Hi I live in sc and am getting into this whole thing. I've looked everywhere to find a better way to build my motorized bike and have determined the Chinese engines to make the most sense all the way around what I'm wondering is how much more speed could I get out of one of these on a 26 inch bike if I used a substantially smaller rear sprocket. I realize I'd have to pedal start it all the time and pedal much longer but I don't mind much.