Carburetor VAZ 2107 from A to Z: adjustment

Classic VAZ models should be understood as cars from 2101 to 2107. Owners of such cars with a carburetor often resort to searching for more effective solutions to improve dynamic performance and/or reduce fuel consumption. Both acceleration and efficiency directly depend on the model of carburetor under the hood and on the quality of its adjustment. If the owner decides to install a third-party carburetor, then a number of individual features need to be taken into account when choosing.

Main types of carburetors

The Seven engines are equipped with both a carburetor and an injector. The operation of the injector does not depend on weather conditions. But the carburetor is much simpler in its mechanical structure, which makes its repair and tuning more accessible.

Not all carburetors are designed to do the same thing. For example, there are models on the market that reduce fuel consumption or, on the contrary, increase fuel consumption, which in turn allows you to maximize the dynamics of vehicle acceleration. Such different models of carburetors were produced for different engine sizes, so it will not be possible to rearrange them so easily. If you suddenly decide on such an experiment, then you cannot do without alterations. And all this is true when it comes to standard models. But what if the car owner decides to install a non-standard carburetor?

However, first, let's turn our attention to the standard classic models.

Choosing a carburetor for a VAZ classic

Description of models

The first VAZ 2107 was standardly equipped with a DAAZ carburetor In Russia, they were modified to meet the needs of the local automobile industry. DAAZ products had simple assembly, which subsequently affected their price. The given carburetor model was characterized by maximum simplicity and made it possible to provide good acceleration characteristics to the car. Initially, the space in the engine compartment was created specifically for DAAZ.

The VAZ 2107 carburetor is a complex, high-precision device, consisting of two chambers, one of which - the first is equipped with a special mechanical damper drive. It can be installed on any domestic rear-wheel drive car. The volume of the model in question is 1.5 and 1.6 liters.

Gasoline consumption when using DAAZ increases noticeably. But this is consistent with the car’s speed indicators, which are also increasing. And this is especially important when overtaking.

Drawing our attention to the model - “Ozone” - it is worth noting that this is a more modified version of the standard DAAZ. The new optimized mechanism had better environmental performance. Thanks to this, “Ozone” received its environmentally friendly name. In addition, it consumed much less fuel than the previous version, so for such an economical car as the VAZ 2107, the Ozone carburetor was considered the most optimal option of all possible.

Good maneuverability and speed of the car were given by a pneumatic valve located in the new carburetor and ensuring the efficiency of the second chamber. However, there was one “but” - even if the valve was slightly dirty, the second chamber stopped working. The speed of the vehicle immediately decreased. This was noticeable in the acceleration dynamics of the car and when the engine was running at medium speeds.

The Solex 21053 carburetor is no less popular among VAZ 2107 owners. At the moment, it is the latest development. Solex has a rather complex assembly, but at the same time it has a fuel reverse supply system, which makes this carburetor the most economical among the entire DAAZ line.

The carburetor mechanism has a larger volume compared to other models: 1.8 Solex versus 1.5, 1.6 other DAAZs. All these features tell us that this carburetor model is simultaneously designed for economical and fast driving.

Initially, Solex was created for cars with front-wheel drive. And yet, this carburetor can be installed on a VAZ 2107 without special modifications. Solex is picky only about the quality of fuel.

Important! The system may malfunction! In most cases, this is due to the fact that the air and fuel channels are clogged with dust. The solution to this issue will be timely maintenance of the carburetor.

All of the carburetors we list are installed on classic engines. If the size of your engine is not designed for the existing carburetor, then you will need to select and replace the jets. It is also worth adjusting the carburetor.

On the issue of non-standard carburetors, it is worth saying that in some cases, owners of “classics” resort to just such a solution. Without alterations and adjustments there is no question here.

“Solex” 21073 is a model designed for engines with a volume of 1.7 liters. The carburetor differs from previous versions by large channels and jets. Dynamic growth is guaranteed! But so does the subsequent expense.

