Stopping Engine; Procedure; Trimming Outboard Motor - Yamaha 4AC Owner's Manual

Operation
NOTE:
The outboard motor can turn 360° in its brack-
et (full-pivot system). The boat can also be
backed up by simply turning the outboard mo-
tor around 180° with the steering handle fac-
ing toward you.
EMU27820

Stopping engine

Before stopping the engine, first let it cool off
for a few minutes at idle or low speed. Stop-
ping the engine immediately after operating at
high speed is not recommended.
EMU27832

Procedure

1. Push and hold the engine stop button un-
til the engine comes to a complete stop.
2. After stopping the engine, tighten the air
vent screw on the fuel tank cap and set
the fuel cock lever or knob to the closed
position, if equipped.
23
3. Disconnect the fuel line if you are using
an external fuel tank.
NOTE:
If the outboard motor is equipped with an en-
gine stop switch lanyard, the engine can also
be stopped by pulling the lanyard and remov-
ing the lock plate from the engine stop switch.
EMU27861

Trimming outboard motor

The trim angle of the outboard motor helps
determine the position of the bow of the boat
in the water. Correct trim angle will help im-
prove performance and fuel economy while
reducing strain on the engine. Correct trim an-
gle depends upon the combination of boat,
engine, and propeller. Correct trim is also af-
fected by variables such as the load in the
boat, sea conditions, and running speed.
EWM00740
WARNING
Excessive trim for the operating condi-
tions (either trim up or trim down) can
cause boat instability and can make steer-
ing the boat more difficult. This increases
the possibility of an accident. If the boat
begins to feel unstable or is hard to steer,
slow down and/or readjust the trim angle.