Bike is a 2009 non ABS with 51 k, around 50 k star hearing a noise when pushing it out of the garage , tough that might be the driveshaft splines, but having the drive shaft out I spin by hand the gear where the shaft is connected at front side and noise is coming from inside bevel gears case...
This is the recording of the noise with bike on center stand and spinning rear wheel forward by hand
https://www.youtube.com/watch?v=iL8YJJaf1i0
The bevel drives on the C14's fail once in a while...they start to click, or get loud and 'clunky'. Broken tooth, bearing, etc.
I've not heard one myself, but that's what I'd suspect.
I don't think you'll find much advice on the topic unfortunately...for most of the posts I read, the owners took their bikes to a Kawasaki dealer for repair, and then they rarely ever come back with details.
Rem