The ornamental design for a frame for motorscooter, as shown and described.
FIG. 1 is a perspective view from the right side of a frame for motor scooter.
FIG. 2 is a perspective view from the left side thereof.
FIG. 3 is a perspective view from the right side thereof.
FIG. 4 is a front elevation view thereof.
FIG. 5 is a left side elevation view thereof; and,
FIG. 6 is a top plan view thereof.
The portion of the motor scooter shown in broken lines is for the purpose of showing environmental structure only and forms no part of the claimed design. The dash-dot-dash lines represent the boundaries of the claimed design and form no part thereof.