress of poorly cleaned air, the shaft wears out and can break. Broken parts of the shaft can enter the combustion chamber or engine 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 one (serviceable). The filter must be washed in soapy water and dried.

Arboretum carburetor device

The basis of the petrol scraper carburetor is an aluminum case. It has a diffuser (hole with internal contours). Air is pumped through this hole. The oxygen (air) flow rate depends on the cross-section (passage opening) of the diffuser.

The diffuser is equipped with fuel channels. Of these, fuel is drawn in using an air stream.

Outside the carburetor is installed:

  • fuel pump;
  • jet system;
  • fuel / air mixture control system;

The principle of operation of the carburetor

Carburetor repair chainsaws and chainsaws

Petrol tool carburetors have a little-known but serious problem that can be easily treated.

Chinese Lawn Mower carb repair

Spare parts for Chinese Lawn Mower Chinese Lawn Mower repair.

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

Fuel is sucked into the carburetor system by a pump (its membrane). Then it passes through the fitting in the carburetor. Further, the fluid moves through the inlet and outlet valves of the pump. Filtered by mesh. The needle valve moves into the membrane chamber.

Phased operation of the device:

  1. Air supply to the tube with an air baffle (damper). The partition controls the intensity of the air flow.
  2. The fuel supply system must be narrowed by a diffuser to increase the flow rate.
  3. Gasoline through the float chamber and nozzle tube with narrowing. A camera with a float adjusts the temporary volume of gasoline. In the float chamber, the pressure level is neutral, and in the tube with narrowing is already low. Due to the pressure drop, fuel enters through the nozzle.
  4. The acceleration of the air flow contributes to the transfer of fuel (gasoline) and its atomization. As a result, an air-fuel mixture of the necessary proportion or density is formed.
  5. The air-fuel mixture enters the engine cylinder through the fuel pipe.

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

Simply put, adjusting the carburetor on the brushcutter is creating the optimal fuel mixture due to the correct air supply.

How to replace a carburetor in a brush cutter

How to replace the carburetor on the Echo SRM-22 GES trimmer, well, first of all, it is necessary to conduct the correct diagnosis.

The pulse channel (1) connects the pulse chamber of the pump to the crankcase, namely, with its internal volume. The piston located in the cylinder, making a reciprocating motion, successively changes the pressure in the crankcase (vacuum or pressure increase).

Leaking gasoline from the tank occurs precisely with the participation of the membrane (4). Gasoline enters the carburetor through the fitting (2). Further, its path lies through the inlet valve (3), the exhaust valve (5), through the strainer (6), the fuel channel (10), passes by the needle (14) and fills the chamber (16) having a control membrane (18).

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The valve (14) by means of a lever (17) is connected to the membrane (18). The cavity, which is located below the membrane, is connected to the atmospheric air through the hole (19).

The device operates as follows.

  1. A vacuum is created in the diffuser during the suction stroke. This fact causes air leaks. The amount of air entering the carburetor chamber, as well as the engine power and the number of revolutions depends on the position of the throttle valve (9).
  2. At this time, fuel from the chamber (16) is sucked through the jets (11,12), after which it is mixed with the flowing air. Gasoline, mixed with air, begins to spray. Thus, an air-fuel mixture is created.
  3. The finished mixture enters the cylinder, where it is compressed by a rising piston and ignites at its correct point from the spark generated by the spark plugs.
  4. Since the volume under the control membrane (18) is connected to atmospheric air through the channel (19), the membrane goes up, opening the valve (14) by means of the lever (17). After opening the valve (14), a new portion of fuel enters the chamber (16).
  5. After the chamber (16) is full, the membrane (18) returns to its original position, and the valve (14) closes.

Further, when the motor is running, all of the above processes are repeated. To adjust the amount of fuel entering the diffuser through the nozzles, a screw (13) is used. A screw (15) is also used to adjust the idle speed.

When the regulators are twisted, the fuel mixture is enriched, and when twisted, the mixture becomes lean. Also in some models of carburetors, you can adjust the engine idle by the quantity regulator.

