For my XS650 Yamaha I bought new from "Sporting for Less" and had to change all of the jets. They said the carburetors would be jetted for the 650, lied to me and others not even close. Anyway I bought VM34 round slides and they work very well after jetting. I ported my heads, stock cam, and two into one selfmade headers.
So you're sporting dual 34mm carbs?