[Tommy]

Next time it won't start/run. Turn it off, remove the air cleaner, look down the carb, fully open the throttle and see if fuel squirts in. If it does, fuel is not likely the problem. If there is no fuel, then fuel supply likely is the problem.

When my MSD failed, it would start and run cold, and it had enough juice to run hot until I shut it down. Then it wouldn't start until it cooled. I'm sure there are other failure modes too.