VBB1 Engine Rebuild Help

Hello, I’m a vespa enthusiast from Argentina. I’m started a rebuild a 1961 Vbb1T, here are some pictures of the engine:

https://www.dropbox.com/sh/sijm706tpv6xsew/RuTVcdYp95?n=93689980

Now I’m trying to rebuild the engine, but I have some doubts about the kick starter gear:

https://www.dropbox.com/s/hev5kjp7a97oroa/20140407_224429.jpg?n=93689980

 

I move the gear wheel in the rotation way, like the engine is turning on, and the starter gear  make a noise like track track track track. I see the worshop manual and the assembly seems  ok, but I don’t know if the engine works properly and I don wam to to make the finally assembly with the doubt if everything is OK.

 

There is a video whit the noise:

https://www.dropbox.com/s/eb9imf4zfqtpvdm/20140409_004245.mp4?n=93689980

 

Thanks a lot!