Here are the carbs off my 97, plus a set of parts carbs I picked up a couple years ago. The assembled carbs need rebuilt; they're a big part of the reason I'm parting my bike out instead of fixing it. The emulsion tubes need replaced. I rejetted these, with 125 mains and 40 pilot jets. One of the slides in the picture isn't any good; the hole for the needle jet is out of round, letting the needle hang up instead of dropping smoothly on deceleration. I'm only leaving it in the box because someone with better eyes and more patience than me might be able to pull the diaphram off it. There is one new needle jet in the bag of parts. $50 shipped in the continental US.
(http://i22.photobucket.com/albums/b316/jpaul54/GS500%20Parts/DSCN0970.jpg)