Ok an update on my mystery kart. In my town where I live there is a racing go kart shop named Fairfield motorsports. I took the frame up to them and asked a younger employee if he could Identify the frame. He had no clue so they brought out the old man with so much knowledge it's scary. He said...
Here are some more pics. From center of rear to center of lower frame is 68 1/4 - from center of rear to center of bumper guard is 70 1/4. Hope these pics help.