How to clean the carburetor with a trimmer

Damper worn out

The throttle and air damper become unusable due to the ingress of dust, metal particles, etc. with the air flow. Damaged dampers are similar to parts that have been blasted with sand. Due to wear on the dampers, the efficiency of the motor decreases, and breakdowns are detected. Piston and cylinder wear out.

The dampers become unusable due to improper maintenance of the air filter or its breakdown.

In some cases, this filter is simply not suitable for your lawn mower or trimmer model. In the end, the motor shaft will suffer. its pieces fall into the engine channels, causing the piston to be broken.

clean, carburetor, trimmer

Broken primer

Primer. a hand-held mini-pump for forced pumping of fuel into the carburetor. For a successful start of the engine, it may be necessary to pump 20 ml of gasoline manually.

Blocking the adjusting space

Deposits can build up in the adjustment compartment. The needle does not completely close the hole, and a lot of gasoline enters the fuel chamber. the engine overflows it, possibly fills the spark plugs as well. Because of this, the gasoline-air mixture contains an increased amount of gasoline vapors. Efficiency drops noticeably.

Carburetor device

lawn mower (lawn mower) contains a base. a body made of aluminum, which houses the rest of the parts, working harmoniously as a whole. There is a diffuser in the carburetor body. a stroke with internal channels through which air is pumped.

The larger the cross-section of the diffuser, the more actively oxygen is supplied together with air. an oxidizer, in which the fuel is burned (gasoline-oil mixture).

Channels branching off from the diffuser stroke deliver fuel, with which the forced air mixes, entraining gasoline vapors with it. Outside the main carburetor compartment are located:

  • jets;
  • mini fuel pump;
  • unit regulating the mixing of fuel with air.

The latter forms the very explosive mixture ignited in the carburetor combustion chamber.

Adjustment diaphragm damaged

The membrane often deforms (sometimes breaks) due to the continuous operation of the lawn mower or trimmer for several hours. If you abuse this “shock” mode of operation, membrane damage occurs more often. New breakdowns will sprinkle like a cornucopia:

  • the piston will break;
  • the number of unsuccessful engine start attempts will increase dramatically;
  • the fuel mixture contains too little gasoline;
  • useful (thermal) power will sharply drop.

Elimination methods

The list of upcoming work on the engine may be as follows:

  • replacement of the fuel pump;
  • disassembly and flushing of the strainer;
  • replacement of the adjusting lever;
  • it is also necessary to clean the adjustment space;
  • replacement of the membrane (or the entire block where this membrane is located);
  • adjusting the inlet, outlet and needle valves;
  • replacement of dampers;
  • cleaning fuel channels and diffuser;
  • replacement of screw springs;
  • change of primer.

Not all of this work can be done. Often it turns out that many of them are not needed if a specific malfunction is immediately detected.

How to adjust the carburetor of lawn mowers?

  • Carburetor device
  • Principle of operation
  • Major problems
  • Elimination methods
  • Adjusting the carburetor on the lawn mower

a lawn mower or trimmer, despite its relative simplicity (compared to a car engine), sooner or later fails. There comes a time when long downtime and restarts of the gasoline unit cannot be avoided. maintenance is needed. In advanced cases, repair is required, or rather, replacement of worn-out parts with the same new ones. Until you are faced with the need to replace your spent parts, carburetor maintenance is required. cleaning, rinsing, reconfiguring mechanisms.

Carburetor cannot be adjusted

The fact that the adjustment is too coarse (it is not possible to accurately set the parameters) are to blame for the springs on the adjusting screws. A lawn mower or trimmer manufacturer may supply unnecessarily thick and stiff springs. You can find others either in workshops where similar equipment is repaired, or purchased from any dealer or official representative of the company that produced the motor for your trimmer or power scythe.

Fuel ratio

I read somewhere that if different mixing ratios are indicated in the operator’s manual for the lawn mowers and on the oil canister, the proportion indicated in the manual should be used.

For a long time he did this. excess oil flowed from the engine onto the gas tank and carbon deposits were constantly formed on the candle, since the manual indicated the proportion for the run-in engine 1:25, and on the canister. 1:50. After switching to a ratio of 1:50, the appearance of oil drips stopped. The candle continued to burn, but at a lower intensity (the carburetor was not yet adjusted).

