How to set up a Solex 21083 carburetor for efficiency

The purpose of the adjustment is to set the starting gaps ( "A" , "B" ) to ensure normal operation of the starting system and, as a result, a confident and stable start of a cold engine.
Gap “B” , between the edge of the throttle valve and the wall of the first chamber of the carburetor, appears when the “choke” handle is fully extended and the air damper is closed (the starter is cocked and ready for use).

Gap “A” appears when the engine starts and the diaphragm trigger mechanism is activated between the edge of the air damper and the wall of the first chamber.

If the starting device malfunctions or is incorrectly adjusted, it is quite possible that a cold car engine will not start or will start, but with difficulty, and will “flood” the spark plugs.

— slotted screwdriver (3mm)

— open-end wrench (7mm)

— open-end wrench (8mm)

— tachometer (multimeter, autotester operating in tachometer mode) To make adjustments without removing the carburetor from the engine.

If there is no tachometer, you can try to adjust by ear, but this is only if you have already dealt with adjusting and tuning carburetors and can distinguish between 3000 rpm of the engine and 3500 rpm. Such an adjustment is possible in principle, but will be very approximate. It is easier to adjust the starting device by removing the carburetor from the engine.

- a set of round probes or pieces of wire with a diameter of 0.85, 1.0, 1.1, 2.5, 2.7, 3.0 mm, depending on the carburetor model.

Before making adjustments, we check to see if the starting device is in order and we are wrongly blaming it.

Checking the operation of the carburetor starting device 2108, 21081, 21083 Solex

1. Remove the cover of the air filter housing.

2. Completely close the air damper by pulling out the choke.

3. The assistant starts the engine, and we look at the carburetor from above.

If the carburetor starting device is working properly, then during start-up (after the first flashes) it will open the air damper at a small angle (starting gap).

starting gap "A"

If you do not observe such a phenomenon, then there are only two conclusions - either the trigger device is not adjusted, or its diaphragm is leaky.

You can also take into account such versions - the screws securing the cover of the starting device are not fully tightened, the plane of the cover is deformed for some reason and does not fit tightly to the body of the device, which depressurizes the entire system.

We carry out the adjustment as indicated below, tighten the screws, change the diaphragm, grind the cover or replace it with a new one.

Preparatory work

We carry out the adjustment with the engine not warmed up.

— Remove the air filter housing.

Removing the air filter housing on the VAZ 2108 engine

Adjusting the starting device of the Solex carburetor without removing it from the engine

1. Connect the tachometer.

tachometer connection procedure

If there is a tachometer built into the instrument panel, then you can use it. 2. Pull out the carburetor air damper drive handle (“choke”) until it stops.

the air damper of the carburetor 2108, 21081, 21083 Solex is completely closed (top view of the carburetor)

The air damper completely covers the cross section of the first chamber of the carburetor.

3. Start the engine.

4. Press the edge of the carburetor air damper with a screwdriver and open it 1/3 (30 0 ).

open the air damper of the carburetor 2108, 21081, 21083 Solex approximately 30 degrees (1/3)

screw for opening the throttle valve of the first chamber of the carburetor 2108, 21081, 21083 Solex

6. Release the air damper .

7. Use a slotted screwdriver to turn the starter adjusting screw, loosen its lock nut with an 8 mm wrench and reduce the rotation speed to 2800 - 3000 rpm.

carburetor trigger adjusting screw 2108, 21081, 21083 Solex

8. Hold the screw with a screwdriver and tighten the locknut. The adjustment is complete.

Adjusting the starting device on a removed carburetor

Before making adjustments, it should be recalled that on the Solex carburetor 2108, 21081, 21083, with the air damper completely closed, the throttle valve of the first chamber should be slightly open, the second chamber should be completely closed.

