DIY carburetor repair VAZ 2103

In detail: do-it-yourself repair of a VAZ 2103 carburetor from a real master for the site my.housecope.com.

The operation of each automobile engine depends on the quantity and quality of the air-fuel mixture prepared by a special device called a carburetor. All carburetor systems create a mixture and help distribute it evenly throughout the cylinders. There are different ways to mix fuel with the air stream. For example, there are membrane-needle carburetors, and there are float ones. This is the type of carburetor of the VAZ family, produced by the Dimitrovograd Automobile Unit Plant (DAAZ).

Adjusting the VAZ 2107 carburetor is an important way to keep the engine in working order.

Before adjusting the carburetor, you need to know what type of carburetor is installed on the car. To do this, you need to remember that:

If you have a vacuum ignition corrector, this means that you have the latest type of engine VAZ 2103 or 2106 installed, and the modification of the carburetor 2107 is 1107010-20.
If a six-speed engine is installed on your "seven", but there is no installed vacuum corrector, then you have a modification of the carburetor 2107-1107010-10.

The main components of the carburetor to be adjusted:

In order to adjust the carburetor, you need to know the main symptoms of its malfunction. Since the carburetor is responsible for the acceleration dynamics of the car, these include the following:

difficulty starting the engine, long "sneezing";
all kinds of "jerks", "jerks", "dips" when pressing the gas pedal;
sluggish ability of the car to accelerate;
an unexplained increase in gas mileage.

So, if your car has corresponding "complaints", we proceed to its adjustment.

Video (click to play).

Attention! The most competent way is to make the adjustment on the removed carburetor. Adjusting the VAZ 2107 carburetor does not involve the use of fleecy and woolen fabrics, as well as various wires for cleaning the nozzles.

How to adjust the carburetor on your own on a VAZ 2107? When removing the carburetor cover, the float system is first adjusted, so convenient.

The float free play varies between the following values: 6.5 mm on one side and 14 on the other. This can be adjusted with a test template by placing the camera upright. In this case, the float touches slightly, but does not press on the valve ball.

In the event that the distance is less than 6.5 mm, then you need to slightly bend the tongue of the valve (needle), which is shown in the figure with the letter "A".

After that, we adjust the degree of opening of the needle valve, which passes gasoline into the float chamber. When the float rises, the flow of fuel decreases, when the gas pedal is pressed sharply and the throttle valve is opened, the fuel consumption increases and the float is lowered.

Now we adjust the deflection of the float to the other side. To do this, we remove it from the lid as much as possible and check it with a template, the thickness of which is 14 mm with a certain tolerance.

If the distance does not match, you need to bend the stop of the float mounting bracket and make it no more than 14 mm.

Now, after adjustment, the float free play is about 8 mm. Adjusting the VAZ 2107 carburetor also provides for checking the incoming grids and fuel filters to maintain a full fuel flow.

Setting up a VAZ 2107 carburetor with your own hands necessarily includes adjusting the starting device. Recall that it serves to confidently start a cold engine.For this, the mixture is twice, three times more saturated with fuel than with a normal hot engine power supply.

The starting device for carburetors of the 1107010 family operates at a frequency of 1500 rpm, that is, at the manufacturer's recommended cold start frequency.

If you look at the carburetor from the side, you can clearly see the channel through which the vacuum is supplied from the space behind the throttle behind the diaphragm of the damper opener:

If you remove the carburetor and look at it from the back side, you can see the vacuum supply channel:

If you disassemble the carburetor, then you can see the details of this diaphragm starting device:

Below you can see a schematic illustration of the carburetor trigger of the 1107010 family:

We explain the mechanism of action of the starting device. Pulling out the "suction", the driver, as it were, brings the starting device into the cocked state. Wherein:

The three-arm lever is "cocked" with a cable counterclockwise;
Carries away telescopic pull;
The thrust, in turn, rotates the choke through the lever.
The second arm of the lever presses on the axis of the throttle valve 1 of the chamber.
The air flow damper is now completely closed, the throttle damper of 1 chamber is slightly open for starting, creating a starting gap

When adjusting the starting device with your own hands, you first need to remove the carburetor. Then:

We turn the choke lever so that it closes. The device is now cocked.

