How To Adjust The Fuel Trimmer

8th June 2020

The increased fuel consumption and the rapid formation of soot on the lawn mowing candles when using a correctly prepared fuel mixture indicate the need for carburetor adjustment. This describes how to set trimmers with carburetors that have one screw for adjusting the fuel supply.

Carb adjustment

Flush the air filter before adjusting the carburetor. It is recommended to rinse it after every 10 hours of operation. After that, you can begin to adjust. The example photograph shows the carburetor of the gasoline trimmer PRORAB-8406. The numbers indicate the adjusting screws that we will use.

Prorab-8406 gas trimmer carburetor adjusting screws

Purpose of adjusting screws:

Fuel mixture adjusting screw.
Idle adjustment screw.
The screw limits the maximum speed.

Start the lawn mower and wait until it warms up.

Fuel adjustment

Start slowly tightening the fuel mixture adjusting screw until the engine stalls or stalls unless you catch the moment. Then unscrew the screw a quarter of a turn if the engine is not dead, or half a turn if it is dead. Start the stalled engine. Check, by opening the throttle, how the engine accelerates. Continue to loosen screw # 1 a quarter of a turn until the engine starts to confidently gain high revs when progazovka. This will be the moment of the most economical stable engine operation. At the PRORAB-8406 gas trimmer, the adjusting screws are turned clockwise, unscrewed. Against, for some other brands the lawn mowing may be vice versa.

Idle adjustment

We proceed to adjust the low speed. Screw number 2 restricts the return movement of the throttle lever. By wrapping it, we increase idle speed, unscrewing. Reduce it. Adjust so that the engine runs confidently at low speeds and even slightly faster (for a better start), but so that the reel with fishing line or knife does not rotate, and before starting to rotate, there is a sufficient margin of speed. If the engine starts poorly, still increase idle speed.

Maximum speed limit

In the future, it may be necessary to adjust the trimmer carburetor. For example, if the engine, when operating at full load, starts to pick up revs poorly, loosen screw No. 1 another quarter of a turn. If it is difficult to start, increase the idle speed. Weather conditions and the quality of the fuel mixture can affect the operation of lawn mowers. The vibration can also make the adjusting screws turn themselves.

The spring may interfere

Spring mixture adjustment screw

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

From personal experience

Lawn mowing or trimmer

A trimmer is a broader concept than a lawn mow (lawn mow), since it can also be electric. A gas trimmer and a lawn mower are one and the same.

Some authors claim that the trimmer is a weaker tool, in contrast to the more powerful lawn mowers, which can be used to mow shrubs. Personally, I have a tool with a maximum power of 1.7 kW and capable of mowing a small shrub up to 10 mm thick, as stated in the instructions. The user manual is called “Petrol trimmer”.

Fuel mix ratio

I read somewhere that if in the instruction manual for lawn mowers and on the canister with oil different proportions of the preparation of the fuel mixture are indicated, the proportion indicated in the manual should be used.

It did so for a long time. Excess oil flowed from the engine to the gas tank and soot was constantly forming on the candle, since the manual indicated the proportion for the engine being run in 1:25, and on the canister. 1:50. After the transition to a proportion of 1:50, the appearance of oil drips stopped. The candle continued to burn, but with less intensity (the carburetor was not yet adjusted).

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

Candle cleaning

In the worst days of working with a trimmer with an unregulated carburetor, the engine stopped starting after using each fuel tank. And only after cleaning the candles from soot could we continue to work.

To clean the electrodes, fine sandpaper was used, and to clean the space between the insulator and the body, a thin clerical clip with a bent end was used. First, the electrodes were wiped off with a lot of dirt with a rag, then they were cleaned with sandpaper. After that, the candle was lowered into diesel fuel and the moistened soot was scraped off with a paper clip from the surfaces of the insulator, the inside of the housing and between them. Further, the candle was lowered several times in diesel fuel, which was then shaken off from it along with impurities. Sometimes the cleaning procedure with a paper clip and washing are repeated. After that, the candle was wiped dry and was ready for further use.

Incredibly, one tank of the fuel mixture with an unregulated carburetor can be consumed in less than 10 minutes. It was tested in practice when the trimmer was started and operated at high speeds with maximum fuel supply (the adjustment screw was unscrewed much more than normal).

Source

Lawn mowers, like all gasoline powered tools for the garden, are not difficult to maintain. It is possible and necessary to repair, configure yourself. For example, adjusting the carburetor of the lawn mowers with your own hands is a matter of five minutes.

Lawn mowing carburetor is a unit 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.

The main problems and malfunctions of the carburetor.

Strainer There are only two problems with this element:

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.

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).

The carburetor starter in most cases does not function due to blockages. 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 device of the carburetor lawn mowers

The basis of the carburetor of the lawn mowers is an aluminum case. It has a diffuser (hole with internal contours). Air is blown 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:

The principle of the carburetor lawn mowers

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:

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

How to adjust a carburetor on a lawn mower

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

Further tuning of the carburetor of the lawn mowings with your own hands is done by adjusting screws. There are three of them:

Right (L). Adjustment of the fuel mixture 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.

Bottom (T). Is responsible for adjusting the engine at idle.

For proper adjustment of idling, it is typical:

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

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

Interestingly, from the point of view of the author of the, 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.

Carburetor adjustment of lawn mowers in practice.

Despite the high productivity, mobility and unpretentiousness in work, modern lawn mowers are difficult to attribute to complex devices. Over time, any mechanism undergoes wear, and therefore parts and assemblies require special attention of the owner. One of the elements of the trimmer is a carburetor, designed to form a fuel mixture and its supply to the combustion chamber. Increased consumption with the correct proportions of gasoline and oil or a drop in engine power indicate the need to adjust the carburetor of the gas trimmer.

Trimmer carb setting

The initial step in restoring the correct operation of the fuel system is to clean the air filter.

