The problem of uneven operation (engine troit) at idle due to 2 and 3 cylinders on VAZ classic (3 sometimes more) is known to many and one of the reasons is the runaway idle setting of Solex. But on the Internet there is only information that the idle setting is done only for 1 chamber. This is a mistake. Either translation errors, or Solex did not tell DAAZ about all the nuances. And as usual, the devil is in the details. And here too. Nobody says that in the 2nd chamber at idle air pulls gasoline from the PS hole of the second chamber), this is the basic principle of carburetion (any channel that will be in the air flow or nearby will supply gasoline, the only question is the quantity. So the nuance is that as a result, the consumption of the fuel mixture is adjusted, and not air. After all, the engine does not work in clean air, it also needs gasoline. In the video, why this is necessary, what it gives and one of the options for restoring the setting is proposed. The difference between new VAZs (2108-09) in a different intake manifold where the monopipe goes first and there should not be such a problem there in theory. You can also supplement the technique (in the future, other options may appear). If there are objections, it would be nice to provide arguments, and not general words. PS. After the video, I tried to adjust it a little differently (reduced the second). The adjustment is very subtle, since the carburetor is perfectly adjusted both on one and on two chambers. At some point, I was able to put 500 rpm and the engine worked like a clock (pay attention to the oil pressure, it is not worth repeating on a worn engine), i.e. an excellent balance of 1 and 2 chambers was obtained. But it was worth touching it a little more and everything went wrong. Due to the fact that the already small air flow at idle is divided by 2 more, the setting can go out at any time. But this way it is smoother and the toxicity should even theoretically be less. The technique that I came to for myself. I find the point of contact of the stop and the valve of the 2nd chamber and add 1 turn. I turn the idle screw by 2-3 turns. The quality screw by 5-6. I warm up the engine, remove the idle speed to 600 idle screws of the 1st chamber. If the idle screw is unscrewed, and the speed does not decrease, then I reduce the second. Then I set 700 with the idle screw and check the quality screw. I make stable revolutions. You don't need much, leaner is better (cleaner spark plugs). And once again. We make the operation uniform only with the mixture from the 2nd chamber. You can simply reduce the air in the 1st chamber by sucking in air, but it will not be smoother. Checking the settings. The engine runs more smoothly, reacts to the shutdown of the 3rd (4th) cylinder. If you plug the VZ from the PS of the 2nd chamber, it does not stall and the revs do not increase (the minimum is used). When you lift only the second damper, the revs increase. If the engine stalls, then most likely the PS of the 2nd chamber is clogged.