Page 63 of 96

1. Floorboard mat
4. Open the reservoir cap, and then
add coolant to the maximum
level mark. WARNING! Remove
only the coolant reservoir cap.
Never attempt to remove the
radiator cap when the engine is
hot.
[EWA15161]
NOTICE: If coolant is not avai-
lable, use distilled water or soft
tap water instead. Do not use
hard water or salt water since it
is harmful to the engine. If
water has been used instead of
coolant, replace it with coolant
as soon as possible, otherwise
the cooling system will not be
protected against frost andcorrosion. If water has been
added to the coolant, have a
Yamaha dealer check the anti-
freeze content of the coolant
as soon as possible, otherwise
the effectiveness of the coolant
will be reduced.
[ECA10472]
1. Coolant reservoir cap
5. Close the reservoir cap
6. Place the floorboard mat in the
original position and push it
downward to secure it.
EAU33031
Changing the coolant
The coolant must be changed at the
intervals specified in the periodic
maintenance and lubrication chart.
Have a Yamaha dealer change the
coolant. WARNING! Never attempt
to remove the radiator cap when
the engine is hot.
[EWA10381]
Coolant reservoir capacity:
0.25 L (0.26 US qt, 0.22 Imp.qt)
PERIODIC MAINTENANCE AND ADJUSTMENT
6-15
6
Page 76 of 96

EAUS1870
Replacing the fuses
The fuse box, which contains the
fuses for the individual circuits, is
located behind cowling A. (See page
6-8).
TIP
The main fuse, which is in a different
and hard-to-reach location, must be
replaced by a Yamaha dealer.
If a fuse for the individual circuits is
blown, replace it as follows.
1. Turn the key to “OFF” and turn off
the electrical circuit in question.
2. Remove the blown fuse, and then
install a new fuse of the specified
amperage. WARNING! Do not
use a fuse of a higher ampera-
ge rating than recommended
to avoid causing extensive
damage to the electrical sys-
tem and possibly a fire.
[EWA15131]
TIP
Fuse tongs and a bag containing spa-
re fuses are included in the owner’s
tool kit. Use the tongs to remove and
install a fuse.
For YP125R
1. Fuse box
2. Hazard fuse
For YP125RA
1. ABS fuse
2. ABS fuse box
3. Fuse box
4. Hazard fuse
Fuse box
1. Radiator fan fuse
2. ECU fuse
3. Backup fuse
4. Signaling system fuse
5. Headlight fuse
6. Ignition fuse
7. Spare fuse
8. Hazard fuse
PERIODIC MAINTENANCE AND ADJUSTMENT
6-28
6
Page 77 of 96
ABS fuse box
1. ABS motor fuse
2. ABS motor spare fuse
3. ABS solenoid fuse
4. ABS control unit fuse
3. Turn the key to “ON” and turn on
the electrical circuit in question to
check if the device operates.
4. If the fuse immediately blows
again, have a Yamaha dealer
check the electrical system.
EAU34240
Replacing a headlight bulb
This model is equipped with quartz
bulb headlights. If a headlight bulb
burns out, have a Yamaha dealer
replace it and, if necessary, adjust the
headlight beam.
Specified fuses:
Main fuse:
30.0 A
Headlight fuse:
15.0 A
Signaling system fuse:
10.0 A
Ignition fuse:
10.0 A
Radiator fan fuse:
7.5 A
Hazard fuse:
10.0 A
ECU fuse:
5.0 A
ABS control unit fuse (for ABS
models):
5.0 A
ABS motor fuse (for ABS
models):
30.0 A
ABS solenoid fuse (for ABS
models):
20.0 A
Backup fuse:
5.0 A
PERIODIC MAINTENANCE AND ADJUSTMENT
6-29
6
Page 82 of 96

Engine overheatingEWA10400
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 counterclockwise to the detent to allow any residual pressure to escape. When the his-
sing 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.
The coolant level
is OK.
The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer checkand repair the cooling system.
Add coolant. (See TIP.)
Start the engine. If the engine overheats again, have a
Yamaha dealer check and repair the cooling system.
There is
leakage.
There is
no leakage.
WARNING
PERIODIC MAINTENANCE AND ADJUSTMENT
6-34
6
Page 87 of 96