Screw trimmer carburetor

Experts recommend rinsing it in a solution of water with detergents after every 10-15 hours. Direct adjustment of the trimmer carburetor is carried out by three adjusting screws:

Adjustment of fuel supply at the minimum turns

Before starting the carburetor adjustment of the gas trimmer, it is necessary to warm the engine to operating temperature.

Fuel Adjustment Screws

To do this, start the engine and at idle let him work 10-15 minutes. At the first stage, with the trimmer working, slowly tighten the screw “L” until the beginning of intermittent operation or until it dies. Next, unscrew the screw by ¼ turn and check the speed of maximum speed. If the lawn mower easily and quickly reaches high speeds, this will be the most economical mode. In most models on the market, the fuel screw “L” is turned clockwise, however, there are trim tabs where the decrease and increase in the mixture flow occurs in the reverse order.

Trimmer idle adjustment

Location of carburetor adjustment screws

The screw “T” (“AT”) serves as a limiter of the reciprocating movement of the fuel shutter and when it is twisted, the engine rpm increases, and turning it off leads to a decrease in the crankshaft speed. Professionals advise adjusting the idling screw of the lawn mowers so that the ICE works a little faster at minimum speed, but the head with the fishing line or knife remains motionless. If it is difficult to start the trimmer “cold” after the manipulations, then it is enough to tighten the “T” screw a quarter of a turn and try to start the engine again.

Adjustment of the screw of the maximum turns of a lawn-mowing

After restoring the fuel supply at minimum speed and adjusting the idle speed, it is necessary to check the stability of the mechanism at an increased speed.

Setting at maximum speed

Adjustment of the motor at high speeds is carried out in order to protect against overheating and reduce hand fatigue when pressing the accelerator key. If the internal combustion engine is unstable at maximum speed, then screw “H” must be slowly turned in to ensure smooth and clear operation.

During operation of the lawn mowers, it may be necessary to adjust the fuel feed screw (“L”) for an optimal set of revolutions.

Tips for repairing a gas trimmer carburetor

Adjusting screw spring

For example, the adjustment procedure described above may not give positive results with an excessively large number of turns at the spring of the mixture feed screw and, as a result, the impossibility of optimally reducing the level of gasoline supplied. To eliminate this, you can independently shorten the spring yourself or purchase a new one in accordance with the instruction manual.

Oil for gas trimmer

So, often the information on mixing gasoline and oil indicated on the bank differs from the instructions in the trimmer’s passport. As a result, a black deposit can quickly form on the spark plug, which leads to a drop in power and an increase in fuel consumption. Therefore, when preparing the working mixture, the recommendations specified in the instruction manual should be followed. In most cases, the proportion for a run-in ICE is 1:25. It is worth noting that many tool owners prefer to cook fuel “by eye”, which will inevitably lead to rapid wear of the piston spit in the event of a decrease in the portion of oil and the formation of soot on the spark plug with an increased amount of lubricating fluid.

Lawn mowing or trimmer, despite its relative simplicity (compared to a car engine), sooner or later fails. There comes a time when a long downtime and restarting the gasoline unit is not enough. You need maintenance. In advanced cases, repair is required, more precisely, the replacement of worn parts with the same new ones. Until you are faced with the need to replace your used parts, carburetor maintenance is required. Cleaning, washing, reconfiguring mechanisms.

Carburetor device

The lawn-mow (lawn-mow) contains a base. An aluminum housing, which houses the rest of the parts, working seamlessly as a whole. There is a diffuser in the carburetor body. A stroke with internal channels through which air is pumped.

Channels branching from the diffuser stroke deliver fuel, with which injected air is mixed, which carries away gasoline vapors. Outside the main carburetor compartment:

Jets;
Mini fuel pump;
A unit that regulates the mixing of fuel with air.

The latter forms the same explosive mixture, ignited in the combustion chamber of the carburetor.

Principle of operation

Fuel injection and filtering procedure in the engine the lawn mowers are next.

Using the throttle, the amount of air supplied to the diffuser is set. The more air is supplied, the more oxygen gasoline needs for combustion, and the more power is released in the form of heat. Heat energy is then converted into mechanical energy.
A diaphragm pump pumps the required amount of gasoline.
Further, gasoline passes through the engine fitting.
Fuel flows through the suction and exhaust valves.
The fuel is filtered using a strainer.
Through the needle valve, it also enters the chamber with the membrane.

The staged operation of the carburetor is as follows.

Air enters the duct with an air damper. The damper sets the desired air flow rate.
In the gas injection unit, the diffuser is narrowed. This is necessary to give a higher air flow rate.
Fuel passes through the compartment with the float and passes the jet, falls into this narrowing of the tube. The float compartment doses gasoline. In this compartment, the pressure is in equilibrium. In a narrowed tube, it goes down. Due to the difference in both pressure values, gasoline also passes through the nozzle.
The accelerated stream sprays gasoline, converting it into aerosol vapors. The resulting gasoline-air mixture is ready for ignition in the combustion chamber.
After passing through the fuel pipe, this mixture is in the carburetor cylinder.

Conclusion: in order to set the required power, first of all you will adjust the rate of fuel combustion using the air damper. If the gap is too small, and the oxygen in such a mixture is less than 10%, the fuel does not burn, therefore, the engine will not start or stall immediately.

In the case of buying a Chinese trimmer, it is worth considering that it differs little from European ones. The same 2- or 4-stroke engine and drive.

However, they save on the quality of parts, forcing the consumer to change them more often. Check what compatible parts non-Chinese companies offer for your device.

Major issues

Malfunctions of the carburetor of the lawn mowing or trimmer, despite the relative simplicity of their elimination, sometimes require a long search by the exclusion method. The main reasons are as follows:

Unsatisfactory quality of gasoline cleaning;
Clogged air filter;
Accumulation of deposits and carbon deposits in the compartments and strokes of the carburetor.

Each of the problems has its own reasons.

