The ornamental design for a pair of motorcycleenginecylinder head covers, as shown and described.
FIG. 1 is a perspective view of the left and right pair of motorcycle engine cylinder head covers, the left cover being a rear perspective view and the right cover being a front perspective view embodying my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right side elevation view thereof; and,
FIG. 7 is a left side elevation view thereof.
The base, mounting tabs, top surface protrusions, and LED lights of each cylinder head cover shown in broken lines form no part of the claimed design.