49
Installation
EMU41213
Installation
The information presented in this section is
intended as reference only. It is not possible
to provide complete instructions for every
possible boat and outboard motor combina-
tion. Proper mounting depends in part on ex-
perience and the specific boat and outboard
motor combination.
WARNING
EWM02573
Overpowering a boat could cause se-
vere instability. Do not mount an out-
board motor with more horsepower
than the maximum rating on the capac-
ity 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 condi-
tions, such as poor handling, loss of
control, or fire hazards. Have your
Yamaha dealer mount the outboard mo-
tor properly.
EMU41271
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.
EMU41065
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
excessive propeller slip, and the cooling wa-
ter inlet for the cooling system may not get an
adequate water supply, which can cause en-
gine overheating. If the engine is mounted
too low, water resistance (drag) will increase,
thereby reducing engine efficiency and per-
formance.
The optimum mounting height depends on
the combination of the boat and outboard
motor. Consult your Yamaha dealer or boat
manufacturer for further information on de-
termining the proper mounting height.
NOTICE
ECM01635
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
airborne water spray while the boat is
1. Center line (keel line)
ZMU01760
1
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2019 Yamaha Motor Corporation, U.S.A.
