First off, hi there guys and gals.... hopefully you can help me... I recently started working in a very diverse motorcycle shop... basically we fix just about everything there is on wheels... please don't hold that against me. I'm usually not bad at figuring out "how it works" but this one has me stumped. And so does the one sitting right next to it. V-star 650 classic's both. So here's the issue. Florida has very horrible fuel sometimes... and people let their bikes sit... so we get em. "It wont run"... so we do the deal... clean the tank, clean the fuel pump, clean the lines, completely dissassemble the carbs, clean every millimeter of surface, then put it all back together... usually no problems from there. No float adjustment needed, good clean running bikes... So this particular duo of V-stars... Both run very well at idle while on the sidestand... but choke and puke when upright... slightly better with the choke pulled, but still not running right. Backfires, misses, and generally non riding... Pulled, cleaned, and adjusted the carbs so many times I can do it in my sleep, and I'm down about 4 cans of carb cleaner. Even ran them in our nifty little ultrasonic cleaning box... jets as well. I've seen a lot of posts about carb issues here, and on other forums... but none that mention this particular wierdness.... hope y'all can help me out. Thanks much in advance!