today i will time exactly how long the fuel takes to start pumping and report back

i will try to familiarize myself with the screws and parts carbking mentioned.
just curious-if the motor ran ok at one point and the screws were not touched what would cause them to go out of adjustment?

(5) "there is a vent in the very top of the carburetor in the general area of the choke"..........
is this that brass tube cut on an angle?
and am i correct in understanding i should squeeze about 4-6 ounces of fuel inside that tube the equivalent of an old ketchup or mustard squeeze bottle?

(7) "feed a teaspoon of fuel to the engine as you have been doing"..........
meaning prime the carb again with gas not starting fluid?

thank you