Honda BF40D Owner's Manual page 94

CLEANING AND FLUSHING
COOLING SYSTEM INDICATOR
8. Start the engine. Monitor the
cooling system indicator. Stop the
engine if water does not come out
of the cooling system indicator and
check the fresh water supply.
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9. Allow the engine to run at idle for
at least 5 minutes to clean the
inside of the outboard motor.
10. Stop the engine, and disconnect
the fuel hose from the outboard
motor. Remove the garden hose
adapter.
11. Remove the sealing washer from
the garden hose adapter and install
the sealing washer on the wash
screw.
If tape was used to cover the three
water intakes in step 6, remove the
tape now.
12. Install the wash screw into the gear
case securely.
13. Tilt up the outboard motor and
move the tilt lock lever to the
LOCK position.