Yamaha F4 Manuel De L'utilisateur page 36

Installation
5. Mount the outboard motor on the center
line (keel line) of the boat, and ensure that
the boat itself is well balanced. Other-
wise the boat will be hard to steer. For
boats without a keel or which are asym-
metrical, consult your dealer.
1. Center line (keel line)
6. Turn the steering friction adjuster coun-
terclockwise to set the steering friction
according to
WARNING! If there is too much resis-
tance it could be difficult to steer,
which could result in an accident.
[EWM00722]
30
ZMU06835
1
ZMU01760
operator preference.
1. Steering friction adjuster
EMU39742
Mounting height
To run your boat at optimum efficiency, the
water resistance (drag) of the boat and out-
board motor must be made as little as possi-
ble. The mounting height of the outboard
motor greatly affects the water resistance. If
the mounting height is too high, cavitation
tends to occur, thus reducing the propulsion;
and if the propeller tips cut the air, the engine
speed will rise abnormally and cause the en-
gine to overheat. If the mounting height is too
low, the water resistance will increase and
thereby reduce engine efficiency. Mount the
outboard motor so that the anti-cavitation
plate is between the bottom of the boat and
a level 25 mm (1 in) below it.
0-25 mm
(0-1 in)
1. Idle hole
2. Anti-cavitation plate
1
ZMU06834
1
2
ZMU06796