I've still only ridden the bike around the neighborhood. I'm still trying to sort a rich condition. Plugs are fouling out and they are soaked in gas. Tonight I tested the coils. They seem fine and showed right at 4.6 ohms each (for 5 ohm coils). The wires, however, were in terrible shape. They are very dry rotted and 2 and 3 fell apart. An inline spark tester showed very weak spark. It's amazing the bike runs at all with 40 year old coils and wires. I'm still learning as I go here but is it safe to say that better, hotter spark will burn more fuel and alleviate some of that rich condition? The wires are actually part of the coils on the 500 and 550 motor. So you have to do everything at the same time. I could splice in new wires and that would probably be a fine route if I were just looking to sell this thing. I could buy stock coils/wires for about $100 but then I may have to deal with this again at some point. Or I could buy Dyna coils and be able to replace the wires as needed for about $160.