Yamaha F350 Owner's Manual page 69

1. Center line (keel line)
Consult your Yamaha dealer or boat manu-
facturer for further information on determin-
ing the proper mounting location.
EMU26934
Mounting height (boat bottom)
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 water in-
takes for the cooling system may not get ad-
equate water supply, which can cause
engine overheating. If the engine is mounted
too low, water resistance (drag) will increase,
thereby reducing engine efficiency and per-
formance.
Most commonly, outboard motor should be
mounted so that the anti-cavitation plate is in
alignment with the bottom of the boat. The
optimum mounting height of the outboard
motor is affected by the boat/motor combina-
tion and the desired use. Test runs at differ-
ent heights can help determine the optimum
mounting height. Consult your Yamaha deal-
er or boat manufacturer for further informa-
tion on determining the proper mounting
height.
1
ZMU07312
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-
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.
Installation
ZMU01762
63