Adjusting Trim Angle For Manual Tilt Models; Adjusting Boat Trim - Yamaha 4AC Owner's Manual

1. Trim operating angle
EMU27872
Adjusting trim angle for manual tilt
models
There are 4 or 5 holes provided in the clamp
bracket to adjust the outboard motor trim an-
gle.
1. Stop the engine.
2. Tilt the outboard motor up, and then re-
move the trim rod from the clamp bracket.
1. Trim rod
3. Reposition the rod in the desired hole.
To raise the bow ("trim-out"), move the rod
away from the transom.
To lower the bow ("trim-in"), move the rod to-
ward the transom.
Make test runs with the trim set to different an-
gles to find the position that works best for
your boat and operating conditions.
EWM00400
WARNING
Stop the engine before adjusting the
G
trim angle.
Use care to avoid being pinched when
G
removing or installing the rod.
Use caution when trying a trim position
G
for the first time. Increase speed gradu-
ally and watch for any signs of instability
or control problems. Improper trim an-
gle can cause loss of control.
NOTE:
The outboard motor trim angle can be
changed approximately 4 degrees by shifting
the trim rod one hole.
EMU27911

Adjusting boat trim

When the boat is on plane, a bow-up attitude
results in less drag, greater stability and effi-
ciency. This is generally when the keel line of
the boat is up about 3 to 5 degrees. With the
bow up, the boat may have a greater tenden-
cy to steer to one side or the other. Compen-
sate for this as you steer. The trim tab can
also be adjusted to help offset this effect.
When the bow of the boat is down, it is easier
to accelerate from a standing start onto plane.
Operation
24