Honda Outboards BF40A/BF50A Service Manual, Page 24Get this manual
HONDA BF3!5A o4!5A
STARTER MOTOR
Engine does not startDoes not turnCheck whether the starter motor turns Does not turn No Check the battery forgood charging condition Check the battery terminals for connectionand corrosionj Does Good not soundCheck the starter relay for operating soundCharge the battery or replace Connect the battery terminals securely, or remove the corrosion Key switch Connect securelyo Check and repair the wire to the starter relayo Repair or replace the starter relay
Check whether engine turns;
TurnsSounds
Check the pinion No ring gear for engage- good mentJ
Check the pinion and ring gear for engagement
Check the return spring for fatigue and the pinion for movementCorrect the pinion and ring gear engagement, or replace
good Check or replace the pinion roller clutch
Connect the battery and starter motor terminal and check whether the starter motor turnsTurnsPoor contact of the starter relayReplace