I claim the ornamental design for a portion of a motorcycle oil dipstick, as shown and described.
FIG. 1 is a perspective view of a portion of a motorcycle oil dipstick
embodying the present invention and mounted on a motorcycle.
FIG. 2 is an enlarged perspective view of the design shown in FIG. 1.
FIG. 3 is a top view of the design shown in FIG. 1; and,
FIG. 4 is a side view of the design shown in FIG. 1.
The broken line showing of the environment is for illustrative purposes
only and forms no part of the claimed design. The broken lines that define
the boundaries of the claimed design forms no part thereof.