It did make the POP sound, and died at the same time. I have not tried to jump starter relay. The mufflers look okay from the outside anyway (it has 3 inch exhaust to the bumper). I will have to check the dist. cap when I get time. Do you think the pushrods, or valves would get damaged in any way from this? How about power valve in the Demon carb? The answer Andrew gave about the fuselink blowing, and overcharging, seems a good possibility.