Honda BF5A Owner's Manual page 36

Servicing a submerged motor
A submerged motor must be serviced immediately after it is recovered
from the water in order to minimize corrosion.
If there is a Honda outboard motor dealership nearby, take the motor
immediately to the dealer. If you are far from a dealership, proceed as
follows:
l.Remove the engine cover, and rinse the motor with fresh water to
remove salt water, sand, mud, etc.
2. Loosen the carburetor drain screw (p. 37 1, drain the contents of the
carburetor into a suitable container, then tighten the drain screw.
3,Change the engine oil (p, 28 1. If there was water in the engine
crankcase, or the used engine oil showed signs of water contamination,
then a second engine oil change should be performed after running the
engine for l/2 hour.
4. Remove the spark plugs. Disengage the emergency stop switch clip from
the engine stop switch and pull the recoil starter several times to
corn letely expel water from the cylinders.
p5+
l
When cranking the engine with an open ignition circuit (spark plug
removed from the ignition circuit), disengage the emergency stop
switch clip from the engine stop switch to prevent electrical damage to
the ignition system.
. If the motor was running when it submerged, there may be mechanical
damage, such as a bent connecting rod. If the engine binds when
cranked, do not attempt to run the motor until it has been repaired.
5. Pour a teaspoon of engine oil into the spark plug hole, then pull the recoil
starter several times to lubricate the inside of the cylinder. Reinstall the
spark plug and engage the emergency stop switch clip with the engine
stop switch.
6. Attempt to start the engine.
If the engine fails to start, remove the spark plug clean and dry the
electrode, then reinstall the spark plug and attempt to start the engine
again.
If the engine starts, and no mechanical damage is evident, continue to
run the engine for l/2 hour or longer (be sure the water level is at least 2
inches above the anti-ventilation plate).
7.As soon as possible, take the motor to a Honda outboard motor dealer
for inspection and ser -
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