Adjusting Boat Trim; Tilting Up And Down - Yamaha F2.5 Owner's Manual

Operation
EMU40121

Adjusting boat trim

Generally, a boat is stable when the keel line
of the boat is up about 3 to 5 degrees. With
the bow up, the boat may have a greater ten-
dency to steer to one side or the other. If this
occurs, adjust the trim angle.
Bow Up
Too much trim-out puts the bow of the boat
too high in the water. Excessive trim-out can
also cause the propeller to ventilate, which re-
duces performance further, and the boat may
"porpoise" (hop in the water), which could
throw the operator and passengers over-
board.
Bow Down
Too much trim-in causes the boat to "plow"
through the water, decreasing fuel economy
and making it hard to increase speed. Resis-
tance at the bow is greatly increased, height-
ening the danger of "bow steering" and
making operation difficult and dangerous.
64
EMU44132

Tilting up and down

If the engine will be stopped for some time or
if the boat is moored in shallows, the outboard
motor should be tilted up to protect the propel-
ler and lower casing from damage by collision
with obstructions, and also to reduce salt cor-
rosion.
EWM00222
WARNING
Make sure that no one is near the outboard
motor when tilting the outboard motor up
or down. Otherwise, body parts could be
crushed between the outboard motor and
the clamp bracket.