Posted by used red MN on October 20, 2023 at 15:24:04 from (68.46.31.28):
In Reply to: Re: IH 300u problems posted by tarment10 on October 20, 2023 at 13:13:15:
Many like to connect ignition timing and ..run-on.. In actuality timing has ZERO to due with the symptom of ..run on.. at least for the most part. When you shut off the ignition there is no longer spark being sent to the spark plugs so the ignition and or the timing it is set at no longer plays a role in cylinder ignition. The greatest cause of run-in is simply too high an idle speed or the throttle plate being set at a point that does not shut off the air entering the engine properly. This is usually caused by the throttle plate being held open by the idle stop to overcome a problem in the carburetor idle circuit. Operating your tractor longer and under load does increase it susceptibility to run-on just by higher engine temperatures. There is a possibility that slow ignition timing is increasing the temperature of combustion chamber residue like carbon which will indeed add to the possibility of run-on.
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