The ornamental design for a side light for a motorcycle, as shown and described.
FIG. 1 is an isometric view of a side light for a motorcycle in accordance with my new design.
FIG. 2 is a side view of the side light for a motorcycle of FIG. 1 with part of a motorcycle shown in broken lines and forming no part of the claimed design.
FIG. 3 is a front side view of the side light for a motorcycle of FIG. 1.
FIG. 4 is a back side view of the side light for a motorcycle of FIG. 1.
FIG. 5 is a right side view of the side light for a motorcycle of FIG. 1.
FIG. 6 is a left side view of the side light for a motorcycle of FIG. 1.
FIG. 7 is a top side view of the side light for a motorcycle of FIG. 1; and,
FIG. 8 is a bottom side view of the side light for a motorcycle of FIG. 1.