I somewhat agree with Max. I have the 18T sprocket (42 rear) and missed a little oomph when riding two up. I decided to go with the BB904 and that wanting more when riding two up has gone completely. I can't really tell any difference now, solo or two up. I love having what I need in a classic air cooled 2 cylinder.
Right now, I feel it's the best of two worlds. A sport like bike that cruises well and looks like a classic to boot!