Dimensions:Overall length:
YP125R 2201 mm (86.7 in)
YP125RA 2201 mm (86.7 in)
YP125R Sport 2201 mm (86.7 in)
YP125RA Business 2290 mm (90.2 in)
Overall width:
776 mm (30.6 in)
Overall height:
YP125R 1337 mm (52.6 in)
YP125RA 1337 mm (52.6 in)
YP125R Sport 1186 mm (46.7 in)
YP125RA Business 1378 mm (54.3 in)
Seat height:
792 mm (31.2 in)
Wheelbase:
1535 mm (60.4 in)
Ground clearance:
135 mm (5.31 in)
Minimum turning radius:
1805 mm (71.1 in)
Weight:With oil and fuel:
YP125R 173 Kg (381 lb)
YP125RA 176 Kg (388 lb)
YP125R Sport 174.5 Kg (385 lb)
YP125RA Business 183.2 Kg (404 lb)
Engine:Engine type:
Liquid cooled 4-stroke, SOHC
Cylinder arrangement:
Forward-inclined single cylinderDisplacement:
124 cm
3
Bore x stroke:
52.0 x 58.6 mm (2.05 x 2.31 in)
Compression ratio:
11.20 :1
Starting system:
Electric starter
Lubrication system:
Wet sump
Engine oil:Recommended brand:
YAMALUBE
Type:
SAE 10W-30, SAE 10W-40, SAE 15W-40,
SAE 20W-40 or SAE 20W-50
Recommended engine oil grade:
API service SG type or higher, JASO stan-
dard 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)
Cooling system:Coolant reservoir capacity (up to the maxi-
mum level mark):
0.25 L (0.26 US qt, 0.22 Imp.qt)
Radiator capacity (including all routes):
1.00 L (1.06 US qt, 0.88 Imp.qt)
Air filter:Air filter element:
Oil-coated paper element
Fuel:Recommended fuel:
Regular unleaded gasoline only
Fuel tank capacity:
11.8 L (3.12 US gal, 2.60 Imp.gal)
Fuel reserve amount:
2.0 L (0.53 US gal, 0.44 Imp.gal)
Spark plug(s):Manufacturer/model:
NGK/CPR9EA-9
-20 -10 0
10 20 30
40
50 ˚C
SAE 10W-30
SAE 15W-40
SAE 20W-40
SAE 20W-50
SAE 10W-40
SAE 10W-50
SPECIFICATIONS
8-1
8
Page 89 of 96

Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
95.0 mm (3.74 in)
Electrical system:Ignition system:
TCI
Charging system:
AC magneto
Battery:Model:
GTX9-BS
Voltage, capacity:
12 V, 8.0 Ah
Headlight:Bulb type:
Halogen bulb
Bulb voltage, wattage x quantity:Low beam headlight:
12 V, 55.0 W x 1
High beam headlight:
12 V, 55.0 W x 1
Tail/brake light:
12 V, 5.0 W/21.0 W x 2
Front turn signal light:
12 V, 10.0 W x 2
Rear turn signal light:
12 V, 10.0 W x 2
Auxiliary light:
12 V, 5.0 W x 2
License plate light:
12 V, 5.0 W x 1
Meter lighting:
12 V, 2.0 W x 3High beam indicator light:
12 V, 1.4 W x 1
Turn signal indicator light:
12 V, 1.4 W x 2
Engine trouble warning light:
12 V, 1.4 W x 1
ABS warning light (for ABS models):
12 V, 1.4 W x 1
Immobilizer system indicator light:
LED
Fuses:Main fuse:
30.0 A
Headlight fuse:
15.0 A
Signaling system fuse:
10.0 A
Ignition fuse:
10.0 A
Radiator fan fuse:
7.5 A
Hazard fuse:
10.0 A
ECU fuse:
5.0 A
ABS control unit fuse (for ABS models):
5.0 A
ABS motor fuse (for ABS models):
30.0 A
ABS solenoid fuse (for ABS models):
20.0 A
Backup fuse:
5.0 A
SPECIFICATIONS
8-3
8