Well it appears that I may have jinxed myself!!!
I haven't had much of a chance to get out and mess with the carbs, so today I had some free time and figured I'd get it purring. For some unknown reason it will not idle now. I can get it to start, but if I let off the throttle it dies. I adjusted the throttle cable to within spec and synced the carbs but it will not idle!
I am perplexed.