Now you need to turn the carburetor over, measure the gap between the edge of the throttle valve (1 chamber) and its wall. For "seven" carburetors, this gap is 0.85-0.9 mm. The gap can be measured with a feeler gauge wire:

To bring it into this range, the drive rod on the throttle valve is bent.

After that we set the gap "A". It is located between the duct wall and the edge of the air damper at the bottom. To do this, close the flap again, “cock” the device. To create an imitation of air rarefaction, we recessed the trigger rod:

Now the rod has pulled the rod along the slot, and as a result, the damper opens. Gap "A" is 5-5.4 mm.

To adjust this gap, you need to turn the adjustment screw with a screwdriver, only first removing the screw plug from it:

How to set idle speed on a VAZ 2107

First you need to make sure that the ignition system is correctly configured, all wires are in good condition and the engine is fully warmed up.

We tighten the mixture "quality" screw to maximum speed (counterclockwise), while the mixture is enriched with fuel;
Rotating the “amount” counterclockwise, we set an even higher frequency on our own.
We carry out a "quality" check: is it possible to add more momentum.

The point of this operation is to wrap up the "quality" at a constant "quantity" up to 850-900 rpm.

You can evaluate the revolutions by an electronic tachometer, with skill - by ear, or by the tachometer of the dashboard.

The next step is regulation of the air damper drive.

If the position of the drive is ignored, the machine may stall. This requires a simple slotted screwdriver and a 7 mm open-end wrench.

The figure shows the position of the damper with recessed and extended "suction".

To adjust, do the following:

"Suction" is recessed;
We unscrew the thrust fixing screw with a slotted screwdriver (the spring pushes it vertically)
We tighten the screw;
Checking the damper stroke.

We adjust the throttle valve drive ("gas").

If this drive is incorrectly set, then the acceleration dynamics and throttle response of the engine deteriorate. This setup must be done with an assistant.

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The distance between the needle and the float with the needle valve open should be 15 mm.

This procedure can be carried out on a disassembled carburetor or directly on the engine.

In order to adjust the starting system, you need to remove the air filter, then you need to start the engine and pull the suction towards you.

Open the air damper forcibly by 1/3, then set the speed to 3200-3600 per minute.

After that, release the air damper and set the speed to 300 less than the initial one.

To adjust the idle speed, you need to warm up the engine to operating temperature, then using the quality screw, set the maximum speed, using the number screw, set the value to 100 rpm. above the norm. Start the motor with the quality screw, adjust the rpm.

At this, the adjustment of the VAZ 2107 carburetor can be considered complete, now I hope you will not have any problems with how to adjust the carburetor with your own hands.

In order to consolidate knowledge, I recommend to your attention the following video about how to adjust the carburetor with your own hands.

