Cleaning The Carburetor Trimmer

Carburetor for trimmer: device, do it yourself setting
When is the carburetor setting of the household trimmer required? Carburetor device lawn mowers, do it yourself carburetor adjustment

Carburetor for trimmer: device, do it yourself setting

Stable and efficient operation of a household trimmer largely depends on the quality of the fuel used by the operator. The filled fuel mixture must be enriched with air. A built-in carburetor is responsible for this in the basic device of the lawn mower. This knot is one of the main elements of the streamer, so the operator must constantly monitor its serviceability and settings. Otherwise, the trimmer will lose its performance and may completely fail.

Lawn mowers carburetor device

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 housing 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 zone 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 lawn mowers carburetor device 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 motor, 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 cylinder of the motor 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 near the needle and gradually fills the chamber equipped with the control diaphragm.

The standard carburetor trim valve is connected to the diaphragm with a lever. Below the built-in membrane 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 weather;
• Changes in 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 slow set of revolutions;
• Lack of fuel flow into the cylinder of the power unit;
• An increase in the volume of emitted waste gases.

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

Assembling the carburetor

Assembling a lawn mowers carburetor is a snap. It is necessary to perform all actions in reverse order:

Step-by-step instructions for repairing the carburetor lawn mowers

Step 14

In addition, the bubble button for manual fuel pumping may fail. The impact of gasoline on it leads to the fact that during prolonged operation, the rubber corrodes and it begins to stick together or, under the influence of low temperatures, for example, during storage, it bursts. The button should also be replaced if necessary. In addition, its cost is small and will not affect the size of the repair budget in any way.

Based on the foregoing, it can be concluded that there are only three main carburetor malfunctions: clogging of channels, contamination of the fine filter and failure of components. In the first two cases, cleaning is enough, and in the third, a repair kit will help.

Fuel ratio

I read somewhere that if different mixing ratios are indicated in the lawn mower’s manual 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 constantly formed on the spark plug, since the manual indicated the proportion for the run-in engine 1:25, and on the canister. 1:50. After switching to a 1:50 ratio, the appearance of oil drips stopped. The plug continued to burn, but with less intensity (the carburetor was not yet adjusted).

Until now, some users of gas-powered tools determine the proportion of the fuel mixture “by eye”. If the amount of oil is lowered during the preparation of the mixture, 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 result in its failure.

Carburetor 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 start adjusting. The photo shows the PRORAB-8406 petrol trimmer carburetor as an example. The numbers indicate the adjusting screws that we will use.

Prorab-8406 petrol trimmer carburetor adjusting screws

Purpose of adjusting screws:

1. Fuel mixture adjustment screw.
2. Idling adjustment screw.
3. Maximum speed limiting screw.

Start a lawn mower and wait for it to warm up.

Idle speed adjustment

We start adjusting low speed. Screw number 2 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 a little 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.

The main problems and malfunctions of the carburetor.

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

1. Blockage.
2. Breaking.

In order to find out the cause of the breakdown, the fuel filter cap is unscrewed to remove the strainer. If dirt just accumulates on it, then flushing in gasoline or blowing will help.

If there is visible damage to the mesh filter, it is imperative to install a new one. There may also be damage to the fuel supply pipe (during repair, they practice checking this element).

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

Blowing compressed air into clogged carburetor parts is an acceptable and convenient repair practice.

Lawn mowers carburetor device

The basis of the carburetor for lawn mowers is an aluminum body. It contains a diffuser (hole with internal contours). Air is blown through this hole. The flow rate of oxygen (air) depends on the cross-section (orifice) of the diffuser.

The diffuser is equipped with fuel channels. Fuel is drawn in from them using an air stream.

Outside the carburetor is installed:

• Fuel pump;
• Jet system;
• Fuel-air mixture control system;

Do-it-yourself lawn mowers carburetor adjustment

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

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