The following non-standard model is installed on cars of the VAZ 2108 and 2109 series. “Solex” 21083 for installation on version 2107 will require certain modifications. Also, installing it will lead to the fact that at about 4000 rpm the engine will not be able to spin up any further. To install this carburetor model, you need to drill out the chamber diffusers. Then expand them. During the modification process, large jets are also installed. The result of such work can please you: fuel consumption will be lower, and the dynamics will exceed those of other models.

What carburetors are installed on the VAZ 2101-2107?

The very first cars were equipped with DAAZ 2103, 2101, 2106 carburetors, which were produced under license at the Dmitrievsky Automobile Plant. The license was obtained from the French company Weber, so some were called Webers, and others DAAZ, both names are correct. To this day, they remain the most preferred, since their design is simple, while they provide excellent dynamics for the car, but their fuel consumption varies from 10 to 13, 14 liters, which repels potential buyers. Now they are not easy to find in good condition, new ones have not been produced for more than twenty-five years, and old ones are sold at flea markets in simply terrible condition, so to collect one you need to buy two or three more. Today, completely new DAAZs, 2105-2107, have replaced the old ones. They have an improved system compared to their predecessors. They have another name - Ozones. Why Ozone? It's simple - these are perhaps the most environmentally friendly devices that are installed on classics. They have a good system, but sometimes small problems arise with the second chamber, which opens not mechanically, but using a pneumatic valve, popularly called a “pear”. And when the VAZ 2107 carburetor becomes very dirty, its opening does not occur at all or occurs late, which is why the maximum speed decreases, the power drops and the car begins to twitch at high speeds. These devices are quite economical, since the consumption is about 7 - 10 liters, and at the same time provide excellent dynamic qualities. The cost of such a carburetor for the VAZ 2107 is quite reasonable.

Design and principle of operation

Despite the fact that the carburetor performs a well-known function in a car, the structure and principles of its operation require detailed consideration. After all, the amount of fuel consumed by the machine, as well as its dynamic performance, depends on this mechanism. “Solex” are two-chamber carburetors with a balanced float chamber, with sequential forced opening of the throttle valves and heating of the coolant of the idle channels.

Carburetor design

The structure of the mechanism includes:

float chamber. It is needed in order to maintain a given fuel level. The supporting device consists of floats and a valve;
the idle and transition system works when the main dosing system can no longer work (cannot work due to low vacuum, since the throttle valves are either closed or slightly open);
the accelerator pump injects fuel in order to smoothly transition to the increased load mode;
starting system. For stable engine starting, an over-enriched mixture is needed. It occurs when the air damper closes and the throttle opens slightly. To prevent the engine from stalling from the resulting mixture, the air damper is opened slightly again due to the force of the diaphragm in the main dosing system;
The econostat only works at high speeds, when fuel passes through the nozzle and delivers it to the nozzle hole, which is located in the low-pressure area;
The power mode economizer saturates the mixture at full load to achieve maximum power.

The two main parts that make up the Solex are the cover and the body. The cover is secured to the body with five screws. There is a gasket between the screws and the housing. The cover itself contains: fittings and studs for fastening the air filter, an EPHH solenoid valve, channels through which air is delivered to the main air jets, a needle valve, an air damper and an econostat sprayer.

The Solex carburetor body contains: emulsion wells, an accelerator pump, throttle valves, their drive mechanism, a starting device, an econostat, a float chamber, an economizer and an accelerator pump.

The design and operating principle of this carburetor are not fundamentally different from devices of a similar type.

Checking the pump accelerator and repairing it

You need to start checking by testing the functionality of the system. You need to collect in a beaker the fuel that will be generated during 10 cycles of operation of the throttle lever. From 5.2 to 8.7 cm³ of fuel should accumulate. If this is not the case, you need to clean the VAZ 2101 carburetor jets. To do this, bleed the pump. This will help clear clogged injectors. This procedure is performed about 10 times. Then the fuel is measured again.

If the purging procedure does not give the desired result, the accelerator will need to be completely replaced.

If the engine malfunctions at high speeds, you need to check the pump diaphragm. It could wear out. The fuel pump rod often wears out.

