If you don"t have spark when it quits then you"ll have to find the problem in the primary ignition circuit(battery to key to coil to distributor to ground). Check the points for burning and replace the condensor.
Is it converted to 12V from 6V? If so, what type of coil do you have? There are "real" 12V coils that have ~3.2 ohms of primary resistance and there are~ 1.6 ohm coils that need a ballast resistor in series if used in a 12V ignition system. If a 1.6 ohm coil is used without a ballast resistor, the high current will cause the coil to overheat and short internally. When it cools off, it will run but overheat and short again. You could also have a high reisitance in the keyswitch that cause it to get hot, increase it"s resistance and cause a weak spark. You may have a loose wire somewhere that"s grounding out the igniton causing it to die. Systematically check these things out and you should find the problem.
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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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