You can bypass the wiring harness and plug the DESS post directly into the CDI/Brain Box thats under the motor. This will bypass the wiring under the hood and tell you if its the stator or the wiring.
The 1998 CK-3 did have alot of electrical recalls, it for one was a wiring update that replaced the wiring, because they did rub through and short out. The advise he is giving you is valid and good.
I have owned several of these and they had the same issues, stator or shorts in the wiring system. Even with as few as 800 miles. This year is also notorious for spider cracks in the primary clutch faces.
At one point one of these websites had recal or service bulletin updates and this information was public. You also can call your dealer, and they will inform you of the same issues.
The Stators do go out just like that. I rode one in 1998 across Lake Gogebic in the UP Michigan, parked at Hoop and Hollar, had a beer, cam out no spark, same issue!
That time it was the Stator!
Also check for mice damage eating the wires if you just pulled it from storage.