As a last resort you can adjust the air vane governor (to increase the engine speed) if you feel the engine is running too slow, you can adjust the engine RPM by turning the toothed wheel just below the air vane using this procedure. On the left side of the mower (as viewed from the operators position), grab the air vane with one finger (to keep it from pivoting) and turn the toothed wheel below it clockwise (or to the left from that position). Each click increases the engine RPM by 50-70 RPM.
Jeff
Jeff