If you have a test light or volt meter, check for power at the + terminal of the coil with the ignition on.
If not, there could be a problem with the ignition switch, or wiring.
If power to the coil, check the points. Be sure they are adjusted properly. Move the test light or volt meter to the - side of the coil. With the ignition on, and the points open, there should be battery voltage on the - terminal. With the points closed, there should be no power on the - terminal.
Each time the points open there should be a good, hot, blue spark from the coil. Lay the coil wire about 1/2" from a metal grounded surface. It should jump the gap. Try this while cranking. If no spark while cranking, could be the battery is low/bad, dirty or loose cable connection, ignition switch is bad, starter is dragging.
Next check for spark at each plug. A good test is to take an old spark plug, break the electrode off, connect a plug wire and ground the metal part of the plug. The spark should jump from the center to the metal case, about 1/4". Try this with each plug wire. If there is spark at the coil, but not at the plugs, there is a problem with the cap/rotor, or plug wires.
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Today's Featured Article - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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