Yamaha 9.9 15 Outboard Motor User Manual


 
Operation
36
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.
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.
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.
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.
WARNING
EWM00400
Stop the engine before adjusting the
trim angle.
Use care to avoid being pinched when
removing or installing the rod.
Use caution when trying a trim position
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.
T
IP:
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-
1. Trim operating angle
ZMU02043
1
1. Trim rod
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