MasterSmasher, (or anyone else), I was just going to ask a similar question, specifically about an OS 46FX. I was breaking it in yesterday, opened the needle valve 2 turns to start, I was leaning it out until I got a nice clean whine, and occasionally backing up a bit, sort of a 'two steps forward, one step back" approach. I ran it the last few minutes at a real clean whine, with white smoke still coming out the muffler, but when I got done, I realized I now only had the needle valve open 1/2 turn!!
Is it likely I screwed something up? It sure sounded nice, and there was no sign anything was wrong.....
Also, what to do next? Would it help to rerun it richer, or is it too late, just continue following OS's directions re. the first few flights?

Thanks!!