The ornamental design for an engine for a brushcutter, as shown and described.
FIG. 1 is a front perspective view of an engine for a brushcutter in accordance with our new design;
FIG. 2 is a rear perspective view of the engine for a brushcutter in accordance with our new design;
FIG. 3 is a front elevational view of the engine for a brushcutter in accordance with our new design;
FIG. 4 is a rear elevational view of the engine for a brushcutter in accordance with our new design;
FIG. 5 is a top plan view of the engine for a brushcutter in accordance with our new design;
FIG. 6 is a bottom plan view of the engine for a brushcutter in accordance with our new design;
FIG. 7 is a right side elevational view of the engine for a brushcutter in accordance with our new design;
FIG. 8 is a left side elevational view of the engine for a brushcutter in accordance with our new design; and,
FIG. 9 is a front perspective view of the engine for a brushcutter in accordance with our new design illustrating a state in which a brushcutter attachment is attached to the engine.
The broken lines showing environment in FIGS. 1-9 represents unclaimed subject matter and forms no part of the claimed design.