Thanks everyone for the education I've received on the limitations of the CB500's charging system and how to reliably equip one with 3 ohm coils.
These orange colored Andrews brand coils do measure 3 ohms, I previously measured them with an inexpensive meter from a certain tool store....
But today I measured 3 ohms across the primaries of both coils and I think it was 14K across the secondaries, but with a low degree of variation between the two coils using a higher quality meter.
We have the coils installed along with a 'resistor pack' to bring primary resistance up to 4 ohms.
-Alan