Carburetor mixture control

We had cold sleet this morning in OSAKA today and Vocar 34 PICT3 carburetor in air-cooled VW Beetle 1302 was obliged to adopt the fuel-air mixture onto cold season, make it richer with turning mixture control screw(lower and smaller one) clockwisely 1/16 turn and idle speed control big screw counterclockwisely 1/8 turn. Spark advance is set at BTDC 10 degree as many owner's of Beetle do. I have never changed till now from hot Summer setting to cold Winter one. Scientific Physical Property that in the very cold condition, motors require richer fuel supply is exactly the same as model motors. In order to adjust the mixture by human capability according to the change of atmospheric condition, we should have an indispensable capability to know the actual mixture ratio immediately encountering the scenery of inconvenient motor in bad conditioning. Judge!, rich or lean now. This is a key to establish the most suitable mixture control from idling to maximum rotation. In the Radio controlled Model Airplane field, I have very often seen that Laymen destroyed their important self-fabricated airplane at the first flight because of lack of motor conditioning especially in the carburetor mixture setting. Even some factory young engineer shows unnatural correspondence at the flight site? Long nourished experiences might be required to make an appropriate reactions on to a carburetor setting and adjustment?

As an another story, I'm intending to modify OS 46LA motor into a pressurized fuel injection equipment applying the same YS pressure regulator component as done on 25LA and 32F. As I am doing to use in some eccentric way pulling out the surpassed capability of the original designing with big throat and pressurized fuel supply. Probably, additional digging of the 4th Shunyure port by myself might be required like an upper model FX46. The difference between them are the existence of crank shaft supporting bearings, but the use of the rotation around 11,000rpm would not make any physical difference? The lighter weight and the release from troublesome bearing maintenance would be convenient for me. Tuned silencer pipe is one of a choice for this 46 motor, this NOS motor would show remarkable performance in Sutkoi 40 maneuver airplane.