I was coming home from work the other day on a slight down hill hitting some pretty nice speeds and suddenly lost all power. The engine still turns over freely but it won't start. I'm pretty sure it's something in the ignition system. There was no noise or anything when the failure happened, it just suddenly lost all power at peak RPM. I don't know a ton about these ignition systems, so is there a common failure point on them? I'm on a 1978 Free Spirit with an E50, treats 50cc cylinder, jammy pipe, 14 bing with I think a 72 jet, mesh filter, 17/45 gearing.