2000 YAMAHA SR125 warning light

3-1
3
EAU00027
3-INSTRUMENT AND CONTROL FUNCTIONS
EAU00029*
Main switch/steering lockThe main switch controls the ignition
and lighting systems. Its operation is
described below.
EAU00036
ON
Electrical circuits are switched on. The
engine can be started. The key cannot
be removed in this position.
EAU00038
OFF
All electrical circuits are switched off.
The key can be removed in this posi-
tion.
EAU00040
LOCK
The steering is locked in this position
and all electrical circuits are switched
off. The key can be removed in this po-
sition.
To lock the steering, turn the handle-
bars all the way to the left. While push-
ing the key into the main switch, turn it
from “OFF” to “LOCK” and remove it.
To release the lock, turn the key to
“OFF” while pushing.
EW000016
WARNING
@ Never turn the key to “OFF” or
“LOCK” when the motorcycle is
moving. The electrical circuits will
be switched off which may result in
loss of control or an accident. Be
sure the motorcycle is stopped be-
fore turning the key to “OFF” or
“LOCK”. @1. Push
2. Turn
E_3mw.book Page 1 Monday, February 5, 2001 9:54 AM

PRE-OPERATION CHECKS
4-2
4
NOTE:Pre-operation checks should be made each time the motorcycle is used. Such an inspection can be thoroughly accom-
plished in a very short time; and the added safety it assures is more than worth the time involved.
WARNING
If any item in the PRE-OPERATION CHECK is not working properly, have it inspected and repaired before operating
the motorcycle.Center and sidestand
pivot• Check for smooth operation.
• Lubricate if necessary.6-24
Chassis fasteners• Make sure that all nuts, bolts and screws are properly tightened.
• Tighten if necessary.—
Fuel• Check fuel level.
• Fill with fuel if necessary.3-5 ~ 3-6
Lights, signals and
switches• Check for proper operation. 6-29 ~ 6-30
Battery• Check fluid level.
• Fill with distilled water if necessary.6-26 ~ 6-28 ITEM CHECKS PAGEE_3mw.book Page 2 Monday, February 5, 2001 9:54 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-18
6Free play
The free play at the end of the brake
pedal should be approximately 20 ~
30 mm. Turn the adjusting nut in direc-
tion
a to increase the brake pedal free
play or in direction
b to reduce the
brake pedal free play.
EW000103
WARNING
@ Check the operation of the brake
light after adjusting the rear brake. @
EAU01646
Brake light switch adjustmentThe rear brake light switch is activated
by the brake pedal and is properly ad-
justed when the brake light comes on
just before braking takes effect. Adjust
the brake light switch as follows.
1. Remove panel A.
2. Remove the battery cover by re-
moving the screw.3. Hold the switch body so it does not
rotate while turning the adjusting
nut.
4. Turn the adjusting nut in
direction
a to make the brake
light come on earlier. Turn the ad-
justing nut in direction
b to make
the brake light come on later.
1. Adjusting nut
1. Battery cover
2. Screw
1. Brake light switch
2. Adjusting nut
E_3mw.book Page 18 Monday, February 5, 2001 9:54 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-22
6
EAU01533
Drive chain slack adjustment1. Loosen the rear brake adjusting
nut.
2. Loosen the wheel axle nut.3. To tighten the chain, turn the chain
adjusting plates in direction
a.
To loosen the chain, turn the chain
adjusting plates in direction
b and
push the wheel forward. Turn each
chain adjusting plate to exactly the
same position to maintain correct
axle alignment.
EC000096
CAUTION:@ Too little chain slack will overload
the engine and other vital parts.
Keep the slack within the specified
limits. @
4. Tighten the wheel axle nut to the
specified torque.