VAZ 2106 and 2107 are classics of the domestic auto industry. But what lover of dashing driving would not like to make his car more powerful and at the same time keep the amount of fuel consumed? Experienced mechanics know that for this it is only necessary to tidy up the car's carburetor and carry out timely repairs.For any VAZ car, from 2101 to 2107, only certain carburetor models are suitable.Carburetors DAAZ 2101, 2103, 2106. They were produced at the Dmitrov Avtoagregatny Plant, which bought a license from the Italian company Weber, therefore these carburetors can be indicated under both names.The devices did not differ in the complexity of the design, but they could please their owners with a fast acceleration of the car and good speed. One of the biggest problems in installing these models is that they are virtually unavailable on the market.In addition to speed and simplicity, Weber carburetors also provided incredibly fast fuel consumption - these "monsters" ate 10-14 liters per 100 km. fuel.More technologically advanced models, which were already installed in VAZ 2105 and 2107 cars, were also produced at the Dmitrov Avtoagregatny Plant. However, they were not only more advanced and improved, but also more environmentally friendly. It is for this that they received the name "Ozone". This carburetor made it possible to reduce fuel consumption to 7-10 liters. per 100 km, while maintaining the dynamic characteristics of their predecessors. The downside of the device was the complexity of its assembly and constant contamination in one of the chambers, which led to the fact that the acceleration of the car deteriorated noticeably, the speed decreased and the engine began to junk.A little later, DAAZ 21053 carburetors appeared. They were produced under the license of the French company Solex, hence the name of the models. These carburetors were not much like the previous DAAZ models. An updated design with a fuel return system made it possible to store 400-500 ml of fuel per 100 km. These carburettors were distinguished by good power with low gas mileage. The disadvantage of the device was the narrow fuel and air channels, which very often became clogged.Solex carburettors came in many variations with various auxiliary systems. In the CIS, the option with an electric idle valve has become the most popular.Often, inquisitive motorists resorted to independent carburetor replacements. One suitable model turned out to be the Solex 21073, famous for its wide jets and channels. Such a carburetor increased the power of the car, but at the same time raised the fuel consumption - 9-12 liters. for 100 km.The second non-standard carburetor, which with some modifications fits the VAZ 2106 and 2107 models, is Solex 21083. After expanding the diffusers and installing the nozzles, this device allows you to significantly increase the dynamics of the car without much fuel consumption. However, the process of upgrading the carburetor is very complicated and time consuming.In order to understand the state of the carburetor in the car, it is enough to carry out a small diagnosis.Signs of a defective carburetor:

the car began to consume more gasoline than it previously needed;

the engine starts to overheat quickly;

black smoke comes out of the muffler and pops, "sneezing" and "shooting" are heard. These malfunctions appear when the high-voltage wires are incorrectly connected, late ignition, improper operation of the distributor and the ignition system switch, after an unsuccessful repair of the timing belt, with an unsuitable fuel mixture;

the car began to noticeably lose power when driving;

the car accelerates much slower;

failures occur when, when you press the gas pedal, the car does not react instantly, but acceleration occurs gradually and with a delay;

there are jerks - frequent and short dips;

swinging occurs - several dips with a small interval.

It is important to remember that before starting to repair the carburetor, you should diagnose the entire engine power system and its technical condition.Typical carburetor malfunctions:

There is no fuel in the float chamber or the fuel mixture is too rich / lean. In this case, the car engine does not start at all or starts, but immediately stalls.

Clogged idle channels or nozzles.

The solenoid valve is intermittent.

Malfunctions have appeared in the control unit or among the elements of the forced idle economizer (EPHH).

It starts to malfunction or the rubber O-ring has melted.

Fuel "overflows", the level in the float chamber does not hold. The reason is the depressurization of the fuel valve.

If suddenly your carburetor becomes unusable, do not throw it away. Repair of this important "organ" of the car is the fastest possible replacement of faulty parts. In order to determine which parts need to be replaced, you should disassemble, clean the carburetor and carefully inspect the constituent mechanisms.The carburetor is removed if a malfunction is found in it, but there is no way to do this by partial disassembly. The carburetor is also removed for replacement, adjustment and cleaning.It is filmed as follows:

To begin with, all kinds of attachments and cables for the damper drive are removed.

The air filter housing is removed from the studs. To do this, unscrew all the nuts on which it is attached to the carburetor. The clamping nut is pushed back and the air damper cable sheath is pulled out of the mounting bracket.

The outer surface of the parts is cleaned from contamination.

The air damper drive cable is loosened and the fuel supply and crankcase gas discharge hoses are removed.

The hose between the economizer and the pneumatic valve and the hose of the vacuum ignition distributor are disconnected.

Then the nuts are unscrewed, with which the carburetor is attached to the intake manifold.

The carburetor body is removed and the intake manifold opening is plugged with a clean rag to avoid clogging.

