Have you tried checking the spark and the fuel in the fuel bowl as as soon as it dies?
That might telll you where to begin looking for the problem. If it cutS out when you try to shift, I would expect a fuel problem.
But start it up and let it idle till it quits and immediately check the spark. If it's the requisite FAR AND BLUISH-WHITE, the color of lightning. then repeat and check the fuel in the fuel bowl of the carb by removing the plug and looking for A CONTINUOUS GUSH of fuel. If it's intermittent or dribbles then you are not getting a good delivery of fuel bowl of the carb.
If the furel delivery is good, then check the adjustment. 3/4 turns out on the idle air and 1-1/14 turns out on the main jet are good starting points. Make sure that you don't have any leaks around the carb metering section(throttle shaft, carb to intake manifold connection, rust holes or cracks in the intake manifold or manifold gasket at cylinder head connection).
If you don't have a good spark, check the point setting, the point condition( burned, oily, corroded, etc) and the connections in the primary ignition circuit. Make sure that you have battery voltage on the distributor side of the coil WITH THE POINTS OPEN AND near zero volts WITH THE POINTS CLOSED. Jump across the key switch and start the tractor and see if that fixes the problem. Key switches go bad. They get a high resistance, after about 2-5 minutes of being closed.
Systematically check these issues out and you should find the problem.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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