A trick I did on my 81 CB750K I did is to put a Relay from the Coils to the battery. So that when the coils have power, power comes directly from the battery instead of through all the switches in the wiring harness. I did do a ground up restore on the bike with new coils, wires and caps, and new procom igniters. So the only thing that is original in my ignition system is the pickup and advance.