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 - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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