Bassman, what I found with mine was the motor had to be level to start good. If it was trimmed up even just a little it was hard to start. I was told it had something to do with the float system but don't know that for sure. I know that once I found this out my Merc would fire right up every time usually without even choking it. Hope this helps.
Everything is funny, as long as it's happening to somebody else.