I am going to hook up my offroad scooter to a 48cc ww motor but I have a quick question about gear ratios... I am still a little confused about it all. People have told me that I need a ratio of 18.75:1. Is that right? I am guessing i need a jackshaft. The thing is, if i use too high a ratio, it will not reach the speeds that I intend it too but if I could go too low, then i risk burning the clutch. I am running 16"x2" tyres so that if probebly my problem. I have come to the obvious conclusion that bigger wheels means faster speeds but with my frame, there is no way of getting these sizes unless i mod the frame, which i dont really intend to do unless necesarry. What other options do I have?