I'm in p200 hell right now! Did a quick rebuild last year for Joey in Corvallis. You know how it's a balancing act of what all is replaced. Well, it kept dying at idle. Got some help from @English Dave and confirmed that the fly bearing was bad and definitely part of the problem.

Replace the bearing and seal, and then similar issue. So I swapped a different carb on there, only had a 20/20 but drastic difference and it started idling. Tried the 24/24 again and it just wouldn't idle.

So now I'm basically jetting the 20/20 and it's kinda right but not perfect. The 24/24 was stock jetting 160/be 3/116 and 55/160. The 20/20 ran fine with the 160/be 3/116 but was smokey and idle was finicky. So I've gone to a 45/120 idle, which is the happiest of what I have. 38/120 didn't quite work and 50/140 was equally not as happy.

For the main I'm down to 140/be 3/107 and it's much more normal smoke. I've got mostly a decent idle but it occasionally surges and other times dies (I can open the throttle and stop it from dying).

Who's got ideas? Looking at you @Scott Gamron and any other fresh ideas.