Re: 2 stroke motorized bicycle top speed
It seems almost everyone here is posting speeds which they got after modifications.. which isn't what the post asked for..
i just finished my first bike.. 66cc engine with 50T sprocket. everything stock (except the large sprocket for fitting over coaster brake)
just rode it for the first time today on nearly flat tires and got around 25mph.. also didn't hold full throttle for very long so it'll go quicker. tends to misfire right now so speed should improve over time.
anyway, 25mph is fine for me with my crappy brakes. torque and acceleration is obviously very good with 50-tooth. i can start off from a standstill barely touching the pedals.