disconnect the engine harness from the engine(large cannon plug), spin the engine over by jumping the red wire to the yellow/red wire. If you now have spark, its the key switch, the kill switch, or the harness is grounded out. Use an ohm meter and check the black/ yellow wire to ground. Eliminate the kill switch first, then the key switch, Its like a lawn mower, it makes its own ignition, you have to ground it out to shut it off. If it doesn't make spark with the harness disconnected, its probably the stator. You can check stator output, but you will need a DVA adapter. Check with CDI electronics for more diagnostic tips, DVA adapter, and replacement parts. The trigger has three magnets, so if its bad, it generally(not always) usually looses 2 coils from spark, if the switch box is bad, it generally(but not always) looses three coils. Coil issues usually looses one at a time. Its very rare to have a coil wire issues.
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