hmmmm if its in really good condition and u really havnt riden it alot, then i would say about maybe 2500 or so, but it totally depends on how long u have had it. if its old and used, then maybe 2000 or like 1700. kk hope that helps a lil lol
do a compression leak down test on it, that way you'll know if the rings/pistion are in decent shape. Ke 's usually run for a decade, I see people riding them here around the lake and some are red 85 models