Fuel Blower Malfunction

The most repeated failure is wear, rupture of the membrane. As a result, her non-fit. Fuel strokes are not sealed at certain stages of the engine cycle. The reasons here are:

You work too long on the lawn mowing or trimmer without a break;
Low-quality fuel
Exhaust gases enter the pulse channel.

A deformed membrane has several bad consequences:

Not enough gasoline or oxygen in the created combustible mixture;
The motor starts after 10 or more failed attempts;
The engine knocks, clicks during operation, etc.;
The working piston is deformed.

As a result, the internal space of the fuel pump is polluted from the side of the pulse channel.

Strainer clogging

The causes of the clogged strainer are poor fuel cleaning, damage to the hose and / or discharge head.

Failure of the adjustment lever

The wear of the contact face of the lever is a consequence of an incompletely refined fuel, which includes grains of sand or particles of clay, metal or other inclusions insoluble in liquid hydrocarbons. There is a problem with fuel injection, the motor without load is functioning intermittently.

Inlet needle defective

The inlet needle breaks due to the presence of particles of metal and stone in gasoline. As a result, the seat of the inlet needle does not fit snugly against it; the fuel mixture flows. There is too much air in the combustible mixture created by the carburetor, which makes the motor “sneeze” during operation. Finally, the needle can stop due to poor-quality gasoline, or the unit has been idle for a long time.

Clogging the adjustment space

Deposits may accumulate in the adjustment compartment. The needle does not completely cover the hole, and a lot of gasoline enters the fuel chamber. The engine overfills it, possibly it also fills the spark plugs. Because of this, the gasoline-air mixture contains an increased amount of gasoline vapor. Efficiency drops markedly.

Corrupted diaphragm adjustment

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

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

Intake control lever sticks

Jamming of the adjusting lever is a consequence of improper installation, accidental bending. The contacting face will find the wrong position. This will disrupt the additional injection of gasoline.

The damper has worn out

The throttle and air damper become unusable due to the ingress of dust, metal particles, etc. Damaged dampers are similar to sandblasted parts. Due to the wear of the dampers, the motor efficiency is reduced, breakdowns are detected. The piston and cylinder wear out.

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

Carburetor cannot be adjusted

The springs on the adjusting screws are to blame for the fact that the adjustment is too coarse (the parameters cannot be set exactly). The manufacturer of lawn mowers or trimmers can supply unnecessarily thick and stiff springs. You can find others either in workshops where such equipment is repaired, or purchased from any dealer or official representative of the company that produced the motor for your trimmer or mechanical scythe.

The primer broke

Primer. A manual mini-pump for forced pumping of fuel into the carburetor. To successfully start the engine, you may need to pump 20 ml of gasoline manually.

Elimination methods

List of upcoming work with the engine may be as follows:

Fuel pump replacement;
Disassembling and washing 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);
Adjustment of inlet, outlet and needle valves;
Replacement of dampers;
Cleaning of fuel channels and diffuser;
Replacement of screw springs;
Primer change.

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.

Lawnmow carburetor adjustment

Do-it-yourself diagnostics and adjustments to the carburetor can take just a few minutes.

To do everything right, start the engine. Your actions are as follows.

Find idle speed. To do this, unscrew the screw L to the right, and then to the left. Turning step. A quarter of a turn counterclockwise.
Using the T screw, you can adjust the idle speed of the motor: increase when turning the screw clockwise, decrease. Vice versa. The adjusted engine confidently works without load and without warming up. Heated. Does not overstate.
If you do not set up a lawn mowing but a trimmer, then turning the T-screw sets a larger margin in rpm. For both types of devices, stable rpm is set when the knife (or fishing line) selects the cutting height.
The last turn the screw H. It sets the rate of supply of gasoline with air at close to maximum speed, engine power, engine warm-up temperature and fuel consumption.

To adjust the motor with screw H, proceed as follows.

Open the throttle and squeeze the gas at maximum speed.
Turn screw H clockwise until the engine speed is reduced.
Slowly turn the same screw counterclockwise until the engine produces variable speeds.
Turn the screw back a little (clockwise) until the motor runs smoothly. It is important to catch this line.

The result of fine adjustment is the complete combustion of the fuel and the white-brownish color of the spark plug. A gas-filled candle is much darker than a non-flood candle.

How to adjust the carburetor lawn mowers, see below.

Carburetor adjustment and repair

The trimmer does not belong to complex household appliances, so most of its breakdowns are mechanical in nature and can be successfully repaired with their own hands. Even if the engine fails for serious reasons. Damage to the piston ring, for example, repair comes down to replacing the part.

But even with a relatively simple design, such a part of the device as a carburetor needs to be adjusted.

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 accordingly.

The carburetor device for lawn mowers is the same in almost all cases. It belongs to the category of float devices. The latter provide stable parameters of the finished mixtures.

The principle of operation of the module is as follows.

Air enters the body of the tube with an air damper. The latter enhances or reduces airflow depending on its 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 float level determines the amount of fuel supplied. Since the pressure in the chamber is normal and low in the tube 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 the desired density.
The mixture is sucked into the cylinder through a pipe.

The more open the air damper in the tube, the higher the density of the air flow, which means that more fuel enters the cylinder. Setting the carburetor of the lawn mowers is reduced to setting such a ratio of dampers at which the density of the fuel mixture becomes optimal.

Signs of imbalance

Carburetor debugging is necessarily carried out in the manufacture of the apparatus. As a rule, the owners will only learn about the need to adjust the fuel supply themselves after serious failures, 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, but the engine stalls right away. Since the engine can only work when a certain amount of gasoline is supplied, if the fuel is too “poor”, that is, when the feed channel is blocked, the motor will stop;
Too much fuel consumption, a lot of exhaust gases. The result of incomplete combustion of the mixture. In this case, on the contrary, there is too much fuel and the mixture turns out to be excessively dense.

