As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT WAS RUNNING AT 100 PERCENT JUST BEFORE LIFT OFF WHEN THE PILOT AND PASSENGER HEARD 2 SPUTTERS FOLLOWED BY THE ENGINE SHUTTING DOWN. AFTER FURTHER INVESTIGATION, BOTH MAGNETOS WERE FOUND TO HAVE SEVERAL SHEARED PLASTIC TEETH ON THE DISTRIBUTOR GEAR. BOTH MAGNETOS WERE REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.MAGNETOS P/N 10-600646-3 AND 10-600646-201.