For those of you who have TGB mopeds and live in Virginia, you should know that as of July 1, 2008 the State Assembly changed the moped definition from a max of 30 MPH to a max of 35 MPH. All other rules are the same (50 cc max displacement, etc.).
In theory, that means you could tweak a 30 MPH moped to run at 35 MPH (also, keep in mind that speedos are likely to overstate true speed -- on my R50X the 37 MPH top speed reading is really 31 MPH -- so don't go by the display). However, there is a thread in another section of the Forum in which TGB's Bill Peirce warns that running the engine at constant high revs over 30 MPH can accelerate engine wear.
Rod