I think the hesitation is coming from idle screws possibly... At least that's what I've been guessing at this point... Two tired has a little test involving putting the bike in top gear while running and putting it at a idle speed and opening the throttle half way... It should, as he says, have slow smooth acceleration but it in fact hesitates and burbles.... Almost chugging sound
Nope. Idle screws and idle jets control idle.
As soon as you turn the throttle it is the slide needle that comes into play.
+1
I'd add that if your timing is correct (set at the || marks at say 4000 rpms at full advance - let it sit where it will at idle, around "F" somewhere), and that your float levels are ok and clip position is not at either extreme, go for a test ride and note your mixture screws.
Sounds like your mixture screws are set a bit lean.
Try at base position, say 1 turn out. Go for a test ride and make some notes to see how it feels and whether the hesitation has gone. If the hesitation is still there, try coming out another 1/8 turn to enrichen. Keep going until the hesitation has gone and make not of how it feels on each run.
If the hesitation had gone at 1 turn out, try coming in to say 7/8 turn, then 3/4 (leaning). Again make notes and find the sweet spot of where it grabs nicely.
I just did this on my bike. For me, 1 turn out felt fat/rich, 3/4 gave the same symptoms as you described with hesitation when coming onto the needle, 7/8 turn out was optimal for mine and feels good.