The carburetor of the Stihl, Makita, Husqvarna and others lawn mowers is adjusted using the adjusting screws. Sometimes the reason for the disorder of the work is a violation of the fixation. Due to vibration or damage to the protective cap. Such a breakdown can be detected simply by trying to turn the screw a little: if the fixation is not rigid, it is worth checking the setting.

DIY carburetor adjustment

The configuration of the module does not apply to repair and replacement of spare parts is not required. In this case, a repair kit for the carburetor lawn mowers will not be needed.

There are three screws for debugging:

L. Is regulated first, since it is responsible for supplying fuel at low speeds;
H. He is responsible for the supply of gasoline at high speeds, as well as for fuel consumption and temperature;
T. With its help, idle debugging is carried out.

There are options, as a rule, this is a Chinese lawn mowing carburetor, when there is only one screw left for debugging on the case. To adjust the idle speed. This does not mean that the module is automatically configured. It means that even a type of repair such as debugging will be difficult. In the photo. Carburetor adjustment of the Chinese lawn mowers.

Setting up the module is carried out only when the engine is warm: for this, the device is first turned on for 10 minutes. If the mowing head rotates at idle, then proceed with debugging immediately: turn screw T counterclockwise until the rotation stops.
Adjustment starts with screw L. The screw rotates left and right until it finds its position at which idle speed does not become maximum.
Then turn the screw на turn counterclockwise. This will be his working position.
Idling must be adjusted by turning counterclockwise to increase the speed and clockwise to decrease. Its debugging consists in achieving such a mode in which a sufficient number of revolutions is made before the mowing head begins to rotate. In this case, the engine must work stably in different positions.
The position of the screw L is determined last. At maximum speeds the trimmer should not work for more than 10 seconds. The throttle opens, the screw rotates clockwise, very slowly, until a decrease in the number of revolutions is established by ear.
Then, the screw also rotates slowly counterclockwise until the motor starts to malfunction. Then the screw is turned back clockwise until the engine starts working again normally.

If there is a tanometer, and if the recommended revolutions are indicated in the product passport, the correction can be made more accurate, focusing not on the ear, but on the readings of the device.

The adjustment of the carburetor of the lawn mowers on the was carried out by ear.

Carburetor Adjustment Lawn Mowers: Highlights

One of the elements of the trimmer is a carburetor, designed to form a fuel mixture and its supply to the combustion chamber.

Increased consumption with the correct proportions of gasoline and oil or a drop in engine power indicate the need to adjust the carburetor of the gas trimmer.

Trimmer carb setting

The initial step in restoring the correct operation of the fuel system is to clean the air filter.

Screw trimmer carburetor

Experts recommend rinsing it in a solution of water with detergents after every 10-15 hours. Direct adjustment of the trimmer carburetor is carried out by three adjusting screws:

Fuel feed adjustment screw (“L”);
Adjustment screw at high speeds (“H”);
The screw responsible for idling the motor (“T” or “AT”).

Adjustment of fuel supply at the minimum turns

Before starting the carburetor adjustment of the gas trimmer, it is necessary to warm the engine to operating temperature.

Fuel Adjustment Screws

In most models on the market, the fuel screw “L” is turned clockwise, however, there are trim tabs where the decrease and increase in the mixture flow occurs in the reverse order.

Trimmer idle adjustment

Location of carburetor adjustment screws

Professionals advise adjusting the idling screw of the lawn mowers so that the ICE works a little faster at minimum speed, but the head with the fishing line or knife remains motionless.

If it is difficult to start the trimmer “cold” after the manipulations, then it is enough to tighten the “T” screw a quarter of a turn and try to start the engine again.

Adjustment of the screw of the maximum turns of a lawn-mowing

After restoring the fuel supply at minimum speed and adjusting the idle speed, it is necessary to check the stability of the mechanism at an increased speed.

Setting at maximum speed

During operation of the lawn mowers, it may be necessary to adjust the fuel feed screw (“L”) for an optimal set of revolutions.

Tips for repairing a gas trimmer carburetor

Regardless of the manufacturer, there is a factory defect of the carburetor parts of the lawn mowers.

Adjusting screw spring

Many owners of lawn mowers when buying oil follow the recommendations indicated there for the preparation of the fuel mixture.

Oil for gas trimmer

Therefore, when preparing the working mixture, the recommendations specified in the instruction manual should be followed. In most cases, the proportion for a run-in ICE is 1:25.

It is worth noting that many tool owners prefer to cook fuel “by eye”, which will inevitably lead to rapid wear of the piston spit in the event of a decrease in the portion of oil and the formation of soot on the spark plug with an increased amount of lubricating fluid.

The correct tips for setting up the trimmer carburetor correctly performed above will help to avoid not only engine overheating and increased fuel consumption, but also significantly increase the life of other parts and components of the tool. Pay attention to the operation of the lawn mowers in all modes and timely carry out regulated maintenance and repair of the tool.

Carburetor Adjustment Lawn Mowers: Highlights was last modified: June 25th, 2018 by Administrator

About carburetor adjustment of lawn mowers: how to adjust and adjust with your own hands

Adjusting the carburetor of the lawn mowers is a process that must be mastered for the trimmer to work properly.

The trimmer is a completely uncomplicated device that can break down only in a few places and require mechanical repair or replacement of the part.

Adjusting the carburetor device for a float-type lawn mower may require knowledge of certain subtleties. The nuances caused by the model and the specifics of its functioning will ensure a clear mode of mixing and supplying the fuel mixture.

What is the problem of trimmer malfunction

Champion lawnmower carburetor how to adjust? This is just a float type trimmer. A common option designed to mix air and fuel in the prescribed proportions. The main problems that arise when the engine is running are approximately similar to the problems that overtake the carburetor in the car:

The motor may stall immediately after it has been started. The reason is that gasoline is not supplied enough. This is called “poor” fuel;
Excessively supplied gasoline leads to incomplete combustion, excessive mixture density and uneconomical consumption.

