Looks like us Massholes have to have plates now... and renewal has changed too. Still 2 years but renewal is in March now. I have to get ruddy plate mounts for my bikes. Arrrgh. Still no insurance for under 50cc and 30mph or less. But still. Plates. Sigh. Link below to mass.gov .
https://www.mass.gov/how-to/apply-for-a-moped-registration (edited)