See pic below. I have a big cam and very little vacuum at idle, so I needed to open up the butterflies on my Demon 750 using the idle position screws just to get it to idle. But then that introduced a stumble/bog. So I had to then install larger idle air bleeds to further emulsify the idle mixture. That in turn allowed me to crack open the butterflies/transition slots a bit more to get it to idle (without stumbling.) I know, clear as mud.
