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 - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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