Adjusting Boat Trim - Yamaha 40X Owner's Manual

Operation
board motor when adjusting the trim
angle. Body parts can be crushed be-
tween the motor and the clamp bracket
when the motor is trimmed or tilted.
Use caution when trying a trim position
●
for the first time. Increase speed gradu-
ally and watch for any signs of instabil-
ity or control problems. Improper trim
angle can cause loss of control.
If equipped with a power trim and tilt
●
switch located on the bottom cowling,
use the switch only when the boat is at
a complete stop with the engine off. Do
not adjust the trim angle with this
switch while the boat is moving.
Adjust the outboard motor trim angle using
the power trim and tilt switch.
1. Power trim and tilt switch
To raise the bow (trim-out), press the switch
" " (up).
To lower the bow (trim-in), press the switch
" " (down).
Make test runs with the trim set to different
angles to find the position that works best for
your boat and operating conditions.
EMU27912

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
46
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. When the bow of
the boat is down, it is easier to accelerate
from a standing start onto plane.
Bow Up
Too much trim-out puts the bow of the boat
too high in the water. Performance and econ-
omy are decreased because the hull of the
boat is pushing the water and there is more
air drag. Excessive trim-out can also cause
the propeller to ventilate, which reduces per-
formance further, and the boat may "por-
poise" (hop in the water), which could throw
the operator and passengers overboard.
Bow Down
Too much trim-in causes the boat to "plow"
through the water, decreasing fuel economy
and making it hard to increase speed. Oper-
ating with excessive trim-in at higher speeds