1. Remove the air filter housing.

Removing the air filter housing on the VAZ 2108 engine

2. Remove the carburetor from the engine.

3. Turn the air damper control lever counterclockwise until it stops (the air damper is completely closed).

carburetor air damper 2108, 21081, 21083 Solex is completely closed

Solex carburetor design

The Solex carburetor has several models, namely:

The main modification of this brand of carburetors is SOLEX 21083. This model has the smallest diffuser cross-section. In terms of structure, all Solex models are the same, there are only some differences (different brands and models of cars have their own modification). Therefore, the Solex settings for all models are the same.

The Solex carburetor type is emulsion. It is installed only on cars with engines with contactless ignition.

Solex device:

• two chambers with throttle valves;
• chamber dosing system;
• transition systems for both chambers;
• idle speed system only for the first chamber.

Classification of Solex carburetors by configuration:

1. Semi-automatic starting system.
2. Carburetor accelerator pump.
3. Power mode economizer.

Have you heard about a car device that can reduce fuel consumption, the FuelFree fuel saver?

Setting the transient mode of carburetor operation

At idle speed, the carburetor throttle valves close and a high vacuum area is created under them, which allows gasoline to be “sucked” out of the idle channel through the nozzle. If the damper is opened sharply, the vacuum decreases sharply, which disrupts the normal operation of the main dosing system of the first chamber and a failure appears.

To eliminate these symptoms, adjust the idle jet or accelerator pump nozzles. The adjustment must be made on a warm car engine.

The idle jets or accelerator pump are changed one by one to prevent dips and delays when you press the gas sharply.

You may need to adjust the idle speed a little. Over-enrichment is not transiently displayed as black smoke coming from the exhaust pipe.

Do-it-yourself interior tuning. How to do this and what is needed for this can be found on our unique website.

From here, you can learn how to do tuning a Chevrolet Niva with your own hands.

In this informative article, you will learn how to polish a windshield with your own hands.

It is recommended to install an accelerator pump with 40x40 nozzles, and an idle nozzle with parameters from 35 to 40. If there are dips from a lean mixture and it is not possible to adjust the idle speed due to the idle nozzle being too large, then both accelerator pump nozzles can be placed in the first camera as shown in the picture.

How to set up a Solex carburetor

The best carburetor is SOLEKS. Therefore, many drivers replace their standard carburetors with devices of this type. Solex works clearly even if there was a strong overflow of fuel. As it turned out, many people have difficulties in correctly setting up the Solex carburetor. It must be configured so that fuel consumption is minimal and power is maximum, so you need to look for the “golden mean”. Therefore, those who do not want to learn the subtleties and nuances of setting up give this job to a professional.

But, for those who want to learn how to adjust and configure a Solex carburetor, we will describe the correct procedure:

1. It is necessary to set the level in the float chambers. The manual (instructions) states that the level can be set using a special template. This is difficult if there is no factory setting. If there is no factory setting, you need to do it yourself. How to do it? To do this, start the internal combustion engine and warm it up for about 10 minutes. Next, turn off the engine and disconnect the fuel supply hose. When the hose is disconnected, gasoline flows out normally, but fuel must not be poured into the chamber, otherwise the readings will be spoiled. Next, unscrew the carburetor cover bolts and remove the choke cable. After disconnecting the cable, you must very carefully and horizontally remove the Solex carburetor cover. If you do this carelessly, the floats may be damaged. Now you need to measure the distance from the Solex cap to the surface of the gasoline. It is necessary to measure in each chamber; the fuel level in them may be different. To determine whether the level is normal or not, you need to add the two resulting distances and divide by 2, that is (distance of camera 1 + distance of camera 2)/2. If the measured distance is between 25 and 35 mm, then everything is normal. If the level goes beyond the limits up or down, then you need to adjust the level. To do this, bend the float in the desired direction and drain some of the fuel.
2. We adjust the idle speed of the internal combustion engine. It often happens that when you press the clutch pedal, the engine speed immediately drops - this indicates that the idle speed has disappeared. To do this, warm up the car engine to normal operating temperature. Next, turn off the engine. In the hole in the Solex sole we look for the mixture quality screw and turn it to the right until it stops. Now you need to start the internal combustion engine and push in (remove) the choke. This screw is used to set the permissible minimum speed. This number of revolutions should ensure stable, stable operation of the motor, while the vacuum should be minimal. A well-tuned Solex carburetor should allow the engine to idle at speeds from 500 to 1200 rpm. After the engine begins to operate stably, we continue to rotate the mixture quality screw until the internal combustion engine begins to operate unstably, after which we turn it back 1-2 turns. Next, we proceed to setting the engine speed to normal; we need to make sure that the speed is in the range from 800 to 900 rpm. Turn the screw until the engine starts running stably.
3. When adjusting the idle speed, beginners often have difficulties. It happens when you turn the quality screw, the engine operation does not change, but the quality of the internal combustion engine must change. When the engine is unstable, the mixture quality screw can be adjusted. If the engine does not respond to changes in the adjustment of this screw, then fuel continues to flow into the idle channel, the screw cannot close it. This may be due to an enlarged nozzle (hole for metered fuel supply) or due to a poorly screwed plug, as well as a deformed nozzle. This can be done by carrying out a simple diagnostic procedure: with the engine running, you need to unscrew the valve - here the engine should stall. If the problem is in the enlarged nozzle, then the internal combustion engine will suddenly turn off, and if the internal combustion engine does not stall at all, then gasoline is not supplied through the nozzle. In this case, when the engine does not stall with the carburetor valve removed, then we check the stopper screw of the second chamber. The locking screw is used to smoothly open the throttle valve.

