Incident Description
The pilot reported that during the en route portion of the flight, the aircraft's engine began to run rough. The pilot attempted to restore power by applying carburetor heat, moving the mixture control to full rich, and advancing the throttle to the full open position. According to the pilot, these actions did not result in a significant increase in engine power. After circling the aircraft for a short period, the pilot executed an emergency landing. The ambient temperature at the time was 87 degrees, and the dew point was 67 degrees.
Engine Inspection
An inspection of the engine was conducted following the landing. The examination discovered that the spark plugs were sooted. Specifically, the Number 2 and Number 4 lower spark plugs exhibited oil fouling. The inspection did not verify any mechanical failure or malfunction; no apparent defects were found.
Landing and Damage
The emergency landing was carried out, and during the landing roll, the aircraft encountered a gulley. This encounter resulted in damage to the aircraft. There were no reports of injuries to the pilot.