Bob, thinking that I might be among the "some", and realizing that my earlier post had a tone harder than any I meant to take on teddy, my only argument for ignition timing contributing to dieseling is that if it's retarded enough to overheat the head after the engine has run for some time at speed, that overheating can add sufficient heat to the cylinder to contribute to dieseling (i.e., heating up carbon or metal burrs, or the whole environment, enough to ignite small amounts of residual fuel) that wouldn't get that hot with good timing. Seen it enough times with motors timed "by ear" not to suggest it as a cause.
I am not speculating and would not suggest that a mistimed spark is firing the motor after it is disabled (apart from the backfeeding issue which, of course, has nothing to do with timing).
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