Yamaha F6A Owner's Manual page 110

3) Tighten the air vent screw on the fuel
tank cap after stopping the engine, if it is
equipped.
4) Remove the key if the boat will be left
unattended.
NOTE:
@
The engine can also be stopped by pulling
the lanyard and removing the lock plate from
the engine stop lanyard switch (then turning
the main switch to "OFF").
3-39
GB