2001 YAMAHA YZ426F check engine

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Page 149 of 626

YAMAHA YZ426F 2001  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 good ope

Page 152 of 626

YAMAHA YZ426F 2001  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 and steam
may

Page 156 of 626

YAMAHA YZ426F 2001  Owners Manual 3 - 7
INSP
ADJ
RADIATOR CAP INSPECTION
CAUTION:
lDo not mix more than one type of ethyl-
ene glycol antifreeze containing corro-
sion inhibitors for aluminum engine.
lDo not use water containing impur

Page 162 of 626

YAMAHA YZ426F 2001  Owners Manual 3 - 10
INSP
ADJ
THROTTLE CABLE ADJUSTMENT
EC35A001
THROTTLE CABLE ADJUSTMENT
1. Check:
lThrottle grip free play a 
Out of specification ® Adjust.
Throttle grip free play a:
3 ~ 5 mm (0.12 ~ 0.20 in)

Page 164 of 626

YAMAHA YZ426F 2001  Owners Manual 3 - 11
INSP
ADJTHROTTLE LUBRICATION/
DECOMPRESSION LEVER ADJUSTMENT
EC35S002
THROTTLE LUBRICATION
1. Remove:
lRubber cover 1
lThrottle cable cap 2 
2. Apply:
lLithium soap base grease
On the throttle

Page 168 of 626

YAMAHA YZ426F 2001  Owners Manual 3 - 13
INSP
ADJ
ENGINE OIL LEVEL INSPECTION
6. Apply:
lLithium soap base grease
On the matching surface a on air filter
element.
7. Install:
lAir filter element 1 
lWasher
lFitting bolt
NOTE:
Align th

Page 174 of 626

YAMAHA YZ426F 2001  Owners Manual 3 - 16
INSP
ADJ
ENGINE OIL REPLACEMENT
6. If the oil filter is to be replaced during this
oil change, remove the following parts
and reinstall them.
7. Install:
lPlain washer 1 
lOil strainer (frame)

Page 176 of 626

YAMAHA YZ426F 2001  Owners Manual 3 - 17
INSP
ADJ
PILOT SCREW ADJUSTMENT
12. Check:
lOil pressure
Checking steps:
lSlightly loosen the oil gallery bolt 1.
lStart the engine and keep it idling until oil
starts to seep from the oil gall
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