06 yz450f no spark

my son was riding his bike and took a break and the bike would not start . got it home checked the timing and was ok then checked the spark and was none so i unpluged the kill switch and still none traced all the wires and no bare wires or nothing grounding out. not sure if its the coil ,stator.cdi box

any advise would be helpful

I had the same thing happen to me, running one minute, stop and then no spark. Do the ignition system test (as per manual). Check coil resistance, cdi resistance, source coil 1 and 2 resistance. My bet is source coil will fail the test, which will mean a new stator. That was what happened with mine.

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