Page 63 of 96

PERIODIC MAINTENANCE AND ADJUSTMENT
6-15
6 3. If the coolant is at or below the
minimum level mark, lift up the
right floorboard mat as shown.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
available, 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 cool-
ant as soon as possible, other-
wise the cooling system will not
be protected against frost and
corrosion. 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]
5. Close the reservoir cap
6. Place the floorboard mat in the
original position and push it down-
ward to secure it.
EAU33031
Changing the coolant
The coolant must be changed at the in-
tervals specified in the periodic mainte-
nance and lubrication chart. Have a
Yamaha dealer change the coolant.
WARNING! Never attempt to remove
the radiator cap when the engine is
hot.
[EWA10381]
1. Maximum level mark
2. Minimum level mark
3. Coolant level check window
1. Floorboard mat
1. Coolant reservoir cap
Coolant reservoir capacity:
0.25 L (0.26 US qt, 0.22 Imp.qt)
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Page 77 of 96

PERIODIC MAINTENANCE AND ADJUSTMENT
6-29
6
EAUS1870
Replacing the fuses The fuse box, which contains the fuses
for the individual circuits, is located be-
hind cowling A. (See page 6-8.)TIPThe main fuse, which is in a different
and hard-to-reach location, must be re-
placed 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 amperage
rating than recommended to
avoid causing extensive dam-
age to the electrical system and
possibly a fire.
[EWA15131]
TIPFuse tongs and a bag containing spare
fuses are included in the owner’s tool
kit. Use the tongs to remove and install
a fuse.
For YP125R
For YP125RAFor YP125R-RA1. Fuse box
2. Hazard fuse
1. ABS fuse
2. Fuse box
3. Fuse box
4. Hazard fuse
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
7
1
2
3
4
5
6
.
U2ABE2E0.book Page 29 Thursday, August 30, 2012 2:36 PM
Page 78 of 96
PERIODIC MAINTENANCE AND ADJUSTMENT
6-30
6For YP125RA
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.
EAU34241
Replacing a headlight bulb This model is equipped with halogen
bulb headlights. If a headlight bulb
burns out, have a Yamaha dealer re-
place it and, if necessary, adjust the
headlight beam.
1. ABS motor fuse
2. ABS motor spare fuse
3. ABS solenoid fuse
4. ABS control unit fuse
1
23
3
2
4
3
Specified fuses:
Main fuse:
30.0 A
Ignition fuse:
10.0 A
Signaling system fuse:
10.0 A
Headlight fuse:
15.0 A
Hazard fuse:
10.0 A
Radiator fan fuse:
7.5 A
ABS control unit fuse:
YP125RA 5.0 A
ABS motor fuse:
YP125RA 30.0 A
Backup fuse:
5.0 A
U2ABE2E0.book Page 30 Thursday, August 30, 2012 2:36 PM
Page 84 of 96

PERIODIC MAINTENANCE AND ADJUSTMENT
6-36
6Engine overheating
WARNING
EWA10400
●
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 hissing
sound has stopped, press down on the cap while turning it counterclockwise, and then remove the cap.
TIPIf 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.
U2ABE2E0.book Page 36 Thursday, August 30, 2012 2:36 PM
Page 89 of 96

SPECIFICATIONS
8-1
8
Dimensions:Overall length:
YP125R 2201 mm (86.7 in)
YP125RA 2201 mm (86.7 in)
YP125R Sport 2201 mm (86.7 in)
YP125RA Business 2370 mm (93.3 in)
Overall width:
776 mm (30.6 in)
Overall height:
YP125R 1214 mm (47.8 in)
YP125RA 1337 mm (52.6 in)
YP125R Sport 1337 mm (52.6 in)
YP125RA Business 1387 mm (54.6 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:Curb weight:
YP125R 174 kg (385 lb)
YP125RA 183 kg (403 lb)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:
11.20 : 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-50
Recommended 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)Cooling system:Coolant reservoir capacity (up to the
maximum 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 elementFuel:Recommended fuel:
Premium 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)Fuel injection:Throttle body:
ID mark:
1B91 00Spark plug(s):Manufacturer/model:
NGK/CPR9EA-9
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)Clutch:Clutch type:
Dry, centrifugal automatic
-20 -10 0
10 20 30
40
50 ˚C
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40SAE 10W-50
U2ABE2E0.book Page 1 Thursday, August 30, 2012 2:36 PM
Page 91 of 96

SPECIFICATIONS
8-3
8
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
95.0 mm (3.74 in)Electrical system:Ignition system:
TCI
Charging system:
AC magnetoBattery:Model:
GTX9-BS
Voltage, capacity:
12 V, 8.0 AhHeadlight:Bulb type:
Halogen bulbBulb voltage, wattage × quantity:Low beam headlight:
12 V, 55.0 W × 1
High beam headlight:
12 V, 55.0 W × 1
Tail/brake light:
12 V, 5.0 W/21.0 W × 2
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
License plate light:
12 V, 5.0 W × 1
Meter lighting:
12 V, 2.0 W × 3High beam indicator light:
12 V, 1.4 W × 1
Turn signal indicator light:
12 V, 1.4 W × 2
Engine trouble warning light:
12 V, 1.4 W x 1
ABS warning light:
YP125RA 12 V, 1.4 W × 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:
YP125RA 5.0 A
ABS motor fuse:
YP125RA 30.0 A
Backup fuse:
5.0 A
U2ABE2E0.book Page 3 Thursday, August 30, 2012 2:36 PM