Most carb "problems" are probably caused by vacuum leaks. Syncing carbs is just a maintenance procedure; takes about 45 minutes max and most of that time is setup and buttoning up afterward.
Vacuum leaks wouldn't be a problem, but syncing and rebuilding carbs is something I'm not familiar with and there is no one in my area that is knowledgable with Valkyries. Even a guy at the Honda shop didn't seem to know what a Valkyrie was!!