Until now, some users of gasoline-powered tools determine the proportion of the fuel mixture “by eye”. If during the preparation of the mixture the amount of oil is underestimated, after a while an extraneous sound may appear immediately after starting the engine, gradually disappearing during warming up, and the engine stops with a sharp jerk. Continued use of the trimmer in this mode will lead to its failure.

Fuel pump problems

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

The reasons for membrane deformation can be the following:

  • long work of the trimmer;
  • use of unsuitable fuel;
  • ingress of gases into the impulse channel.

As a result, diaphragm damage reduces pump performance and, as a result:

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

Also, the above-described consequences for the motor can cause clogging of the pump cavity on the impulse side. In this case, dirt enters the membrane through the impulse channel.

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

How to adjust the carburetor on a lawn mower

Before adjustment, you must thoroughly clean the filters according to the maintenance instructions in the instructions.

Further adjustment of the carburetor of the lawn mowers with their own hands is carried out with the adjusting screws. There are three of them:

Right (L). adjusting the fuel mixture for low rpm.

You 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 of a turn, be sure to counterclockwise.

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

  • clockwise. increase;
  • counterclockwise. decrease.

For the correct adjustment of the idle speed, it is characteristic:

  • stable operation of a cold engine;
  • not overestimated speed of a hot engine;
  • a large reserve of turns for the trimmer head;
  • stable operation of the engine when changing position (sharp lifting or lowering of the knife).

Left (H). mixture adjustment at high rpm. (The screw is adjusted last).

The left screw (H) determines the overall adjustment of maximum speed, engine power, temperature and gasoline consumption.

Setting up the carburetor for lawn mowers with the last screw is done as follows:

  • Open the throttle to full, at the same time give full throttle. Turn the screw clockwise until the speed drops (in this case, orientate by ear).
  • Turn the screw counterclockwise as slowly as possible until the engine runs unevenly.
  • Then turn back quite a bit, barely hearing a stable, even operation.
  • For a more visual use 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 only by the speed and stability of the engine.

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

Idle speed adjustment

We start adjusting low speed. The screw limits the return movement of the throttle lever. by turning it, we increase the idle speed, unscrewing it, we decrease it. Adjust so that the engine runs confidently at low revs and even slightly accelerated (for better starting), but so that the line reel or knife does not rotate, and there is a sufficient reserve of revolutions before they start spinning. If the engine starts poorly, increase the idle speed even more.

Damper wear

The throttle and choke valves are mainly subject to wear due to the presence of abrasive particles in the air. Defective dampers look like they have been sandblasted.

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

How to adjust the carburetor on the trimmer video

Increased fuel consumption and the rapid formation of carbon deposits on the spark plug when using a properly prepared fuel mixture indicate the need to adjust the carburetor. Here’s how to tune trims with carburettors with one fuel adjusting screw.

Maximum speed limitation

After adjusting the fuel mixture and low speed, check how the lawn mower engine will run at maximum speed. If necessary, limit the maximum speed to the required level using the hollow screw. Loosen the fixing nut and screw in the screw to decrease the maximum speed or turn it back to increase it. Tighten the nut after adjustment. The maximum RPM setting is necessary to protect the trimmer motor from overheating and to be able to use the start key lock to reduce right hand fatigue.

In the future, it may be necessary to readjust the trimmer carburetor. For example, if the engine starts to rev poorly when running at full load, loosen the screw another quarter turn. If starting is difficult, increase idle speed. Both weather conditions and the quality of the fuel mixture can affect the operation of lawn mowers. Vibration can cause the adjusting screws themselves to turn.

Throttle and choke shaft wear

The air and throttle shaft can 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 shaft parts can enter the combustion chamber or crankcase and cause serious damage to the entire piston system.

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

Adjustment lever defective

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

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

Clogged strainer

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

Correcting the malfunction will require thorough cleaning and rinsing of the strainer. It is also recommended to blow compressed air through all holes in the carburetor trimmer housing.

