I want to build a motorized bike for going to and from college, it's 7 miles and I'd like to go at least 40mph if possible. I'd like it to be as cheap and light as possible. If anyone has a list of bikes that fit engine kits really well, that's much appreciated. If anyone can recommend a good and cheap engine kit, that's also appreciated. This won't be my first motorized bike, but it will be my first budgeted one.