Basic faults

Solex carburetors are the same technology as other mechanisms in a car, so even with proper operation, it can wear out and eventually fail. Some of the faults can be determined by the way the machine operates. But there may be something hidden from your eyes inside the carburetor body. In this case, diagnosing the breakdown will be much more difficult.

The owner of a VAZ 2107 can judge the incorrect operation of the Solex by the following signs:

jerks and jolts when the vehicle moves;
increased fuel consumption;
problems starting the ignition;
engine failures;
decreased acceleration dynamics;
idle failures.

Faulty operation of the VAZ 2107 carburetor when it wears out has a bad effect on engine power. Some things can still be cleaned, but somewhere else a full replacement of parts will be required. Any problems associated with misalignment of parts or associated with changes in the operation of the power unit are a clear knock on the door of the repair room.

Let's look at the most common problems that arise when a Solex carburetor wears out:

Gasoline is not supplied

The reasons that fuel does not enter the carburetor may be: lack of pressure in the fuel supply system, faulty fuel pump, dirt in the supply hose from the gas tank, or an outdated gas filter. In this case, it is recommended to try to blow out the fuel line or change the fuel filter.

Pouring gasoline

If you find leaks of gasoline (especially in winter they are very easy to notice - small puddles of gasoline in the snow), then be careful! This may cause a fire . Therefore, this problem must be resolved immediately! Most likely the solution lies in the depressurization of the hoses. The operation of the accelerator pump also needs to be checked, since if the problem is related specifically to it, then the cause of gasoline leaks may be excess fuel that is formed during accelerated operation of the pump.

Shoots

“Shooting” in the carburetor can be caused by a severe leanness of the fuel mixture, incorrect connection of high-voltage wires, a timing belt that is displaced by two or three teeth (when you change it completely, the belt must be tensioned well, and over time, tightened when displaced) and incorrectly installed ignition moment. The malfunction is detected when you press the gas pedal. As a result, you see the car jerking jerkily, after which it begins to stall.

The second camera does not work

Often the second chamber on Solex carburetors reminds of itself by breaking down. To eliminate it, we need to establish the cause of its occurrence. There can be as many reasons as with “shooting”. Here are all kinds of malfunctions: flooding of the carburetor chamber, incorrectly set gap, problems with opening the damper, lack of the proper amount of fuel, some components of the chamber have failed. You can determine the cause of the malfunction by unscrewing a couple of spark plugs. If the carbon deposits on the spark plugs are abnormal (black), this may indicate either a mixture that is too rich or too lean. Ideally, it is necessary to check the operation of all elements of the system.

Accelerator pump does not work

This problem can occur if the accelerator pump does not operate correctly. Because of this, the volume of fuel may be too large or too small, since the required pressure in the system is not provided. To solve this problem, you will need to remove the carburetor, disassemble the pump device and diagnose its operation. Most often, the malfunction may be due to wear of the rubber parts of the pump.

The engine stalls when you press the gas

One of the most common problems that VAZ 2107 owners face is the engine’s refusal to start. This can happen even after the car has been started. All this tells us that the fault lies in the float chamber. There may simply be no fuel in it or its level may be extremely low. Most often, engine starting problems occur due to the mixture being rich or lean. To deal with this problem, you will need to disassemble the carburetor and check the functionality of individual elements. (float, jets, dispenser)

If the car is only idling and the same problem occurs, then the malfunction may be hidden in such components as: control unit, solenoid valve mechanism, idle jets.

Regardless of what the problem is, you will need to inspect all parts of the idle system, adjust their quality and quantity with screws, tighten them, blow them and wash them.

Summarize

Finally, we add that there are single-chamber and two-chamber models of foreign-made carburetors. The disadvantages of this choice include high cost, difficulty in setting up and maintaining, as well as not always better dynamics and efficiency compared to the DAAZ, Solex or Weber carburetor models listed above.

Features of adjusting the Solex carburetor. How to set the fuel level in the float chamber, adjust the idle speed, select jets, remove dips.

