My CB750's charging system was not happy with Dyna-S and 3 ohm coils. Battery drained rather quick. Not possible to have headlight on. I had bought the kit locally so I could go back and switch the 3 ohm coils to 5 ohms and no further problems.
What's the meaning with 3 ohm coils? Only when running plugs with larger gap?
I used Dyna wires which were no good, graphite core wire that had intermittent function on one cylinder and messed up the carb jetting for long time. Standard wires with NGK 5 kohm caps and NGK D8EA plugs runs fine. Denso X24ES-U is OK too.