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Stator tends to be on/off...it works or it doesn't. The voltage required to produce spark isn't much and it's not working the stator particularly hard to get it, which means that the failure to that particular coil has to be rather catastrophic and uncommon.
What I did to confirm my CDI as being the culprit was run a live ground from the kill switch wire. You have to cut the black/white stripe wire off the protion of the harness (you'll have to repair it later) and run a jumper that you can ground out. While cranking, touch the jumper to a ground and take it off...it you get an nice pretty arc then you're building charge but you're not getting the proper trigger from the CDI. On mine I could actually ground it a few times while cranking and get the thing to start sparking right.
Some bikes will let you do this test just by flipping the kill switch but a lot kill the starter with the kill switch off.
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