RWilson, I think Spare was trying to say that a plugged fuel tank vent coupled with the engine sucking fuel out of the tank would create a vacuum and prevent the primer ball from functioning properly.
I want to hear more on the dieseling theory. What would get hot enough in such a short timeframe to cause it, carbon, the spark plug itself? AND Would a lean run condition cause it to rev up worse? I know when I run my 2-strokes out of fuel the RPM's pick up just before they shut off.
Could the motor have been choked off by pushing the key in?
What a crazy thing. If that happened in gear, in Shem Creek, you wouldn't be able to take it out of gear and the results would have been interesting to say the least.
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