Don't forget that the spark has to travel from the coil - through the wire- through the first plug - across the cylinder head - through the next plug - through the next wire back to the coil. In other words, don't test for spark at #1 with the wire off from #4. If you have a local Harbor Freight, you can grab a spark tester for $5.00. Don't trust ohm readings for testing anything that has an output - test for voltage. It looks like the pulse generator uses a pair of AC (alternating current) signal generators; when the magnets get weak voltage output also gets weak or disappears completely at low (cranking) speeds. Check out the wiring diagram at https://drive.google.com/file/d/0B8nSiz90rrfUNWs0YV9ENGp4TVk/view and look at the plug labeled 6P at the spark unit. Start with the white and blue wires for the 2-3 windings, set your voltmeter for AC, and crank the engine. Repeat with the yellow/white wires for the 1-4 windings. A good pulse generator should be putting out the same voltage on both windings. If the ohm reading is right but there's no AC voltage output, it's time for a new pulse generator. Hope that helps.
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