Not sure if this fits here or not. My dad and I have been riding our motorcycles together for many years now. The other day he told me that he wants to put a motor on his bicycle and take some longer trips on it. His bicycle is set up for touring and he has a bob-trailer for camping gear (single wheel trailer). Since he talked to me about it, I've been reading up on motorizing bicycles, watching videos and reading up on others touring adventures. I think I am hooked! I LOVE taking long trips with my motorcycle (did a 4000 mile trip last summer), and the thought of taking a cross country trip on a bicycle with a 49cc engine pushing me along at 25-30 m.p.h. has really got me excited for some reason. The plans for now are to build up two motorized bicycles in the next couple of months and go on some shorter ~800 mile trips, then later year take off for a cross country trip. We are planning on using Honda GX50 4 stroke engines and shift kits (lets you use the bikes rear casset or internal shift hub. They get between 150-200 miles per gallon and a usual day consists of ~200 miles of riding. It is a slow pace adventure, but I'm sure it would be a whole lot of fun. Has anyone tried out any of these motorized bicycles? This is similar to what we are looking to put together (but on mountain bike frames) and pulling a single wheel bob trailer for camping gear and photography/video equipment.