Thus, using 3 adjusting screws, it is possible to achieve maximum engine performance, as well as to configure its uninterrupted operation at any ambient temperature, and even in mountainous areas.

Fuel is sucked into the carburetor system by a pump (its membrane). Cleaning the carburetor of the Honda izy lawnmower. Then it passes through the fitting in the carburetor. Setting up a carburetor on a lawn mower. Further, the fluid moves through the inlet and outlet valves of the pump. Filtered by mesh. The needle valve moves into the membrane chamber.

  1. Air supply to the tube with an air baffle (damper). The partition controls the intensity of the air flow.
  2. The fuel supply system must be narrowed by a diffuser to increase the flow rate.
  3. Gasoline through the float chamber and nozzle tube with narrowing. A camera with a float adjusts the temporary volume of gasoline. The device of the brushcutter is calm 55. In the float chamber, the pressure level is neutral, and in the tube with narrowing it is already low. Due to the pressure drop, fuel enters through the nozzle.
  4. The acceleration of the air flow contributes to the transfer of fuel (gasoline) and its atomization. As a result, an air-fuel mixture of the necessary proportion or density is formed.
  5. The air-fuel mixture enters the engine cylinder through the fuel pipe.

Petrol tool carburetors have a little-known but serious problem that can be easily treated.

Spare parts for Chinese Lawn Mower Chinese Lawn Mower repair.

A carburetor is a power supply module in which liquid fuel and air are mixed before being fed into the engine cylinders. Depending on the tool and its operating mode, mixing and feeding are adjusted appropriately.

The device of the carburetor of the brushcutter is uniform for virtually all cases. It belongs to the category of float devices. The latter provide constant characteristics of the finished consistency.

The mechanism of the module is as follows.

  • Air enters the body of the tube with an air damper. The latter increases or decreases the air flow depending on its own position.
  • In the area where the hole for supplying gasoline is formed, the tube has a constriction. a diffuser. Here the flow rate increases.
  • Fuel from the float chamber through the nozzle is fed into the tube. The level of the float determines the amount of fuel supplied. Because the pressure in the chamber is normal, and the pressure in the tube is low due to the greater dilution of air, gasoline is sucked through the nozzle.
  • Accelerated airflow picks up fuel and atomizes it, forming an air-fuel mixture of suitable density.
  • The mixture is sucked into the cylinder through a pipe.

The stronger the air damper in the tube is open, the higher the density of the air flow, which means that more fuel enters the cylinder. Setting up the carburetor of the brushcutter is reduced to setting such a ratio of the dampers at which the density of the fuel consistency becomes good.

Petal valve fuel spray gun carburetor 2t-engine brushcutters.

How often do we manage to start the engine of the brushcutter, which in all external parameters can be considered serviceable? This happens often, even at the most inopportune moment.

We do not find defects in the engine design. The fuel mixture is composed correctly and based on fresh ingredients. Sparking is present. The carburetor mode settings were not changed, but the engine of our brushcutter still does not start. Why?

Each product of the technical industry has units or parts that have either fine-tuning or high dimensional accuracy when manufacturing and when placing them in the finished product.

Most modern 2t low-power engines are equipped with carburetors with the ability to control modes, depending on the fuel used and the condition of the engine. The design of carburetors may differ among themselves, but the principle of operation of the carburetor, the formation of a fuel-air mixture, remains the same.

In order for you to understand the meaning of the following description, I will say that for any malfunction, some owners give the product for repair and do not load their heads with an unnecessary problem.

Others buy a new one or carry out repairs with a partial replacement of components, and most of the owners of faulty chainsaws or chainsaws independently carry out diagnostics and repairs, determining step by step the cause of the malfunction.

In the beginning, I want to pay attention to some signs that indicate a faulty unit or element of a similar carburetor.

