It is a bill, that did not make it into law from my understanding. The moped fact sheet says that a moped licence plate is issued and that annual registrationn fee is $9. Here is a link to the fact sheet.
http://www.dmv.state.pa.us/pdotforms...ts/fs-momo.pdf. The correct way to go about registering a home built moped is this: Meet all of the requirements in subchapter J found here:
http://www.dmv.state.pa.us/pdotforms.../section_j.pdf. Then you need to go for an enhanced inspection at an enhanced inspection station.
http://www.dmv.state.pa.us/pdotforms...edstations.pdf. They will inspect your bike using the MV426B form here:
http://www.dmv.state.pa.us/pdotforms...ms/mv-426B.pdf. you need to include a detailed description of the specially constructed moped along with pictures with the form. PENNDOT will assign the VIN number along with a title. The VIN plate they give you will be put on your bike, obviously. The you can go to a notary and register it like you would a car. Mopeds are exempt from the annual inspection, but not the initial enhanced inspection. I recommend talking to yodabob or jbcruisin as the have gotten their bikes registered in pa.