Mount the outboard motor on the center
line (keel line) of the boat, and ensure that
the boat itself is well balanced. Otherwise,
the boat will be hard to steer. For boats
without a keel or which are asymmetrical,
consult your dealer.
1
Center line (keel line)
3-3
E
EMU01566
Mounting Height
To run your boat at optimum efficiency,
the water-resistance (drag) of the boat
and outboard motor must be made as lit-
tle as possible. 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 causing the
engine to overheat. If the mounting
height is too low, the water-resistance will
increase and thereby reduce engine effi-
ciency. Mount the engine so the anti-cavi-
tation plate is about 130 mm (5 in.) above
the bottom of the boat.
NOTE:
8
The optimum mounting height of the
outboard motor is affected by the
boat/motor combination. Test runs at
different heights can help determine the
optimum mounting height.
For further details, consult your
Yamaha dealer or boat manufacture to
determine the proper mounting height.
8
Refer to the section “TRIMMING OUT-
BOARD MOTOR” for instructions on
setting the trim angle of the outboard.
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