Mo. Rev. Stat. § 306.530: Registration of outboard motors.

1. The owner of an outboard motor kept within this state shall cause it to be registered in the office of the director of revenue who shall issue a certificate of title for the same.

2. The owner of any outboard motor acquired or brought into the state shall file his application for registration and pay the fee within sixty days after it is acquired or brought into this state. The director of revenue may grant extensions of time for registration to any person in deserving cases.

3. Any make of outboard motor older than 1960 which is owned solely as a collector's item and which is used and intended to be used for exhibition and educational purposes only and will not be used on the waterways of this state will be exempt from titling and registration pursuant to this chapter.