Some info for you guys. I read it all and registered my boat as a result. You need to look into this if you wanna be %100 legal.
Am I required to register my boat?
State law requires the registration of any boat that is powered by a motor and operated on public waterways in Massachusetts. Registration is required even if the motor is not the primary means of propulsion for that boat. Some examples of boats that require registration include fishing boats with motors, recreational motorboats, canoes or sailboats that use motors (includes electric motors), and personal watercraft such as Jet Skis or wet bikes. Boats exempt from registration requirements include those that do not use motors, and documented vessels (large boats that are issued a marine document and registration through the U.S. Coast Guard). Vessels used solely by a city, county, state, or federal agency will be issued a certificate of registration and number at no charge.
Do I need to apply for a certificate of title?
All boats 14 feet or greater in length that are designed for use with a motor, or that use a motor at any time, must be titled. For example, sailboats 14 feet or longer with a backup motor in use, or sailboats designed for use with a backup motor, must be titled. Even canoes 14 feet or longer that use a motor of any type must be titled. Boats exempt from titling requirements include U.S. government-owned vessels; federally documented vessels; boats used solely for demonstration, testing, sales, or promotional purposes by a dealer or manufacturer; and boats registered in another state which are not located in the Commonwealth for more than 60 consecutive days.
http://www.mass.gov/dfwele/dle/boatregfaq.htm#Require
Good luck!