What was found
MAGNETOS OVERHAULED WITH NEW ELECTROSYSTEM CONDENSER, PN E510-349276, CODE NR 03108 AND NR 9544. MAGNETOS CHECKED ON TEST STAND, OPERATED NORMALLY. MAGS INSTALLED AND TIMED TO ENGINE. DURING GROUND RUN, 3 MAGS CHECKED NORMAL. FOURTH MAG DEVELOPED A 1,000 RPM DROP. CHECKED MAG, FOUND BAD CONDENSER. REPLACED CONDENSER WITH NEW CONDENSER. GROUND RUN, SAME PROBLEM DEVELOPED. REPLACED CONDENSER WITH A USED BENDIX CONDENSER. ENGINE RAN NORMAL.