Sensitive Solex 34PICT3

The change of atmospheric temperature below 10 degree celcius obliged me to increase the fuel mixture on Solex 34 PICT3 carburetor equipped in VW 1302 Super Beetle today. As we know, air volume control screw is so sensitive to meet the sweetest point, 1/32 or 1/16 precise rotation causes apparent change of motor combustion condition. Found I some reliable way to do it, only the smaller one(volume control) can be done on it without touching idle control air way adjust screw, because too rich fuel supply condition looses motor rotation as to it stops. So the adjustment of volume control screw should be done within the condition of acceptable idle speed could be maintained. Anyway, realized I the fact that colder weather needs richer fuel mixture though we cannot perceive it in computer controlled fuel injection motor in recent automobiles.