Yamaha YZ250FX 2021 Owner'S Service Manual Download Page 337

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ELECTRICAL COMPONENTS

8-50

a. Install a new fuse of the correct amperage

rating.

b. Push the start switch to verify if the electri-

cal circuit is operational.

c. If the fuse immediately blows again, check

the electrical circuit.

WARNING

EWA13310

Never use a fuse with an amperage rating

other than that specified. Improvising or us-

ing a fuse with the wrong amperage rating

may cause extensive damage to the electri-

cal system, cause the lighting and ignition

systems to malfunction and could possibly

cause a fire.

4. Install:

•

Seat
Refer to “GENERAL CHASSIS” on page 4-1.

EAM30291

CHECKING AND CHARGING THE BATTERY

WARNING

EWA20430

To avoid sparking, burns, fire, and explo-

sion:

• Charge battery only with specified charger.

• Use battery only for specified product – no

other use.

• Do not place near fire or immerse in water.

• Do not use battery if it has been dropped,

subject to impact, or visibly damaged.

• Do not disassemble or modify the battery,

or short across its terminals.

NOTICE

ECA26041

To prevent damage to the battery and battery

malfunction:

• Be sure to charge the battery using only the

specified battery charger. Do not use a

charger designed for lead-acid batteries.

Otherwise, the battery could be damaged,

such as from a long period of excessive

current or voltage exceeding 16 V.

• Avoid excessive current discharge, such

as pressing the starter switch for a long

time. Wait for more than 10 seconds before

attempting to start again. Charge the bat-

tery again as soon as possible. A long state

of discharge below 10 V will damage the

battery.

• Do not use the specified battery charger to

charge a battery other than the lithium-ion

battery. Otherwise, the battery or charger

could be damaged.

• Be careful not to drop the battery or subject

it to strong impacts.

• Avoid charging the battery at high temper-

atures of 65



C (149



F) or more or low tem-

peratures under 0



C (32



F). A control

feature preventing battery charging and

discharging will temporarily intervene. The

battery will discharge at 65



C (149



F) or

more or low temperatures under -10



C (14



F).

• If the battery is charged between 0



C (32



F)and 10



C (50



F), battery charging may

stop halfway without the battery becoming

fully charged even when the specified bat-

tery charger is used. If this occurs, discon-

nect the battery charger, and then resume

charging again.

TIP

This model uses a lithium-ion battery. When
new, the battery is supplied in sleep mode to
minimize current discharging until first-time use.
In the sleep mode, a voltage as low as approxi-
mately 0.1 V can be measured if voltage mea-
surement is performed. As such the battery
cannot be used, but this is not a malfunction. By
activating the battery as follows, the sleep mode
will be canceled and the battery can be used
normally.

Charging (activation) steps

1. Remove:

•

Side cover (left/right)

•

Seat
Refer to “GENERAL CHASSIS” on page 4-1.

2. Disconnect:

•

Battery lead
(from the battery terminals)

NOTICE

ECA13700

First, disconnect the negative battery lead,