Honda Outboards BF40A/BF50A Service Manual, Page 25Get this manual
HONDA BF35A45A
DENGINE DOES NOT RUN SMOOTHLY
Engine starts but stops soonPoor
I idle performanceI
1) Wet fouled spark plug caused from excessive choke application Start the engine with the choke fully open and the throttle fully closed21 Faulty spark plugadjust, or replace3) Carburetor synchronization misadjusted -Adjust properly4) Carburetor pilot screwstop screw misadjusted Adjust properly 5) Carburetor slow circuit clogged with dirt6) Overflowed carburetor Drain the carburetor and prime againIf still not goodoverhaul the carburetor7) Secondary air sucked caused from damaged carburetor insulator gasket Replace
Engine speed does not increase
1) Choke not returned properly1Return2) Throttle cable misadjusted Adjust properly3) Propeller mismatched Select correct propeller4) Engine overheats, engine oil pressure drops abnormally(Warning system functionsFaulty spark plug Clean, adjust, or replace6) Clogged fuel filter -Replace71 Waterdirt in carburetor -the carburetorOverhaul if it is still no good8) Incorrect valve timingReinstall the timing belt