Periodic maintenance and adjustment
6-10
6 To install the spark plug
1. Clean the surface of the spark
plug gasket and its mating sur-
face, and then wipe off any grime
from the spark plug threads.
2. Install the spark plug with the
spark plug wrench, and then tight-
en it to the specified torque.
TIP
If a torque wrench is not available
when installing a spark plug, a good
estimate of the correct torque is 1/4…
1/2 turn past finger tight. However, the
spark plug should be tightened to the
specified torque as soon as possible.
3. Install the spark plug cap.
4. Place the rear storage compart-
ment in the original position and
install the bolts.
5. Close the seat.
EAUM3332
Engine oil
The engine oil level should be checked
before each ride. In addition, the oil
must be changed at the intervals spec-
ified in the periodic maintenance and
lubrication chart and when the service
indicator light comes on.
To check the engine oil level
1. Place the scooter on the center-
stand. A slight tilt to the side can
result in a false reading.
2. Start the engine, warm it up for
several minutes, and then turn it
off.
3. Wait a few minutes until the oil set-
tles, remove the oil filler cap, wipe
the dipstick clean, insert it back
into the oil filler hole (without
screwing it in), and then remove it
again to check the oil level.
TIP
The engine oil should be between the
minimum and maximum level marks.
4. If the engine oil is below the mini-
mum level mark, add sufficient oil
of the recommended type to raise
it to the correct level.
1. Spark plug gap
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Tightening torque:
Spark plug:
12.5 Nm (1.25 m·kgf, 9.04 ft·lbf)
1
1. Engine oil filler cap
2. Maximum level mark
3. Minimum level mark
1
3
2
1
ZAUM0685
U2DME2E0.book Page 10 Tuesday, June 30, 2015 11:38 AM
Periodic maintenance and adjustment
6-12
6
TIP
Make sure that the O-ring is properly
seated.
10. Install the washer and the engine
oil drain bolt, and then tighten the
drain bolt to the specified torque.
TIP
Make sure that the washer is properly
seated.
11. Refill with the specified amount of
the recommended engine oil, and
then install and tighten the oil filler
cap.
TIP
Be sure to wipe off spilled oil on any
parts after the engine and exhaust sys-
tem have cooled down.
NOTICE
ECA11671
Do not use oils with a diesel
specification of “CD” or oils of a
higher quality than specified. Inaddition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.
Be sure no foreign material en-
ters the crankcase.
12. Start the engine, and then let it idle
for several minutes while checking
it for oil leakage. If oil is leaking,
immediately turn the engine off
and check for the cause.
13. Turn the engine off, and then
check the oil level and correct it if
necessary.
14. Reset the oil change indicator.
(See page 3-8.)
Tightening torque:
Oil filter cover bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Tightening torque:
Engine oil drain bolt:
20 Nm (2.0 m·kgf, 14 ft·lbf)
Recommended engine oil:
See page 8-1.
Oil change quantity:
Without oil filter element replace-
ment:
1.40 L (1.48 US qt, 1.23 Imp.qt)
With oil filter element replacement:
1.50 L (1.59 US qt, 1.32 Imp.qt)
U2DME2E0.book Page 12 Tuesday, June 30, 2015 11:38 AM
Periodic maintenance and adjustment
6-23
6Clean the filler cap before re-
moving. Use only DOT 4 brake
fluid from a sealed container.
Use only the specified brake flu-
id; otherwise, the rubber seals
may deteriorate, causing leak-
age.
Refill with the same type of
brake fluid. Adding a brake fluid
other than DOT 4 may result in a
harmful chemical reaction.
Be careful that water or dust
does not enter the brake fluid
reservoir when refilling. Water
will significantly lower the boil-
ing point of the fluid and may re-
sult in vapor lock, and dirt may
clog the ABS hydraulic unit
valves.
NOTICE
ECA17641
Brake fluid may damage painted
surfaces or plastic parts. Always
clean up spilled fluid immediately.
As the brake pads wear, it is normal for
the brake fluid level to gradually go
down. A low brake fluid level may indi-
cate worn brake pads and/or brake
system leakage; therefore, be sure to
check the brake pads for wear and the
brake system for leakage. If the brake
fluid level goes down suddenly, have a
Yamaha dealer check the cause before
further riding.
EAU22733
Changing the brake fluid
Have a Yamaha dealer change the
brake fluid at the intervals specified in
the periodic maintenance and lubrica-
tion chart. In addition, have the oil seals
of the master cylinders and calipers as
well as the brake hoses replaced at the
intervals listed below or whenever they
are damaged or leaking.