Carburetor cleaning: when to clean the metering device, signs and symptoms. Available methods for cleaning the carburetor without disassembling and removing it from the car.

Why does the engine shoot into the carburetor and into the exhaust system. Causes of popping sounds in the carburetor, additional symptoms, troubleshooting.

Carburetor adjustment and tuning

You will need to adjust the VAZ 2107 carburetor and configure its systems just when you begin to notice such defects in the operation of the mechanism. What to do if your car can barely start, even when the frost has not yet arrived and the temperature outside does not drop below zero, and the tachometer needle does not float, but jumps? Or when you press the gas, the engine stalls and stalls.

There are problems such as, for example, the problem of the ignition system, where when a spark is formed, the mixture in the cylinders ignites. In older “classic” models, the ignition coil breaker is responsible for this. In more modern cars, a contactless ignition system is installed, where the ignition switch (distributor) is responsible for the appearance of the spark. But even this seemingly complex problem can be resolved manually. Many carburetor problems can also be adjusted manually. Let's try to figure out some of them...

Adjusting the float system

Any carburetor adjustment begins with adjusting the float chamber. Fuel consumption and engine stability will depend on this part of the mechanism. It is important to follow technology! We start the engine for 3-4 minutes. Then turn off the power. We remove the air filter housing, as it interferes with access to the carburetor unit. Remove the supply pipe from the surface of the carburetor. Then remove the lid from it. We measure from the edge of the float chamber to the level of the remaining fuel. The distance between them should not be more than 25.5 mm. If you find that this is not the case, then it will be necessary to adjust the position of the float. Depending on whether you decrease the distance or, on the contrary, increase it, the bracket on which the float is held will need to be bent to one side. The float axis must be positioned so that it moves freely.

Idle speed adjustment

Adjusting the idle speed of the car is carried out without disassembling the carburetor. However, before making adjustments, you will need to warm up the engine to 90 degrees. Remove the air filter housing. Take a screwdriver and tighten the quality screw until it stops. Then unscrew the screw 4 turns. We start the engine and turn on everything at once to increase energy use. We use the quantity screw to set the optimal speed for the VAZ 2107 - this number does not exceed 800 revolutions. Next, use the quality screw to achieve the maximum value - 900 revolutions. Then we unscrew it in the reverse position until the motor jerks. At this moment we stop twisting and make 1 revolution back. At the end of the work done, turn off the engine.

Adjusting the starting system

We carry out the adjustment on a not warmed up engine. The carburetor is not removed from the engine. First we connect the tachometer. Then pull out the carburetor choke control handle all the way. Let's start the engine. Using a screwdriver, open the edge of the air damper by one third. Rotate the throttle position adjusting screw under the choke control lever with an open-end wrench to 7mm and set the crankshaft speed to 3200-3400 rpm. Release the air damper. We rotate the trigger screw with a slotted screwdriver, loosening its lock nut with an 8 mm wrench. Thus, we reduce the rotation speed to 2800-3000 rpm. Finally, tighten the locknut again.

Setting the “choke” (air damper drive)

To begin setting up the air damper drive, remove the air filter from the carburetor. Open the air damper. On the damper control lever, loosen the locking screw of the drive rod end. Loosen the screw with one key, and use another 8 mm key to hold the screw bushing. We also loosen the tension of the rod sheath clamp screw. The choke handle must be recessed all the way. After making sure of this, turn the air damper control lever all the way by hand. The distance we set between the edge of the rod shell and the angle of the lever should be 10 mm. Turn the air damper control lever back clockwise. Finally, tighten the shell locking screw and the rod locking screw. Don't forget to make sure that the damper opens and closes completely.

If you are clearly confident that you will undertake the repair of your carburetor yourself, then additional information about the problems associated with it will definitely be useful to you. Well-known carburetor expert Nail Poroshin can share advice on this topic on the Internet.

Carburetor filter

The carburetor strainer is responsible for the normal flow of gasoline from the fuel line into the float chamber. Therefore, in order to avoid the problems that its contamination can bring (and this means improper operation of the entire fuel system!), it is recommended to carry out periodic cleaning.

