unknown frame fitting?

It's used as a bachok( not sure of the spelling). Basically a small taxi. The car next to it is attached for people to ride. This was in Sumatra. They were only in a few places but we probably saw a hundred or so. Not sure how old they were, but I'd never seen a BSA before.

That looks like a BSA B32. It's a 350cc single made from 1946-1957 and used primarily for competition. Pretty scarce bike and worth a few bucks. Ed

They were lined up along the streets waiting for customers. Every one looked the same. Now you know where they all went to.