A title is not necessary in New York. You _do_ need to register it. All the information and forms that you will need are on this page:
<http://www.nydmv.state.ny.us/dmvfaqs.htm#MOPEDS> I have registered several mopeds in NY and would be happy to answer any questions that anyone might have about the process. One key thing in NY. The moped that you are registering must be on their DMV certified list. There is no way to view the list. You must call the Technical Services Bureau at the number that is on that page I've linked and ask them if your particular make, year and model is on their list.
Andy, you'd be doing yourself a big favor by buying a ped from MopedLar as, in my opinion, he's a great guy who really cares about the moped community.