Oil seals: Replace every two
years.
Brake hoses: Replace every four
years.
U2DME2E0.book Page 23 Tuesday, June 30, 2015 11:38 AM
Periodic maintenance and adjustment
6-26
6
EAU23273
Checking the front fork
The condition and operation of the
front fork must be checked as follows
at the intervals specified in the periodic
maintenance and lubrication chart.
To check the condition
Check the inner tubes for scratches,
damage and excessive oil leakage.
To check the operation
1. Place the vehicle on a level sur-
face and hold it in an upright posi-
tion. WARNING! To avoid injury,
securely support the vehicle so
there is no danger of it falling
over.
[EWA10752]
2. While applying the front brake,
push down hard on the handle-
bars several times to check if the
front fork compresses and re-
bounds smoothly.
NOTICE
ECA10591
If any damage is found or the front
fork does not operate smoothly,
have a Yamaha dealer check or re-
pair it.
EAU45512
Checking the steering
Worn or loose steering bearings may
cause danger. Therefore, the operation
of the steering must be checked as fol-
lows at the intervals specified in the
periodic maintenance and lubrication
chart.
1. Place the vehicle on the center-
stand. WARNING! To avoid inju-
ry, securely support the vehicle
so there is no danger of it falling
over.
[EWA10752]
2. Hold the lower ends of the front
fork legs and try to move them for-
ward and backward. If any free
play can be felt, have a Yamaha
dealer check or repair the steer-
ing.
ZAUM1128
U2DME2E0.book Page 26 Tuesday, June 30, 2015 11:38 AM
Specifications
8-1
8
Dimensions:
Overall length:
2160 mm (85.0 in)
Overall width:
790 mm (31.1 in)
Overall height:
1385 mm (54.5 in)
Seat height:
785 mm (30.9 in)
Wheelbase:
1525 mm (60.0 in)
Ground clearance:
125 mm (4.92 in)
Minimum turning radius:
2500 mm (98.4 in)
Weight:
Curb weight:
169 kg (373 lb) (YP125R)
173 kg (381 lb) (YP125RA)
Engine:
Engine type:
Liquid cooled 4-stroke, SOHC
Cylinder arrangement:
Single cylinder
Displacement:
124 cm³
Bore × stroke:
52.0 × 58.6 mm (2.05 × 2.31 in)
Compression ratio:
11.2 : 1
Starting system:
Electric starter
Lubrication system:
Wet sump
Engine oil:
Recommended brand:
YAMALUBE
Type:
SAE 10W-30, 10W-40, 15W-40, 20W-40 or
20W-50Recommended engine oil grade:
API service SG type or higher, JASO
standard MA
Engine oil quantity:
Without oil filter element replacement:
1.40 L (1.48 US qt, 1.23 Imp.qt)
With oil filter element replacement:
1.50 L (1.59 US qt, 1.32 Imp.qt)
Final transmission oil:
Type:
YAMALUBE 10W-40 or SAE 10W-30 type
SE motor oil
Quantity:
0.21 L (0.22 US qt, 0.18 Imp.qt)
Coolant quantity:
Coolant reservoir (up to the maximum level
mark):
0.32 L (0.34 US qt, 0.28 Imp.qt)
Radiator (including all routes):
1.10 L (1.16 US qt, 0.97 Imp.qt)
Air filter:
Air filter element:
Oil-coated paper element
Fuel:
Recommended fuel:
Premium unleaded gasoline (Gasohol (E10)
acceptable)
Fuel tank capacity:
13.2 L (3.48 US gal, 2.90 Imp.gal)
Fuel reserve amount:
2.5 L (0.66 US gal, 0.55 Imp.gal)
Fuel injection:
Throttle body:
ID mark:
1B91 00
Spark plug(s):
Manufacturer/model:
NGK/CPR9EA-9
–20 –10 0
1020 30 40 50 C 10 30 50 70 90 110 0 130 F
SAE 10W-30
SAE 15W-40
SAE 20W-40
SAE 20W-50
SAE 10W-40
SAE 10W-50
U2DME2E0.book Page 1 Tuesday, June 30, 2015 11:38 AM
Specifications
8-3
8
Rear suspension:
Type:
Unit swing
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
84 mm (3.3 in)
Electrical system:
System voltage:
12 V
Ignition system:
TCI
Charging system:
AC magneto
Battery:
Model:
GT9B-4
Voltage, capacity:
12 V, 8.0 Ah
Headlight:
Bulb type:
Halogen bulb
Bulb voltage, wattage × quantity:
Headlight:
12 V, 55.0 W × 2
Brake/tail light:
LED
Front turn signal light:
12 V, 10.0 W × 2
Rear turn signal light:
12 V, 10.0 W × 2
Auxiliary light:
12 V, 5.0 W × 2 (YP125R,
YP125RA_CYP/GBR/GRC/IRL/SVN)
Auxiliary light:
LED (YP125RA_CYP/GRC/IRL/SVN)
License plate light:
12 V, 5.0 W × 1
Meter lighting:
LED
High beam indicator light:
LED
Turn signal indicator light:
LED
Fuel level warning light:
LED
Engine trouble warning light:
LED
ABS warning light:
LED (YP125RA)
Fuse:
Main fuse:
30.0 A
Headlight fuse:
20.0 A
Signaling system fuse:
10.0 A
Ignition fuse:
10.0 A
Radiator fan motor fuse:
7.5 A
Turn signal light and hazard fuse:
10.0 A
ECU fuse:
10.0 A
ABS control unit fuse:
10.0 A (YP125RA)
ABS motor fuse:
30.0 A (YP125RA)
ABS solenoid fuse:
20.0 A (YP125RA)
Backup fuse:
10.0 A
U2DME2E0.book Page 3 Tuesday, June 30, 2015 11:38 AM
10-1
10
Index
A
ABS (for ABS models) .......................... 3-16
