Mikuni's work great when jetted correct. The victory book will get them so they are safe, you know, not to lean or fat. However, this is just a baseline. You'll need to find yourself a shop that deals in mikuni parts. Thus you'll have to take an afternoon to plan your jetting. Remember all parts you buy are yours for the keeping, do plan to spend a few bucks. Just because its in the victory book doesn't mean it will be perfect, you will have to jet it. I have a BSA that I built to mimic one I did a few years back and set the carbs up exactly the same, what do you know, had to jet them differently. Seems like there is always a variance. P.S. if you do not know how, learn how to read spark plugs.