What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Pilot left residence enroute to chiloquin airport. Pilot reported that engine sputtered and failed. Aircraft contacted terrain north of hwy 97 at upper end of klamath river. Pilot airlifted to hospital with sustainable/substantial injuries. A/c had 2 seats and was being operated without an exemption from FAR 103.1(a). (From amended 8020-23) follow-up information revealed that airplane fuel was drained and refilled before flight (automotive fuel). Pilot experienced rough-running engine and aborted takeoff twice. Changed spark plugs. Took off and experienced engine failure approximately 3 nautical miles from takeoff.
As the FAA filed it
(-23) PILOT LEFT RESIDENCE ENROUTE TO CHILOQUIN AIRPORT. PILOT REPORTED THAT ENGINE SPUTTERED AND FAILED. AIRCRAFT CONTACTED TERRAIN NORTH OF HWY 97 AT UPPER END OF KLAMATH RIVER. PILOT AIRLIFTED TO HOSPITAL WITH SUSTAINABLE/SUBSTANTIAL INJURIES. A/C HAD 2 SEATS AND WAS BEING OPERATED WITHOUT AN EXEMPTION FROM FAR 103.1(A). (FROM AMENDED 8020-23) FOLLOW-UP INFORMATION REVEALED THAT AIRPLANE FUEL WAS DRAINED AND REFILLED BEFORE FLIGHT (AUTOMOTIVE FUEL). PILOT EXPERIENCED ROUGH-RUNNING ENGINE AND ABORTED TAKEOFF TWICE. CHANGED SPARK PLUGS. TOOK OFF AND EXPERIENCED ENGINE FAILURE APPROXIMATELY 3 NAUTICAL MILES FROM TAKEOFF.