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There is another possibility, BD250 model is also used by another manufacturer call: Baodiao, which is a very small company.
But one thing that I can be sure is enigne code 165FMM-P is from...

I found this topic accidently, so I did some search for you.
If the model is BD250, then bike made by one China brand called :Benda. quite popular recently cause it release some 300CC crusier bikes....