Ay, leave us older, easy cruising, trailer pulling, don't want to mess with mixing guys enjoy our four strokers!& I don't care what the 4-stroke guys say... Pound per pound & dollar per dollar, you'll get the most bang for your buck from a 2-stroke.
The answer is yes, a good running China Girl will do about 40 mph top speed with a 36T sprocket, but cruising speed will probably be about 35 mph. If you plan to go that fast, a lot, you better have a good quality bicycle, with good brakes.Have a nice trek mtb for china girl or electric dd hub motor. I wanna do ebike, but I don't want 8 mile range and 35 topend... An batteries that could burn down my house.. Ideas? Can a 80cc motor get up to 40 with mods?