Nice to have you aboard, Bob. I think that you will get an answer to your problem. I seem to remember the same circumstances from another fórum member. Hang in there, you are going to love your ride when it gets done.
Oh, it's not my ride. It's a customer's bike. Probably about the 50th bike I've worked on this year, but the first that I've left not running perfectly. I knew I needed to research and reflect a bit rather than waste billable hours chasing my tail.
My current theory is inadequate venting causing the float bowls to be reluctant to give up their liquid contents to the main jets. I'm going to test this by artificially venting the bowls differently. Won't even need to ride it. If I loosen the float bowl screws just a little and hit the throttle and get ANY improvement, I'll be satisfied venting is the issue and I'll take pictures and really document the cause and solution, since I have yet to see something like that presented anywhere.
I've seen venting presented as one of a number of possible causes. But the symptoms I've seen described are consistent with mine so my guess is that if its ventilation on the one I'm working on, it'll be ventilation with most of them.
My own ride is a CB550, but I won't go off-topic to say much about it here. It'll eventually get a ton of space in my blog, though, as it's easily on my top 10 list of bikes I wished I owned and am glad I do/did.
I've quite enjoyed my short test rides on this particular V-Star, though. It's an 03 650 Classic. Kinda fun to ride, though I'll never get used to forward-mounted foot controls or the disconcerting tendency to resist turning, initially, then to fall rather abruptly into the turn, wanting correction. I'm not accustomed to this much rake, and the way it seems to remove counter-steering as a correct way to do things if the turn is very sharp.
But once rolling (as "rolling" as I could get it seemingly on just the pilot jets), it's very nice and comfy.
Anyway, that's my intro. Love motorcycles at the "sickness" level, and pretty experienced at wrenching on them and hope to make some contributions to the body of knowledge contained here.