I know there are several people on here who are experts on these karts. Can someone tell me about this one? The decal reads DART KART A-Bone. It also says RobRon on the decal. It has original Rupp wheels on it. The rear sports a seat back tank, and the engine mount is the same as Rupps. When where these built? Also would like to know the story behind the RobRon and Rupp deal. I suspect that this was made late, twords the end of the rear engine kart, but would like tyo nail it down.