Yamaha F25 User Manual download pdf (Page 31)

Operation

26

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.

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.

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 perfor-

mance further, and the boat may “porpoise”

(hop in the water), which could throw the op-

erator and passengers overboard.

1. Trim rod

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