OK - if you have an M distributor, the "timing going away" could indeed be the problem. Here's what I'm thinking:
The stock SMD distributor has an 7 deg advance. The stock M distributor has 40 deg advance. However since the M distributor is being spun "backward" on an SMD, the 40 deg advance actually becomes 40 deg RETARD.
Consequently if the distributor is timed at correctly at TDC with the engine stopped, when the RPMs come up the timing will be 40 deg AFTER TDC, not the 7 deg BEFORE TDC the engine requires. Ie. the timing will be retarded 47 deg from ideal at speed.
Ideally installing the correct distributor for the SMD is the fix. However you can probably get it to run using the M distributor if you disable the centrifugal advance mechanism so the spark occurs at TDC regardless of RPM.
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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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