As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE RAN POORLY ON CLIMB FROM BANNER PICK UP - ABOUT 1200 FT AGL ENGINE ONLY PRODUCED 100 RPM WITH BLACK SMOKE COMING FROM EXHAUST STACKS. NR 2D, NR 4 SPARK PLUGS WERE BLACK WITH SOOT. IT WAS DETERMINED THAT THE CARBURETOR WAS NOT FUCTIONING PROPERLY. R/P CARBURETOR WITH MA4SPR-10-3678-32, SER A-109983 KAE 07064. ENGINE HAS RUN FINE SINCE CARBURETOR INSTALLATION.