The ornamental design for a wall mounted retractable motorcycle cover, as shown and described.
FIG. 1 is a perspective of the wall mounted retractable motorcycle cover of the present invention showing my new design with the cover being depicted in a stowed configuration and the phantom lines depicting solely environmental structure and forming no part of the claimed design;
FIG. 2 is a front perspective view thereof with the cover being disposed in a partially extended configuration and the phantom lines depicting solely environmental structure and forming no part of the claimed design; and,
FIG. 3 is a front perspective view thereof illustrating the cover in a fully extended configuration.