As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED ENGINE NOT DEVELOPING FULL POWER. GROUND RUN CONFIRMED THIS. INSPECTION FOUND PIECE OF CARBURETOR HEAT VALVE SEAL MATERIAL (.25 INCH BY 3 INCHES) STUCK AROUND THE VENTURI OF THE CARBURETOR. THE PIECE WAS REMOVED AND THE SEAL WAS TRIMMED. THE ENGINE RUN-UP WAS NORMAL.