Abstract: A boat motor conversion apparatus for converting a line trimmer into a boat motor comprising a tube having an upper end and a lower end, the upper end adapted to be coupled to a line trimmer's motor housing; an elongated drive shaft disposed within the tube, the drive shaft having a tip end extending from the upper end of the tube and a base end extending from the lower end of the tube, the tip end adapted to be coupled to a line trimmer's drive motor, whereby the drive motor rotates the drive shaft within the tube when activated; a boat motor having a plurality of gears coupled to the base end of the drive shaft for redirecting rotational movement therefrom and a propeller coupled to the gears; and a securement mechanism coupled to the tube and adapted for securing the tube to the stern of a boat.