Specifications and requirements
14
Tightening torque for engine:
Spark plug:
F2.5AMH 25.0 Nm (2.55 kgf-m,
18.4 ft-lb)
F4BMH 13.0 Nm (1.33 kgf-m, 9.6 ft-lb)
F5AMH 13.0 Nm (1.33 kgf-m, 9.6 ft-lb)
F6CMH 13.0 Nm (1.33 kgf-m, 9.6 ft-lb)
Engine oil drain bolt:
18.0 Nm (1.84 kgf-m, 13.3 ft-lb)
Noise and vibration level:
Operator sound pressure level (ICOMIA
39/94 and 40/94):
F4BMH 77.5 dB(A) (*EC1)
F5AMH 77.5 dB(A) (*EC1)
F6CMH 77.5 dB(A) (*EC1)(*EC2)
Vibration on tiller handle (ICOMIA 38/94):
F4BMH 5.5 m/s² (*EC1)
F5AMH 5.5 m/s² (*EC1)
F6CMH 5.5 m/s² (*EC1)(*EC2)
EMU33554
Installation requirements
EMU33564
Boat horsepower rating
WARNING
EWM01560
Overpowering a boat can cause severe in-
stability.
Before installing the outboard motor(s), con-
firm that the total horsepower of your out-
board motor(s) does not exceed the boats
maximum horsepower rating. See the boat’s
capacity plate or contact the manufacturer.
EMU43000
Mounting the outboard motor
F2.5A
WARNING
EWM01570
●
Improper mounting of the outboard mo-
tor could result in hazardous conditions
such as poor handling, loss of control,
or fire hazards.
●
Because the motor is very heavy, spe-
cial equipment and training is required
to mount it safely.
Your dealer or other person experienced in
proper rigging should mount the motor using
correct equipment and complete rigging in-
structions. For further information, see page
31.
F4B, F5A, F6C
WARNING
EWM02430
Improper mounting of the outboard motor
could result in hazardous conditions,
such as poor handling, loss of control, or
fire hazards. If you are not able to mount
the outboard motor properly, consult a
Yamaha dealer.
To lift and mount the outboard motor, two
people are necessary. For further information,
see page 31.
EMU34195
Propeller selection
Next to selecting an outboard motor, selecting
the right propeller is one of the most important
purchasing decisions a boater can make. The
type, size, and design of your propeller have
a direct impact on acceleration, top speed,
fuel economy, and even engine life. Yamaha
designs and manufactures propellers for ev-
ery Yamaha outboard motor and every appli-
cation.
Your outboard motor came with a Yamaha
propeller selected to perform well over a
range of applications, but there may be uses
where a different propeller would be more ap-
propriate.
Your Yamaha dealer can help you select the
right propeller for your boating needs. Select
a propeller that will allow the engine to reach
the middle or upper half of the operating
range at full throttle with the maximum boat-
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