Re: Tensioner Redux
Your frame appears to be of the same type that is shown in the pics below. i.e. a typical coaster brake beach cruiser type frame with long drop-out slots.
Naturally these long slots were not designed into the frame so that we could mount an engine and keep our drive chain at the correct tension, but why not take advantage of it?
Simply put your kit tensioner on the pedal side...or rig up a spring loaded tensioner like is shown in the pic.