Cleaning the strainer

Using a 13 key, unscrew the filter plug and remove it along with the mesh filter. Then we clean the cells of the mesh filter (a toothbrush will do) and blow them with compressed air. In the same way, we clean the removed filter plug and its seat in the carburetor cover. And be sure to blow everything out with compressed air.

Throttle valve adjustment

Adjusting the VAZ-2101 carburetor begins with adjusting the throttle valve. This is a simple procedure. It can be done in three stages. Manually turn the damper control lever counterclockwise. It opens completely.

The distance to the primary chamber is measured. The carburetor design suggests that this figure is 12.5-13.5 mm. If the result is different, you need to bend the rod antennae. Throttle adjustment involves determining the opening value of the throttle valve. It should be 14.5-15.5 mm. Otherwise, you will need to tighten the pneumatic drive rod.

Carburetor cleaning

Carburetor cleaning is carried out during a routine inspection of the car, which is done once a year.

Important! Before you begin cleaning, you must dismantle the device. Care must be taken to ensure that foreign particles and bodies do not enter the intake manifold. The cleanliness of the workplace must be ensured!

First, clean the outer surface of the mechanism. Carefully remove adhered dirt.
We disassemble the float chamber and wash it with clean gasoline. When doing this, we try not to disturb the setting of the float, otherwise they will have to be adjusted again.
We disassemble the vacuum accelerator and remove the strainer.
It's time to remove all the jets. Since they are made of soft metal, it is recommended to clean them using a stiff fishing line or soft wood chips.
Provided that the carburetor is completely disassembled, you can completely purge all fuel and air passages. In this case, you will need a compressor with a thin nozzle.

It is not necessary to clean the unit with gasoline; there are also special products for washing carburetors for this purpose. If it is not possible to use a compressor, then we replace it with a conventional pump. Once you have completely cleaned the carburetor, you can begin assembling it and reinstalling it. It is worth drawing your attention to the fact that all metal components must be disassembled and washed separately. Special liquids for washing carburetors can damage them. Do not neglect all actions! First of all, they are aimed at maintaining the functionality of the system.

How to adjust the carburetor on a VAZ 2101

First you need to prepare the appropriate repair kit for the VAZ 2101 carburetor. You will also need new cuffs, carburetor jets and other spare parts. To adjust the carburetor, you will need a repair kit, which includes the following tools:

After appropriate preparation of the repair kit, you can begin adjusting the VAZ-2101 carburetor. This does not require much effort. All actions must be careful and precise.

You also need to inspect the components on which the operation of the motor may depend. You need to inspect the spark plugs. By their appearance you can tell in what proportions the fuel is mixed with air.

The carburetor needs to be cleaned. To do this, dismantle its top cover. The float and vacuum valve are removed. The interior of the chambers needs to be cleaned. Soot and dirt accumulate here. Cleaning is carried out using an air can or a pump.

Another mandatory action is to check the gap between the distributor electrodes, as well as the high-voltage coil and wires. The adjustment is carried out only after the engine has warmed up to 90ºС. Cars are put on handbrake.

Removing the carburetor

However, before you start cleaning the carburetor, you need to disassemble it, following a sequential procedure.

Using an “11” wrench, unscrew the bolt securing the liquid chamber housing to remove the semi-automatic starting device. Remove it together with the sealing rubber ring. Using a screwdriver with a sharp tip, pry off the retaining ring of the air damper drive lever. Then we pry up and remove the locking wheel of the throttle valve of the first chamber. We press on the levers and rods, disengaging them from each other. Unscrew the three screws securing the starter housing with a Phillips screwdriver. Remove the starting device assembly. It is not recommended to disassemble this device.

You can disassemble the carburetor without removing the starter. To do this, you will need to disconnect the lower lever of the starting device, and then use a Phillips screwdriver to unscrew the five screws securing the cover.