How the benzotrimmer carburetor works and works

It is almost impossible to cover all types of carburetors produced by manufacturers of gas trimmers. 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. This information will allow the user to understand the principles of operation of the device, eliminate the malfunctions that have arisen and operate it correctly.

The carburetor trimmer is based on a one-piece aluminum body. Below is a diagram of this block.

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

The smaller this hole, the faster the air flows, and the higher the level of its rarefaction in the zone with the smallest diameter.

The top of the diffuser contains the fuel channels (11,12). Through these channels, the air flow draws in gasoline. The fuel pump itself, jets and the system used to regulate the supply of a mixture of fuel with air can be built-in or installed externally.

The throttle valve (9) controls the amount of air sucked into the carburetor. Its amount affects the power that the engine develops. The damper (7) is used for cold starting. It must be closed if you are going to start the unit. After the engine has started, it must be opened, otherwise, the engine will immediately stall.

The impulse channel (1) connects the impulse chamber of the pump to the engine crankcase, namely, to its internal volume. The piston located in the cylinder, producing reciprocating movements, successively changes the pressure in the crankcase (vacuum or pressure increase). The pressure drops force the diaphragm (4) to move. Therefore, the operation of the pump is synchronized with the operation of the engine.

The suction of gasoline from the tank occurs precisely with the participation of the membrane (4). Gasoline enters the carburetor through the union (2). Further, its path lies through the inlet valve (3), the exhaust valve (5), through the mesh filter (6), the fuel channel (10), passes the needle (14) and fills the chamber (16), which has a control diaphragm (18).

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

The device functions as follows.

  • A vacuum is generated in the diffuser during the suction stroke. This fact causes air leakage. The position of the throttle valve (9) determines the amount of air entering the carburetor chamber, as well as the engine power and the number of its revolutions.
  • At this time, fuel is sucked in from the chamber (16) through the jets (11,12), after which it is mixed with the flowing air. Gasoline, mixing with air, begins to spray. Thus, an air-fuel mixture is created.
  • The finished mixture enters the cylinder, where it is compressed by the rising piston and ignited at its highest point from the spark generated by the spark plugs.
  • Since the volume under the control diaphragm (18) is connected to atmospheric air through the channel (19), the diaphragm 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).
  • After the chamber (16) is full, the diaphragm (18) returns to its original position, and the valve (14) closes.

Further, when the motor is running, all the above processes are repeated. A screw (13) is used to adjust the amount of fuel entering the diffuser through the nozzles. The screw (15) is also used to adjust the idle speed. When the regulators are twisted, the fuel mixture is enriched, and when the regulators are twisted, the mixture becomes lean. Also, in some models of carburetors, you can adjust the idle speed of the engine with a quantity regulator. It is usually located outside and, when twisted, abuts against a lever attached to the throttle shaft.

Thus, using 3 adjusting screws, you can achieve maximum engine performance, as well as adjust its smooth operation at any ambient temperature, and even in mountainous areas.

How to properly adjust the trimmer carburetor

On trimmers, in addition to electric motors, gasoline internal combustion engines are installed. This mechanism requires special attention to itself, since if it is incorrectly configured, it will either refuse to work, or will work intermittently and loss of power. Basically, engine tuning is about adjusting the fuel flow, and this is done using the carburetor trimmer.

Common carburetor malfunctions

Failure of the trimmer carburetor occurs due to the use of poor quality gasoline, a damaged air filter and the accumulation of dirt in the chamber of this unit. Most often, it is quite possible to repair the carburetor with your own hands. Listed below are typical lawn mowers carburetor malfunctions.

Intake needle wear

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

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

Also, the inlet needle may just jam.

A jammed inlet needle can cause dirt in the fuel or a long idle time.

Fuel pump problems

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

The reasons for membrane deformation can be the following:

  • long work of the trimmer;
  • use of unsuitable fuel;
  • ingress of gases into the impulse channel.

As a result, diaphragm damage reduces pump performance and, as a result:

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

Also, the above-described consequences for the motor can cause clogging of the pump cavity on the impulse side. In this case, dirt enters the membrane through the impulse channel.

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

Trimmer carburetor. How to properly adjust the trimmer carburetor.

