Tilting Up And Down - Yamaha F4B Owner's Manual

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.
EMU39592

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 case from damage due to colli-
sions with obstructions, and also to reduce
salt corrosion.
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.
EWM02312
WARNING
Leaking fuel is a fire hazard. When the out-
board motor will be tilted up for more than
a few minutes, tighten the air vent screw
and fuel tank cap and align the fuel cock
with the closed position. Otherwise, fuel
may leak.
ECM02161
NOTICE
Before tilting the outboard motor up, fol-
G
low the procedure under "Stopping en-
gine" in this chapter. Never tilt the
outboard motor up while the engine is
running. Severe damage from overheat-
ing can result.
Do not tilt the outboard motor up by
G
pushing the tiller handle because this
could break the handle.
Operation
ZMU06840
38