WRNGG
Check EVERY nut and bolt...check your exhaust pipes for any gray dull leaks and tighten up any clamps. have you had the proper cam/valve adjustment done like the book calls for? did it do it before you took it in, or is it due? I'd get it into the Service dept and then let Kawasaki be responsible should she "blow up" on you. Cover your bases and check out your bike real carefully. I had the same problem once on competition "Y" bike and it turned out that it maus have been the resonant frequency of the darn license plate frame, even though it was tight. It took me about a week of removing pieces of my bike, yes, including the complete fairing, it was driving me crazy...turn signals were changed from one side and front to rear...front fender removed..whenI removed the back tail light assy it quit, so I put it back on and tightened the Cr**(ud)ha, out of it and it did it again! I replaced the bulbs ater ptutting electrolyte grease on them, i all but broke the screws/plastic tightening them on the tail light...then i removed the license plate, put it back on without the frame, jsut like on a car they will vibrate...and Problem solved...Hope yors is this easy...PLEASE let the FORUM know how you fix it...this is a place to learn and have fun...most of all share what we learn...