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The following is assuming the engine has a 12 Volt ignition system with a round-can, automotive-type coil, rather than a magneto system, with the coil under the flywheel. Take a test light, and check for voltage at the (+) side of the coil, with the switch on. You should have voltage to that terminal, fed from the ignition switch. Once you have verified that you have voltage that far, move on to the (-) (points) side of the coil. Try to start the engine, while checking the (-) side of the coil with the test light. The light should blink along with the points opening and closing, and if it does, you should have spark at the plug. If the light is "on" and does not blink, you have an "open" connection between the coil and the points, or miss-adjusted or dirty points. If the light is "off", you have an open coil, a short in the wiring between the coil and the points, a shorted condensor, a short at the points, or the points are not opening.
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