Adjusting the fuel level in the float chamber

Maintaining a normal level of gasoline in the float chamber is an important condition; if it is not met, malfunctions in the operation of the car occur:

• if the level is below normal, the engine does not have enough speed, power decreases, and gasoline consumption increases;
• if it is higher than required, fuel consumption also increases, and even more.

Setting the fuel level for the VAZ-2108-09-099 is quite simple, and in this case it is not at all necessary to remove the carburetor. The procedure for adjusting the position of the floats is as follows:

• remove the KVF assembly with the filter element;
• disconnect the choke cable, fuel hoses, EMG power cable;
• unscrew the five screws securing the carburetor cover;
• turn the lid over, take a drill with a thickness of 1 to 2 mm and take a measurement between the gasket and the lower surface of the floats - this distance should be exactly within these limits, and the same.

You can also measure the fuel level, but before carrying out such a procedure, it is necessary for the engine to idle for several minutes. The distance from the upper edge of the housing to the surface of the gasoline is measured; according to factory conditions, it should be 25-26 mm. Another way is to measure the distance from the gasket to the top edge of the floats with a caliper; it is 34 mm (with the cover upside down).

Another measurement method is using a specially made template.

Important conditions when setting the level:

• the floats must be located parallel to each other, along the lid;
• they are installed strictly vertically, without distortions;
• when lifting the float pair all the way up, the distance from their lower corners to the gasket should be within 15 mm;
• the adjustment of the extreme positions during adjustment is carried out by bending the tabs on both sides;

If the floats inside the chamber are installed skewed or not strictly vertical, they may rub against the walls of the housing, causing gasoline to overflow as a result of sticking.

How to check Solex

To ensure high-quality work on adjusting and tuning the carburetor, you should ensure that sand particles, etc. do not get on the throttle valves. If solid particles get into the carburetor, this can lead to an expensive overhaul of the internal combustion engine (due to some small thing).

After you have adjusted the carburetor correctly, you need to check the accelerator pump. When the throttle valve is opened slightly, the nozzle should spray gasoline. Here is the answer to the question: why does the car jerk when driving? If a stream of gasoline from the sprayer appears late, then this precisely leads to braking when you press on the gas and the car jerking.

To clean the carburetor, it must be disassembled. First, we unscrew the fuel and air jets, as well as the emulsion tubes. If it is difficult to remember what is where in the carburetor device, then it is most convenient to photograph each step.

To determine whether the diaphragm is intact, unscrew the cap of the power mode economizer.

