The reason it does it when your “chillin” – riding with the needle in the main jet is that your running lean down there.
1. fix the air leak im telling you right now you most certainly have.
2. Put a Delorto 19.,5 on that thing with a malossi intake and it will wake the dead. And you will be able to adjust the idle jet ( which doesent just do idle )
3. Fix the air leak and calibrate it to your bing, but it was really meant to breathe…....
you keep running it hot and lean , your gonna blow itup