And the answer is:
All field windings check out...
All installed capacitors check out... values and condition
Factory error: the connector from the run cap to the centrifugal switch was flopped over the connector from the start cap -- and vice versa.
The actual internal design of the Emerson motor is NOT shown on the Internet nor in the literature.
Pretty amazing, no?
The way this Emerson motor works:
At start the switch is in position one and the 50mFd start cap is in the circuit to the start windings.
Upon reaching the magic speed, the centrifugal switch shifts to position two and the 50mFd cap is cut out entirely.
However, in position two, the run capacitor (10mFd) drops in to the circuit.
The centrifugal switch is obviously in mass production and is to be expected in all recent motors built. (Forty-years +)
None of litureture ever references this dual connection centrfugal switch... a rotary version of "normally closed" "normally open" logic.
BTW, taking the Gast/ Emerson motor apart was quite a challenge. Fortunately I had a hammer and a temper.