So after months of mods including a special air filter, the SBP expansion chamber, a much smaller sprocket, new jug and piston, and a bunch of other stuff.... ...I clocked 47mph today! No lie! I have proof but am trying to figure out how to put it online... On a straight road, my bike cruises at 44mph easy, I found this out from a few different ways. -I reset the trip mode on my garmin nuvi gps so that way it'll tell you the max speed you had, and i stuck that in my pocket. -I had a friend drive behind me and watch his speed. -Lastly, I just got pulled over again and the officer told me I was going over 40mph! I'll put some videos up soon of my friend driving behind me, you'll see him holding the camera in his car filming me and his speedometer. I can take pics of the gps display but some people probably wont believe that. Anyway, i'm all excited because of the results I just got so I wanted to spread the word that you really can turn these little chinese engines into DIRT BIKES! THANK YOU ALL FOR THE FORUM, I WOULDN'T HAVE MADE IT THIS FAR WITHOUT YOU!