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. Howe-
ver, the spark plug should be tighte-
ned to the specified torque as soon
as possible.
EAUS1701
Engine oil
The engine oil level should be chec-
ked before each ride. In addition, the
oil must be changed at the intervals
specified 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 centers-
tand. 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
settles, remove the oil filler cap,
wipe the dipstick clean, insert it
back into the oil filler hole (wit-
hout 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.
1. Engine oil filler cap
2. Maximum level mark
3. Minimum level mark
4. If the engine oil is below the mini-
mum level mark, add sufficient oil
of the recommended type to rai-
se it to the correct level.
5. Insert the dipstick into the oil filler
hole, and then tighten the oil filler
cap.
To change the engine oil (with or
without oil filter element
replacement)
1. Start the engine, warm it up for
several minutes, and then turn it
off.
2. Place an oil pan under the engine
to collect the used oil.
1
3
2
1
ZAUM0685
Tightening torque:
Spark plug:
PERIODIC MAINTENANCE AND ADJUSTMENT
6-10
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
system have cooled down.
ECA11670
Do not use oils with a diesel
specification of “CD” or oils of
a higher quality than specified.
In addition, do not use oils
labeled “ENERGY CONSER-
VING II” or higher.
Be sure no foreign material
enters 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 cau-
se.
13. Turn the engine off, and then
check the oil level and correct it if
necessary.
14. Reset the oil change indicator.
To reset the oil change indicator
1. Turn the key to “ON”.2. Hold the “OIL CHANGE” button
pushed for 15 to 20 seconds.
1. “OIL CHANGE” button
1. “OIL CHANGE” button
3. Release the “OIL CHANGE” but-
ton, and the oil change indicator
will go off.
NOTICE
Recommended engine oil:
See page 8-1
Oil change 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)
Tightening torque:
Engine oil drain bolt:
PERIODIC MAINTENANCE AND ADJUSTMENT
6-12
6
7. Refill with the specified amount
of the recommended final trans-
mission oil. WARNING! Make
sure that no foreign material
enters the final transmission
case. Make sure that no oil
gets on the tire or wheel.
[EWA11311]
8. Install the final transmission oil
filler cap and its new O-ring, and
then tighten the oil filler cap.
9. Check the final transmission case
for oil leakage. If oil is leaking,
check for the cause.
EAU20070
Coolant
The coolant level should be checked
before each ride. In addition, the coo-
lant must be changed at the intervals
specified in the periodic maintenance
and lubrication chart.
EAUS1670
To check the coolant level
1. Place the vehicle on a level surfa-
ce and hold it in an upright posi-
tion.
TIP
The coolant level must be chec-
ked on a cold engine since the
level varies with engine tempera-
ture.
Make sure that the vehicle is
positioned straight up when
checking the coolant level. A
slight tilt to the side can result in
a false reading.
2. Check the coolant level through
the check window.
TIP
The coolant should be between the
minimum and maximum level marks.
1. Maximum level mark
2. Minimum level mark
3. Coolant level check window
3. If the coolant is at or below the
minimum level mark, lift up the
right floorboard mat as shown.
FULL
LOW
Recommended final transmission
oil:
See page 8-1
Oil quantity:
0.21 L (0.22 US qt, 0.18 Imp.qt)
Tightening torque:
Final transmission oil drain bolt:
PERIODIC MAINTENANCE AND ADJUSTMENT
6-14
6
each ride, and the pivots and metal-
to-metal contact surfaces should be
lubricated if necessary.
EWA10741
If the centerstand or sidestand
does not move up and down smo-
othly, have a Yamaha dealer check
or repair it. Otherwise, the centers-
tand or sidestand could contact the
ground and distract the operator,
resulting in a possible loss of con-
trol.
EAU23272
Checking the front fork
The condition and operation of the
front fork must be checked as follows
at the intervals specified in the perio-
dic maintenance and lubrication
chart.
To check the condition
1. Check the inner tubes for scrat-
ches, damage and excessive oil
leakage.
To check the operation
1. Place the vehicle on a level surfa-
ce 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.
[EWA10751]
2. While applying the front brake,
push down hard on the handle-
bars several times to check if the
front fork compresses and
rebounds smoothly.
ECA10590
If any damage is found or the front
fork does not operate smoothly,
have a Yamaha dealer check or
repair it.
NOTICERecommended lubricant:
Lithium-soap-based grease
WARNING
PERIODIC MAINTENANCE AND ADJUSTMENT
6-25
6
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
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Clutch:Clutch type:
Dry, centrifugal automatic
Transmission:Primary reduction system:
Helical gear
Primary reduction ratio:
41/14 (2.929)
Secondary reduction system:
Helical gear
Secondary reduction ratio:
44/13 (3.385)
Transmission type:
V-belt automatic
Operation:
Centrifugal automatic type
Chassis:Frame type:
Steel tube underbone
Caster angle:
28.00 º
Trail:
100.0 mm (3.94 in)
Front tire:Type:
Tubeless
Size:
120/70-15 M/C 56P(PIRELLI-METZE-
LER)-56S(MICHELIN)
Manufacturer/model:
PIRELLI / GTS23
MICHELIN / GOLD STANDARDMICHELIN / CITYGRIP
METZELER / FEELFREE
Rear tire:Type:
Tubeless
Size:
140/70-14 M/C 68P(PIRELLI-METZE-
LER)-68S(MICHELIN)
Manufacturer/model:
PIRELLI / GTS24
MICHELIN / GOLD STANDARD
MICHELIN / CITYGRIP
METZELER / FEELFREE
Loading:Maximum load:
YP125R 182 kg (401 lb)
YP125RA 179 kg (395 lb)
YP125R Sport 180.5 kg (398 lb)
YP125RA Business 171.8 kg (379 lb)
Tire air pressure (measured on cold
tires):
Loading condition:
0–90 kg (0–198 lb)
Front:
190 kPa (1.90 kgf/cm
2, 28 psi, 1.90 bar)
Rear:
220 kPa (2.20 kgf/cm
2, 32 psi, 2.20 bar)
Loading condition:
90 kg - maximum load
Front:
210 kPa (2.10 kgf/cm
2, 30 psi, 2.10 bar)
Rear:
250 kPa (2.50 kgf/cm
2, 36 psi, 2.50 bar)
Front wheel:Wheel type:
Cast wheel
Rim size:
15 x MT3.5
Rear wheel:Wheel type:
Cast wheel
Rim size:
14 x MT3.75
Front brake:Type:
Single disc brake
Operation:
Right hand operation
Recommended fluid:
DOT 4
Rear brake:Type:
Single disc brake
Operation:
Left hand operation
Recommended fluid:
DOT 4
Front suspension:Type:
Telescopic fork
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
110.0 mm (4.33 in)
Rear suspension:Type:
Unit swing
SPECIFICATIONS
8-2
8