Scotty - You make a very good point - one I had not considered! Under certain conditions a grossly mistimed ignition COULD cause an engine to run hot enough after extended operation to cause dieseling at shutdown.
OTOH such situation would also be accompanied by some other somewhat dramatic symptoms: extreme knocking (timing too far advanced); glowing exhaust manifold/flames out of the exhaust (timing way retarded); extreme loss of power and overheating (timing too far out either way).
So I still submit it's probably not likely the average guy fooling with an old tractor will ever experience running on caused by bad timing.
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