What was found
AFTER STARTING LEFT ENGINE, AN ELECTRICAL ODOR WAS NOTICED IN THE COCKPIT. TROUBLESHOT AND FOUND LT ENGINE STARTER/GENERATOR TO HAVE BURNED SMELL FOLLOWING ENGINE START. ALSO, EXCESSIVE AMOUNT OF BLACK SOOT ON LOWER ENGINE AFT OF STARTER/GEN EXHAUST. CONFIRMED WITH CREW THAT ODOR WAS THROUGH GASPER. AS PRECAUTION, INSPECTED COCKPIT CIRCUIT BREAKER PANELS AND ENGINE START SWITCHES WITH NO DEFECTS NOTED. REPLACED LT ENGINE STARTER/GENERATOR WITH AN O/H UNIT. OPS CHECKED GOOD. VERIFIED THAT NO ELECTRICAL ODORS OCCURRED IN COCKPIT OR AT LT ENGINE STARTER/GEN FOLLOWING START SEQUENCE.