Diesel Scooter?

First off i'm wondering if anyone sells a diesel scooter in America. Second, i would rather create my own, the type of body style i would like i can't think of what to call it to search or find pictures. Buts its the exposed frame kind, usually black with big wheels, something that would probably come in as a kit. I saw someone go by my house on one one time but haven't see any since then. Thanks

Something that be able to go the distance and be road legal

here's a link to them on ebay.

I want one, too! But first I am still seeking a New Beetle convertible TDI (diesel)...rarer than hen's teeth.

Your best bet would be a "mini bike" frame.
Do a web search for "briggs and stratten mini bike" to see what they look like.

A small diesel engine would probably not meet current US EPA emissions requirements. China 49cc 4-stroke gas engines (139QMB) have been very reliable.
http://www.evosales.com/pd_iscooter.cfm

Might find a good used value on your regional craigslist > for sale > motorcycles.

The type of scooter that you may be thinking of were made by Cushman (search for Cushman scooters). Check into the Briggs & Stratton engine site, they have a line of diesel engines. Unfortunately, Cushman scooters are antigues, but, maybe you can find a junk one and use the frame.