I switched from stockers to PWK 28's over the winter, I've went on a couple small rides since, I can't believe the difference they made. My junk is your basic "bolt on" machine, ported stock cylinders, Pro Circuits, VF3's, UNI pod's. Yeah the stock carbs worked ok, I thought they were decent until I put these PWK's on. Throttle response is night and day difference.