The other thing I thought of: did you try switching the petcock to "res"? My buddies bike was acting like this. It would go 2 miles, then die like it ran out of gas. Turns out that he just barely had enough gas that when the bike was on the sidestand, the carbs would fill, but when upright, there wasn't enough gas to fuel the engine when on "on" setting. aka, we could start it, and it was fine, but then when we test road it around the neighborhood, 2 minutes later, it would die.
Anyhow, just humor us and try switching the petcock to "res" and see if it runs better.
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