Honda probably never intended for this to be a "scooter," but the state laws in VA allowed it in (under 50cc, less than 35 mph, etc) although I got pulled over about every 3rd or 4th time I left the neighborhood.
I rode it 3.5 miles each way to and from school for 2 years at Va Tech. It's a 1997 model Z50R with CT70 cylinder, overbored 1mm (largest factory piston I could find). I modified the piston to clear the valves on the stock 50cc head which gave it a static compression of about 13:1. The pipe is just that- a piece of 3/4" EMT conduit with a 10hp lawnmower muffler welded on.
The bars are chopped right below the cross brace and a set of titanium mountainbike bar ends were installed as clip-ons. The tires are Bridgestone Hoop-D scooter tires, 3.5" x 8." The front end has been lowered 1"
Finally, it's recorded top speed (Garmin GPS) with me on it is 51 mph, recorded and backed up on Simpson Road in Christiansburg, VA in 2002.