What was found
(CAN) AT GROUND RUN-UP AT 15 DEGREES C AT 1700 RPM, SAME PROBLEM AS SDR 960131010. THE NOZZLE HAD BEEN CHANGED ON 3 APRIL 1995. THE AIRCRAFT WAS FLOWN FOR 436.9 HOURS WITHOUT A SIMILAR PROBLEM - HAVE CHANGED THE CARBURETOR, INSTALLED MA-3SPA P/N 10-4894V, S/N 1410624. BEFORE THIS PROBLEM SHOWING UP, CAUSED BY COMPLYING WITH SB MSA-7, WHICH HAD BEEN INTRODUCED TO CORRECT VAPORIZATION AND TOO RICH MIXTURE DURING HOT WEATHER. SUBMITTER BELIEVES THAT PROBLEM WAS WITH COMPLYING WITH SEB 92-3 AND TO THE WRONG CONFIGURATION OF VENTURIES P/N 46F123.