Tom is correct (as usual
). My bog showed up more during light throttle opening at low speed cruise. Using a huge squirter helped the problem but jumping 6 jet sizes was the fix.
I think the stumbles that do involve jetting are ones that you can continue indefinitely with light throttle - the period of time when the accelerator pump stops pumping and before the secondaries are open - or lean cruising.
My initial jetting was 68/76. I found that if I held the throttle 1/4 of the way it would hesitate/pop/stumble indefinitely. Had nothing to do with idle mixture, accel pump, ect. Im at 76/82 now - I feel it might be a tiny bit rich but wont know without Wideband.
So if its a brief hesitation, prolly accel pump adjustment. If you do it indefinitely, like when trying to climb a hill without downshifting, most likely youre too lean and need some jetting (assuming pressure, idle mixture, accel pump, ect is in tune).