My experience on JD Model "B" tractors is that if they were running well and started what you mentioned (or did it when attempting to start), it well may be moisture inside the mag..
It may not even be enough to visibly see either..
Many times, after setting over-night in the field, they would take an hour to get started and sometimes we had to wait for the morning Sun to shine into the opened up Mag, to get them started..
A Mag-equipped tractor that has been setting a good while may well get moisture inside the Mag after the first couple of hours use, as the moisture is evaporated out of the crankcase..
Once every couple years, you should clean the Mag Points and wipe the Rotor and inside of the Mag Cap, to clean out any Carbon..
After all these years, I still have NO problem liking a Mag..you just may need to remember this..
I think Mag problems happen very seldom, if the above is taken to caution..
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Today's Featured Article - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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