Honda BF8D Owner's Manual page 110

TAKING CARE OF UNEXPECTED PROBLEMS
If water is flowing from the cooling
system indicator, continue idling for
30 seconds. If the cooling system is
OK, the red indicator should go off
within 30 seconds (R types), and the
engine will respond normally to
throttle grip or control lever
operation.
If there is no water flowing from the
cooling system indicator, stop the
engine, and tilt the outboard motor to
inspect the water intake screens. If
clogged, clean the water intake
screens, return the outboard motor to
the running position, restart the
engine, and check the cooling system
indicator again.
If there is still no water flowing from
the cooling system indicator, or if the
engine protection system remains
activated after 30 seconds, return to
the nearest boat landing, and have the
outboard motor inspected by an
authorized Honda Marine dealer.
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