Honda BF75D Owner's Manual page 83

Oil filler cap removal (Unlock):
OIL FILLER CAP
Rib of the alternator
cover
1)Turn the oil filler cap 90°
counterclockwise so the lug of the
cap sets horizontally.
2)Pull the cap to remove it.
Running the engine with a low oil
level can cause engine damage.
SERVICING YOUR OUTBOARD MOTOR
5. Install the oil filler cap and tighten
it securely. Do not overtighten.
Oil filler cap installation (Lock):
1)Insert the oil filler cap into the oil
filler port with the lug being set
horizontally.
2)Turn the oil filler cap 90°
clockwise so the lug of the cap is in
line with the rib of the alternator
cover. (It should click.)
6. Install and lock the engine cover.
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