On trimmers, in addition to electric motors, gasoline internal combustion engines are installed. This mechanism requires special attention to itself, since if it is incorrectly configured, it will either refuse to work, or will work intermittently and loss of power. Basically, engine tuning is about adjusting the fuel flow, and this is done using the carburetor trimmer.

The standard design of any gasoline trimmer necessarily includes a fuel system, the basis of which is the action of a regular carburetor. Its design and initial principle of operation are almost the same for all lawn mowers, regardless of their design features and purpose.

The lawn mowers carburetor consists of an all-metal aluminum body that protects the internal components of the unit from moisture, small debris and dust. In the lower part of the body there is a built-in diffuser, the second name of which is “Venturi nozzle”. The main function of this standard part is to supply air in the amount required by the fuel unit to enrich the fuel. A diffuser works according to a simple principle: the smaller its diameter becomes, the more intensively the air is sucked in. This is due to the fact that in the area of ​​the smallest diameter, the level of air vacuum becomes maximum.

The upper part of the built-in factory diffuser is pre-equipped with fuel pipes, through which, under the influence of air, the fuel mixture is drawn in. The rest of the carburetor parts: standard adjusting screws and a fuel pump, can be located both inside and outside the carburetor.

The device of the carburetor of lawn mowers includes a throttle valve, the main task of which is to regulate the volume of intake air. The larger the amount of air, the higher the rated power of the trimmer power unit. Another function of the damper is to facilitate cold starting of the engine. If this is the first time the mower is started after a long period of inactivity, the shutter must be closed. Immediately after starting the engine, the part must be opened, otherwise the internal combustion engine will stall.

The carburetor for the trimmer is equipped with an impulse channel that connects the internal cavity of the engine crankcase with the impulse chamber of the pump. The piston located in the engine cylinder creates reciprocating movements, which leads to gradual changes in pressure inside the crankcase. At the same time, the membrane is set in motion. Thus, the action of the pump is fully synchronized with the operation of the power unit.

The diaphragm of the standard carburetor takes an active part in the suction of fuel. It enters the fuel unit through the fitting. The fuel then passes through the integrated inlet and outlet valves, then through the strainer and fuel pipe. The fuel then flows next to the needle and gradually fills the chamber equipped with the control diaphragm.

The standard carburetor trim valve is connected to the diaphragm using a lever. Below the built-in membrane there is a cavity into which air is sucked in through a special opening.

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

When is the carburetor setting of the household trimmer required? Adjust the built-in trimmer carburetor when:

  • running in a new engine, during which 4 to 5 liters of fuel mixture were used;
  • sudden changes in the weather;
  • changes in the air pressure. for example, when the lawn mower is often used in mountainous areas;
  • long-term simple trimmer;
  • intensive growth of loads on the power unit of lawn mowers;
  • arbitrary unscrewing of the built-in adjusting screws of the carburetor. this causes increased vibration of the internal combustion engine;
  • changes in the quality of the components of the fuel mixture;
  • pouring fuel with a carburetor, resulting in an increase in fuel consumption;
  • the regular appearance of a thick layer of resinous deposits and carbon deposits on the surface of the electrodes of a standard trimmer spark plug;
  • starting the engine and its arbitrary shutdown or a slow set of revolutions;
  • lack of fuel flow into the cylinder of the power unit;
  • an increase in the volume of emitted waste gases.
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The lack of timely adjustment of the carburetor threatens with a serious breakdown of the trimmer, up to the complete failure of its factory engine.

Do-it-yourself lawn mowers carburetor adjustment. Periodic adjustment of the trimmer carburetor should be performed on a serviced and fully serviceable power unit. Before starting the procedure, the operator must thoroughly rinse the internal combustion engine parts and inspect its CPG for 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 lawn mowers structure.

The lawn mower engine must be running under a certain load when adjusting the carburetor. It is best to install a cord of the appropriate diameter or cutting knives on the trimmer.

