The thing is that all the fire crater pistons were supposed to be timed to 22 degrees btdc but the magneto has a set 35 degree advance ( spark lag). There was a special impulse coupler made for magnetos when used with fire crater pistons on the M. If you are satisfied with the way it runs ok, but if you intend to pull it heavy I am sure you will have detonation with a std magneto. Not good. I am sure you would have a smoother better running M with a 22 degree, properly tuned, battery ignition distributor on it.
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Today's Featured Article - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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