What was found
PILOT REPORTED ROUGH ENGINE AND LOSS OF POWER AND BEING UNABLE TO CLIMB TO A SAFE ALTITUDE. OPTED TO MAKE PRECAUTIONARY LANDING ON BEACH. AIRCRAFT UNDAMAGED. UPON INSPECTION, NR 3 CYLINDER HAD NO COMPRESSION. SUBMITTER REMOVED CYLINDER AND FOUND A HOLE BURNED THROUGH CYLINDER HEAD BETWEEN THE SPARK PLUG AND THE EXHAUST VALVE. UPON FURTHER EXAMINATION, NOTED THE INTAKE TUBE WAS LOOSE IN THE SUMP HOUSING.