2010 YAMAHA YZF-R125 engine coolant

PERIODIC MAINTENANCE AND ADJUSTMENT
6-39
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.
U5D7E1E0.book Page 39 Monday, July 13, 2009 11:55 AM

SPECIFICATIONS
8-1
8
Dimensions:Overall length:
2015 mm (79.3 in)
Overall width:
660 mm (26.0 in)
Overall height:
1065 mm (41.9 in)
Seat height:
818 mm (32.2 in)
Wheelbase:
1355 mm (53.3 in)
Ground clearance:
155 mm (6.10 in)
Minimum turning radius:
3100 mm (122.0 in)Weight:With oil and fuel:
138.0 kg (304 lb)Engine:Engine type:
Liquid cooled 4-stroke, SOHC
Cylinder arrangement:
Forward-inclined 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: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):
1.00 L (1.06 US qt, 0.88 Imp.qt)Air filter:Air filter element:
Dry element
Fuel:Recommended fuel:
Premium unleaded gasoline only
Fuel tank capacity:
13.8 L (3.65 US gal, 3.04 Imp.gal)
Fuel reserve amount:
1.6 L (0.42 US gal, 0.35 Imp.gal)Fuel injection:Throttle body:
ID mark:
5D71 00Spark 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:
48/14 (3.429)
Transmission type:
Constant mesh 6-speed
Operation:
Left foot operation
-20 -10 0
10 20 30
40
50 ˚C
SAE 10W-30
SAE 15W-40SAE 20W-40SAE 20W-50
SAE 10W-40SAE 10W-50
U5D7E1E0.book Page 1 Monday, July 13, 2009 11:55 AM

SPECIFICATIONS
8-3
8
Battery:Model:
12N5.5-3B / YUASA
Voltage, capacity:
12 V, 5.5 AhHeadlight:Bulb type:
Halogen bulbBulb voltage, wattage × quantity:Headlight:
12 V, 55 W × 2
Tail/brake light:
LED x 8
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
Meter 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:
LEDFuses:Main fuse:
20.0 AHeadlight fuse:
15.0 A
Signaling system fuse:
7.5 A
Ignition fuse:
7.5 A
Radiator fan fuse:
5.0 A
U5D7E1E0.book Page 3 Monday, July 13, 2009 11:55 AM

INDEXAAir filter element and check hose,
replacing and cleaning........................ 6-15
Auxiliary light bulb, replacing ................ 6-33BBattery................................................... 6-29
Brake and clutch levers, checking and
lubricating ........................................... 6-27
Brake and shift pedals, checking and
lubricating ........................................... 6-26
Brake fluid, changing ............................ 6-23
Brake fluid level, checking .................... 6-22
Brake lever .............................................. 3-6
Brake pedal ............................................. 3-7
Brake pedal free play, adjusting............ 6-21CCables, checking and lubricating .......... 6-25
Care ........................................................ 7-1
Catalytic converters ................................ 3-9
Clutch lever ............................................. 3-6
Clutch lever free play, adjusting ............ 6-20
Coolant.................................................. 6-13
Coolant temperature warning light .......... 3-2
Cowlings and panel, removing and
installing................................................ 6-7DDimmer switch ........................................ 3-5
Drive chain, cleaning and lubricating .... 6-25
Drive chain slack ................................... 6-23EEngine break-in ....................................... 5-3
Engine idling speed............................... 6-15
Engine oil and oil filter element ............. 6-10
Engine stop switch .................................. 3-5Engine trouble warning light ................... 3-3
FFront and rear brake pads, checking .... 6-21
Front brake lever free play, checking ... 6-21
Front fork, checking .............................. 6-28
Fuel......................................................... 3-8
Fuel consumption, tips for reducing........ 5-3
Fuel tank cap .......................................... 3-7
Fuses, replacing ................................... 6-31HHandlebar switches ................................ 3-5
Headlight bulb, replacing ...................... 6-32
High beam indicator light ........................ 3-2
Horn switch ............................................. 3-5IIdentification numbers ............................ 9-1
Ignition circuit cut-off system ................ 3-11
Indicator and warning lights .................... 3-2KKey identification number ....................... 9-1LLicense plate light bulb, replacing ........ 6-33MMain switch/steering lock........................ 3-1
Maintenance and lubrication, periodic .... 6-3
Maintenance, emission control system... 6-2
Matte color, caution ................................ 7-1
Model label ............................................. 9-2
Multi-function display .............................. 3-3NNeutral indicator light .............................. 3-2PParking ................................................... 5-4
Part locations .......................................... 2-1Pass switch ............................................. 3-5
RRider seat .............................................. 3-10SSafety information ................................... 1-1
Shifting .................................................... 5-2
Shift pedal ............................................... 3-6
Sidestand .............................................. 3-10
Sidestand, checking and lubricating...... 6-27
Spark plug, checking ............................... 6-9
Specifications .......................................... 8-1
Starting the engine .................................. 5-1
Start switch.............................................. 3-5
Steering, checking................................. 6-29
Storage.................................................... 7-3
Supporting the motorcycle .................... 6-33
Swingarm pivots, lubricating ................. 6-28TTachometer ............................................. 3-3
Tail/brake light ....................................... 6-32
Throttle cable free play, adjusting ......... 6-16
Throttle grip and cable, checking and
lubricating ........................................... 6-26
Tires ...................................................... 6-17
Tool kit..................................................... 6-1
Troubleshooting .................................... 6-37
Troubleshooting charts.......................... 6-38
Turn signal indicator light ........................ 3-2
Turn signal light bulb, replacing ............ 6-32
Turn signal switch ................................... 3-5VValve clearance..................................... 6-17
Vehicle identification number .................. 9-1
U5D7E1E0.book Page 1 Monday, July 13, 2009 11:55 AM