I build good quality gas powered motorized bicycles and sell them for less because I have a very low overhead and I do it because I like it. It beats sitting and watching the bad news on T.V. all day and keeps me away from my wife.
I use only new bicycle and new good quality engines and hardware on my motorized bicycles. I do not drill a hole to weaken the frame for the front motor mount. I use a good u-clamp type mount; it holds the front of the motor in place, which is important for a trouble free ride. I use both 2 & 4 stroke engines. The 2-stroke 48cc is the most popular because it costs less than a 4-stroke and needs low maintenance and it is just as dependable and works about the same.
Motor assisted bikes of 50cc and under are legal to ride wherever a human powered bike is allowed except for on the city bus, no insurance, license, or registration is required. The legal speed is 20 mph, but it will do 30+ mph easy. They also get 100+ miles per gallon of gas; speeds and mileage depends all upon the weight of the rider and bike, it costs only pennies a mile to own and operate! Faster than walking, faster and cheaper than taking the bus and more fun!
I will also build a motorized bicycle custom for you or I will help you build your own! It's a great hobby!