Engine idle adjustment
After completing the preparations (see Solex Zenith 35/40 INAT carburetor) adjusting screw 1 (see photo) amount of the mixture, set the idle speed to 900±50 rpm.
Unscrew the screw plugs from the exhaust manifolds and screw in screw plugs 130 020 instead.
Attach the gas analyzer and adjusting screws 2 (see photo) quality (composition) mix to achieve carbon monoxide content (SO) in exhaust gases within 1.0±0.5%.
If the idling mode has changed slightly at the same time, correct it with screw 1.
Warning. If the position of the adjusting screw 1 of the idle mixture amount is changed, it is necessary to adjust the starting gaps of the air damper.
Checking the performance of the vacuum shock absorber of the throttle valve of the 2nd chamber.
Make sure that the air damper moves freely and the throttle valve of the 2nd chamber is closed.
Start the engine at idle. In this case, the shock absorber diaphragm should pull lever 3 to the stop (see photo).
Pinch the vacuum hose 4 and move the choke several times.
If the lever 3 is pulled up to the stop with each movement of the air damper, then the shock absorber diaphragm is working.