Remember to check the integrity of the gasket that is between the carburetor and the intake manifold. Replace it if necessary.Before you start cleaning the carburetor, you need to carefully prepare: buy a special aerosol cleaner from a car dealer, arm yourself with smooth dry rags, a tire inflation pump, remove the carburetor and disassemble it.Nozzles - fuel and gas supply channels - are cleaned with compressed air or a liquid pressure cleaner. Mechanical cleaning with any fluffy or metallic objects is prohibited.When cleaning the nozzles with compressed air (you can use a tire pump for this), the idle nozzle body, the main dosing system (air and fuel), then the valves and channels of the pump sprayer are blown through.In case of severe contamination, the jets are placed in acetone so that the deposits soften or completely dissolve. Then they should be purged.Owners of domestic vehicles, such as, for example, the VAZ-2103, quite often try to fix the car with their own hands. Despite the fact that modern service stations are located almost at every corner and, turning to qualified specialists, one could avoid wasting their own time, many are in no hurry to solve their problems in this way. Some self-taught masters independently carry out such complex operations, which include adjusting the VAZ-2103 carburetor. Of course, in order to do this with your own hands, you need not only free time and patience, but also important and useful knowledge regarding the features of the device in question. Image - DIY carburetor repair VAZ 2103

Adjusting the VAZ-2103 carburetor requires free time, patience and knowledge

In the material below, we will consider the principle of the device of the domestic VAZ-2103 carburetor, its tuning and adjustment.

Many motorists who do not even know how to adjust the carburetor on a VAZ-2103 simply do not understand the principle of operation and the device of this device. The function of any carburetor is to mix gasoline with air together. Thanks to such a simple device, a special mixture appears in the car at the moment of activation of the power unit, which is transported to the engine cylinders.In fact, the efficiency of the vehicle itself depends on how well the engine is supplied with gasoline.

Among other units of the device in question, it is worth noting elements such as air and throttle valves, mixing chambers and an idle valve. Of course, these are far from all the components of the VAZ-2103 carburetor; in the material below, we will consider in detail the action and principle of setting up each individual unit.

The function of the VAZ-2103 carburetor is to mix together gasoline with air

The functionality of any power unit that interacts with a carburetor depends on several important criteria:

starting and warming up the engine;
idle devices;
a structure responsible for controlling the amount of fuel;
an accelerating pump (it depends on how quickly the car can accelerate);
the operability of the elements located in the central dosing chamber;
econostat (located in one of the internal combustion chambers of the engine).

If the owner of a domestic vehicle is sure that the repair of the VAZ-2103 carburetor is urgently needed, do not rush to premature conclusions. Quite often, a simple but competent adjustment is enough for the machine to start functioning as before. Setting up such a unit, by the way, requires the knowledge of the master concerning all calibration data (set values). In order for the carburetor setting to be successful, it is important to establish all the components of the system. Typically, these activities should start with external control components. Make sure that the throttle valves are working properly: if the gas pedal is not under pressure, they should be closed. As soon as the gas pedal is pressed, the flaps should open as smoothly as possible (not jerking).

The next step, which provides for the correct setting of the VAZ-2103 carburetor, should be checking the air damper. If the actuator is recessed, the component under test must be vertical to avoid blocking the passage to the throttle valve.

Carburetor tuning starts with checking the external control components

The accelerator pump should also deserve no less attention. Its functionality helps to determine the sharp impact on the pedal. The condition of the pneumatic diaphragm should also be determined. Only after the motorist is confident in the normal operation of the elements (after an external check), it will be necessary to spend some time cleaning the nozzles and nozzles. First of all, you should get rid of the cover of the tuned device, then, using a pump, achieve the release of the float chamber from various sediments. If there is a very solidified residue, you can resort to a spatula made of metal or wood.

Proper tuning and cleaning of the carburetor should provide for the absence of any rags that could clog the jet. As a result, the nozzles and channels will have to be flushed with clean fuel and blown out with air. In order to make sure that all components are completely clean, you need to dismantle them before flushing all the channels. It is important to keep track of the order in which the jets will be removed, since subsequent incorrect installation will lead to failure of the power unit. All holes can be wired free of harmful build-up.

