That's a good-sized Allen wrench, roginoz!I did a search on one of the other forums, and found out that it was 14mm. I'll leave the thread here, in case it's of value to others.
I hear you, Spec! Kawasaki calls out the nut (Ref. 92015) shown as "NUT, 14MM." Your hands-on experience carries weight, with me!OK we're talking about the end oposite of the threads yes? The axle nut takes a 17mm wrench.
My faith in Kawasaki remains shaken.Hold on I was right the first time, it's a 19mm nut.