Depends on if it is stock or not, so stock it will probably do a little over 30 if you know how. Once you start going fast on that particular ski it starts to bounce, so you have to lean way far forward to prevent this. With a new exaust and other mods you could maybe get it to about 40.
They are supposed to top at 180km/h I've seen mine at 140, with plenty of power left to keep accelerating.
I want to know how fast a Kawasaki KLX 125 kickstart will go?
In the gas, 40:1 ratio.
75
70 mph
50mph
it will go about 60 mph
72
500 mph
80 MPH
150 no problem
around 65mph