Important! It is necessary to regulate the carburetor under different circumstances: changes in temperature, octane number of fuel or type of oil, after winter or at the end of the break-in period, load or spontaneous cranking of screws from strong vibration of the case. Some owners prefer to configure the module before each use to make sure that it works correctly.

Trimmer device

Spare parts for cultivators

The float carburetor consists of an aluminum body with a hole (diffuser). Air is pumped through its passage opening, and gasoline is drawn in through the fuel channels along with the air stream. This is the basis of the device. The fuel chamber. Mounted on top of the nozzles, pump and adjustment system of the mixture provide not only its saturation, but also a uniform flow.

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

How to adjust the trimmer on the lawn mower

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

L. For fuel supply of a low-speed mode;
H. Fuel supply at high speeds and its consumption;
T. Idle debugging.

Adjusting the lawn mowers, whose production is Chinese, can cause difficulties due to the presence of only one screw, which is responsible for idling.

Important! The answer to the question of how to adjust the Champion lawnmower carburetor is better to look at the where the professional does it.

Carb Adjustment on Patriot Trimmer

The Patriot trimmer carburetor is adjusted by ear screws. Not a single verbal explanation will give a complete picture of how this is done, so it’s better to watch the tutorial.

After proper adjustment, the engine must increase speed, and when idling, the cutting tool will not turn. Everything is easy and simple!

DIY trimmer trimmer trimmer carburetor

Lawn mowers, like all gasoline tools for mowing grass, are not considered difficult to maintain equipment. They can and should be set up, repaired with their own hands. So, for example, in five minutes of your free time, you can adjust the trimmer carburetor.

Often, to adjust the engine, you need to adjust the gas supply, and this is done precisely by the carburetor of the lawn mower. Such a device requires special attention. If used improperly, it may refuse to work or will perform its functions with errors and with high power consumption.

Today we will analyze the main causes of failure and step-by-step adjustment of the part with our own hands.

How is the carburetor of a lawn mower?

What is a carburetor? This is a complex part in the system of operation of a mechanical device. In any model, air and gas are mixed for future supply to functioning cylinders.

Important! The most high-quality and recommended lawn mowers can be safely called the devices of such brands: Husqvarna, Hyundai, Stihl, Zama, Walbro.

The engine of the lawn mowers is based on an aluminum base, which has a diffuser (a recess with internal restrictions). It is through this recess that the air currents are heated. The oxygen delivery rate directly depends on the passage of the diffuser.

Fuel paths are adjacent to the diffuser. Gasoline is drawn in through it through the air stream. But on the outside of the engine, the following parts are installed:

Fuel pump.
Jet system.
The system for adjusting the ratio of gasoline to air.

Important! The air density in the carburetor depends on the volume of the flap open to access. The more the damper system is open, the more the unit consumes gasoline and the higher its power. That is, setting the carburetor on the trimmer is to create the optimal fuel intake due to the correct air supply.

When do I need to adjust the carburetor in the trimmer?

You need to configure the device in such cases:

The new engine used 5 liters of fuel mass in one go.
The weather has changed (a sharp drop in atmospheric pressure).
You bought another brand of oil or gasoline.
During long-term storage.
After vibration, the screws unscrew themselves.
The consumption of gasoline increased, the carburetor began to pour fuel.
The appearance of carbon deposits on the electrodes of the inner candle of the device.
Gas stopped flowing into the cylinders.
The motor often stalls or does not gain enough speed.

What are the failures and how to recognize them?

One of the problems with the failure of the trimmer engine can be a strainer. Only two breakdowns can be attributed to this element:

The accumulation of dust and dirt.
Partial or complete failure.

To identify the exact cause, you need to do a number of the following:

Unscrew the cover of the fuel air lock to remove the strainer. If dirt is found on the part, rinse it with fuel or blow it thoroughly. If you see serious damage to the filter housing, without hesitation you need to install a new one.
If the pipe for supplying compressor fuel is broken, then check this part. Most often, it requires periodic replacement due to its low strength.
To clean the starting part of the carburetor from blockages, you need to use acetone or gasoline. You can also blow component parts with compressed air. This is the easiest and most convenient way to repair.

Important! The throttle base, intake and exhaust valves, the joints of all carburetor parts can be checked with a simple action. Grease the problem area with soap foam.

Self-adjusting carburetor trimmer

Before setting up the mower device, we recommend that you do the following:

Clean and flush the engine.
Check the spark plug for suitability.
Remove dust and dirt from the air filter or change it to a new one.
Put a cord suitable for the diameter in the trimmer roller or install well-sharpened knives.

After installing the cutting parts and starting the fuel engine, the carburetor needs to warm up for 10 minutes. If the cutting tool rotates while the engine is idling, reduce the engine speed.

Adjusting the carburetor on the trimmer is a difficult and time-consuming job. To correctly configure it, you will have enough information from our informative article. And to do everything accurately, use the, which clearly shows the whole process.

Carburetor for trimmer. Device, do-it-yourself adjustment

The stable and effective operation of the household trimmer is largely dependent on the quality of the fuel used by its operator. The filled fuel mixture must be enriched with air. For this, the built-in carburetor is responsible for this in the basic lawn mowing device. This node is one of the main elements of the braid, so the operator must constantly monitor its serviceability and settings. Otherwise, the trimmer will lose its performance and may completely fail.

The device of the carburetor lawn mowers

The standard design of any gas trimmer must include a fuel system, the basis of which is the action of a standard carburetor. Its structure 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 housing that protects the internal components of the assembly from moisture, small debris and dust. A built-in diffuser is provided in the lower part of the body, 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 assembly to enrich the fuel. The diffuser operates according to 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 carburetor of the lawn mowers includes a throttle, the main task of which is to regulate the amount of intake air. The greater the amount of air, the higher the rated power of the trimmer power unit. Another function of the damper is to facilitate the cold start of the engine. If the lawn mowing is started for the first time after a long period of inactivity, the shutter must be closed. Immediately after starting the motor, the part must be opened, otherwise the engine will die out.