After installing the cutting elements, the operator should start the engine of the trimmer 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 rotated, then it is necessary to reduce the speed generated by the motor. To do this, turn the lower adjuster, often marked with the letter “T”, to the left, until the installed cutter comes to a complete stop. Further configuration of the fuel assembly is as follows:

  • The “L” regulator, located on the right, is responsible for enriching the fuel mixture with air when the engine is running at low revs. The position of this screw must be adjusted first. To do this, the operator will need to achieve maximum engine speed when idling. to do this, turn the screw “L” one by one to the right or left. As soon as the maximum speed is reached, the screw will need to be turned 1/2 turn to the left;
  • The screw “T” or “LA” is required to adjust the idle speed. While turning it to the left, the speed of the power unit will decrease, and when turning to the right, accordingly, it will increase;
  • The regulator “H”, provided on the left, is responsible for enriching the fuel mixture with air when the internal combustion engine trimmer is running at high rpm. This screw is also needed to adjust the engine power and the amount of fuel consumed. Its position is adjusted by turning the screw to the right or left side until the maximum permissible engine speed is reached. After that, the screw “H” will need to be turned 1/2 turn to the left.

Common carburetor malfunctions. Failure of the trimmer carburetor occurs due to the use of poor quality gasoline, a damaged air filter and the accumulation of dirt in the chamber of this unit. Most often, it is quite possible to repair the carburetor with your own hands. Listed below are typical lawn mowers carburetor malfunctions.

Fuel pump problems. A common malfunction that “pursues” the fuel pump is the deformation of the pump membrane. For this reason, it does not fit properly and the pump passages are not sealed.

The reasons for membrane deformation can be the following:

  • long work of the trimmer;
  • use of unsuitable fuel;
  • ingress of gases into the impulse channel.

As a result, diaphragm damage reduces pump performance and, as a result:

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

Also, the above-described consequences for the motor can cause clogging of the pump cavity on the impulse side. In this case, dirt enters the membrane through the impulse channel.

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

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

Correcting the malfunction will require thorough cleaning and rinsing of the strainer. It is also recommended to blow compressed air through all holes in the carburetor trimmer housing.

Adjustment lever defective
This breakage occurs when the contact surface of the lever wears out.

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

Intake needle wear
The inlet needle fails, as a rule, due to the presence of abrasive particles in the fuel fluid.

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

Also, the inlet needle may just jam.

A jammed inlet needle can cause dirt in the fuel or a long idle time.

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

This causes over-enrichment of the fuel and the engine starts to malfunction. It is necessary to disassemble the carburetor and clean the cavity of the control membrane.

Deformation of the control diaphragm
The membrane can undergo deformation during prolonged operation of the unit and when using aggressive fuels.

Failure of normal adjustment due to a defect leads to:

  • damage to the piston;
  • difficulties when starting up;
  • depletion of fuel;
  • improper engine operation.

Intake Adjustment Lever Problem
This problem can occur if the adjusting arm is not properly installed or if it bends before installing. As a result, the contact surface takes the wrong position, which disrupts the additional fuel supply.

Damper wear
The throttle and choke valves are mainly subject to wear due to the presence of abrasive particles in the air. Defective dampers look like they have been sandblasted.

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

Throttle and choke shaft wear
The air and throttle shaft can 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 shaft parts can enter the combustion chamber or crankcase and cause serious damage to the entire piston system.

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

How to properly adjust
Before you start adjusting the carburetor trimmer, do the following:

  • flush the engine;
  • replace or clean the spark plug;
  • change to a new one or clean the air filter (it is recommended to wash it in warm, soapy water, wring it out and let it dry well).

It is also necessary to install a cord of a suitable diameter in the trimmer coil or install knives. this is done so that during the tuning process the engine has at least some kind of load. After installing the cutting tool and starting the gasoline engine, let it warm up for 10 minutes.

If at idle speed of the engine you notice that the cutting tool rotates, then it is necessary to reduce the engine speed. This is done using the lower idle speed control, often marked with the letter “T”. But, for example, on the Stihl trimmer, this screw may be marked “LA”.

So, turn the idle speed control to the left until the trimmer head comes to a complete stop.

To adjust the carburetor, 3 regulators (screws) are used.

