What was found
THE PILOT/OWNER ATTEMPTED TO START THE PLANE. AFTER THE FIRST FAILED START, THE PROPELLER STOPPED SPINNING DURING THE SECOND ATTEMPTED START. THE PILOT ABORTED THE START AND ALERTED ME TO A GRINDING SOUND. UPON INSPECTING THE ENGINE, THE LEFT MAGNETO HOUSING HAD CRACKED AND THE MAGNETO BECAME DISLODGED FROM THE ENGINE. WHEN REMOVING THE MAGNETO, THE IMPULSE COUPLING SPRING FLEW OUT OF THE CRANKCASE. I WAS ABLE TO RECOVER SOME OF THE IMPULSE COUPLING BODY, AND THE SPRING, BUT THE CAM AND COUNTERWEIGHTS HAD FALLEN INTO THE CRANKCASE CAUSING DAMAGE. THE RETAINING NUT AND COTTER PIN WERE STILL INSTALLED, SO THE COUNTERWEIGHT BODY CRACKED AND FELL IN THE CASE DURING THE START PROCEDURE. THE ENGINE WAS REMOVED AND SEND TO RAM AIRCRAFT LP IN WACO, TX FOR DISASSEMBLY AND ANALYSIS.