maintenance YAMAHA YZ85 2007 Owner's Guide

PERIODIC MAINTENANCE AND MINOR REPAIR
6-29
6
EAU25870
Troubleshooting Although Yamaha motorcycles receive
a thorough inspection before shipment
from the factory, trouble may occur dur-
ing operation. Any problem in the fuel,
compression, or ignition systems, for
example, can cause poor starting and
loss of power.
The following troubleshooting charts
represent quick and easy procedures
for checking these vital systems your-
self. However, should your motorcycle
require any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the motorcycle
properly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look like
Yamaha parts, but they are often inferi-
or, have a shorter service life and can
lead to expensive repair bills.
Tightening torque:
Axle nut:
90 Nm (9.0 m·kgf, 65 ft·lbf)
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PERIODIC MAINTENANCE AND MINOR REPAIR
6-30
6
EAU41491
Troubleshooting charts Starting problems or poor engine performance
WARNING
EWA10840
Keep away open flames and do not smoke while checking or working on the fuel system.
Check the fuel level in
the fuel tank.1. Fuel
There is
enough fuel.
There is
no fuel.
Supply fuel.
Operate the kickstarter.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
DryWipe 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.
Have a Yamaha dealer check the vehicle.
Open the throttle halfway and operate
the kickstarter.
Check the compression.
The engine does not start.
Check the compression.
chapter6 Page 30 Tuesday, April 18, 2006 10:09 AM

PERIODIC MAINTENANCE AND MINOR REPAIR
6-31
6 Engine overheating
WARNING
EWAT1040


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.


Place a thick rag, like a towel, over the radiator cap, and then slowly rotate the cap counterclockwise to the de-
tent to allow any residual pressure to escape. When the hissing sound has stopped, press down on the capwhile turning it counterclockwise, and then remove the cap.
NOTE:If 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
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 NOTE.)
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.
chapter6 Page 31 Tuesday, April 18, 2006 10:09 AM

INDEX
AAccessories and replacement parts ..... 6-17
Air filter element, cleaning .................... 6-12BBrake and clutch levers, checking
and lubricating .................................... 6-23
Brake and shift pedals, checking
and lubricating .................................... 6-23
Brake fluid, changing ............................ 6-20
Brake fluid level, checking .................... 6-19
Brake lever ............................................. 3-2
Brake pedal ............................................ 3-2CCables, checking and lubricating .......... 6-22
Carburetor, adjusting ............................ 6-14
Care ........................................................ 7-1
Clutch lever............................................. 3-1
Clutch lever free play, adjusting ........... 6-17
Coolant ................................................. 6-10DDrive chain, cleaning and lubricating .... 6-21
Drive chain slack .................................. 6-20EEngine break-in ...................................... 5-3
Engine, starting a warm .......................... 5-1
Engine stop button.................................. 3-1FFront and rear brake pads, checking .... 6-18
Front fork, adjusting ................................ 3-7
Front fork, bleeding................................. 3-8
Front fork, checking .............................. 6-24
Fuel......................................................... 3-3
Fuel cock ................................................ 3-5
Fuel tank breather hose.......................... 3-5Fuel tank cap........................................... 3-3
HHandlebar switch..................................... 3-1IIdentification numbers ............................. 9-1KKickstarter ............................................... 3-6LLabels, location of ...................................1-4MModel label .............................................. 9-1PParking ....................................................5-4
Part locations .......................................... 2-1
Periodic maintenance and lubrication
chart ......................................................6-2
Pre-operation check list........................... 4-2RRear suspension, lubricating ................. 6-24SSafety information ...................................1-1
Seat ......................................................... 3-6
Shifting ....................................................5-2
Shift pedal ............................................... 3-1
Shock absorber assembly, adjusting ...... 3-9
Sidestand .............................................. 3-12
Spark plug, checking ...............................6-8
Specifications .......................................... 8-1
Starter (choke) knob................................ 3-6
Starting and warming up a cold
engine ................................................... 5-1
Steering, checking.................................6-25
Storage....................................................7-3
Supporting the motorcycle .................... 6-26Swingarm pivots, lubricating ................. 6-24
TThrottle cable free play, adjusting ......... 6-14
Throttle grip and cable, checking
and lubricating .................................... 6-22
Tires ...................................................... 6-15
Transmission oil ...................................... 6-9
Troubleshooting .................................... 6-29
Troubleshooting charts ......................... 6-30VVehicle identification number .................. 9-1WWheel bearings, checking..................... 6-26
Wheel (front) ......................................... 6-27
Wheel (rear) .......................................... 6-27
Wheels .................................................. 6-17
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