A mechanical assembly for supporting and positioning an outboard motor (44) in two primary positions. The first position is on deck (40) near the transom, a relatively safe position for attaching or removing an outboard motor while at sea. The second position is on the transom (42), in a marine propulsion operational position, with the propeller in the water. In the preferred embodiment of the positioner an outboard motor (44) is mounted to a mounting board (30) that is part of a car assembly (20) that slides in a captivated track adapted for mounting to the deck (40) and the transom (42). The track is a single continuous track from deck to transom facilitating positioning of the outboard motor in either of the two primary positions. In the alternate embodiment of the positioner the outboard motor can be positioned between the same two positions, on deck (40) and on the transom (42). The mechanism for spatial positioning using the alternate embodiment is a five-section series hinge. The two end sections (52) and (60) are adapted for mounting to the deck (40) and the transom (42) respectively. The middle section of hinge (56) has a bracket (72) and mounting board (30) incorporated to provide mounting for the outboard motor (44). The middle (56), and two adjacent sections (54) and (58) of hinge, facilitate controlled positioning of the outboard motor between the two primary positions. In both the preferred and alternate embodiments of this outboard motor positioner, the outboard motor (44) can be easily moved in a controlled manner to either position.