5. Adjust the brake pedal free play.
EW000103
WARNING
@ Check the operation of the brake
light after adjusting the rear brake. @
1. Adjusting nut
1. Axle nut
2. Chain adjusting plate
Tightening torque:
Wheel axle nut:
65 Nm (6.5 m·kg)
E_3mw.book Page 22 Monday, February 5, 2001 9:54 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-29
6
EAU03003
Headlight bulb replacementThis motorcycle is equipped with a
quartz bulb headlight.
If the headlight bulb burns out, replace
the bulb as follows:
1. Remove the headlight unit screws.
2. Remove the connector, the head-
light unit and then the bulb holder
cover.3. Turn the bulb holder counterclock-
wise to remove it and remove the
defective bulb.
EWA00023
WARNING
@ Keep flammable products and your
hands away from the bulb while it is
on, as it is hot. Do not touch the bulb
until it cools down. @4. Put a new bulb into position and
secure it in place with the bulb
holder.
ECA00040
CAUTION:@ Avoid touching the glass part of the
bulb. Keep it free from oil; other-
wise, the transparency of the glass,
life of the bulb, and luminous flux
will be adversely affected. If oil gets
on the bulb, thoroughly clean it with
a cloth moistened with alcohol or
lacquer thinner. @5. Install the bulb holder cover, con-
nector and headlight unit.
Ask a Yamaha dealer to adjust the
headlight beam if that adjustment
is necessary.
1. Screw (´ 2)
2. Bulb holder cover
1. Bulb holder
1. Don’t touch
E_3mw.book Page 29 Monday, February 5, 2001 9:54 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-30
6
EAU00855*
Turn signal and tail/brake light
bulb replacement1. Remove the screws and the lens.
2. Push the bulb inward and turn it
counterclockwise.3. Place a new bulb in the socket.
Push the bulb inward and turn it
clockwise until it engages into the
socket.
4. Install the lens and the screws.
EC000108
CAUTION:@ Do not over-tighten the screws as
the lens may break. @
EAU00866
Front wheel removal
EW000122
WARNING
@ l
It is advisable to have a Yamaha
dealer service the wheel.
l
Securely support the motor-
cycle so there is no danger of it
falling over.
@1. Place the motorcycle on the cen-
terstand.
2. Remove the speedometer cable
from the front wheel side.
1. Screw (´ 2)
1. Screw
1. Speedometer cable
E_3mw.book Page 30 Monday, February 5, 2001 9:54 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-33
6
EAU01723*
Rear wheel installation1. Install the rear wheel and the axle.
2. Install the axle nut and let the
motorcycle down.
3. Insert the brake rod into the brake
cam lever and install the brake
pedal free play adjusting nut.
4. Install the brake torque rod bolt
and tighten to the specified tight-
ening torque. Then install a new
cotter pin.
5. Adjust the drive chain free play.
(See page 6-22.)
6. Tighten the axle nut to the speci-
fied tightening torque.7. Adjust the rear brake pedal height
and free play. (See page 6-17.)
EW000103
WARNING
@ Check the operation of the brake
light after adjusting the rear brake. @
EAU01008
TroubleshootingAlthough Yamaha motorcycles receive
a rigid inspection before shipment from
the factory, trouble may occur during
operation.
Any problem in the fuel, compression,
or ignition systems can cause poor
starting and loss of power. The trouble-
shooting chart describes a quick, easy
procedure for making checks.
If your motorcycle requires any repair,
bring it to a Yamaha dealer. The skilled
technicians at a Yamaha dealership
have the tools, experience, and know-
how to properly service your motor-
cycle. Use only genuine Yamaha parts
on your motorcycle. Imitation parts may
look like Yamaha parts, but they are of-
ten inferior. Consequently, they have a
shorter service life and can lead to ex-
pensive repair bills. Specified torque:
Brake torque rod bolt:
25 Nm (2.5 m·kg)
Specified torque:
Axle nut:
65 Nm (6.5 m·kg)
E_3mw.book Page 33 Monday, February 5, 2001 9:54 AM