
PERIODIC MAINTENANCE AND ADJUSTMENT
6-10
6Before installing a spark plug, the spark
plug gap should be measured with a
wire thickness gauge and, if necessary,
adjusted to specification.
Clean the surface of the spark plug
gasket and its mating surface, and then
wipe off any grime from the spark plug
threads.
TIPIf 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 speci-
fied torque as soon as possible.
EAUS1703
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.TIPThe engine oil should be between the
minimum and maximum level marks.
1. Spark plug gapSpark 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
ZAUM0037
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-11
6 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.
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 replace-
ment)
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.3. Remove the engine oil filler cap
and the engine oil drain bolt to
drain the oil from the crankcase.
4. Check the drain bolt washer for
damage and replace it if neces-
sary.
TIPSkip steps 5–9 if the oil filter element is
not being replaced.5. Remove the oil filter element cover
by removing the bolts.
6. Remove the oil filter element and
O-ring.
1. Engine oil filler cap
2. Maximum level mark
3. Minimum level mark
1
32
1
ZAUM0685
1. Engine oil drain bolt
1. Engine oil drain bolt
2. WasherZAUM0702
11
2
ZAUM0129
1. Oil filter element coverZAUM0711
1
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-12
67. Check the O-ring for damage and
replace it if necessary.
8. Install the new oil filter element and
an O-ring.
9. Install the oil filter element cover by
installing the bolts, then tightening
them to the specified torque.
TIPMake 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.TIPMake 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.TIPBe sure to wipe off spilled oil on any
parts after the engine and exhaust sys-
tem have cooled down.
NOTICE
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 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, im-
mediately 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.
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 filter element
2. O-ring
3. Oil filter element coverTightening torque:
Oil filter cover bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)1
2
3
ZAUM0712
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)
U2ABE2E0.book Page 12 Thursday, August 30, 2012 2:36 PM

PERIODIC MAINTENANCE AND ADJUSTMENT
6-14
65. Remove the final transmission oil
drain bolt and its gasket to drain
the oil from the final transmission
case.6. Install the final transmission oil
drain bolt and its new gasket, and
then tighten the bolt to the speci-
fied torque.
7. Refill with the specified amount of
the recommended final transmis-
sion 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 fill-
er 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 cool-
ant 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 sur-
face and hold it in an upright posi-
tion.TIP●
The coolant level must be checked
on a cold engine since the level
varies with engine temperature.
●
Make sure that the vehicle is posi-
tioned 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.TIPThe coolant should be between the
minimum and maximum level marks.
1. Final transmission oil filler cap
2. O-ring
1. Final transmission oil drain boltZAUM0703
1
Tightening torque:
Final transmission oil drain bolt:
20 Nm (2.0 m·kgf, 14 ft·lbf)
Recommended final transmission
oil:
See page 8-1.
Oil quantity:
0.21 L (0.22 US qt, 0.18 Imp.qt)
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-23
6 Rear brake
WARNING
EWA16010
Improper maintenance can result in
loss of braking ability. Observe
these precautions:●
Insufficient brake fluid may al-
low air to enter the brake sys-
tem, reducing braking
performance.
●
Clean 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
ECA17640
Brake fluid may damage painted sur-
faces 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 sys-
tem leakage; therefore, be sure to
check the brake pads for wear and the
brake system for leakage. If the brakefluid level goes down suddenly, have a
Yamaha dealer check the cause before
further riding.
1. Minimum level markSpecified brake fluid:
DOT 4
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-26
6The operation of the centerstand and
sidestand should be checked before
each ride, and the pivots and metal-to-
metal contact surfaces should be lubri-
cated if necessary.
WARNING
EWA10741
If the centerstand or sidestand does
not move up and down smoothly,
have a Yamaha dealer check or re-
pair it. Otherwise, the centerstand or
sidestand could contact the ground
and distract the operator, resulting
in a possible loss of control.
EAU23272
Checking the front fork The condition and operation of the front
fork must be checked as follows at the
intervals specified in the periodic main-
tenance 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.
[EWA10751]
2. While applying the front brake,
push down hard on the handlebars
several times to check if the front
fork compresses and rebounds
smoothly.NOTICE
ECA10590
If any damage is found or the front
fork does not operate smoothly,
have a Yamaha dealer check or re-
pair it.
Recommended lubricant:
Lithium-soap-based grease
U2ABE2E0.book Page 26 Thursday, August 30, 2012 2:36 PM

