Changed the rear end.
I was having lots of trouble keeping the chain on when I hit a bump even with a tensioner. I saw an earlier post of the same bike without the reared. So I removed it, cut and welded the axel hangers to the frame. This short end the chain nearly 14 inches. Now the chain stays on

I will be welding triangle plates to brace the axel hangers soon ( wanted to see if it worked first). Now it even looks more like a classic mini bike.