The ornamental design for a frontcover for a motor scooter, as shown and described.
FIG. 1 is a perspective view of a front cover for a motor scooter, showing our new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a right side elevation view thereof; and,
FIG. 5 is a left side elevation view thereof.
The de-emphasized halftone portions and the area indicated in dashed lines shown in the drawings illustrate environmental structure for a front cover for a motor scooter that form no part of the claimed design.