  • The right L regulator adjusts the enrichment level of the combustible mixture at low revs. It needs to be regulated first. Achieve maximum idle speed. This is done with the L knob by turning it left and right. After finding the point of maximum speed, return the regulator half a turn to the left (counter-clockwise).
  • The lower T (LA) adjuster is used to adjust the idle speed. Turning it to the left, the engine speed will begin to decrease, and when turning the regulator to the right, the engine speed will increase.
  • The left regulator H is responsible for enriching the fuel mixture at high speeds. The enrichment setting completes the carburetor adjustment. Also, using this regulator, you can adjust the maximum speed, fuel consumption and engine power.

Important! If the engine is allowed to run at full speed for more than 10 seconds, then it may fail.

To eliminate this nuisance, adjustment will be required. With the engine running, give full throttle, then turn the regulator “H” to the right until the speed starts to decrease. After that, the regulator “H” must be slowly scrolled to the left until you hear the uneven operation of the engine. Then you should turn the knob “H” to the right until you hear the smooth operation of the motor.

After carrying out the above steps, the carburetor setting can be considered complete. After correct adjustment, the engine should confidently pick up speed, a little quarter at maximum speed, and when idling, the cutting tool should not turn. This manual is suitable for adjusting carburettors on Huter, Patriot and other lawn mowers.

There are also carburetors without a screw, which is responsible for enriching the combustible mixture at low speeds. That is, they have only 2 adjusting screws: an idle speed regulator and a fuel mixture quality regulator at high speeds.

Benzotrimmer loves cleanliness. It is necessary to monitor the cleanliness of the air filter and fuel. Gasoline bought at a gas station is better to stand for 2 days and pass through the simplest filter. a piece of bike cloth.

We check the electrical equipment as follows:

We unscrew the candle, inspect the gap between the electrodes. We can set the correct gap between the electrodes in the “old-fashioned” way. We take the razor blade, break it in half and insert a homemade probe between the electrodes. If the blades fit tightly, then the gap is perfect.

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We put the cap of the high-voltage wire on the candle and lean the candle against the metal surface of the engine. We pull the starter several times. If the spark hits one point well, then the gap is adjusted correctly. If not, the spark is weak or “wandering”, then it is necessary to re-adjust the gap between the electrodes.

Also, the ignition coil may be punctured in electrical equipment. In this case, the lawn mower will not start, or it will start and work intermittently, and then it stalls, or it will not start at all when it is hot.

You can check the coil’s serviceability in the same way as when checking the spark: we unscrew the candle, lean it against the trimmer body. If there is no spark when you jerk the starter, or it appears every other time, you need to change the coil.

The numbers mean the following: one part of the oil takes fifty parts of gasoline. Hence: 1000 ml (1 liter of gasoline) is divided by 50, we get 20 ml, that is, 1:50.

Thus, you can calculate the composition of the fuel mixture (gasoline / oil) in any proportions. To add oil to gasoline not “by eye”, you can advise to take a 20 ml medical syringe, draw oil into it and “inject” into a container for preparing a fuel mixture.

Some tricks for working with the petrol trimmer.

See the trimmer instructions for the continuous running time of the lawn mower. On average, we mow for 15-20 minutes, after which we turn off the trimmer and let it cool for 3-5 minutes. Weather conditions also affect the duration of continuous operation. In hot weather, when mowing tall grass, thickets of weeds, under heavy load, the trimmer overheats faster.

Many lawnmower problems arise from improperly prepared fuel mixtures. In two-stroke engines, lubrication is carried out with a special oil (not ordinary engine oil!), Mixed with gasoline. If the oil is not mixed with gasoline, the lawn mower will quickly fail. Mix the oil / gasoline in the proportion indicated in the trimmer instructions. Usually it is 1:40 or 1:50.

The question often arises: the proportion of 1:50 is how much oil and gasoline?

Any braid has a knife on the protective cover, which cuts off the excess fishing line after winding, and the cable is no longer cut. If part of the cable breaks off, then the result is an imbalance, increased vibration. Bottom line: shaft drive bearings break.

Prevention of contamination

To prevent contamination of the carburetor system, it is necessary to use only high quality fuel. To do this, it is worth refueling only at proven gas stations, where they sell clean and undiluted fuel. Once a season, it is necessary to check the fuel, mesh and air filters, and, if necessary, replace them. this allows for better fuel cleaning in the system, and does not allow contamination to enter the carburetor. Stable operation of the engine and fuel system requires cleaning the carburetor by the method without dismantling the equipment once every at least 3 months.

