Yamaha F6A Manuel D'utilisation page 160

5) With the outboard motor in an vertical
position, using a flexible or pressurized
filling device, inject the gear oil into the
oil drain plug hole.
Gear oil grade/capacity:
Refer to SPECIFICATIONS on page 4-1.
6) When the oil begins to flow out of the oil
level plug hole, insert and tighten the oil
level plug.
7) Insert and tighten the oil drain plug.
4-49
GB