Signs of a broken carburetor diaphragm:

1. The internal combustion engine does not stall when the screw is tightened.
2. If you turn off the ignition, the engine continues to run for some time, that is, self-ignition occurs.
3. Unstable operation of the internal combustion engine.
4. Increased gas mileage during normal, moderate driving.

ECTO or EURO? What brand of fuel is best to fill in? ECTO fuel is not recommended for use in cars with high mileage.

After checking the integrity of the diaphragm, we clean the SOLEKS. For cleaning we use air pressure (a compressor or pump is needed). If the dirt is hard and does not fly off with a stream of air, then carefully clean the stuck dirt with copper wire. I use air pressure cleaning without damaging the surfaces of carburetor parts. After this, close the lid and now you need to lubricate all the rubbing surfaces of the carburetor parts. It should be lubricated after washing the outer part.

Recommended Method

Level control technology includes a number of stages:

1. We dismantle the housing of the air filter element. To do this, unscrew the fastening nut of the housing cover, unclip the latches, remove the cover, take out the filter and tighten the 4 nuts that secure the housing to the carburetor.
2. Raise the body and disconnect the rubber pipes. We move the body to the side.
3. Loosen the clamps securing the fuel pipes going to the carburetor and disconnect them.
4. Remove the wire suitable for the idle speed solenoid valve;
5. Disconnect the drive cable of the air damper (the “choke” handle);
6. Unscrew the 5 screws securing the carburetor cover;
7. Having removed the cover, we immediately determine the fuel level in the chambers by lowering a ruler or caliper into one of them until it stops (using its depth gauge). If the measurement shows a level of 25-26 mm, it corresponds to the norm and no adjustment is required;

If the amount of fuel in the chamber is lower or higher than normal, we perform a visual inspection and a series of measurements on the floats, and if necessary, we correct their position.

To carry out adjustment work, place the removed carburetor cover on a flat horizontal surface with the floats facing up.

First, we look at the position of the elements from above. The outer side surfaces of the floats are parallel to the special imprints on the gasket. Deviations can cause the floats to touch adjacent elements and surfaces, causing the fuel level to be incorrect. If necessary, adjust the position of the floats by bending their mounting arms. The next step is to measure the gap between the floats and the gasket. A rod with a diameter of 2 mm is useful here - this is how much the specified gap should be.

If it does not correspond, we bend the tongue of the floats, with which they act on the locking needle. After this adjustment, we check the total height of the floats, which is normally 34 mm. If this is not the case, check the gap again, adjust it if necessary and measure the height again.

The last stage of setup is determining the working stroke of the floats. To do this, place a caliper near the float, mark the distance from its lower corner to the surface of the cover, then lift the float with your hand and mark where the lower corner is.

A working stroke of 15 mm is considered normal; if it differs, it is adjusted by bending the tongue.

Solex carburetor tuning

Tuning, that is, improvement, modification of the carburetor is carried out to increase engine power and improve driving dynamics.

Important! In order to achieve maximum power, there must be a minimum of resistance at the carburetor inlet. With high resistance, the quality of the mixture is not always “at its best” (sometimes “poor”, sometimes “rich”).

If you sharply open the throttle valve with the Solex carburetor set at the factory, the air flow speed decreases, as a result of which less gasoline is supplied to the carburetor. Because of this, power drops significantly at low speeds.

The procedure for increasing engine power by tuning the Solex carburetor:

1. We carefully disassemble the carburetor.
2. We wash and blow, and divide into two halves.
3. Pay attention to the air damper axis. There are protruding screws on this axis, which creates additional resistance while the car is moving. Any little things are important when tuning, so these protruding screws need to be smoothed out.
4. Remove the axle and air damper from the top. The axle needs to be sharpened.
5. From the lower part you need to pull out the throttle valves with their axles. At this stage, using a file we make the flaps larger. We hide the screw caps inside the axle. There are screws with conical heads, you can use them. The throttle valve needs to be assembled.
6. Now we are tuning the diffusers. To improve the aerodynamics of the diffusers, it is necessary to make the legs in the shape of wings. We also check the protrusions of the factory casting; if there are any, they need to be ground off.
7. The accelerator pump must have 2 tubes installed in one chamber. There is an opinion among some that when I use two tubes for each camera, “dips” may appear, that is, you press on the gas, but the car does not move.

