check engine YAMAHA WR 125R 2009 Owner's Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
6-32
6
EAU24350
Supporting the motorcycle Since this model is not equipped with a
centerstand, follow these precautions
when removing the front and rear
wheel or performing other maintenance
requiring the motorcycle to stand up-
right. Check that the motorcycle is in a
stable and level position before starting
any maintenance. A strong wooden
box can be placed under the engine for
added stability.
To service the front wheel
1. Stabilize the rear of the motorcycle
by using a motorcycle stand or, if
an additional motorcycle stand is
not available, by placing a jack un-
der the frame in front of the rear
wheel.
2. Raise the front wheel off the
ground by using a motorcycle
stand.
To service the rear wheel
Raise the rear wheel off the ground by
using a motorcycle stand or, if a motor-
cycle stand is not available, by placinga jack either under each side of the
frame in front of the rear wheel or under
each side of the swingarm.
EAU24360
Front wheel
EAUM2632
To remove the front wheel
WARNING
EWA10821
To avoid injury, securely support the
vehicle so there is no danger of itfalling over.
1. Loosen the front wheel axle pinch
bolts, then the wheel axle and the
brake caliper bolts.1. Front wheel axle pinch bolt
2. Wheel axle
3. Speed sensor cable holder
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-37
6
EAUM2441
Troubleshooting charts Starting problems or poor engine performance
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.
There is no fuel.
Check the compression.
Supply fuel.
Operate the electric starter.2. Compression
There is compression.
There is no compression.
Check the ignition.
Have a Yamaha dealer
check the vehicle.
Remove the spark plug
and check the electrodes.3. Ignition
Wet
Dry
Wipe off with a dry cloth and correct the
spark plug gap, or replace the spark plug.
Have a Yamaha dealer check the vehicle.The engine does not start.
Check the battery.
Operate the electric starter.
Operate the electric starter.4. Battery
The engine turns over
quickly.
The engine turns over
slowly.The battery is good.
Check the electrolyte and battery
lead connections, and charge the
battery if necessary.The engine does not start.
Have a Yamaha dealer
check the vehicle.
The engine does not start.
Check the compression.
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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

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
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