Suzuki DF70A Owner's Manual page 22

 WARNING
Trim angle greatly affects steering stability. 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 condi-
tions, 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 pro-
peller, as well as operating conditions.
 WARNING
When the motor is tilted beyond the maximum
trim position, the swivel bracket will not have
side support from the clamp bracket and the
tilt system will be unable to cushion the
engine if the lower unit strikes an obstruction.
This could lead to occupant injury.
Do not operate the engine above 1500 r/min or
operate the boat in a planing attitude with the
motor tilted beyond the maximum trim posi-
tion.
NOTICE
If you operate the boat with the motor trimmed
beyond the maximum trim position, the water
intake holes may be above the water line,
causing severe engine damage due to over-
heating.
Never operate the boat with the motor
trimmed beyond the maximum trim position.
22
Make a test run in the boat to determine if the
trim angle needs to be adjusted. Adjust the trim
angle using the Power Trim and Tilt system.
Refer to the POWER TRIM AND TILT section.
While operating your boat with the motor
adjusted to the proper trim angle, observe the
position of the needle on the TRIM GAUGE pro-
vided as optional part. When making future trim
angle adjustment, use the TRIM GAUGE as a
guide.
(Optional part)