Here are the videos for how to assemble/adjust and repair these Chinese roadster bikes. Again, it is in Chinese but the videos might be helpful. There is a 10 second ad at the beginning.

Also, they can fix anything with almost nothing.

The one that might interest people is the one containing the full chain case and rod brakes:
(starting at 5:00)
http://v.youku.com/v_show/id_XODI0ND....html?f=646289


All videos:
http://www.youku.com/playlist_show/id_646289.html