Re: What causes run-on?

Posted by RAB on October 07, 2004 at 16:41:27 from (195.93.34.11):

In Reply to: What causes run-on? posted by Dug on October 07, 2004 at 15:50:56:

As you probably know it is caused by something in the cylinder(s) which is glowing hot enough to ignite the mixture, generally before TDC which is why it "knocks" and is not good for the bearings.
That something in the clinders could be a too-hot grade of plug (and the tip glowing red hot), or it could be carbon build-up which is heated but not getting cooled by the incoming charge, or it could possibly be a small area of the head overheating - a design problem. It is often overcome temporarily by your method, but if you are "only treating the symptoms and not curing the disease" it will probably re-occur. Carbon build-up can be from fuel or oil, so overhaul might be the answer, or carburation changes, or a simple plug grade change might be the answer. Gas-flowing and polishing the head could be a way round it if you are into that sort of thing. Really depends on what is causing it!
Regards, RAB

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