there only one way to find out ,try it , I would say it would most kawi stuff swaps over or with a few mods .The link is a bit different on the 08 125 to the 250 08 by about 1mm to so it was the same thing for the 03 ,it most likely for the rising rate for rear suspension for the shorter swingarm on the 125, it should work okay ,by using the 125 swingarm on the 250 it will want to wheelstand easier it might be more fun like that?