  • A serviceable, compacted engine of the brushcutter is started only when several grams of the fuel mixture are poured into the working chamber through the spark plug hole or through the open carburetor diffuser. (!) I’ll clarify that the discussed engine is working and it will start, but for a few seconds.
  • The engine, which has a reduced compression ratio in the cylinder, has a significant output of piston rings or one of the crankshaft oil seals is not tight enough, it will not start in the usual way (!). A test run of such an engine with the addition of fuel directly to the piston chamber makes sense, since with a working carburetor such an engine can start and can continue to work, but it can be restarted in the usual way no later than a couple of minutes after it stops, while the volume of the crankcase and cylinder contains the unsettled fuel-air mixture.

To make sure that there is no mixture formation, it is possible to spray a little fuel mixture with a medical syringe in front of the carburetor diffuser window just started by the described method. The engine will run until you provide fuel to it.

Each part of the carburetor must be carefully disconnected from the adjacent element and carefully inspected.

  • Check the tightness of the carburetor parts through the gaskets. Tightness may be impaired due to gasket defects, loosening of assembly and mounting bolts.
  • If there is no fuel in the carburetor’s fuel chamber, check the passability and tightness of the channel through which the pressure of the fuel pump membrane is controlled by the pressure from the crankcase. Check the membrane itself and the primer mushroom valve, if any.
  • If there is fuel in the carburetor’s fuel chamber, then this is exactly the case when owners desperately change the carburetor for a new one without knowing the reason, because they can’t start the engine.

In this case, the reason lies in the last segment, in front of the opening of the fuel atomizer, where its valve is installed, which is made of rubberized fabric and the channel controlled by it can be closed, which rarely happens, or is still open.

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The hole of the spray channel, as a rule, is always open when the spray valve is faulty, and no matter how hard you try to start the engine, you will not succeed. A serviceable valve opens only when there is a clear discharge and closes when it is absent.

The entire valve consists of a bronze glass, at the bottom of which there is a seat for the valve itself. A locking ring with restrictive protrusions is installed on top of the glass. The active element inside the valve is a round petal of rubberized fabric.

In the locking state, the petal rests on the saddle and closes the fuel channel. In the open state, the petal is raised and is located at the locking ring itself, but the fuel channel in front of the atomizer is not blocked, since the restrictive protrusions on the ring do not allow the petal to press against the hole and block the entire surface. Fuel at this moment enters the atomizer.

As a rule, the engine of your scythe works at high speeds, otherwise the centrifugal clutch will not work and the cutting knife of the scythe will not have sufficient power. It is so?

And this is so, which means that the valve petal will move synchronously with the engine piston and will hit the saddle and the restrictive protrusions with the greater force, by how many greater differences between pressure and discharge in the carburetor diffuser will occur at high engine speeds.

Gradually, with each working hour, the valve petal wears out and there comes a moment when the engine of the brushcutter stops and does not start any more with any attempts, except for the verification methods I have indicated earlier.

The most interesting thing is that not everyone can take into account this cause of a faulty carburetor and mislead itself about other possible causes of a malfunction of the engine itself.

I assure you that it is possible to restore the carburetor atomizer valve, and this can be done quickly and easily. Watch the video.

We take a membrane from the automobile fuel pump (gasoline) and a drift. You can carefully cut the petal with scissors, but few will get it. The drift in our version is one of the knees of a suitable diameter of the telescopic antenna of the radio receiver.

On a wooden or rubber surface, use a punch to cut out the petal from the membrane of the automobile pump, remove the valve locking ring, change the petals, carefully lock the valve with a ring and assemble the carburetor.

A working engine starts up as if nothing had happened.

The type of carburetors used on petrol scythes with 2t engines is vacuum and needle. Vacuum is understandable, but needle-shaped because the amount of fuel supplied by the atomizer to form the mixture is controlled by a metal rod called a needle.

In the design of some carburetors, the shape of the rod is conical, while other carburetors are equipped with a metering needle in the form of a conventional metal rod. The fixed position of the metering needle for all carburetors is set differently.

