Yamaha F250B Owner's Manual page 58

Installation
heating. If the engine is mounted too low, wa-
ter resistance (drag) will increase, thereby
reducing engine efficiency and performance.
Most commonly, outboard motor should be
mounted so that the anti-cavitation plate is in
alignment with the bottom of the boat. The op-
timum mounting height of the outboard motor
is affected by the boat/motor combination and
the desired use. Test runs at different heights
can help determine the optimum mounting
height. Consult your Yamaha dealer or boat
manufacturer for further information on deter-
mining the proper mounting height.
ECM01631
NOTICE
Check that the idle hole stays high
G
enough to keep out water getting inside
engine even if the boat is in stationary
with maximum load.
Incorrect engine height or obstructions
G
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 motor is operated contin-
uously in the presence of airborne water
spray, enough water could enter the en-
gine through the intake opening on the
52
cowling to cause severe engine dam-
age. Eliminate the cause of the airborne
water spray.
ZMU01762