So, friend Dave found the fiche for this. This is the email he sent:
Hi Guy, Well I looked up the parts fitch on the bike, and that ing. system is box stock 1984 KZ550. It must have been one of the last ones made, they switched to that system from the mech. advance to electronic. The parts book shows that system sans advancer. So we move on to another fix. Thanks for your input, Dave
Guess that answers our question. It wasn't even aftermarket.