[Voyager]

I'd be trying a non-ethanol blend for a while and see if it helps. I ran 95 Ron with 10% ethanol for a few years, and had a hesitation on opening the throttle, particularly from standstill at the lights.
Eventually sucked it up and started paying more for straight 95 Ron petrol (super unleaded) and the hesitation disappeared completely.
Worth it for the extra $1-$2 a week.

I have the sam problem with my LT, hesitation when starting out, particularly once the bike is warmed up. When cold it isn't noticeable, but one warm it hesitates and sags below 2,000 RPM. I believe the issue is ethanol related also, but can't find any real gas around here to buy anymore.

 

[Voyager]

I've got it! I never asked if this was done. No doubt the 02 sensor was PART of the problem, but not the whole problem.
Take the topcase off, remove the black cover, and remove the YELLOW CAT CODE PLUG. The hesitation is caused by the motronic alternate fuel map. That will fix it. It takes 15 minutes. If you don't have the YELLOW CAT CODE PLUG, then look up "Cut the brown wire" under search.
That should do it!

Never heard of this plug before. I searched the forum and didn't see much either. Do you have a picture of what this looks like and where it is located?

Did some more searching (omitted "code" to get fewer erroneous hits) and found the information. It appears this applies to older LTs, the brown wire to middle-aged LTs and the air box temp sensor is the only option for my 2007. Is this correct?

The "sag" during start-outs in warm weather is really annoying!