G'day....My mate gave me a beach cruiser which i stripped and have let rust a little. I have collected a number of small engines which i plan to put to use. I have 2 Villiers (different years) 98cc engines and i plan to use one on this bike. I plan to fit a 20 inch bicycle rim to the rear wheel via brackets and buy a pulley for the front and have a hand clutch (the vintage sort that puts tension on the belt). I entered the information into motorbicycling calculator and i think if i put about a 70mm diam pulley on the front i would get around 35mph which is what im after. My question though is how do i know if it will have enough torque at that gearin to be ridable?