I know that in San Antonio, and Texas in General, as long as you can still pedal independently (to get the engine going) it still classifies as a bicycle. The minute you remove that feature it becomes a motorcycle. Windcrest may have city ordinances that are different from San Antonio. I found a great builder here in San Antonio that did our first build and as soon as we have the funds, we are going to have him do a 2nd build for us. Our first engine is a 2 stroke gas oil mix, but our next one is going to be a 4 cylinder straight gas. I am going to be on the road to much to remember to mix oil and gas for each tank of fuel.