ABS warning light (for ABS models)....... 3-4
Acceleration and deceleration................ 5-3
Air filter and V-belt case air filter
elements ............................................ 6-15
Auxiliary lights ...................................... 6-31
B
Battery .................................................. 6-27
Brake fluid, changing ........................... 6-23
Brake fluid level, checking ................... 6-22
Brake lever, front .................................. 3-15
Brake lever, rear ................................... 3-16
Brake levers, lubricating ....................... 6-25
Braking ................................................... 5-4
C
Cables, checking and lubricating ......... 6-24
Care ........................................................ 7-1
Catalytic converters ............................. 3-19
Centerstand and sidestand, checking
and lubricating ................................... 6-25
Coolant ................................................. 6-14
D
Dimmer switch ..................................... 3-14
E
Engine break-in ...................................... 5-5
Engine oil .............................................. 6-10
Engine trouble warning light................... 3-4
F
Final transmission oil ............................ 6-13
Front and rear brake lever free play,
checking............................................. 6-20
Front and rear brake pads, checking ... 6-21
Front fork, checking ............................. 6-26
Front turn signal light ........................... 6-32
Fuel....................................................... 3-18
Fuel consumption, tips for reducing ...... 5-5
Fuel level warning light ........................... 3-4
Fuel tank cap........................................ 3-17
Fuses, replacing ................................... 6-29
H
Handlebar switches.............................. 3-14
Hazard switch ...................................... 3-14
Headlight bulb, replacing ..................... 6-31
High beam indicator light ....................... 3-4
Horn switch .......................................... 3-14
I
Identification numbers............................ 9-1
Ignition circuit cut-off system............... 3-24
Immobilizer system ................................ 3-1Immobilizer system indicator light .......... 3-5
Indicator lights and warning lights .......... 3-4
Info switch ............................................ 3-15
L
License plate light bulb, replacing ........ 6-34
M
Main switch/steering lock ....................... 3-2
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 ........................ 3-6
P
Panels, removing and installing .............. 6-7
Parking .................................................... 5-6
Part locations .......................................... 2-1
Pass switch........................................... 3-14
S
Safe-riding points ................................... 1-5
Safety information................................... 1-1
Seat....................................................... 3-20
Shock absorber assemblies,
adjusting ............................................. 3-22
Sidestand .............................................. 3-23
Spark plug, checking .............................. 6-9
Specifications ......................................... 8-1
Starting off .............................................. 5-3
Starting the engine.................................. 5-2
Start switch ........................................... 3-14
Steering, checking ................................ 6-26
Storage ................................................... 7-4
Storage compartments ......................... 3-21
T
Tail/brake light ...................................... 6-32
Throttle grip and cable, checking and
lubricating ........................................... 6-24
Throttle grip free play, checking ........... 6-17
Tires ...................................................... 6-18
Tool kit .................................................... 6-2
Troubleshooting .................................... 6-34
Troubleshooting charts ......................... 6-35
Turn signal indicator lights ...................... 3-4
Turn signal light bulb (rear), replacing... 6-33
Turn signal switch ................................. 3-14
V
Valve clearance..................................... 6-17
Vehicle identification number ................. 9-1
W
Wheel bearings, checking..................... 6-27
U2DME2E0.book Page 1 Tuesday, June 30, 2015 11:38 AM