2000 YAMAHA YZ426F radiator

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Page 139 of 608

YAMAHA YZ426F 2000  Owners Manual  
3 - 2
INSP
ADJ
 
MAINTENANCE INTERVALS 
SHIFT FORK, SHIFT CAM, GUIDE BAR
Inspect 
c 
Inspect wear
ROTOR NUT
Retighten 
cc 
MUFFLER
Inspect
Clean
Replace 
cc
cc 
* Whichever comes first
CRANK
Inspect

Page 147 of 608

YAMAHA YZ426F 2000  Owners Manual  
3 - 4
INSP
ADJ
 
PRE-OPERATION INSPECTION AND MAINTENANCE 
EC320000 
PRE-OPERATION INSPECTION AND MAINTENANCE 
Before riding for break-in operation, practice or a race, make sure the machine is in g

Page 150 of 608

YAMAHA YZ426F 2000  Owners Manual  
3 - 5
INSP
ADJ
 
EC350000 
ENGINE 
EC351011 
COOLANT LEVEL INSPECTION
WARNING
 
Do not remove the radiator cap  
1  
, drain
bolt and hoses when the engine and radia-
tor are hot. Scalding hot fluid

Page 152 of 608

YAMAHA YZ426F 2000  Owners Manual  
3 - 6
INSP
ADJ
 
COOLANT REPLACEMENT 
EC353011 
COOLANT REPLACEMENT
WARNING
 
Do not remove the radiator cap when the 
engine is hot.
CAUTION:
 
Take care so that coolant does not splash
on painted

Page 154 of 608

YAMAHA YZ426F 2000  Owners Manual  
3 - 7
INSP
ADJ
 
RADIATOR CAP INSPECTION
CAUTION:
 
l 
Do not mix more than one type of ethyl-
ene glycol antifreeze containing corro-
sion inhibitors for aluminum engine. 
l 
Do not use water conta

Page 156 of 608

YAMAHA YZ426F 2000  Owners Manual 3 - 8
INSP
ADJRADIATOR CAP OPENING PRESSURE INSPECTION/
COOLING SYSTEM INSPECTION
EC356001
RADIATOR CAP OPENING PRESSURE 
INSPECTION
1. Attach:
lRadiator cap tester 1 and adapter 2 
NOTE:
Apply water

Page 158 of 608

YAMAHA YZ426F 2000  Owners Manual 3 - 9
INSP
ADJ
CLUTCH ADJUSTMENT
NOTE:
lDo not apply pressure more than specified
pressure.
lRadiator should be filled fully.
4. Inspect:
lPressure
Impossible to maintain the specified
pressure for 10

Page 176 of 608

YAMAHA YZ426F 2000  Owners Manual 3 - 18
INSP
ADJIDLE SPEED ADJUSTMENT/
VALVE CLEARANCE ADJUSTMENT
EC35M021
IDLE SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it
up.
2. Adjust:
lIdle speed
VALVE CLEARANCE ADJUSTMENT
NOTE:
l
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