Buddy has an '84 R100RT. After riding 150 miles the bike started dying suddenly. He could keep riding by turning off the ignition switch and then back on and it would seem to run fine while it was running but then die again. and it would occasionally have a nice back fire. Seemed to have fine flow of fuel, plugs looked good. The idle was just slightly rough. Thought it was heat related but we let it cool overnight and the problem was still there. Battery was nice and strong. Started the bike several times and starter spun quickly. What are the symptoms and checks for a bad ICU? My bike has points!