there's nothing strange about it! it is possible to mount a kickstarter in every xt600-model until today. i have done this even with a '98 model (which has the clutch lever on the right side and where there is no boring for the kick-starter axle).
also handlebar commands are Kick-version ..
sorry, what are handlebar commands? (lack of english)
Another question : I'me a little scared of the right rearframe/muffler/frame ..that use the muffler as a
stressed part : how it will behave in offroad when loaded ?
sorry, no experience with that!