Sounds pretty normal to me for a 97 Valkyrie...My 99 did similar things on occasion and I put a 1/2 bottle of Seafoam in tank a couple of fill-ups and the thing ran fine until I traded it a couple years later.....Not discounting other things may be wrong, but my son-in-law in Oklahoma rides a 99 Valk which has 28,000 miles on it and he is now having carb issues and the dealer has also quoted him a pretty steep price to re-build/calibrate the carbs...I suppose that is why most bikes today have FI which seems to be much less hassles......