Yamaha F4B Owner's Manual page 27

5. Mount the outboard motor on the center
line (keel line) of the boat, and ensure
that the boat itself is well balanced. Oth-
erwise 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.
[EWM00721]
ZMU06835
1
ZMU01760
operator preference.
1. Steering friction adjuster
EMU39740
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
Installation
1
ZMU06834
1
2
ZMU06796
22