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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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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