As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ONE MAGNETO DIST. GEAR HAD 1 TOOTH BROKEN OFF THE OTHER DIST YEAR HAD A 13 TOOTH SECTION BROKEN OFF. SUSPECT THE ONE TOOTH BROKE AND TOOK OUT SECOND GEAR TEETH, LT MAG STOPPED WORKING ON TAKEOFF AND PILOT RETURNED TO AIRPORT. RT MAG WORKED WITH 1 TOOTH MISSING. CARBURETOR MAY HAVE CAUSED BACKFIRE. CARB SENT IN FOR OVERHAUL AND CHECKED FOR LEAN MIXTURE. (K)