Re: The best way to 40+mph
I'll have to agree with the folks who like a nice cruising speed of 20-25 MPH. I will probably always be fiddling with these because it's so much fun, but a bicycle just isn't built (yet) to go a sustained speed of 40 MPH comfortably and safely.
A real easy mod is to drill small holes in the plastic air filter cap. I also port & polish, (it's actually, a real easy Dremmel job, just don't get too enthusiastic with it!)