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

The membrane of a regular carburetor takes an active part in fuel suction. It enters the fuel assembly through the fitting. After that, the fuel passes through the built-in intake and exhaust valves, then through the strainer and the fuel pipe. Then the fuel flows next to the needle and gradually fills the chamber equipped with a control membrane.

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

When is the carburetor adjustment of a household trimmer required?

Adjust the built-in trimmer carburetor when:

Running-in of a new engine, during which from 4 to 5 liters of fuel mixture were used;
Sudden changes in weather;
Changes in rarefaction of air. For example, when the lawn mowing is often used in mountainous areas;
Long simple trimmer;
Intensive growth of loads on the power unit of lawn mowers;
Arbitrary unscrewing of the carburetor’s built-in adjusting screws. This becomes the cause of increased vibration of the internal combustion engine;
Changing the quality of the components of the fuel mixture;
Fuel transfusion with a carburetor, resulting in an increase in fuel consumption;
Regular appearance of a thick layer of tarry deposits and soot on the surface of the electrodes of a regular trimmer spark plug;
Engine start and its arbitrary shutdown or a slow set of revolutions;
The lack of fuel in the cylinder of the power unit;
Increase in exhaust emissions.

The lack of timely adjustment of the carburetor threatens serious damage to the trimmer, up to the complete failure of its factory engine.

DIY carburetor adjustment

Periodic adjustment of the trimmer carburetor should be performed on a serviced and fully functional power unit. Before starting the procedure, the operator must thoroughly rinse the engine parts and inspect its CPG for any burrs or other defects. In addition, you will need to clean or replace the spark plug, as well as rinse the filter elements in the construction of the lawn mowers.

During carburetor adjustment, the lawn mowing engine must run under a certain load. It is best to install a cord of the appropriate diameter or cutting knives on the trimmer.

After mounting the cutting organs, the operator should start the internal combustion engine trimmer and leave it to work for about 10 minutes. If during operation of the power unit at idle it was noticed that the cord or knife rotate, then you need to reduce the speed created by the motor. To do this, turn the lower control, often denoted by the letter “T”, to the left, until the installed cutting unit stops completely.

A 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 while the engine is operating at low revs. The position of this screw must be set first. To do this, the operator will need to achieve maximum engine speed when idling. For this you need to turn the screw “L” in turn to the right or left side. Once the maximum speed is reached, the screw will need to be rotated 1/2 turn to the left;
Screw “T” or “LA” is required to adjust the idle speed. During its rotation to the left, the revolutions of the power unit will decrease, and when turning to the right. Accordingly, increase;
The “H” regulator, provided on the left, is responsible for enriching the fuel mixture with air during the operation of the engine trimmer at high speeds. This screw is also needed to adjust motor power and fuel consumption. Its position is adjusted by turning the screw to the right or left side until the maximum permissible engine speed is reached. After that, screw “H” will need to be turned 1/2 turn to the left.

The sequential implementation of these actions will allow you to correctly configure the trimmer fuel assembly, without the risk of exceeding the permissible load on its main operating mechanisms.

Do-it-yourself carburetor adjustment for lawn mowing

Lawn mowing carburetor is a unit 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.

The main problems and malfunctions of the carburetor

Strainer There are only two problems with this element:

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.

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).

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

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.

The device of the carburetor lawn mowers

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 the carburetor lawn mowers

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

Phased operation of the device:

Air supply to the tube with an air baffle (damper). The partition controls the intensity of the air flow.
The fuel supply system must be narrowed by a diffuser to increase the flow rate.
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.
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.
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 lawn mower is creating the optimal fuel mixture due to the correct air supply.

How to adjust a carburetor on a lawn mower

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

Further tuning of the carburetor of the lawn mowings with your own hands is done by adjusting screws. There are three of them:

Right (L). Adjustment of the fuel mixture for low revs.

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

Bottom (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). Adjustment of 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.

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

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).
Turn the screw as slowly as possible counterclockwise until the engine runs unevenly.
Then turn back quite a bit, barely hearing stable, smooth operation.
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, 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.

Carburetor adjustment of lawn mowers in practice.

How to Adjust Carburetor Lawn Mowers

Do-it-yourself carburetor adjustment for lawn mowing

Lawn mowers, like all gasoline powered tools for the garden, are not difficult to maintain. It is possible and necessary to repair, configure without the help of others. For example, do-it-yourself carburetor adjustment for lawn mowing is a matter of 5 minutes.

Lawn mowing carburetor is a unit in the power system. 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.

Device carburetor lawn mowers

The base of the carburetor of the lawn mowers is a duralumin case. It contains a diffuser (a hole with internal contours). Air is blown 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. Fuel is drawn from them by an air stream.

Outside the carburetor is installed:

Fuel pump;
Jet system;
Fuel consistency adjustment system with air;

Carburetor adjustment of lawn mowers in practice

Lawnmowing carburetors can be purchased here: How to adjust carburetor, if it is configured

Carburetor adjustment of Chinese lawn mowers. Practice

The correctness of the option carburetor determined by the operation of the motor and the color of the candle. Adjusted

Phased operation of the device:

Air supply to the tube with an air baffle (damper). The partition controls the intensity of the air flow.
The fuel supply system is certainly narrowed by a mixer to speed up the flow.
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 small. Due to the pressure drop, fuel leaks through the nozzle.
The acceleration of the air flow contributes to the transfer of fuel (gasoline) and its atomization. Ultimately, an air-fuel mixture of the desired proportion or density appears.
The air-fuel mixture seeps into 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 lawn mower is creating a good fuel consistency due to the correct air supply.

How to adjust carburetor lawn mowing

Before adjusting, you must carefully clean the filters according to the maintenance in the annotation.

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Upcoming carburetor trimmer lawn mowers do it yourself made by adjusting screws. There are three of them:

Right (L). Adjustment of fuel consistency for low revs.

