I've talked to several people about it. best idea we could come up with is once the engine was at a higher rpm( it ws at fast high idle) with no load, it started dieseling. Cutting the engine off(same as pulling the kill switch) would just short out the ignition, but at this point it was running with out spark, kinda like the top fuelers do when the ignition fails. the engine kept getting to  higher rpm, i was fumbling with the throttle, couldn't figure anything out, so i grabbed the fuel line and kinked it closed. I kept fiddling with the linkages, trying to get the rpm down, when it finally started slowing down as it used up the fuel in the bowls. I really don't know exactly what stopped it, I was doing three or four things at one time when it started slowing down. i never seen one do it before.
		 
		
		
		
		
		
		
			
		
		
		
		
		
	
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