It's not a stupid question at all, just that the answers are a little vague.
It probably belongs in the Legal forum too and will likely be moved there.
I think you meant to say
does have an automatic transmission.
From Mass RMV site:
According to Massachusetts law, a moped is a "motorized bicycle." In order to be classified as a moped, the vehicle must:
* Have a cylinder capacity of no more than 50 cubic centimeters.
* Have an automatic transmission.
* Be capable of a maximum speed of no more than 30 miles per hour.
* Comply with all applicable federal motor vehicle safety standards.
http://www.mass.gov/rmv/license/7moped.htm
The bikes I now own, which are rack mounts, have a single speed centrifugal clutch which qualifies as an automatic.
The so-called happy time kits, the 2 stroke engines that originate in China for the most part have a hand clutch, though you can get them with a centrifugal. This is a bit of a gray area. Essentially they are single speed when the drive train runs to a sprocket on the left.
Some states articulate in their regs something like "shall not cause the operator to shift gears", etc, etc. Mass does not, just "automatic".
The add on assemblies that jack-shaft the engine drive train to run to the right side or engine mount assemblies that cause power to run through the bikes gear train are another gray area. I'm not knocking them because they can make a lot of sense and others might have various opinions on this but mine is in essence you are shifting gears manually and outside the letter of the law if stated that the bike must be an automatic.
Lastly it should be said, this is one of those questions that sometimes the more you ask the RMV the more hassle you stir up for yourself. Keep it under 50cc, under 30mph, keep the noise down, wear a helmet and ride responsibly.