It is necessary to find the highest idle speed. To do this, slowly unscrew the screw (L) to the right and left.

To adjust, turn the screw a quarter turn without fail counter-clockwise arrows.

Bottom (T). Is responsible for adjusting the engine at idle.

Clockwise. Increase;
Counterclockwise. Decrease.

For the correct adjustment of specific idling, it is characteristic:

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). Adjustment of 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.

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

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).
Turn the screw as slowly as possible counterclockwise until the engine runs unevenly.
Then turn back quite a bit, barely hearing stable, smooth operation.
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, the setting (its correctness) is determined by the color of the candle, and not just by the speed and stability of the engine.

Trend Source: https://evdiral.ru/kak-regulirovat-karbjurator-motokosy/

Carburetor trimmer, trimmer trimmer

Carb adjustment

Fuel mixture adjusting screw.
Idle adjustment screw.
The screw limits the maximum speed.

Start the lawn mower and wait until it warms up.

Fuel adjustment

Idle adjustment

Maximum speed limit

After adjusting the flow of the fuel mixture and low revs, check how the lawn mowing engine will operate at maximum speed. If necessary, limit the maximum speed to the required level using the No. 3 hollow screw. Loosen the locking nut and screw in to decrease the maximum speed or unscrew to increase. After adjustment, tighten the nut. Setting the maximum revolutions is necessary to protect the trimmer motor from overheating and the possibility of using the start key lock to reduce fatigue of the right hand. In the future, it may be necessary to adjust the trimmer carburetor. For example, if the engine, when operating at full load, starts to pick up revs poorly, loosen screw No. 1 another quarter of a turn. If it is difficult to start, increase the idle speed. Weather conditions and the quality of the fuel mixture can affect the operation of lawn mowers. The vibration can also make the adjusting screws turn themselves.

The spring may interfere

My first attempt to adjust the carburetor of the lawn mowers did not work, as the spring of the fuel mixture adjustment screw prevented it. The factory spring turned out to be too thick in a compressed state and did not give the opportunity to reduce the fuel supply to the required level. I had to pick up another spring and continue adjusting after replacing it. Fuel mixture adjustment screw with spring The factory spring is in the photo above, and the adjustment screw with a selected spring is at the bottom. I am writing about this, because I’m not sure that this is an isolated case, and someone else may encounter the same situation.

Lawn mowing or trimmer

A trimmer is a broader concept than a lawn mow (lawn mow), since it can also be electric. A gas trimmer and a lawn mower are one and the same thing. Some authors claim that the trimmer is a weaker tool than the more powerful lawn mowers, which can be used to mow shrubs. Personally, I have a tool with a maximum power of 1.7 kW and capable of mowing a small shrub up to 10 mm thick, as stated in the instructions. The user manual is called “Petrol trimmer.”

Fuel mix ratio

I read somewhere that if the proportions for preparing the fuel mixture are indicated in the instruction manual for the lawn mowers and on the oil canister, the proportion indicated in the manual should be used. Carbon deposits formed, since the manual indicated the proportion for the engine being run in 1:25, and on the canister. 1:50. After the transition to a proportion of 1:50, the appearance of oil drips stopped. The candle continued to burn, but with less intensity (the carburetor has not yet been adjusted). Until now, some users of a gasoline tool determine the proportion of the fuel mixture “by eye”. If during the preparation of the mixture the amount of oil is underestimated, after some time an extraneous sound may appear immediately after the engine starts, gradually disappearing during warming up, and the engine stops with a sharp jerk. Continued operation of the trimmer in this mode will lead to its failure.

Candle cleaning

In the worst days of working with a trimmer with an unregulated carburetor, the engine stopped starting after using each fuel tank. And only after cleaning the candle from soot could we continue to work. To clean the electrodes, we used fine sandpaper, and to clean the space between the insulator and the body, we used a thin clerical clip with a bent end. First, the electrodes were wiped off with a lot of dirt with a rag, then they were cleaned with sandpaper. After that, the candle was lowered into diesel fuel and the moistened soot was scraped off with a paper clip from the surfaces of the insulator, the inside of the housing and between them. Further, the candle was lowered several times in diesel fuel, which was then shaken off from it along with impurities. Sometimes the cleaning procedure with a paper clip and washing are repeated. After that, the candle was wiped dry and was ready for further use. It is incredible, but one tank of the fuel mixture with an unregulated carburetor can be consumed in less than 10 minutes. It was tested in practice when the trimmer was started and operated at high speeds with maximum fuel supply (adjusting the screw was loosened much more than normal).Other articles on this topic:Lubrication of the lawn mowing shaft, trimmerSource: https://vremya-ne-zhdet.ru/sad-i-ogorod/regulirovka-karbyuratora-benzokosy-trimmera/

Carburetor for lawn mowers. Device, adjustment

Each gas trimmer is equipped with an internal combustion engine. The lawnmowers motor needs special attention since the stable operation of all the mechanisms of a garden tool largely depends on its proper setting. The adjustment of the motor, in turn, consists in adjusting the quantity and quality of fuel entering the cylinder. For this, a carburetor is provided in the trimmer device.

Carburetor principle

The lawn mowers carburetor is constantly working on the same principle.The functioning of the node is as follows:

First, as a result of the suction stroke of the air by the motor, a certain vacuum is created in the diffuser, which leads to the suction of air masses;
At the same time, fuel leaks through the nozzles from the combustion chamber, which is subsequently mixed with air. After enrichment with air, gasoline gradually begins to disperse, as a result of which an air-fuel mixture is formed;
Next, the finished mixture enters the engine cylinder, where the piston acts on it. At the top of the piston lift, the fuel is ignited by the spark generated by the lawn mowing spark plug;
Due to the fact that the internal cavity under the membrane is connected to the air from the environment through a channel, the valve opens when the membrane is raised. This causes air to enter the cavity under the membrane;
As soon as the chamber is filled with fuel mixture, the membrane quickly returns to its original position. The valve also closes.

