what's the fastest out there?

how fast mine only go 40+

that's pretty much the top speed these bicycle motor kits are designed to do. With the right tuning, expansion chambers, shaving off weight, and different sized rear sprockets, you can squeeze out another couple miles per hour.
 
Al.Fisherman,
I have 3 MB's & the fastest one is also the heaviest one (DH MTB full suspension). It can hit 55 mph with me in an aero position (aka-lowracer) & is as stable & refined as a small motorcycle. My lightest MB has no suspension at all, but the same engine & could probably do the same speed, however I'm not crazy enough to risk it on that bike since it doesn't feel safe at high speed.
-Lowracer-
 
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