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.
Long ago when men cursed and beat the ground with sticks it was called witchcraft, nowadays it's called golf.