As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STUDENT PILOT REPORTED THROTTLE WOULD NOT ADVANCE BEYOND IDLE. FOUND CARBURETOR BINDKING INTERNALLY. DISASSEMBLED CARBURETOR AND FOUND AIR METERING PIN STOP PIN WORN WHICH ALLOWED AIR METERING PIN TO EXTEND BEYOND NORMAL RANGE AND JAM BETWEEN STOP PIN AND ACTUATING ARM ON PUMP LEVER ASSEMBLY. (K)