The operation scheme of the unit is repeated constantly, throughout the entire cycle of operation of the garden trimmer.

When is carburetor adjustment required?

The stable operation of the carburetor lawn mowers largely depends on its proper settings.Node adjustment is required in the following cases:

After running in a new trimmer, when 4–5 full fuel tanks were consumed during operation;
When the operator frequently replaces the brand of gasoline used for refueling;
As a result of a sharp change in weather;
Due to prolonged storage of the trimmer;
As a result of the arbitrary unscrewing of the adjusting bolts of the lawn mowers, caused by the strong vibration of its motor;
Due to a sharp increase in the amount of fuel consumed by the trimmer.

It will also be necessary to adjust the carburetor of the mower in cases where carbon deposits quickly appear on the spark plug of the tool, as well as with a sharp increase in the volume of exhaust gases emitted by the trimmer.

Carburetor for trimmer. Tuning, do-it-yourself adjustment

Carburetor for trimmer. One of the most important units of the unit, which is responsible for the fuel mixture. If the equipment is improperly handled, the element may be damaged, which is why it is impossible to operate the lawn mowing without repair. To repair a garden tool, you need to know about its structure, the principle of operation and the rules of adjustment.

Design features and the principle of operation of the carburetor lawn mowers

Structurally, carburetors from well-known brands and Chinese manufacturers are practically no different.

The device of the carburetor lawn mowers consists of the following elements:

Booster pump;
Atmospheric membrane tuning systems;
Primer, facilitating the start of the motor;
Cold running systems;
Elastic two-valve plate;
Metered system with a rotating rotor;
Throttle

The model operates as follows:

From the air damper, air passes into a tube, which increases or decreases its flow;
In the area with an opening for the fuel mixture, the narrowed zone is the diffuser. In this zone, air moves faster;
The fuel mixture from the float compartment through the nozzle enters the tube. The amount of fuel is determined by the float;
With enhanced airflow, fuel is picked up and sprayed. An air-fuel mixture with sufficient density is created;
It sucks the mixture with a cylinder through the pipeline.

The concentration of the air flow depends on how slightly the airlock is open, and accordingly, more fuel is supplied to the cylinder. The regulation of the carburetor of the lawn mowers is to set the correct ratio of the dampers to achieve the optimal consistency of the fuel mixture.

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.

How to adjust the carburetor lawn mowers do it yourself?

Before setting up the carburetor assembly, a certain algorithm of actions is performed:

The motor is washed;
The spark plug is replaced or cleaned;
The air filter is replaced or cleaned. It can be dipped in warm soapy water, after the filter is completely dried;
A cord or knives are installed in the trimmer coil to increase the load on the power plant during tuning. The gas engine should run idle for at least ten minutes.

If the cutting headset continues to rotate at idle, it is worth reducing the speed of the power plant. The screw T is adjusted, on some models it is marked LA. The idle speed control is twisted counterclockwise until the cutting element stops moving.

Trimmer carburetor adjustment depends on three screws:

L is responsible for the level of pumping the fuel mixture at reduced speeds. It is set up first. It is necessary to achieve maximum speed by unscrewing the screw to the desired point. After the regulator turns a quarter of a turn to the left;
T (LA). Sets idle operation. When you turn the screw to the left, the engine speed decreases, to the right. Increase;
H allows you to enrich the fuel at maximum speed. The screw adjusts high speeds, fuel economy and power plant power level.

The motor cannot run at full speed for more than 10 seconds, as it can break.

Eliminates engine damage proper tuning:

With the engine running, give full throttle;
The screw N is unscrewed clockwise until the unit starts to slow down;
Knob H rotates to the left until the motor is stable.

If you follow all the instructions, the carburetor for lawn mowing is considered tuned: the engine runs at the required speed, a little fours at high speeds, the cutting elements do not rotate without load.

Do-it-yourself carburetor adjustment for lawn mowers. Special machinery

Self-adjustment of the carburetor of the lawn mowers with your own hands is impossible without preliminary work, knowledge of the theory, awareness of the device of the fuel system. Carburetor repair annotation.

Do-it-yourself carburetor adjustment for lawn mowing

Lawn mowers, like all gasoline powered tools for the garden, are not difficult to maintain. Carburetor Stihl carburetor adjustment. Setting the carburetor lawn mowers Kraft. It is possible and necessary to repair, configure without the help of others. For example, adjustment carburetor lawn mowers do it yourself. A matter of 5 minutes.

Lawn mowing carburetor is a unit in the power system. 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.

The base of the carburetor of the lawn mowers is a duralumin case. It contains a diffuser (a hole with internal contours). Air is blown through this hole. Carburetor Cleaning Lawn Mower mtd. The oxygen (air) flow rate depends on the cross-section (passage opening) of the diffuser.

The diffuser is equipped with fuel channels. Carburetor adjustment for Patriot petrol trimmer. Fuel is drawn from them by an air stream.

Outside the carburetor is installed:

Fuel pump;
Jet system;
Fuel consistency adjustment system with air;

Carburetor Adjustment Lawn Mowers

Adjustment and carburetor repair

But even with a relatively simple design, such a part of the device as a carburetor needs to be adjusted.

Husqvarna Trimmer Carburetor Adjustment

Adjustment carburetor lawn mowers can do it yourself

Lawn mowers, like all gasoline powered tools for the garden, are not difficult to maintain. It is possible and necessary to repair, configure without the help of others. For example, carburetor adjustment do it yourself. It’s 5 minutes.

Lawn mowing carburetor is a unit in the power system. Carburetor adjustment At this Husqvarna adjustment Well, there will be a trimmer. In it, like all carburetors, there is a process of mixing air and fuel (gasoline) for the upcoming supply to the engine cylinders.

: Replacing the shock absorber of the front pillar

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

Source

Grass Trimmer adjust, fuel, trimmer