Hi guys, I am looking at buying a '91 kdx250 from the paper. He says he just rebuilt the top end and it runs good. Only asking $900. What is the history on this bike and year. I had a KDX in the pst and liked it except it topped out about 40 mph.(it did go through all 6 gears as fast as you could shift though). Any opinios appreciated. I love my XR but am getting tired of the weight.