I claim the ornamental design for a motor support sock, as shown and described.
FIG. 1 is a perspective view of a motor support sock, showing my new design;
FIG. 2 is an exploded perspective view of the invention;
FIG. 3 is a front elevational view of the invention;
FIG. 4 is a rear elevational view of the invention;
FIG. 5 is a right-side elevational view of the invention, the left-side elevational view being a mirror image thereof; and,
FIG. 6 is a top plan view of the invention, the bottom plan view being a mirror image thereof.
The broken line showing of a boat and engine and a motor support rod is included for the purpose of illustrating environmental structure and forms no part of the claimed design.