Suzuki DF2.5 Owner's Manual page 16

Make a test run in the boat to determine if the
trim angle needs to be adjusted.
To adjust the trim angle:
1. Lock the motor in the fully tilted up position.
(Refer to the TILT UP LOCK ARM section.)
2. Turn the lock nut 1 counterclockwise while
holding the nut 2. Loosen the nut 2.
3. Pull the spacer 3 and tilt pin 4 out to the
limit on both sides of the swivel bracket.
4. Reposition the tilt pin in the desired holes.
5. Push the spacer 3 and tilt pin 4 back in
and tighten the nut 2 and locknut 1.
6. Lower the motor back down.
To lower the bow, move the pin towards the
boat. To raise the bow, move the pin away from
the boat.
14
After you have made an adjustment to the trim
angle, make another test run to make sure you
have adjusted it to the correct angle.
 WARNING
Trim angle greatly affects steering stabil-
ity. If the trim angle is too small, the boat
may "plow" or "bow steer". If the trim
angle is too large, the boat may "chine
walk" from side to side or "porpoise" up
and down. These conditions, which result
in loss of steering control, can cause
occupants to be thrown overboard.
Always maintain proper trim angle based
on the combination of your boat, engine,
and propeller, as well as operating condi-
tions.
 WARNING
If you operate the motor with the tilt pin
removed, you may not be able to control
steering as expected.
Do not operate the motor with the tilt pin
removed.