I claim the ornamental design for a motorcycle steering stabilizer, as shown and described.
FIG. 1 is an isometric view from slightly above of 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 illustrate boundaries between claimed and unclaimed portions of the motorcycle steering stabilizer, and form no part of the claimed design.