Honda Outboards BF40A/BF50A Service Manual, Page 286Get this manual
BF40A-BF50A Engine Does Not Run Smoothly
Engine starts, but stalls soonIdle speed is not stable or stalls
Faulty Automatic SE (Starting Enrichment) valve.I I
Inspect: P5-18 and 19
Spark plug faulty
Clean and adjust or replace (see base shop manual)Adjust (see base shop manual)
Carburetor pilot screw andor throttle stop screw misadjusted
Carburetor slow circuit clogged
Overhaul and clean carburetor: P5-15 thru17