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Installation
46
EMU41212
Installation
The information presented in this section is in-
tended as reference only. It is not possible to
provide complete instructions for every possi-
ble boat and outboard motor combination.
Proper mounting depends in part on experi-
ence and the specific boat and outboard mo-
tor combination.
WARNING
EWM02572
● Overpowering a boat could cause se-
vere instability. Do not mount an out-
board motor with more horsepower than
the maximum rating on the capacity
plate of the boat. If the boat does not
have a capacity plate, consult the boat
manufacturer.
● Improper mounting of the outboard mo-
tor could result in hazardous conditions,
such as poor handling, loss of control,
or fire hazards. Have your Yamaha deal-
er mount the outboard motor properly.
EMU41270
Mounting the outboard motor
The outboard motor should be mounted so
that the boat is well balanced. Otherwise, the
boat could be hard to steer. Mount the out-
board motor on the centerline (keel line) of the
boat.
EMU41063
Mounting height
The mounting height of your outboard motor
affects its efficiency and reliability. If it is
mounted too high, propeller ventilation may
occur, which will reduce propulsion due to ex-
cessive propeller slip, and the cooling water
inlet for the cooling system may not get ade-
quate water supply, which can cause engine
overheating. If the engine is mounted too low,
water resistance (drag) will increase, thereby
reducing engine efficiency and performance.
The optimum mounting height depends on
the combination of the boat and outboard mo-
tor. Consult your Yamaha dealer or boat man-
ufacturer for further information on
determining the proper mounting height.
NOTICE
ECM01634
● 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-
cessories, such as transom ladders or
depth finder transducers) can create air-
borne water spray while the boat is
cruising. If the outboard motor is operat-
ed continuously in the presence of air-
borne water spray, enough water could
enter the engine through the air intake
opening in the top cowling to cause se-
vere engine damage. Remove the cause
of the airborne water spray.
1. Center line (keel line)
ZMU01760
1
U6CB10E0.book Page 46 Wednesday, September 30, 2009 9:49 AM