I claim the ornamental design for a motorcycle steering stabilizer, as shown and described.
FIG. 1 is an isometric view from slightly above the motorcycle steering stabilizer, showing a first side and back of the motorcycle steering stabilizer.
FIG. 2 is a lateral view of a first side of the motorcycle steering stabilizer.
FIG. 3 is a lateral view of a second side of the motorcycle steering stabilizer.
FIG. 4 is a lateral view of a back of the motorcycle steering stabilizer.
FIG. 5 is a lateral view of a front of the motorcycle steering stabilizer.
FIG. 6 is a plan view of the top of the motorcycle steering stabilizer; and,
FIG. 7 is a plan view of the bottom of the motorcycle steering stabilizer. The dot-dash lines forming a large circle immediately adjacent the shaded areas represent boundaries between claimed and unclaimed portions of the motorcycle steering stabilizer, and form no part of the claimed design. The smaller dot-dash line circle which is concentric with the dot-dash boundaries represents environmental structure that forms no part of the claimed design.
The remaining circles shown in dot-dash lines in FIGS. 1, 6, and 7 represent boundaries of openings that form no part of the claimed design.