Update: The one received has the wrong thread size. It seems that the item I received is a 10mm x 1mm thread, where I would need a 12mm x 1mm thread.
I did find an NOS, but at 50 Euro for the petcock, this is out of my league, and I can't afford that luxury, so I am back in the hunt!
If you have a Zanetti C50, I would like to know you and your bike - it was produced in such small quantities, it would be great to know where the bikes are today. Send me an email at zanettic50@gmail.com with some details, the engine number and some pictures!
The petcock or fuel line tap is broken on my Bicizeta - From taking it out and comparing with some of the pictures I could find on the web and pictures that were sent to me, it seems original but broken where the line comes out to the carburetor:
The picture is not really good, but as the gas tank has a line coming out, there is also a nut connecting both items with reverse screws.
It appears to be an OMG brand although mine does not have any casting on it. Send me pics of yours at zanettic50@gmail.com
I am looking for a replacement and a french website selling old motorcycle parts (http://www.macadam2roues.fr) seems to be carrying some similar, like this one:
