The ornamental design for a motorcycleswingarm, as shown and described.
FIG. 1 is an isometric top side view of a motorcycle swingarm showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is an elevational front view thereof;
FIG. 5 is an elevational rear view thereof, with portions shown in broken lines forming no part of the claimed design;
FIG. 6 is an elevational view of a first side thereof; and,
FIG. 7 is an elevational view of a second side thereof.
The broken lines in the figures including the broken lines immediately adjacent the shaded areas in FIGS. 1–4, 6, and 7, represent the boundaries of the claimed design and form no part thereof.