I had a similar issue with my Aviastar .53 and it turned out that it really likes (read ,will not run) on anythign but 0% nitro. Did you ask the previous owner what fuel he was using? I know that a friend at the field has a 1.08 OS that will only run on FAI fuel. My Webra .60 only likes FAI as well. If you have this handy, you might want to give it a try. It is a pain to carry multiple fuel types, but at least it is cheaper than 5 or 10. If you have any head shims for it, you might want to pop them in.
Good luck, I understand your frustration,
Curtis