In general, the basis of tuning is smoothing, erasing protrusions and irregularities. Any unevenness in the fuel and air mixing chamber creates resistance.

Reasons for increased consumption

Increased fuel consumption on the VAZ 2109 carburetor is the most important reason for car enthusiasts who ask questions about adjusting and repairing carburetors. So:

• Moreover, they all want to know how to make a carburetor economical in a VAZ 2109. While walking, many have no idea how to correctly determine fuel consumption
• Their mistake is that they take the operating gasoline consumption as the reference
• This is a big mistake
• The reasons for increased fuel consumption are:
• Inaccuracies in the readings of the device that monitors the fuel level in the tank, as well as errors in the speedometer and driving style (increasing consumption), which is typical for most young motorists
• They pour 10 liters into the tank and set the daily counter to zero, drive with engine warm-ups, stops, both on city roads and on the highway, while they want to drive 120 kilometers, which you will agree is stupid
• If any of you have ever installed a measuring cup (measuring container) when warming up the engine, especially during suction in the winter cold, then you know that the liter measuring cup is emptying before your eyes
• You can find out the fuel consumption of your car from the documentation; it is indicated, as a rule, for three main operating conditions - this is 90 kilometers per hour, then 120 kilometers per hour and city driving
• At the same time, the most economical mode is driving on a relatively flat road, the speed does not exceed 90 kilometers per hour, and using fifth gear, this is driving with the first chamber of the carburetor open
• If you increase the speed to 120 kilometers per hour, then the second chamber opens and fuel consumption naturally increases by 1-2 liters on average per 100 kilometers.

Video

This video shows how to clean a Solex carburetor

This video is about tuning the small diffuser of a Solex carburetor

This is a general video on improving the SOLEX carburetor.

With the development of the automotive industry, older models of carburetors were replaced by carburetors with the Solex brand. Unlike their counterparts, Solex delivers more accurately and helps the car develop more power. Such carburetors are installed on engines with a displacement of 1.5 liters, front-wheel drive VAZ cars, the Samara family: VAZ 2108; 2109, 21099, 2110.

Let's sum it up

The steps described above for setting up and adjusting a Solex carburetor are basic. In other words, if you wish, you can adjust the carburetor yourself, based on this information. Note that the accuracy of the settings can be further checked on a gas analyzer, after which you can make the necessary adjustments yourself instead of constantly contacting specialists. Finally, we add that a dosing device of this type lends itself to various types of tuning, all kinds of modifications and improvements. For this reason, when choosing a carburetor for a VAZ, it is not for nothing that many car enthusiasts prefer Solex.

Solex carburetor design VAZ 21083

The Solex VAZ 21083 two-chamber carburetor is installed on naturally aspirated engines of VAZ 21083 cars. It consists of a cover and a main body, which includes:

1. Float chamber.
2. Starting system.
3. Idle system with solenoid valve.
4. Main dosing system.
5. Transitional system.
6. Economizer with accelerator pump.
7. Econostat.

Fuel is supplied from the float chamber through special channels through fuel nozzles, where gasoline is mixed with air, which enters through air nozzles. The combustible mixture then flows through the carburetor diffusers directly into the engine. The throttle valve drive on this carburetor is mechanical and varies depending on the force of pressing the accelerator pedal. The carburetor provides for adjustment of the combustible mixture using quantity and quality screws.

Basic faults

Any malfunctions of the 2109 carburetor affect the performance of the engine: the engine may stall when the speed is reduced, run intermittently, not develop power, and consume gasoline beyond the norm. There are many reasons for problems with this unit, but the most typical of them are:

• clogging of the HDS and idle jets, both air and fuel, and in the solenoid valve (EMV);
• rupture (defect) of the accelerator pump diaphragm;
• failure of the EMG itself;
• loose fit of the locking mechanism needle to the seat;
• air leakage through the junction of the body and the cover;
• leakage of the float in the float chamber;
• clogging of the accelerator pump nozzle with dirt;
• misadjustment of screws XX.

