As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE STOP UNCOMMANDED WHILE TAXIING BACK TO MY HANGAR AT MY HOME AIRPORT. DISCOVERED AFTER REMOVING ACCESSORY CASE THAT THE IDLER GEAR BRONZE BUSHING FELL OUT AND CRANKSHAFT GEAR PIN/DOWEL WAS SHEARED OFF AND CRANKSHAFT GEAR AND BOLT WERE LOOSE AND THE TAB OF THE BOLT'S LOCKPLATE AEL18639 WAS BROKEN OFF.