Honda Outboards BF40A/BF50A Service Manual, Page 288Get this manual
BF40A-BF50A
bIGNITION SYSTEM
These outboard motors are equipped with an engine overrev limiter which is provided in the ignition control moduleThe overrev limiter is activated when the engine speed exceeds 6,300 rpmWhen activated the sparks are emitted to the No.1, No.2 and NO.3 cylindersThe overrev limiter may be activated under such conditions as; light propeller load or propeller ventilation
Hard Starting
1Measure the spark plug gap and perform the spark test (See base shop manual)
Standard plug: DR7EA (NGK), X22ESR-U (DENSO)
Plug gap: 0.60.7 mm (0.240.28 in)