Getting this 14mm carb upgrade was a good opportunity to make a nice laid back rebuild video. My other carb video is much more basic and exploratory, it shows a carb cleaning
http://www.youtube.com/watch?v=_tSK38qR8Ik
Check out the service manual for the Puch Maxi at the bottom of this page, it's helpful if you have one printed out you can reference, again page 58 for the carb essay:
http://www.mopedarmy.com/wiki/Puch_Maxi
And my starting point was this wiki article, I thought that if people can see exactly what to do rather than just reading about it things will be much easier:
http://www.mopedarmy.com/wiki/Fix_a_leaky_Bing