What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: aircraft in cruise flight from sioux city to airlake at 7500 feet altitude, when aircraft reportedly "lurched". Pilot retarded power and heard a loud bang. Power was reduced and cabin filled with smoke, probably due to engine oil on the exhaust system. Aircraft was vectored to fbl by air traffic (msp approach) and made a safe landing. No further damage to the aircraft was reported, and there were no injuries to the pilot or his two passengers. Not a pilot deviation. Reported that engine cylinder #3 was worked on prior to that cylinder's piston rod failing and exiting through the engine case.
As the FAA filed it
NARRATIVE: AIRCRAFT IN CRUISE FLIGHT FROM SIOUX CITY TO AIRLAKE AT 7500 FEET ALTITUDE, WHEN AIRCRAFT REPORTEDLY "LURCHED". PILOT RETARDED POWER AND HEARD A LOUD BANG. POWER WAS REDUCED AND CABIN FILLED WITH SMOKE, PROBABLY DUE TO ENGINE OIL ON THE EXHAUST SYSTEM. AIRCRAFT WAS VECTORED TO FBL BY AIR TRAFFIC (MSP APPROACH) AND MADE A SAFE LANDING. NO FURTHER DAMAGE TO THE AIRCRAFT WAS REPORTED, AND THERE WERE NO INJURIES TO THE PILOT OR HIS TWO PASSENGERS. NOT A PILOT DEVIATION. REPORTED THAT ENGINE CYLINDER #3 WAS WORKED ON PRIOR TO THAT CYLINDER'S PISTON ROD FAILING AND EXITING THROUGH THE ENGINE CASE.