Cleaning and flushing the carburetor: what is important to know

Modern fuel is not always of high quality, and as a result, corrosion products, dirt or water residues accumulate in carburetor structures. This can lead to problems in the operation of the device itself and the car as a whole, therefore it is very important to monitor the condition of the equipment. How you can flush the carburetor and how often you need to do it, we will tell you in our article.

Signs of severe blockage

The carburetor gets dirty both outside and inside. Obvious signs of severe blockage:

  • difficulties when starting a power unit in a car;
  • malfunctions of the engine at idle mode;
  • with sharp clicks on the gas, dips are observed;
  • the car needs more fuel.

Other malfunctions cannot be ruled out, which can also lead to the appearance of these signs of breakdown, but if the carburetor has not been washed for more than a year, then in any situation it will not be superfluous to do this. Before starting work, it is necessary to replace the fuel filter in the system so that after flushing the equipment, exclusively purified gasoline gets into the device.

How to effectively flush the carburetor?

Many habitually use standard fluids for home washing, which almost every motorist has at home:

  • high quality refined gasoline;
  • kerosene of any type;
  • appropriate solvents;
  • diesel fuel.

How to clean a carburetor without removing it from the engine?

Some manufacturers offer this method if it is not possible to do at least partial disassembly of the carburetor.

For such flushing without dismantling, a special agent is used to clean the carburetor structures (not aerosol) and one can is completely enough for one flushing procedure.

Algorithm of actions when using such tools:

  • we find a reliable gas station where they sell high-quality gasoline;
  • remove the plug from the fuel tank;
  • carefully open the jar in which the flushing liquid is sold;
  • pour the liquid into the tank using a special watering can;
  • then fill the tank in the car to the full level with gasoline (fuel).

After that, you need to drive until you run out of fuel. The procedure is then considered complete. It makes it easier to start the engine at the start, as well as reduce the level of toxicity of exhaust gases. In addition, it is believed that a cleaned carburetor in this way saves fuel up to 7%, which is very significant. Manufacturers of such products recommend doing this procedure after every next 3000 km of run. However, when compared with other methods of cleaning the carburetor, it is ineffective, and can only be considered as a temporary measure.

Basic Ways to Flush Carburetor and Flushing Aids

The two most effective ways to flush the carburetor are:

  • With partial disassembly of the device. Partial disassembly is the most popular home maintenance option for the carburetor. To do this, remove the air filter, then remove the cover and remove all available elements from the device in order to wash off the dirt from them and reassemble the structure. The effectiveness of such cleaning is high, since you can visually determine how clean the parts are.
  • Complete disassembly. This is the most efficient but time consuming method. After disassembling the structure, small parts are soaked in gasoline, acetone or special cleaning fluids. After that, you can blow through all small elements with a dense jet of air.

Why is carburetor cleaner spray the most popular

Car carburetor sprays (such as Belife Karb Choke Cleaner) are the most effective. If they are used regularly, it is possible to prevent a large number of problems associated with contamination of carburetor parts. In the composition of such a tool has chemical organic compounds, inorganic elements and various solvents. Some are used as an excipient, while others are used as basic cleaning agents.

It is the basic substances that are able to penetrate into the smallest parts of the device, and can cope with the most difficult contaminants, including resinous elements on the walls and parts of the carburetor. It is also the easiest way to clean carburetors. However, in difficult cases, a can for cleaning the carburetor will not help, and other available means are needed. From time to time, a car carburetor will still require professional service and you will have to go to a car repair shop.

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Which is better: rinse thoroughly or blow?

The carburetor is a complex device with many different parts. It is possible to completely eliminate contamination by flushing not only the body and cover, but also internal parts, including the jets, in which the channels have a diameter of no more than 2 mm. It will be difficult to wash such contaminants at home, and the best solution would be to blow through these thin channels, for which a jet of densely compressed air is used. But for a start, it is better to treat them with an aerosol agent, which will dissolve some of the dirt, and make the channels soft and pliable, so that later it will be more efficient to blow.

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