Power systems of modern cars with eachyear become more complicated, but a simple, affordable and reliable carburetor will serve the owners of the old cars for a long time. Now carburetor cars have not been produced for a long time. But this does not eliminate the need for maintenance of such machines. For example, the carburettor "Solex" 21073 manufactured by the Dimitrovsky auto-aggregate plant is still manufactured and successfully operates in the power supply systems of the classic VAZ engines, as well as the front-drive VAZ 2108, 2109. It can also be found on the early models of the "tenth family".

Despite the simplicity, this element is useddemand and popularity among motorists. Not only the "Niva" was installed "Solex" 21073. Reviews about it are positive, which means you need to learn more about it and learn how to set it up.

Carburetor Solex: modifications

The basic design of these devices was developed by the engineers of the French company Soleks.

sollex 21073

At the Dimitrovgrad plant, we later receivedlicense for production, and all other modifications were made by specialists here. A popular Solex 21073 was developed at the DAAZ. Reviews about it are only positive. The mechanism is easy to set up and is highly reliable. DAAZ-2108 is designed to work with a 1.3 liter engine for VAZ 2108 and 2109. Solex 21083 was modified for 1.5-liter power units. The same mechanisms were equipped with models from the first parts of the VAZ 2110 with an ignition system based on a microprocessor. On the classic VAZ models were installed "Solex" 21053-1107010. Models VAZ "Niva" were equipped with the mechanism "Solex" 21073-1107010. Now he was replaced by an injector.


The carburettor "Solex" 21073 is of the typeemulsion. Modifications to it were initially installed on motors with non-contact ignition. The device is characterized by the presence of two chambers equipped with throttle valves, as well as dosing systems. Also, the device has transition systems for the first and second cameras. There is an idling system, but only for the first camera.

sollex 21073 reviews

The mechanism is two halves. Lower - more massive - and upper. The given half is directly the case of the device, and the top part is for a carburettor a cover. At the bottom of each chamber there are flaps of rotary type with a mechanical type of drive. At the top in the first chamber of the carburetor is a damper for air supply. It is necessary for launching an unheated power unit. This part is operated by a cable that goes into the interior and is connected to the lever responsible for the suction and with the starting vacuum system.

Operating principle

The "Solex 21073" works as follows. Gasoline will get into the float chamber with the help of the inlet fitting - the fuel also passes through the filter net, where it is cleaned, and goes through the needle valve. The chamber with a float is two-sectional, and the sections are connected together. They will have the same amount of gasoline. This design significantly reduces the effect of body tilts on the fuel level in this chamber.

sollex adjustment

This ensures a more stable operationengine. As the chamber fills up, the float, pressing a part of the needle valve, blocks the access of fuel to the chamber. So the constant level of gasoline in the mechanism is maintained. Then, from the float chamber, gasoline passes through jets into the mixing wells. Air enters into these wells through special openings in emulsion tubes or air jets. Then they mix gasoline and air. As a result, a fuel mixture is formed. It will fall into the small as well as into the large diffusers of the device. This is the main dosing chamber. Depending on the mode of operation of the engine, various mechanisms and systems can be started in the carburetor. When the owner tries to start the engine "on the cold" in order to enrich the fuel mixture, a launch device enters the case. His driver starts from the salon - it's suction.

carburettor 21073

When the handle is maximally extended, the airThe damper of the first chamber is completely closed. Together with this, the throttle valve in the first chamber opens up to the distance of the starting gap. It is adjusted by means of an adjusting screw on the carburetor "Solex". Adjusting the clearance will allow you to adjust the idle speed.

Starting system

This mechanism is a specialThe cavity that connects to the intake manifold. Also in the device there is a diaphragm and a rod, which is connected with an air damper. After the motor is started, a vacuum arises in the intake manifold. It acts on the diaphragm rod, thereby opening the air damper. If the suction handle is returned to the normal position, this will result in a reduction in the starting gaps.

solex on the field

The parameters of the gaps depend on the geometriccharacteristics of the lever and are not adjusted in any way. As for the throttle valve of the second chamber, when the suction is pulled out, it is in the blocked state.

Idling system

This node is necessary in order to supplycombustion chamber with a combustible mixture at the lowest possible speed. Thanks to this system, the power unit will not stall when there is no load. Fuel in the system will fall on the main jet in the first chamber. Through the nozzle XX, where it then mixes with oxygen, the fuel enters the system through the air valve. This mechanism allows to ensure stable operation of the engine at idle speed without load.

Further, the combustible mixture will enter the first chamber througha special channel located under the throttle. The fuel mechanism leading to the outlet port XX is closed with a quality screw. This is an adjusting screw, which can be adjusted and changed the characteristics of the carburetor. The work of the engine in idle mode on the mechanism "Solex 21073" is also adjusted by this element. Due to it, the throttle valve clearance value of the first camera in the XX mode is determined.

Other carburetor assemblies

Also in the mechanism of the mechanism there is an accelerating pump and an economizer. These units are intended for the fuel mixture of the engine, when it operates under loaded conditions.

Level adjustment in the float chamber

So, we looked at the Solex device. Adjustment of the carburetor will help to set the optimum mode when the engine will work as efficiently as possible and at the same time the fuel consumption will not be too high. First you need to start and warm up the motor a little. Then, remove the fuel hose and carburetor cover. After disconnect the suction cable and twist the lid off the device.

sollex 21073 1107010

It must be removed as accurately as possible andneatly, so as not to damage the float. Then the ruler or caliper is used to measure the distance in each chamber. It is necessary to measure from the landing planes to the edge of the gasoline. This size should be about 24 mm. If it is larger or smaller, then the parameter is adjusted by bending the float. Then the device is reassembled, the engine is turned on and warmed up.

Idling adjustment

Many car owners, namely beginners, more oftenjust buy old cars and do not know how to adjust the carburetor correctly. As a result - power losses, high fuel consumption, floating speed and other problems. After the level adjustment is successfully completed, idle setting is set. Before doing so, it is recommended to muffle the engine. To work, you need a flat-blade screwdriver and time. There is an opening on the sole of the mechanism. There is a screw in it that is responsible for the quality of the mixture. It screwed in as far as it will go. However, do not strongly zealous.

how to adjust the carburetor

Then, from the most extreme position, screwunscrew it for five turns. Then the engine starts without a suction. Unscrew the quality screw - the carburetor 21073 will regulate the engine speed. Then the element is screwed in again. It is necessary to rotate until the power unit is as stable as possible. Rotate the screw slowly. When the work of the motor becomes quieter, it is twisted by no more than one turn. As a result, idle speed is about 900. But if the engine stalls, they are slightly enlarged.


These are the most important rules for how to set upcarburetor "Solex" (on the "Niva" he goes or to the "seven", it does not matter). Adjustment allows to improve the work of the motor, to stabilize idle speed. This carburettor is good because it can be adjusted with a minimum set of tools in any conditions. But the time goes on, and cars with this type of power system is becoming ever less.

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