It is necessary to completely clean all components: dismantle them and flush all channels

Adjusting the VAZ-2103 carburetor provides for the need to check the mesh filter. This element is responsible for the purity of the fuel that goes directly into the float chamber. To clean it, you will have to remove the plug and filter, then free the mesh from any unpleasant adhering particles and blow out the filter itself so that the air flows in the direction opposite to the fuel movement.In this case, any mechanical impact should be avoided.

Before returning the element to be cleaned, you will have to make sure that the fuel jet is functioning well. If necessary, it can be purged. As a rule, the float chamber should be free of gasoline and its needle valve should be opened. Before the strainer returns to its rightful location, you need to check the sealing gasket, which can prevent fuel from leaking.

Adjusting the VAZ-2103 carburetor is not complete without cleaning the mesh filter

If you need to adjust the VAZ-2103 carburetor, you will have to pay some attention to the float chamber. If the owner of the vehicle has noticed an increased consumption of gasoline, most likely, the reason will be hidden in the too high level of fuel, which is in the checked system. If a completely opposite malfunction is noticed (lack of gasoline), you should start checking the level of gasoline in the float chamber and the functioning of its needle valve.

First of all, you should get rid of the carburetor cover and after it is in a horizontal position, adjust the gap that will be formed between the floats and the place where the removed device will be attached to its base (the distance should not exceed 6.5 mm ). This is exactly the gap that should be at the maximum possible level of gasoline in the float chamber. To set up the system, you need to use the float tab. After that, it is important to check the functionality of the needle valve by removing the pivots of the floats and dismantling the valve itself. Both the one and the other element should not have mechanical damage.

Float chamber of the carburetor VAZ-2103

After the adjusting element of the system is installed in place, it is necessary to achieve the flow of gasoline through the filter using a pear. The motorist's job is to pass freely through the needle valve. The floats must be in place, then it is important to re-pump the gasoline to make sure that there are no smudges anywhere. The result of the work should be the installation of the cover and the check of the gasket (located in the middle between the structure and its cover). The latter should be located in such a way that it cannot interfere with the overlap of the channel and at the same time be in the fastening holes. The lid should be tightened so that there is no overtightening (there should be no deformation). Otherwise, the deformed part of the system will lead to air leakage or gasoline leakage.

It is worth noting that adjusting the VAZ-2103 carburetor is advisable only after warming up the engine and acting on the suction button.

Adjustment of the VAZ-2103 carburetor will not be complete if the motorist forgets to adjust the starting device system. It is worth noting that a similar procedure can be performed both on a previously removed unit, and directly while it is in the car. In the event that the car owner decided to adjust the starting device without removing the carburetor, you will first have to take care of dismantling the air filter, activating the power unit and slightly raising the suction. As a rule, engine rpm should not drop below 3200 rpm.

As soon as the above recommendations are fulfilled, it will be necessary to forcibly raise the air damper (at least by a third). Thanks to this manipulation, the number of revolutions should be reduced by 300 units.

The gap of the VAZ-2103 carburetor should be about 5.5 mm

There are times when such actions are not enough. The motorist will have to adjust the speed by means of the traction from the pneumatic drive by adjusting the length of the traction.Adjusting the same structural element on a removed carburetor requires adjusting the distance between opposite sides of the choke.

If you think about how to adjust the carburetor on a VAZ-2103, you should not forget about the need to take into account the gap (it should be about 5.5 mm). In view of this circumstance, it is necessary to remove the tube of the starting unit and turn the adjusting element of the structure using a thin screwdriver. If you start to tighten this screw, the gap will gradually become smaller, in the opposite case - larger. If the motorist independently adjusts the carburetor of the domestic VAZ-2103, he must control the gap that remains between the throttle valve and the diffuser. This gap should not exceed 0.8 mm.

