The ornamental design for a motorcycle, as shown and described.
FIG. 1 is a top, front, right perspective view of a motorcycle showing my new design;
FIG. 2 is a right side view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a rear right perspective view thereof; and,
FIG. 5 is an enlarged view of FIG. 4 with environment removed to enhance clarity.
The broken lines immediately adjacent to the shaded area represent unclaimed boundaries of the design. The broken lines showing the remainder of the motorcycle represent unclaimed subject matter and form no part of the claimed design. Pursuant to MPEP 608.02(VIII), FIGS. 1-5 are lined for the color orange.