Of course, various types of malfunctions can occur not only due to the carburetor, the engine itself is often faulty, and the ignition may also be set incorrectly, especially if the installation was carried out by an inexperienced technician without a strobe light. Problems with idle speed can occur due to a lack of power to the solenoid valve, so before disassembling the HRV, you should first check for voltage on this wiring.

Jet markings

For each carburetor system, jets of different cross-sections are provided, so during repairs it is important to know what cross-section the fuel or air jet is needed. When purchasing a car, it comes with a service book, which outlines the main characteristics and its structure, as well as a jet marking scheme depending on the carburetor model.

The main metering system has fuel jets marked 80 or 95 for the primary chamber and 100 for the secondary. There are also air jets 150, 155, 165 for the primary chamber and jet 125 for the secondary. The idle system includes fuel nozzles marked 38-44 and 50, and air nozzles 170 and 160. In the secondary chamber of the transition system, fuel nozzles 50 and 80, and air nozzles 120 and 150. For the main metering system, a fuel nozzle 85 is provided.

Adjusting the carburetor Solex VAZ 21083

For the carburetor to work properly, it must be properly adjusted and configured. This kind of work is not difficult to do with your own hands, you just need to be careful and don’t be afraid to make adjustments yourself.

To adjust the quality of the fuel mixture, you need to first warm up the engine to its operating temperature, then turn the fuel mixture quantity screw to set it to 800-900 rpm. Now, using a flat screwdriver, you need to gradually unscrew the quality screw until the motor starts up. Afterwards, the quality screw is very carefully tightened until the engine runs smoothly.

There are cases when, with such an adjustment, the engine operation remains the same and does not change. This is possible for several reasons:

• contamination of the quality screw channel;
• contamination of the fuel jet of the solenoid valve;
• Solenoid valve malfunction.

The solenoid valve may not work due to a broken chip or wires going to the valve, or due to a malfunction of the core itself. In this case, the valve is replaced with a new one, the dirty channels and jets are cleaned with compressed air.

Adjustment of the fuel level in the float chamber is carried out on the removed top cover of the carburetor, by bending the plate that holds the floats. Each float is measured with a special probe so that the gap between the float itself and the surface of the cover is within 1-1.5 mm. Precise adjustment of the floats will ensure constant maintenance of the fuel level and its uninterrupted supply. In addition, it is worth adjusting the tension of the air and throttle cables so that the engine can start in winter and run without interruptions.

Adjusting the tension of the air damper cable is carried out with the air choke pulled out from inside the car, tensioning and fixing the position of the cable on the damper drive. The tension of the throttle cable is also adjusted, that is, when the gas pedal is released, it should be closed.

Correct setting of the Solex VAZ 21083 carburetor will ensure a rational dosage of the combustible mixture at any engine speed, without excessive fuel consumption.

There are many different modifications of Solex carburetors, while the 21083 series is the basic version with a minimal diffuser cross-section. This model is usually installed on 1.5-liter engines of VAZ cars. We previously wrote about the “Ozone” setting on models 2106 and 2107.

The enormous popularity of this series is due to the possibility of grooving diffusers. Thus, almost any modification to the carburetor can be made. Experts do not recommend installing Solex on engines with a volume of more than 1.5 liters, as in this case the engine will be “choked” at high speeds. If you intend to configure this carburetor for the UZAM power unit, it is necessary to replace the jets due to the fact that a richer fuel mixture must be provided.

Setting up Solex

Adjusting the fuel level . Setting up a Solex carburetor usually begins with setting the required level in the float chamber. To do this, you must first start the engine and warm it up for 5 minutes. After this, turn off the engine and perform the following operations:

• Carefully disconnect the fuel supply hose.
• Unscrew the 5 screws that secure the carburetor cover.
• Disconnect the choke system cable.
• Carefully lift the lid to avoid damaging the floats.
• Using a ruler, or better yet a caliper, measure the fuel level in the chamber.

