You can find a free repair manual for the 200X at this site. That should help.rebuilding a 2oox rear axel, need tips and or tricks on getting it apart.
Sorry, I don't have a link for a manual for a 250X.I am sorry,this is a four wheeler,[ must be a 250]do you have a link for for a free repair manual for it.
I guess it depends on if you're going to replace the axle or not.I always just leave the sprocket on and take the chain off myself