I don't know for sure, but I believe the burner is a moped frame you can buy to use with Honda c50 parts. But whatever it is, it's very well done, and very cool.
It’s none of the above, he has built the whole thing from scratch himself.
The frame is hand built from tube, with the fuel tank in the tubes. The wheels are from a Tomas moped & he did it as they are same size as a bmx but are obviously cast alloy & stronger.
He works for an engineering company close to me