Setting up the launcher

• open-end wrench 7;
• open-end wrench 8;
• flat screwdriver;
• electronic tachometer or multimeter with its function.

1. Remove the air filter from the carburetor. Pull the “suction” towards you as far as it will go. Next, you will need an assistant to start the engine. At this time, you are watching the starter flap, which should open slightly after starting.

2. If this does not happen, it means that the starter is not adjusted.

3. We begin the adjustment. Warm up the engine, turn it off and connect the tachometer as follows.

4. Pull out the choke and start the engine. The suction valve must be completely closed.

5. Next, use a screwdriver to press on the edge of the damper, opening it 30 0 .

6. Using a 7 key, rotate the throttle position adjustment bolt until the tachometer shows a speed of 3200-3400 rpm.

7. Now use a screwdriver to rotate the starter adjustment bolt, having previously loosened its locknut with an 8 key, until the speed drops to 2800-3000 rpm.

8. In this position, holding the bolt with a screwdriver, tighten the locknut.

The adjustment process can be seen in this video

Possible problems when setting up XX

When the quantity screw is tightened, the engine does not react at all . This problem can occur when a large amount of fuel enters the idle diffuser. There may be several reasons for this:

• an XX jet of a larger size than necessary is installed;
• the plug or solenoid valve is not tightened properly, so gasoline is sucked in, bypassing the XX jet;
• The jet or its seat is deformed.

To identify the specific cause of the above problem, it is necessary to disconnect the wire from the valve while the engine is running, and the motor should immediately turn off. If this happens, most likely the wrong size XX jet is installed. When the engine does not stall when the power supply to the valve is turned off, it means that fuel is supplied bypassing the exhaust system, including the nozzle itself.

To eliminate the malfunction, first remove the plug or solenoid valve and check the condition of the nozzle and seat for any deformations. If the seat is damaged, you will have to replace the carburetor cover. If no damage or deformation is detected, put the jet on the solenoid valve and lubricate the o-ring with oil. Then we tighten the nozzle with a wrench, holding it with one finger without much effort.

Setting up the float chamber

This type of work allows you to adjust the optimal amount of gasoline in the float chamber. An incorrect level causes a decrease in power, uneven engine operation, and excessive fuel consumption.

Tools:

• set of wrenches;
• thin probe (diameter 1 mm);
• pliers.

1. Remove the air filter and unscrew the carburetor cover.

2. Carefully remove the float chamber cover.

3. Check the condition and position of the floats. They should be parallel to the imprints of the side walls of the float bath on the gasket.

4. If they are displaced, we align them by bringing them together or spreading them apart.

5. Next, lay the lid horizontally with the floats up and use a feeler gauge to measure the distance from the bottom of the float to the gasket. It should be equal to 1 mm. If it is higher or lower, we continue further adjustment after installing the carburetor on the engine.

6. When fuel is pumped into the float chamber, its level should coincide with the red lines, as shown in the photo.

7. If the floats are set incorrectly, this level will be lower or higher. Simple adjustment is carried out by bending or bending the tongue of the floats, then closing the carburetor cover and pumping fuel.

For details on setting up the float chamber, see here

How to choose jets?

The selection of jets for Solex 21083 is made taking into account the engine size. Experts recommend starting the selection with a fuel nozzle for the first chamber. Having selected the desired sample, we select the corresponding air analogue for it. And then in the same order we select the jets for the second chamber. First you need to look for a factory carburetor designed for the size of your engine, remove the jets from it and take them as a reference point. Further selection of jets is made according to this principle. If you need to lean the mixture a little, choose a larger jet by one pitch. If you want to enrich it, use a smaller jet.

Emulsion hoses are assembled along with the jets. These tubes are designed to adjust the composition of the fuel mixture in accordance with engine speed. There are three types of tubes: 23, ZC and ZD. The first are used for Solex 21083 carburetors installed on transverse chisel engines. For the first chamber of carburetors of UZAM power units, ZD tubes are used, and for the second - ZC.