Joined: Jun 2014
Posts: 4,628
Likes: 943
From: Ontario, Canada
Bikes: iele Latina, Miele Suprema, Miele Uno LS, Miele Miele Beta, MMTB, Bianchi Model Unknown, Fiori Venezia, Fiori Napoli, VeloSport Adamas AX
That you're using an old chain on a new sprocket is most likely the problem. Also, your chain looks to be a bit loose.
Why doesn't the sprocket engage when you pedal forward?
Cheers