Outboard motor mounting system

A boat transom mounting plate arrangement for removably supporting an outboard motor having a pair of U-shaped clamps which each have one arm with an adjustable clamping screw and a second substantially straight arm spaced therefrom comprising a first mounting plate secured on the rear side of said transom and having an upper edge substantially flush with the upper edge of said transom, said first plate being formed with a pair of spaced apart vertical grooves extending downwardly from the upper edge of said plate a second plate means mounted on the front side of said transom, said second plate means having an upper edge flush with the upper edge of said transom and defining a pair of recessed areas, said first plate grooves having widths substantially equal to the widths of said flat clamp arms for receiving and guiding said arms into precise lateral position on said transom so that said clamping screws are laterally aligned with said recesses and may be screwed into said recesses whereby said first plate vertical grooves and said second plate means recesses positively retain said motor in predetermined position.