Page 58 of 96

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
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 88 of 96

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
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