What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) The pilot privacy data omitted departed the Wadena municipal airport when he experienced smoke and then fire coming from the engine cowling while in flight. He made an emergency landing at an abandoned airfield in the town of Wadena, approximately 5 miles east of the departure airport. Post incident inspection of the aircraft revealed the damage to be limited to fire damage in the engine compartment of the aircraft, with the fire being concentrated in and around the carburetor area and the lower left hand side of the engine itself. Examination of the exhaust muffler under the heat shroud revealed extensive cracking and errosion of the muffler. The condition of the muffler was allowing hot exhaust gases to be directed into the carburetor.
As the FAA filed it
(-23) THE PILOT ^PRIVACY DATA OM^ DEPARTED THE WADENA MUNICIPAL AIRPORT WHEN HE EXPERIENCED SMOKE AND THEN FIRE COMING FROM THE ENGINE COWLING WHILE IN FLIGHT. HE MADE AN EMERGENCY LANDING AT AN ABANDONED AIRFIELD IN THE TOWN OF WADENA, APPROXIMATELY 5 MILES EAST OF THE DEPARTURE AIRPORT. POST INCIDENT INSPECTION OF THE AIRCRAFT REVEALED THE DAMAGE TO BE LIMITED TO FIRE DAMAGE IN THE ENGINE COMPARTMENT OF THE AIRCRAFT, WITH THE FIRE BEING CONCENTRATED IN AND AROUND THE CARBURETOR AREA AND THE LOWER LEFT HAND SIDE OF THE ENGINE ITSELF. EXAMINATION OF THE EXHAUST MUFFLER UNDER THE HEAT SHROUD REVEALED EXTENSIVE CRACKING AND ERROSION OF THE MUFFLER. THE CONDITION OF THE MUFFLER WAS ALLOWING HOT EXHAUST GASES TO BE DIRECTED INTO THE CARBURETOR.