Re: what did you do to your motor bike today? I switched out from 44 to a 40 tooth, and now ride at around 25-30mph. I added a analog speedo, and now I have a weird whine, and am about to upgrade my airfilter and position from out behind the bicycle. I am stripping a silencer to build a baffle for a bannana pipe that has no baffle, and will be complete. The airfilter and pipe will be finished this weekend!