Re: 43mph 48cc stock internals +- 1500 miles later
My speedo is on par with my GPS . On the flats i can cruise at a comfy 25 with my old pipe (not standard pipe) . The estimates I worked out was on the engine revolutions. Roughly 8 revs per 3.28 foot (1m). I might be wrong on my calculations . For eg. 10 000 meters divided by 60 mins multiplied by the number of revs (8) . note that I got 8 revs using a 26" wheel and 36T sprocket. Thus at my maximum (downhill) of 43mph (70kmh) works out to 9333rpm. I weigh in at 176pounds (80kilos) and my bike weighs 61pounds(28kilos).
Last edited by Ahmedy; 11-12-2015 at 11:29 AM.