Use a hammer to knock out the axle with a float using a drift. Remove the cover gasket. We turn out the needle valve body with a spanner “11”. We take it out and the copper o-ring. We unscrew the inlet fitting with a “15” wrench and remove it together with the sealing ring. Using a 13 key, unscrew the solenoid valve and remove the idle jet. Unscrew the screw securing the throttle body heating unit. We turn out the main air and fuel jets. Remove the accelerator pump nozzles. Fuel jets can simply be shaken out of the wells.

Using a Phillips screwdriver, unscrew the three screws securing the economizer cover. After removing the cover, take out the spring and diaphragm. Using a screwdriver, unscrew the economizer nozzle and remove it. Unscrew and remove the four screws securing the accelerator pump cover. Next, remove the diaphragm along with the return spring. Now you can unscrew the screw of the plastic wire holder of the EPHH screw sensor and remove the wire. Unscrew the throttle valve stop screw. Then unscrew the screw securing the sector and the damper control lever. We remove the unscrewed lever and, applying considerable force, the sector. We remove the rod by unscrewing the screw securing it. Using a narrow screwdriver, unscrew the mixture quality adjustment screw and remove it along with the rubber o-ring. Finally, remove the rubber o-ring from the fuel intake pipe of the idle system.

That's all! The carburetor is ready for cleaning, adjustment of individual parts and complete tuning.

Preventative work

There are quite a few components in 2107 that require attention. In order to prevent the operation of the carburetor, it is cleaned and all systems are adjusted. For ideal operation, the VAZ 2107 carburetor setting itself must be ideal! It is not surprising that the mechanism quickly becomes clogged. This occurs when dust particles passing through the air filter collide with oil droplets. This mixture very often settles on the carburetor body. Dirt flakes can get into the float chamber and also clog the jets. Try to check the carburetor from time to time.

To prevent this problem, they came up with one way. To prevent dirt from getting into the balancing holes, they need to be raised a couple of millimeters higher. For this you can use polyethylene tubes with a thickness of 1 mm and a diameter of 5 mm. They must be inserted into the holes so that their protrusion on the side of the floats reaches 2-3 mm. Using a soldering iron, you need to flare them. The second end of the tubes may coincide with or be higher than the cap.

This modification ensures that now large enough dirt particles will not be able to get into the camera. The jets will also not become clogged with them.

Repair kit

In order not to worry once again that your carburetor may be damaged in the most inopportune place, it is recommended to always have a repair kit with you. It will help you easily and cost-effectively repair a faulty element. Most often, problems can be caused by wear of gaskets, valves, and diaphragms. Many of the car parts are subject to wear: battery, timing belt, cylinder head parts, hydraulic compensator, generator (brushes), muffler, panel. Even if it is a miniature device, like the ignition relay, which is used to turn on the starter, it still plays an important role. And usually all repairs boil down to the fact that these parts are successfully replaced. In most cases, these kits contain everything you need.

What may be useful for work

If suddenly the car owner began to notice some changes in the operation of the engine, for example, it stopped starting “hot” or there was instability in idle speed, it is necessary to correctly adjust the VAZ carburetor, as well as correctly adjust the idle speed of the car.

All settings are made in order to achieve stable operation of the power unit at idle with a minimum crankshaft speed.

To determine the crankshaft speed, you may need a tachometer. Some cars have a built-in instrument panel, among which there is a special connection for this device. In such a situation, it is advisable to use it. Otherwise, use a separate device (multimeter or autotester operating in tachometer mode). However, to take more accurate indicators, it is best to connect a separate unit. This will be much more convenient in terms of operation, in addition, all adjustments will be made more accurately and efficiently.

Experienced car mechanics, who have had their fair share of experience in this matter, can make adjustments by ear. To rotate the quality screw and the quantity screw, other craftsmen who do not have much knowledge may need a slotted screwdriver with a blade width of no more than 3 millimeters.

What do we have after proper adjustment of the carburetor unit of the “six”?

