Ive got a panda funrider. its basicly the exact same thing as a pit bull.
there are alot of good points about these little "motorized bicycles"
thats how the 50cc is listed on the MSO so there are benefits.
if you can stand the lack of power (the 70cc version is probably a bit better and it has electric start) and can drive it as you were driving a bicycle (30 mph all out tops). you can get 150+ mpg all day long. i put a lifan 138cc oil cooled (converted to air cooled) engine in mine bought off Ebay. now it gets an awefull 125 or so mpg. the engine transformed the little guy into a great town bike. i put an 18 tooth counter sprocket on the engine to be able to make some use of first gear (still way too low for the street but about right for deer trails). i bought a pipe for a mini mx and chopped it down so the muffler fits where the original was. the end is aimed at my right rear shock and since its still running a tad rich is making my rear fender black with soot. oh well. the lighting is tons better too since there is a more powerfull alternator on the 138.
it is a ton of fun. wheelies are eazy. no yanking on the bars. just click into second and snap the throttle open a bit. third gear too with a bit more throttle. the brakes are fair, a bit woody but im used to sportbikes so...cornering is awesome. the tires are very soft and grippy although i have gotten the rear to step out on a dirty corner. the cops rubberneck (well they used to) to look for a plate, which it has. i can drive this where 4x4 wheelers cant fit and i can get there legaly on any road. i plan on studing out a set of tires so i can take it ice fishing too. it would be great for getting to a tree stand too. not as obvious as a four wheeler on narrow trails. if you want to save a bit on gas and live just a few miles form work id recomend this setup. i have around $1200 into it. if you buy a pit bull, engine, pipe, aircleaner, clutch cable and clutch lever at the same time a dealer should cut you a deal. the wiring is a simple 6 wire. three colored wires match right off and the other three can be figured out just by taking off the left engine cover. I tossed the battery from mine too. less to replace and works fine without one. if you figure in $3 to possibly $4 a gallon gas in the not so distant future the bike would pay for its self pretty quick. especially if you drive a vehicle that gets under 25mpg. do the math. no. really. do the math.
PS if your of the large of size- lifan sells a trail 110 that is a copy of the honda trail 70/90. it is a bit taller and more room.