I claim the ornamental design for a motorcycle seat trough, as shown and described.
FIG. 1 is a perspective view of a motorcycle seat trough, showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a perspective cut-away view thereof;
FIG. 4 is a cross-sectional view thereof, taken generally along lines 4—4 of FIG. 2; and,
FIG. 5 is a cross-sectional view thereof, taken generally along lines 5—5 of FIG. 2.
The broken lines showing a motorcycle and portions of a motorcycle seat in the figures are included for the purpose of illustrating a motorcycle seat trough in use, and forms no part of the claimed design.