I am 15, and this is a picture of the minibie I've been building for the last 4 mounths. It has an entirely scratch built frame and uses a 2.5hp cylinder mower engine, and two 10 inch pnuematic wheels. It has a 45 tooth sprocket on the back and will have a 10 tooth clutch up front. It is live axle and uses a 41 size chain. Although no brakes, I am trying to design some for it.