2017 YAMAHA YZF-R125 lock

Periodic maintenance and adjustment
6-26
6
EAU22762
Drive chain slack
The drive chain slack should be
checked before each ride and adjusted
if necessary.
EAUM3551To check the drive chain slack
1. Place the motorcycle on the side-
stand.
TIP
When checking and adjusting the drive
chain slack, there should be no weight
on the motorcycle.
2. Shift the transmission into the
neutral position.
3. Measure the drive chain slack at
the arrow mark on the swingarm
as shown in the illustration.
4. If the drive chain slack is incorrect,
adjust it as follows.
EAU3431ATo adjust the drive chain slack
Consult a Yamaha dealer before ad-
justing the drive chain slack.
1. Loosen the axle nut and the lock-
nut on each side of the swingarm.2. To tighten the drive chain, turn the
drive chain slack adjusting bolt on
each side of the swingarm in di-
rection (a). To loosen the drive
chain, turn the adjusting bolt on
each side of the swingarm in di-
rection (b), and then push the rear
wheel forward. NOTICE: Improp-
er drive chain slack will over-
load the engine as well as other
vital parts of the motorcycle and
can lead to chain slippage or
breakage. To prevent this from
occurring, keep the drive chain
slack within the specified limits.
[ECA10572]
TIP
Using the alignment marks on each
side of the swingarm, make sure that
both drive chain pullers are in the same
position for proper wheel alignment.
3. Tighten the axle nut, then the lock-
nuts to their specified torques.
Drive chain slack:
35.0–45.0 mm (1.38–1.77 in)
1. Drive chain slack
ZAUM1182
1. Axle nut
2. Drive chain slack adjusting bolt
3. Locknut
4. Alignment marks
ZAUM1468
UBR6E0E0.book Page 26 Wednesday, August 17, 2016 1:26 PM

Periodic maintenance and adjustment
6-27
6 4. Make sure that the drive chain
pullers are in the same position,
the drive chain slack is correct,
and the drive chain moves
smoothly.
EAU23026
Cleaning and lubricating the
drive chain
The drive chain must be cleaned and
lubricated at the intervals specified in
the periodic maintenance and lubrica-
tion chart, otherwise it will quickly wear
out, especially when riding in dusty or
wet areas. Service the drive chain as
follows.
NOTICE
ECA10584
The drive chain must be lubricated
after washing the motorcycle, riding
in the rain or riding in wet areas.
1. Clean the drive chain with kero-
sene and a small soft brush.
NOTICE: To prevent damaging
the O-rings, do not clean the
drive chain with steam cleaners,
high-pressure washers or inap-
propriate solvents.
[ECA11122]
2. Wipe the drive chain dry.
3. Thoroughly lubricate the drive
chain with a special O-ring chain
lubricant. NOTICE: Do not use
engine oil or any other lubri-
cants for the drive chain, as they
may contain substances that
could damage the O-rings.
[ECA11112]
Tightening torques:
Axle nut:
85 Nm (8.5 m·kgf, 61 ft·lbf)
Locknut:
16 Nm (1.6 m·kgf, 12 ft·lbf)
UBR6E0E0.book Page 27 Wednesday, August 17, 2016 1:26 PM

Periodic maintenance and adjustment
6-36
6
EAU24182
Tail/brake light
This model is equipped with an LED-
type tail/brake light.
If the tail/brake light does not come on,
have a Yamaha dealer check it.
EAU24205
Replacing a turn signal light
bulb
1. Remove the turn signal light lens
by removing the screw.
2. Remove the burnt-out bulb by
pushing it in and turning it coun-
terclockwise.
3. Insert a new bulb into the socket,
push it in, and then turn it clock-
wise until it stops.
4. Install the lens by installing the
screw. NOTICE: Do not over-
tighten the screw, otherwise the
lens may break.
[ECA11192]
1. Screw
1. Turn signal light bulb
ZAUM1223
UBR6E0E0.book Page 36 Wednesday, August 17, 2016 1:26 PM

