Installation
39
gine overheating. If the engine is mounted too
low, water resistance (drag) will increase,
thereby reducing engine efficiency and per-
formance.
Most commonly, an 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 out-
board 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 fur-
ther information on determining the proper
mounting height.
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 air-
borne water spray while the boat is
cruising. If the outboard motor is oper-
ated 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. Idle hole
1
U6KNK0E0.book Page 39 Monday, November 7, 2022 10:23 AM
