Surprisingly, it’s fairly difficult to find state inspection requirements for motorcycles. Specifically, I wanted to know if I needed turn signals. I found, via the MA DOT site, this pdf that gives complete requirements.
So yeah, no. For my 1971 Yammy, no turn signals required.
In General. All lighting devices and reflectors required by applicable Federal Motor
Vehicle Safety Standards when the particular motorcycle was originally manufactured and such
devices required by Massachusetts General Law or Rules and Regulations applicable to the
particular motorcycle inspected shall be securely attached to the vehicle and capable of performing
their design functions.
Turn Signals. Each motorcycle manufactured on or after January 1, 1973 shall be
equipped with front and rear turn signal lamps.
Also, it reminded me I need a horn. Forgot about that…