mykill, to avoid some confusion I should clarify that I have just done everything you just suggested, save for flushing the tank and changing the lines, to no effect as explained in the OP. I did clean and inspect the carbs when I first got the bike, and now I will be ordering new jets and needles, possibly floats.
Also, I should be clear that the stumbling seemed to occur for just one engine cycle most of the time. It was more of a very momentary loss of power than a prolonged sputter, leading me to think that it's not the fuel delivery, but I'll be careful not to rule it out.
EDIT: Just weighed the floats, one was 12.9g, the other 13.0g. I made sure they were dry by leaving them in the sun for about 30 minutes. The previous owner replaced them at some unknown point, and the weights match the listing of similar bing carbs exactly. I'm thinking I might not replace them.
senatorperkins screwed with this post 08-23-2012 at 02:22 PM