Often, people who are interested in adjusting the VAZ-2103 carburetor mean by performing the process exclusively setting the idle speed. Before proceeding with such a procedure, it is necessary to activate and warm up the power unit a little (it should reach a temperature of 90 ° C). As a rule, adjusting the idle speed of the device in question is impossible without the participation of two screws (the amount, as well as the composition of the combustible mixture). One of the screws must be closed with a plug, after which it is necessary to activate the motor. With the screw responsible for the amount of the mixture, the engine speed should be increased to 1000 units. And with the screw, reduce the mixture composition adjustable by 200 units. In the case of proper tuning, the motor will function stably, vibrations should not appear, and the number of revolutions should not vary up and down.

Competent adjustment of the VAZ-2103 carburetor is possible only if the motorist has certain skills and knowledge in the field of the device of the tunable unit.

Learning to adjust the carburetor VAZ 2103, 2105, 2106, 2107 on our own

How the carburetor VAZ 2107 works

Carburetor assemblies

Carburetor systems

How to set up a carburetor

Checking the condition of the mesh filter

Setting up the float chamber

Adjusting the starting device system

We adjust the idle speed of the VAZ carburetor

Owners of VAZ 2103, 2105, 2106, 2107 cars probably faced the need to adjust the carburetor. The first desire you have is to visit the service station and solve all your problems. But there is no need to rush to the masters, because the adjustment of the VAZ 2107 carburetor can be done by hand. You will need time, patience and some knowledge of the features of the device and operation of this unit.

The carburetor is designed to mix fuel with air. This creates a combustible mixture that is transported to the cylinders of the internal combustion engine. On VAZ 2107 cars there are float-type carburetors "Ozone", "DAAZ" 110701010. The device of carburetors "Ozone" and "DAAZ" 21071107010 is identical (read about it below).

For self-adjustment of the carburetor, it is useful to know what assemblies and systems it consists of. To provide the engine with high-quality fuel, the carburetor systems must work “like a clock”.

The carburetor nodes VAZ 2107 are:

• Compartment for removal of crankcase gases.

• Air and fuel jets.

For high-quality operation of a car engine, you will need flawless operation of the carburetor systems:

1. Engine start and warm-up system.

2. Idling system.

3. Constant fuel level control system.

4. Accelerating pump (to guarantee the acceleration of the machine).

5. Large diffuser in the carburetor body, VTS atomizer, air and fuel jets, emulsion tube and emulsion well. Their location is the main dosing chamber.

6. Econostat system. This is an enrichment device in the second combustion chamber of the engine.

To adjust the carburetor, calibration data are needed, which describe all the necessary values for adjusting the VAZ 2107 carburetor.Having started tuning the carburetor, it is necessary to check the operation of all units and systems that control the operation of the carburetor. To do this, you must start checking with external controls. Check the throttle actuator for full throttle lever travel. In the released mode of the gas pedal, the throttle valves in both mixing chambers must be completely closed. The gas pedal is depressed to make sure that the throttle valves operate smoothly and without jerking, consistently (first in the primary and then in the secondary chamber, they fully open and become vertical, opening the throat completely).

Then you need to check the operation of the air damper. With a fully recessed air damper drive on the panel, the air damper should be strictly vertical, without blocking the passage to the throttle valve. If the drive cable is pulled out, the throttle valve should close the primary mixing chamber smoothly and without jerking. After that, make sure that the return springs of the air and throttle valves, the levers of the drive of the throttle valves, the rods of the connections of the drives of the air and throttle valves are intact and that they are securely fixed.

You can check the operation of the carburetor accelerator pump by rapidly depressing the pedal. The operation of the pneumatic diaphragm should also be checked. After completing the external inspection of the carburetor, you need to clean the main jets, carburetor nozzles. You will need to remove the cover from the carburetor and, using an air pump or a rubber bulb, clean the float chamber from sediment on the bottom and possible condensation (the bottom of the float chamber, in the presence of solid sediment, can be cleaned with a spatula - wooden or non-ferrous metal).

After that, we wash all the jets and channels of the carburetor with clean fuel from a separate container. At the end of the work, blow through all the jets and channels with air. If you doubt the purity of the channels, then the jets must be unscrewed before the flushing procedure (remember exactly which jets where they were: each jet has its own calibrated hole). If the jet is misplaced, the engine will not be able to operate normally. The holes in the nozzles should be cleaned with soft copper or aluminum wire without burrs.

