Installation; Mounting The Outboard Motor - Yamaha FL250G Owner's Manual

Installation

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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 motor combination. Proper
mounting depends in part on experience and
the specific boat and motor combination.
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WARNING
Overpowering a boat could cause se-
G
vere instability. Do not install 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-
G
tor could result in hazardous conditions
such as poor handling, loss of control,
or fire hazards. For permanently mount-
ed models, your dealer or other person
experienced in proper rigging should
mount the motor.
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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. For single-engine
boats, mount the outboard motor on the cen-
terline (keel line) of the boat. For twin engine
boats, mount the outboard motors equidistant
from the centerline. Consult your Yamaha
dealer or boat manufacturer for further infor-
mation on determining the proper mounting
location.
34
1. Center line (keel line)
1. Center line (keel line)
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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 ex-
cessive propeller slip, and the water intakes
for the cooling system may not get adequate
water supply, which can cause engine over-
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
1
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