Yup somebody diffently whacked something along the life of the machine. I have never seen or heard of anyone putting a 250r front end on one, I'm pretty sure but am sure someone will correct me if i'm wrong, but the 250r front end does not fit on a sx, the steering stem size is larger. However a 200x front end does fit. I have that mod on mine. If your fork tubes arn't bent you may just want to replace the triple tree assy to get the correct rake back. Running the diffrent fron end(200x) the machine will track better and change the handling slightly. It does however give a better ride. You have to use a bit more body english to control it, with the narrower front end on it. I have a couple triple tree's laying around if you want to go that way, or you can just upgrade to a 200x front end.
Own 86 250sx
85 350x
sold 86 250sx
110, 185s, 200s, 250es
Project 85 250r
If everyone else is looking down at you, Get a ladder..