Checking the adjustments of the fuel mixture preparation unit is the same important maintenance step as monitoring the condition of the car battery. An integrated approach to setting up the carburetor guarantees not only a comfortable mode of movement, but also a lot of useful points:

An increase in power and a confident increase in speed.
No failures in the operation of the internal combustion engine in the low and medium speed sector.
Improved dynamic characteristics - the car picks up speed faster and accelerates in a short time.
Optimal engine response, which is expressed in the responsiveness of the gas pedal.

The listed qualities make it possible to effectively use the combustible mixture, which is necessary both in urban traffic jams and on country roads. Therefore, proper adjustment of the carburetor unit will help the car gain speed in a timely manner and complete the planned maneuver.

Adjustment of the VAZ carburetor may be required in various cases: after its repair, after repair of the gas distribution mechanism, ignition system, and even after changing a dirty air filter. Another reason is the transition to winter operating conditions of the car or, conversely, to summer operation. It should be borne in mind that it is possible to correctly and accurately adjust the VAZ carburetor only with the help of a special device - a gas analyzer.

Such a device is available to service station workers who perform work on repairing and adjusting carburetors.

How to adjust a VAZ carburetor with your own hands without special instruments? Before you begin adjusting the VAZ-2106 carburetor, as well as to adjust the VAZ-2104 carburetor, several prerequisites must be met. First: the engine gas distribution mechanism must be in good working order and its valve clearances must be adjusted. Second: work must be performed with a working ignition system and new or fully working spark plugs installed

The third important condition is that the Ozone carburetor itself must be in good working order, its float chamber must be cleaned and adjusted

Adjusting the fuel level in the float chamber is shown in a video by car enthusiast Konstantin Ovchinnikov from Ukraine.

Actually adjusting the VAZ-2105 carburetor consists of setting stable idle speed in a given range. A special feature of Ozone carburetors is an autonomous idle system, that is, fuel is supplied to the engine in this mode bypassing the throttle valves. The idle speed is adjusted using the screws for the amount of fuel mixture (1) and the quality of the fuel mixture (2).

It must be performed with the engine warmed up to operating temperature (about 80 degrees). This can also be done during the carburetor adjustment process. With the engine not running, both screws are screwed in all the way, and then the mixture quantity screw is turned back 3 turns, and the mixture quality screw 4-5 turns. The engine is started and the engine speed is set to around 800 rpm using the quantity screw (by tightening or unscrewing it). It is better if this value can be determined using a strobe light or tachometer on the dashboard. After this, by tightening the mixture quality screw (thereby depleting the fuel-air mixture), we determine at what position the engine speed begins to fall and becomes unstable. From this position, unscrew the mixture quality screw by 0.5 - 1 turn, slightly enriching the mixture for stable engine operation at idle speed. You can try revving the engine to make sure that the idle speed remains stable and is in the range of 800 (+50-50) rpm.

The above operations can be repeated 2-3 times to ensure the correct result. Generally speaking, the task of adjusting the carburetor is to ensure stable engine operation at the appropriate idle speed with the leanest possible fuel-air mixture and, accordingly, the lowest CO level.

Everything described is also true for adjusting the VAZ-2121 carburetor. The VAZ-2107 car is equipped with Ozone with a forced idle economizer, but the VAZ-2107 carburetor is adjusted in the same way. But the adjustment of the VAZ-21213 carburetor is somewhat different, because This model has a Solex carburetor.

Preparatory activities

If a motorist is interested in adjusting the Solex VAZ-2107 carburetor with his own hands, he must first carry out a number of preparatory steps.

Initially, you need to warm up the power unit to operating condition (temperature 85–90 degrees).

In the next step, you need to squeeze the handle of the air damper drive mechanism all the way; people simply call it “choke.” After this, the damper should be in a position in which the air channel is completely free, i.e., located in the direction of air movement.

If there is a tachometer, the device must be connected to the engine being turned off. Otherwise, if there is no unit, the item should be skipped. The positive side of the device should go to the ignition coil, and the negative side should go to the “ground” of the vehicle (body, engine or battery negative). Before connecting the device, you should read the operating instructions.

The last action should be to start the engine, turn on the high beam optics and the heating device.