Honda BF5A Owner's Manual page 31

Gear oil check/change
Recommended oil:
Marine SAE 90 hypoid gear oil
API Service Classification(GL-4 or GL-5)
Oil Capacity: 0.1 0 (0.1 US qt , 0.1 Imp qt)
Oil level check
Check the oil level when the motor is in the vertical position. Remove the
level plug and see if oil flows out.
If no oil flows out, use a commercially available oil pump or squeeze tube to
fill the gear case with the recommended gear oil. Pump or squeeie fresh oil
through the OIL DRAIN plug hole until oil begins flowing out through the OIL
LEVEL plug hole.
If there is water in the oil, the water will flow out first when the drain plug
is removed, or the oil will be a milky color.
If water is detected in the oil, the outboard motor should be inspected by
an authorized Honda Outboard Motor dealer.
Oil change
Remove the level plug and drain plug and allow the gear oil to thoroughly
drain into a suitable container.
Pump or squeeze the recommended gear oil through the OIL DRAIN plug
hole until oil starts flowing out through the OIL LEVEL plug hole.
Use new sealing washers and install the oil level plug first and then the oil
drain plug. Tighten securely.
SQUEEZE TUBE
Starter rope check
Check the starter rope every 6 months or after every 100 hours of
outboard motor operation. Replace the rope if it is frayed. Always keep a
replacement starter rope in your kit.
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