Well Im a Newbie when it comes to Motorized Bicycles. used to motorcycles. Im wanting a good reliable engine to run in a Beach cruiser style frame. Would like suggestions on what i should get. and do to make it run nice. I will be only Riding it to and from work. most of the road is Flat. then down hill then back to flat to work. After work at between 2am and 4am will be flat then uphill for a small incline then mainly flat. Would like to be able to get bout 40-45mph . 35mph is on some of our roads here. but still would like to get atleast 40. really want reliability so mainly looking for a 4 stroke.