As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
I WAS HAVING DIFFICULTY TIMING THE RT MAGNETO. REMOVED IT, REMOVED DISTRIBUTOR BLOCK AND GEAR. NOTICED THE ROTOR GEAR WAS LOOSE. I PULLED ON IT AND IT CAME RIGHT OFF WITH PART OF THE ROTOR CAM HOLDER WITH IT. IT WAS CLEARLY BROKEN PRIOR TO REMOVING THE GEAR.