I have 2 Homelite engines, one from a weed wacker and the other from a leaf blower, but I just cant figure this out. Say I make a friction drive bike, when the bike is at a stop, wont the engine keep turning? I would prefer to somehow mount some kind of sprocket and run a chain assembly, can someone please put up some pictures of home-made engines? Or give me some info on how to mount a freewheel of some sort? Sorry if I am dumb.