Based on a Suzuki GN250 engine. The twin ports, 2 v, single cylinder is a dead givaway, as is the distinctive 'vented' front sprocket cover. The frame is obviously a Suzuki GZ250 based.

About a million (maybe a few less) companies in China make GN125/250 type engines, and about a thousand make GZ type frames.

Sorry, exactly what were you asking?