Dar is totally "right on", I know because I have a 45, a 40 and a 28 MVVS . I actually aquired the 28 from Dar. I had some tuning problems with the 40 and 45 as they both were equipped with the old carb. He helped me with the new Needle setup and I now have two really impressive engines, the 28 has the new carb so is really excellent out of the box.