Battery Requirements; Battery Specifications; Mounting Battery; Multiple Batteries - Yamaha F250B Owner's Manual

This digital electronic control unit is only avail-
able for the outboard motor which you have
purchased.
Prior to use of the digital electronic control
unit, set it in order to operate your outboard
motor only. Otherwise, it will not be possible to
operate the outboard motor.
Perform setting of the outboard motor and the
digital electronic control unit in the following
cases.
If a used outboard motor is installed
G
If the digital electronic control unit is re-
G
placed
If the ECM (Electronic control module) of
G
the used outboard motor is replaced
If the ECM (Electronic control module) of
G
the digital electronic control unit is replaced
Consult your Yamaha dealer for setting.
EMU25694

Battery requirements

EMU25721

Battery specifications

Minimum cold cranking amps (CCA/EN):
711.0 A
Minimum rated capacity (20HR/IEC):
100.0 Ah
The engine cannot be started if battery volt-
age is too low.
EMU36290

Mounting battery

Mount the battery holder securely in a dry,
well-ventilated, vibration-free location in the
boat. WARNING! Do not put flammable
items, or loose heavy or metal objects in
the same compartment as the battery.
Fire, explosion or sparks could result.
[EWM01820]
Specifications and requirements
EMU36300

Multiple batteries

To connect multiple batteries, such as for mul-
tiple engine configurations or for an accessory
battery, consult your Yamaha dealer about
battery selection and correct wiring.
EMU34194
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-
load. Generally, select a larger pitch propeller
for a smaller operating load and a smaller
pitch propeller for a heavier load. If you carry
loads that vary widely, select the propeller that
lets the engine run in the proper range for your
maximum load but remember that you may
need to reduce your throttle setting to stay
within the recommended engine speed range
when carrying lighter loads.
To check the propeller, see page 78.

Propeller selection

11