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

INDEX
AABS (for ABS models) .......................... 3-13
ABS warning light (for ABS models) ....... 3-4
Acceleration and deceleration ................ 5-3
Air filter and V-belt case air filter
elements ............................................. 6-16
Anti-theft alarm (optional) ..................... 3-11
Auxiliary DC jack .................................. 3-23
Auxiliary light bulb, replacing ................ 6-33BBattery .................................................. 6-27
Brake fluid, changing ............................ 6-24
Brake fluid level, checking .................... 6-22
Brake lever, front .................................. 3-12
Brake lever, rear ................................... 3-13
Brake levers, lubricating ....................... 6-25
Braking ................................................... 5-3CCables, checking and lubricating .......... 6-24
Care ........................................................ 7-1
Catalytic converters .............................. 3-16
Centerstand and sidestand,
checking and lubricating ..................... 6-25
Coolant ................................................. 6-14
Cowling and panel,
removing and installing......................... 6-8DDimmer switch ...................................... 3-12EEngine break-in ...................................... 5-4
Engine oil .............................................. 6-10
Engine trouble warning light ................... 3-4FFinal transmission oil ............................ 6-13Front and rear brake lever free play,
checking .............................................. 6-21
Front and rear brake pads, checking .... 6-21
Front fork, checking...............................6-26
Fuel ....................................................... 3-15
Fuel consumption, tips for reducing ........ 5-4
Fuel tank cap......................................... 3-14
Fuses, replacing .................................... 6-29
HHandlebar switches ............................... 3-11
Hazard switch........................................ 3-12
Headlight bulb, replacing....................... 6-30
High beam indicator light......................... 3-4
Horn switch ........................................... 3-12IIdentification numbers ............................. 9-1
Ignition circuit cut-off system ................. 3-21
Immobilizer system .................................3-1
Immobilizer system indicator light ........... 3-5
Indicator lights and warning lights ........... 3-4LLicense plate light .................................6-33MMain 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 display...............................3-6PParking ....................................................5-5
Part locations .......................................... 2-1
Pass switch ........................................... 3-12
SSafe-riding points .................................... 1-5
Safety information ................................... 1-1
Seat ...................................................... 3-17
Securing bracket ................................... 3-17
Shock absorber assemblies,
adjusting ............................................. 3-20
Sidestand .............................................. 3-21
Spark plug, checking .............................. 6-9
Specifications.......................................... 8-1
Speedometer .......................................... 3-5
Starting off .............................................. 5-2
Starting the engine.................................. 5-1
Start switch ........................................... 3-12
Steering, checking ................................ 6-27
Storage ................................................... 7-3
Storage compartments ......................... 3-18TTachometer............................................. 3-6
Tail/brake light bulb or
rear turn signal light bulb, replacing.... 6-31
Throttle grip and cable,
checking and lubricating ..................... 6-24
Throttle grip free play, adjusting ........... 6-17
Tires ...................................................... 6-18
Tool kit .................................................... 6-2
Travel trunk ........................................... 3-19
Troubleshooting .................................... 6-33
Troubleshooting charts ......................... 6-35
Turn signal indicator lights ...................... 3-4
Turn signal light bulb (front),
replacing ............................................. 6-31
Turn signal switch ................................. 3-12
U2ABE2E0.book Page 1 Thursday, August 30, 2012 2:36 PM