The mesh filter installed in the carburetor is the last line of cleaning the fuel from dirt, moving into the float chamber. To clean it, you need to unscrew the plug and remove the mesh filter itself. Now the filter mesh from the outside needs to be cleaned of adhering liquid. After that, you should carefully blow it from the inside in the opposite direction of the fuel flow, avoiding mechanical damage.

Check the condition of the carburetor fuel jet before reinstalling the strainer. Purge it if necessary. Remember: there should be no fuel in the float chamber, the needle valve of the float chamber must be open (if the fuel is not removed from the float chamber, the float adjustment may be violated and, as a result, the carburetor will "overflow"). After all work has been done, carefully refit the strainer.

The float chamber is responsible for fuel consumption. The reason for the high fuel consumption of the VAZ 2107 carburetor may be a high fuel level in the float chamber, an enlarged orifice of the nozzle, an unscrewed nozzle (in this case, the fuel does not enter through a calibrated hole, but along the thread and through the hole, resulting in "overflow"). If problems are detected with a lack of fuel (the engine does not develop the required power) or with "overflow" (wet candles, pops in the carburetor), you need to adjust the fuel level in the carburetor float chamber, check the condition of the VAZ 2107 needle valve.

First, remove the carburetor cover.In the inverted state (when the lid is strictly horizontal), the distance between the floats and the surface of the connection between the lid and the body should be about 6.5 mm. This is the position of the maximum fuel level in the float chamber (with the needle valve closed). Adjustment must be carried out with the float tongue. After setting the level, it is required to check the operation of the needle valve. To do this, carefully remove the axis of the floats and unscrew the needle valve. Inspect the valve seat and the needle itself: they should be free of scoring and mechanical damage.

Reinstall the parts and pump fuel through the strainer (it should pass freely through the needle valve) through the supply connection with a bulb. Install the floats in place and once again pump the fuel with a rubber bulb (fuel must not seep through the valve). After all work, the carburetor cover is installed in place. When installing, make sure that the gasket, which is installed between the body and the cover, "sits" in its place: does not block the channel and lies exactly in the mounting holes, bypassing the jets. Tighten the cover evenly without overtightening to avoid deformation. A deformed cover can lead to air leaks or fuel leaks.

Adjustment of the starting device system can be done on the dismantled carburetor or on the machine itself (without dismantling the carburetor). If we adjust the starting device system without removing the carburetor, then before adjusting the starting device it is necessary to remove the air filter, start the engine and pull the suction towards you. The engine speed should be in the region of 3200-3600 per minute.

Then forcibly open the choke 1/3 of its travel. In this case, the revolutions should be established by 300 units less than the initial ones. If the goal is not reached, then using the pneumatic drive, change the number of revolutions by adjusting the length of the rod or "bending" it.

If the starting device system is being adjusted on a dismantled carburetor, then the amount of closing the air damper must be adjusted. Remember: the gap must be 5.5 mm from the air damper to the mixing chamber housing. To do this, remove the trigger tube and use a thin screwdriver to turn the adjusting screw. When the screw is tightened, the gap decreases, and when it is unscrewed, it increases. When making adjustments, control the gap between the throttle valve and the diffuser in the area of the transition holes (it should be 0.7-0.8 mm).

Frequently asked question: how to adjust idle speed? Before starting work on adjusting the idle speed, the engine must be warmed up and brought to operating temperature (85-90 degrees). The idle speed of the VAZ carburetor is adjusted with two screws for the amount and composition of the mixture. The second screw is closed with a plug. Start the engine. Using the mixture amount screw, raise the engine speed to 1000-1100 units. After that, with the screw of the mixture composition, reduce the speed by 150-200 units. In this mode, the engine should work stably, without vibration, the speed should not "float". Repeat the procedure several times if necessary.

Video (click to play).