Internal Combustion Engine

FIG. 1 is a front elevational view of an internal combustion engine showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front and right side perspective view thereof; and,

FIG. 8 is a rear and left side perspective view thereof.

The portions of the article shown in broken lines form no part of the claimed design.