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)
HD26925
Mounting height
ZMU0176
0
ECM01634
NOTICE
Make sure that the idle hole is high
enough to prevent water from entering
the engine even if the boat is
stationary with the maximum load.
Incorrect engine height or
obstructions
to the smooth flow of water (such as the
design or condition of the boat, or ac-
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
cessories, such as transom ladders or
depth finder transducers) can create
airborne water spray while the boat is
cruising. If the outboard motor is oper-
ated continuously in the presence of
airborne water spray, enough water
could enter the engine through the air
intake opening in the top cowling to
cause severe engine damage. Remove
the cause of the airborne water spray.
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.
TIP:
The optimum mounting height of the
out- board motor is affected by the boat
and motor combination and the desired
use. Test runs at different heights can
help de- termine the optimum mounting
height. Consult your Hidea dealer or boat
man- ufacturer for further information on
deter- mining the proper mounting height.
For instructions on setting the trim
angle of the outboard motor, see page
57.
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