The problem started a few miles out of Milwaukee. Sean's bike began misfiring and had no power. He thought that it was a loose points wire, which had happened a couple days earlier, but he tightened it and it didn't help. Ultimately we limped the 75 miles to my home, tried a bunch of stuff and finally fixed it by swapping the 1-2 wires, plugs, points and condenser. It was the points that seemed to finally do the trick.
Sean and MJ are riding back to Kalamazoo tonight. I haven't received a call, so I am assuming all is well.