Honda Outboards BF40A/BF50A Service Manual, Page 212Get this manual
HONDA BF31!5A '4!5A
OPERATION
ELECTRICAL SYSTEM 17-2
POWER TRIMTILT SYSTEM 17-10 POWER TRIMTILT FUNCTION 17-12 GAS ASSISTED SYSTEM 17-19 CARBURETOR ACCELERATION! DECELERATION SYSTEM 17-22