Yamaha 70 Owner's Manual page 44

Operation
4. Push the tilt support knob into the clamp
bracket or pull the tilt support lever to-
ward you to support the engine.
39
EWM00260
After tilting the outboard motor, be sure
to support it with the tilt support knob or
tilt support lever. Otherwise the outboard
motor could fall back down suddenly if oil
in the power trim and tilt unit loses pres-
sure.
5.
ECM00250
UP
Be sure to retract the trim rods complete-
ly during mooring. This protects the rods
from marine growth and corrosion which
could damage the power trim and tilt
ZMU03837
mechanism.
WARNING
Models equipped with trim rods: Once
the outboard motor is supported with the
tilt support lever, press the power trim
and tilt switch / power tilt switch "
(down) to retract the trim rods.
CAUTION:
ZMU02528
"
ZMU02546