2009 YAMAHA WR 125R engine coolant

PERIODIC MAINTENANCE AND ADJUSTMENT
6-38
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 hissingsound 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 coolantas 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.
U22BE0E0.book Page 38 Wednesday, December 17, 2008 11:00 AM

SPECIFICATIONS
8-1
8
Dimensions:Overall length:
WR125R 2125 mm (83.7 in)
WR125X 2090 mm (82.3 in)
Overall width:
835 mm (32.9 in)
Overall height:
WR125R 1285 mm (50.6 in)
WR125X 1260 mm (49.6 in)
Seat height:
WR125R 930 mm (36.6 in)
WR125X 920 mm (36.2 in)
Wheelbase:
1430 mm (56.3 in)
Ground clearance:
WR125R 265 mm (10.43 in)
WR125X 255 mm (10.04 in)
Minimum turning radius:
2200 mm (86.6 in)Weight:With oil and fuel:
WR125R 133.0 kg (293 lb)
WR125X 137.0 kg (302 lb)Engine:Engine type:
Liquid cooled 4-stroke, SOHC
Cylinder arrangement:
Forward-inclined single cylinder
Displacement:
124.7 cm³
Bore × stroke:
52.0 × 58.6 mm (2.05 × 2.31 in)
Compression ratio:
11.20 :1Starting system:
Electric starter
Lubrication system:
Wet sump
Engine oil: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
standard MA
Engine oil quantity:
Without oil filter element replacement:
0.95 L (1.00 US qt, 0.84 Imp.qt)
With oil filter element replacement:
1.00 L (1.06 US qt, 0.88 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):
1.10 L (1.16 US qt, 0.97 Imp.qt)
Air filter:Air filter element:
Dry elementFuel:Recommended fuel:
Premium unleaded gasoline only
Fuel tank capacity:
8.5 L (2.25 US gal, 1.87 Imp.gal)
Fuel reserve amount:
1.6 L (0.42 US gal, 0.35 Imp.gal)Fuel injection:Throttle body:
Type/quantity:
SE AC28-2/1Spark plug (s):Manufacturer/model:
NGK/CR8E
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)Clutch:Clutch type:
Wet, multiple-discTransmission:Primary reduction system:
Helical gear
Primary reduction ratio:
73/24 (3.042)
Secondary reduction system:
Chain drive
Secondary reduction ratio:
53/14 (3.786)
Transmission type:
Constant mesh 6-speed
-20 -10 0
10 20 30
40
50 ˚C
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40SAE 10W-50
U22BE0E0.book Page 1 Wednesday, December 17, 2008 11:00 AM

SPECIFICATIONS
8-3
8
Rear suspension:Type:
Swingarm (monocross)
Spring/shock absorber type:
WR125R Coil spring/gas-oil damper
WR125X Coil spring/oil damper
Wheel travel:
230.0 mm (9.06 in)Electrical system:Ignition system:
TCI (digital)
Charging system:
AC magnetoBattery:Model:
12N5.5-4A
Voltage, capacity:
12 V, 5.5 AhHeadlight:Bulb type:
Halogen bulbBulb voltage, wattage × quantity:Headlight:
12 V, 35 W/35 W × 1
Tail/brake light:
12 V, 21.0 W/5.0 W × 1
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 × 1
License plate light:
12 V, 5.0 W × 1Meter lighting:
LED
Neutral indicator light:
LED
High beam indicator light:
LED
Turn signal indicator light:
LED
Coolant temperature warning light:
LED
Engine trouble warning light:
LED
Fuses:Main fuse:
20.0 A
Headlight fuse:
15.0 A
Signaling system fuse:
7.5 A
Ignition fuse:
7.5 A
Radiator fan fuse:
5.0 A
U22BE0E0.book Page 3 Wednesday, December 17, 2008 11:00 AM

INDEXAAir filter element and check hose,
replacing and cleaning........................ 6-13
Auxiliary light bulb, replacing ................ 6-31BBattery................................................... 6-27
Brake and clutch levers, checking and
lubricating ........................................... 6-24
Brake fluid, changing ............................ 6-21
Brake fluid level, checking .................... 6-20
Brake lever .............................................. 3-6
Brake pedal ............................................. 3-7
Brake pedal, checking and
lubricating ........................................... 6-25
Brake pedal free play, adjusting............ 6-19CCables, checking and lubricating .......... 6-23
Care ........................................................ 7-1
Catalytic converters ................................ 3-9
Clutch lever ............................................. 3-6
Clutch lever free play, adjusting ............ 6-18
Coolant.................................................. 6-12
Coolant temperature warning light .......... 3-2DDimmer switch ........................................ 3-5
Drive chain, cleaning and lubricating .... 6-23
Drive chain slack ................................... 6-21EEngine break-in ....................................... 5-3
Engine idling speed............................... 6-14
Engine oil and oil filter element ............... 6-9
Engine stop switch .................................. 3-5
Engine trouble warning light.................... 3-3
FFront and rear brake pads, checking .... 6-19
Front brake lever free play, checking ... 6-19
Front fork, checking .............................. 6-26
Fuel......................................................... 3-8
Fuel consumption, tips for reducing........ 5-3
Fuel tank cap .......................................... 3-7
Fuses, replacing ................................... 6-29HHandlebar switches ................................ 3-5
Headlight bulb, replacing ...................... 6-29
High beam indicator light ........................ 3-2
Horn switch ............................................. 3-5IIdentification numbers ............................ 9-1
Ignition circuit cut-off system ................ 3-12
Indicator and warning lights .................... 3-2KKey identification number ....................... 9-1LLicense plate light bulb, replacing ........ 6-31MMain switch/steering lock........................ 3-1
Maintenance and lubrication, periodic .... 6-3
Maintenance, emission control system... 6-2
Model label ............................................. 9-2
Multi-function display .............................. 3-3NNeutral indicator light .............................. 3-2PPanels, removing and installing .............. 6-7
Parking ................................................... 5-4
Part locations .......................................... 2-1
Pass switch............................................. 3-5
SSafety information ................................... 1-1
Seat ....................................................... 3-10
Shifting .................................................... 5-2
Shift pedal ............................................... 3-6
Shock absorber assembly, adjusting .... 3-10
Sidestand .............................................. 3-11
Sidestand, checking and lubricating...... 6-25
Spark plug, checking ............................... 6-8
Specifications .......................................... 8-1
Starting the engine .................................. 5-1
Start switch.............................................. 3-5
Steering, checking................................. 6-26
Storage.................................................... 7-3
Supporting the motorcycle .................... 6-32
Swingarm pivots, lubricating ................. 6-25TTail/brake light bulb, replacing .............. 6-30
Throttle cable free play, adjusting ......... 6-14
Throttle grip and cable, checking and
lubricating ........................................... 6-24
Tires ...................................................... 6-15
Tool kit..................................................... 6-1
Troubleshooting .................................... 6-35
Troubleshooting charts.......................... 6-37
Turn signal indicator light ........................ 3-2
Turn signal light bulb, replacing ............ 6-31
Turn signal switch ................................... 3-5VValve clearance..................................... 6-15
Vehicle identification number .................. 9-1WWheel bearings, checking ..................... 6-27
Wheel (front) ......................................... 6-32
U22BE0E0.book Page 1 Wednesday, December 17, 2008 11:00 AM