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Dang Morris, you must have been really thrashing on it.
This spring Dad's little John Deere tractor developed a miss. Its a small 3 cylinder gas engine and when you lose one cylinder you know it. It turns out that it bent a pushrod (I don't think Dad had ever adjusted the valves). I pulled the valve cover, beat the pushrod back into straight (mostly) set the valves and away we went. Yeah, yeah, yeah, it should have been replaced but coming from John Deere that was probably a $200 pushrod....lol
Dang Morris, you must have been really thrashing on it.
Old, stale gasoline will supposedly do this too, diluted with fresh gas or not. It burns, but leaves a glue-like residue on intake valves &c that sets up after shutdown. Then the next time the engine is started, things get ugly.