Yamaha T8C Owner's Manual page 63

E
2) Tilt the engine to the desired angle
using the power tilt switch.
NOTE:
@
Stay within the trim operating angle when
trimming the outboard motor using the
power tilt system.
@
To raise the bow ("trim-out"), tilt the engine
up.
To lower the bow ("trim-in"), tilt the engine
down.
Make test runs with the trim set to different
angles to find the position that works best for
your boat and operating conditions.
3-22