As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPORTED PROBLEM WAS PARTIAL ENGINE POWER LOSS DURING CLIMB OUT. UPON INSPECTION OF ENGINE AND ACCESSORIES THE CARBURETOR WAS FOUND TO HAVE THE PARTING FLANGE SEPARATING. THE ORIGINAL SCREWS AND LOCKING TAB WASHERS WERE ALL INSTALLED BUT LOOSE. SLIGHT FUEL STAINING FROM PARTING FLANGE WAS EVIDENT ON BOWL. PROBABLE CAUSE WAS SHRINKING OF PARTING FLANGE GASKET CAUSING LOOSENING OF ATTACHMENT HARDWARE. THE ENTIRE VIBRATION CAUSING THREAD WEAR ON BOWL.