As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT EXPERIENCED ROUGH RUNNING ENGINE SHORTLY AFTER TAKEOFF. INSPECTION OF THE MAGNETO REVEALED A SEVERLY WORN BRONZE BUSHING ON THE DISTRIBUTOR BLOCK. ROUGH RUNNING WAS ATTRIBUTED TO INTERNAL CONTAMINATION OF THE MAGNETO WITH FINE BRONZE FILINGS, PARTIALLY SHORTING THE CONTACTS.