Who remembers or knows for sure that the amount of fuel supplied by carburetors on our motorcycles could be changed by fixed needle positions? Below the octane number of gasoline. the needle is higher, the high octane in gasoline. lower the needle. We enrich or impoverish the fuel-air mixture.

Over time, with prolonged operation of the engine, the needle breaks the spray channel a little, and whether you want it or not, you have to lower the needle a little, thereby impoverishing the fuel-air mixture. You can install a needle with a larger diameter and longer length.

We have cases when handling problematic braids, on the carburetors of which adjusting bolts of a fixed position of the spray needle were turned out. For the sake of curiosity, they rely on a certain jet. You will return everything to its place and the engine can be freely started.

If it is not possible to start a brushcutter, then the first thing to do is to check the fuel in the tank and its quality. To refuel the tool, it is recommended to use high-quality gasoline purchased at gas stations, the brand of which should not be lower than AI-92.

Saving on cheap fuel can lead to breakdown of the cylinder-piston group, the repair of which can take a third of the cost of the scythe itself. Equally important is the proper preparation of the fuel mixture from gasoline and oil.

The proportional ratio of these components of the mixture is indicated by the manufacturer in the manual. It is not necessary to prepare the fuel mixture in large volumes, since during long storage its properties are lost. It is better to use a freshly prepared mixture.

When preparing the fuel mixture, pour oil into gasoline using a medical syringe, which allows you to precisely observe the required proportion of components

Contamination of the fuel filter in the tank can also interfere with the operation of the engine. Therefore, if there are problems starting the motor, check the condition of the filter. Replace the filter if necessary. Do not leave the inlet pipe without a fuel filter.

The air filter also needs to be checked. When contaminated, the part is removed, in the field it is washed in gasoline and put in place. In the country or at home, the filter can be washed in water using detergents.

After that, the filter is rinsed, wrung out and dried. The dried filter is moistened with a small amount of oil used to prepare the fuel mixture. Excess oil is removed by squeezing the filter by hand. Then the part is installed in place. The removed cover is put back and fixed with screws.

The air filter, washed in the fuel mixture, wrung out and dried, is put into place in the plastic case and closed with a lid

How to adjust the carburetor on a brush cutter

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

Right (L). fuel mixture adjustment for low revs.

Need to find the maximum idle speed. To do this, slowly unscrew the screw (L) to the right and left.

To adjust, turn the screw a quarter turn necessarily counterclockwise.

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

  • clockwise. increase;
  • counterclockwise. decrease.

For proper adjustment of idling, it is typical:

  • steady work of the cold engine;
  • not overestimated speed of the hot engine;
  • a large headroom for the trimmer head;
  • stable operation of the engine when changing position (sharp rise or lowering of the knife).

Left (N). adjusts the mixture at high speeds. (The screw is configured last).

From the left screw (N) depends on the overall adjustment of the maximum speed, engine power, temperature and gas mileage.

The carburetor trimmer with the last screw is configured as follows:

  1. Open the throttle to full, while giving out full throttle. Turn the screw clockwise until the speed drops (in this case, they are oriented by ear).
  2. Turn the screw as slowly as possible counterclockwise until the engine runs unevenly.
  3. Then turn back quite a bit, barely hearing stable, smooth operation.
  4. For a more visual application of skills, it is more convenient to consider the work of an experienced user:

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

The correct setting of the carburetor with your own hands in this case is the combustion of the fuel mixture without residue, the color of the candle should be light brown.

Related posts

Signs of imbalance

Carburetor debugging is certainly done in the manufacture of the apparatus. Usually, the owners will find out about the need to adjust the fuel supply with their own hands only after quite severe breakdowns, during the correction of which the module was removed and, for example, cleaned.

Signs of a failure in the settings are as follows:

  • it starts up, but the motor stalls here. since the engine can only work when a certain amount of gas is supplied, with very “poor” fuel, in other words, blocking the supply channel, the motor will stop;
  • very high fuel consumption, a lot of exhaust gases. the result of incomplete combustion of consistency. In this case, there is a lot of fuel, and the mixture comes out extremely dense.