Honda Outboards BF40A/BF50A Service Manual, Page 217Get this manual
HONDA BF35A4EiA
",3Overheatoil pressure alert system
The BF35A 45A is equipped with the overheatoil pressure alert system which protects the engine by controlling the engine speed in the CDI circuit when the engine is overheated or oil pressure drops
Principal operation
When trouble occurs, the system slows down the engine speed gradually, as sharp drop of the engine speed is very dangerous for the operator as if the boat is braked suddenly When the trouble is solvedit also increases the engine speed slowly and graduallyThe system is provided with the indicator lamps and buzzuer sound (remote control type) to indicate the cause of trouble to the operator1) Engine speed control
Buzzer sounds
Alert sensor OFF
[13) 12.5 Under way _se_c_-; speed