Periodic maintenance and adjustment
6-40
6Engine overheating
WARNING
EWA10401
Do not remove the radiator cap when the engine and radiator are hot.
Scalding hot fluid and steam may be blown out under pressure, which
could cause serious injury. Be sure to wait until the engine has cooled.
After removing the radiator cap retaining bolt, place a thick rag, like a
towel, over the radiator cap, and then slowly rotate the cap counter-
clockwise to the detent to allow any residual pressure to escape. When
the hissing sound has stopped, press down on the cap while turning it
counterclockwise, and then remove the cap.
TIP
If coolant is not available, tap water can be temporarily used instead, provided
that it is changed to the recommended coolant as soon as possible.
Wait until the engine
has cooled.
Check the coolant
level in the reservoir
and radiator.Add coolant.
(See TIP.)
The coolant level is
OK.
There is no leakage.
There is leakage.
The coolant level is
low.
Check the cooling
system for leakage.
Have a Yamaha
dealer check and
repair the cooling
system.
Start the engine. If the engine overheats again,
have a Yamaha dealer check and repair the cooling
system.
UBR6E0E0.book Page 40 Wednesday, August 17, 2016 1:26 PM

10-1
10
Index
A
ABS ...................................................... 3-15
ABS warning light ................................... 3-3
Air filter element and check hose,
replacing and cleaning ....................... 6-15
Auxiliary light bulb, replacing ............... 6-35
B
Battery .................................................. 6-32
Brake and clutch levers, checking and
lubricating .......................................... 6-29
Brake fluid, changing ........................... 6-25
Brake fluid level, checking ................... 6-24
Brake lever ........................................... 3-14
Brake light switches ............................. 6-23
Brake pedal .......................................... 3-15
Brake pedal, checking and
lubricating .......................................... 6-29
Brake pedal free play, adjusting........... 6-22
C
Cables, checking and lubricating ......... 6-28
Care ........................................................ 7-1
Catalytic converter ............................... 3-18
Clutch lever .......................................... 3-13
Clutch lever free play, adjusting ........... 6-21
Coolant ................................................. 6-14
Cowlings and panel, removing and
installing ............................................... 6-7
D
Data recording, vehicle .......................... 9-2
Diagnostic connectors ........................... 9-2
Dimmer switch ..................................... 3-12
Drive chain, cleaning and lubricating ... 6-27
Drive chain slack .................................. 6-26
E
Engine break-in ...................................... 5-4
Engine idling speed, checking ............. 6-16
Engine oil and oil filter element ............ 6-11
Engine stop switch ............................... 3-12
Engine trouble warning light................... 3-3
F
Front and rear brake pads, checking ... 6-23
Front brake lever free play, checking ... 6-22
Front fork, checking ............................. 6-31
Fuel....................................................... 3-17
Fuel consumption, tips for reducing ...... 5-4
Fuel level warning light ........................... 3-2
Fuel tank cap........................................ 3-16
Fuses, replacing ................................... 6-34
H
Handlebar switches.............................. 3-12Headlight bulb, replacing ...................... 6-35
High beam indicator light........................ 3-2
Horn switch........................................... 3-12
I
Identification numbers ............................ 9-1
Ignition circuit cut-off system ............... 3-20
Indicator lights and warning lights .......... 3-2
Info switch ............................................ 3-12
L
License plate light bulb, replacing ........ 6-37
M
Main switch/steering lock ....................... 3-1
Maintenance and lubrication, periodic ... 6-4
Maintenance, emission control
system .................................................. 6-3
Matte color, caution ................................ 7-1
Model label ............................................. 9-1
Multi-function meter unit ........................ 3-4
N
Neutral indicator light.............................. 3-2
P
Parking .................................................... 5-5
Part locations .......................................... 2-1
Pass switch........................................... 3-12
R
Rider seat.............................................. 3-19
S
Safety information................................... 1-1
Shifting .................................................... 5-3
Shift pedal............................................. 3-14
Sidestand .............................................. 3-20
Sidestand, checking and lubricating .... 6-30
Spark plug, checking .............................. 6-9
Specifications ......................................... 8-1
Starting the engine.................................. 5-2
Start switch ........................................... 3-12
Steering, checking ................................ 6-31
Storage ................................................... 7-4
Supporting the motorcycle ................... 6-37
Swingarm pivots, lubricating ................ 6-30
T
Tail/brake light ...................................... 6-36
Throttle grip and cable, checking and
lubricating ........................................... 6-28
Throttle grip free play, adjusting ........... 6-16
Tires ...................................................... 6-18
Tool kit .................................................... 6-2
Troubleshooting .................................... 6-38
Troubleshooting charts ......................... 6-39
Turn signal indicator light ....................... 3-2
UBR6E0E0.book Page 1 Wednesday, August 17, 2016 1:26 PM