2003 YAMAHA YZ250F ECU

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Page 7 of 662

YAMAHA YZ250F 2003  Owners Manual  
ZUR BEACHTUNG 
Dieses Motorrad ist ausschließlich
für den Einsatz im Gelände-Renn-
sport auf geschlossenen Kursen
bestimmt. Die Benutzung dieses
Fahrzeugs auf öffentlichen Straßen
verstößt ge

Page 8 of 662

YAMAHA YZ250F 2003  Owners Manual  
6. GASOLINE CAN CAUSE INJURY.
If you should swallow some gasoline,
inhale excess gasoline vapors, or
allow any gasoline to get into your
eyes, contact a doctor immediately. If
any gasoline spills on

Page 13 of 662

YAMAHA YZ250F 2003  Owners Manual  
COMMENT UTILISER 
CE MANUEL 
INFORMATIONS PARTI-
CULIEREMENT IMPOR-
TANTES 
Le symbole d’alerte de sécurité signifie 
ATTENTION! SOYEZ VIGILANT!
VOTRE SECURITE EST EN JEU!
Le non-respect des ins

Page 38 of 662

YAMAHA YZ250F 2003  Owners Manual GEN
INFO
1 - 7
SPECIAL TOOLS
SPECIAL TOOLS
The proper special tools are necessary for complete and accurate tune-up and assembly. Using the
correct special tool will help prevent damage caused by the

Page 39 of 662

YAMAHA YZ250F 2003  Owners Manual GEN
INFO
1 - 8
SPECIAL TOOLS
YU-33975, 90890-01403 Steering nut wrench
This tool is used when tighten the steering ring nut to 
specification.YU-33975 90890-01403
YM-1423, 90890-01423 Damper rod holde

Page 70 of 662

YAMAHA YZ250F 2003  Owners Manual 1 - 19
GEN
INFO
CLEANING AND STORAGE
EC1B0000
CLEANING AND STORAGE
EC1B1000
CLEANING
Frequent cleaning of your machine will
enhance its appearance, maintain good over-
all performance, and extend the

Page 334 of 662

YAMAHA YZ250F 2003  Owners Manual 4 - 41
ENGVALVES AND VALVE SPRINGS
3. Install:
Valve cotter
NOTE:
While compressing the valve spring with a
valve spring compressor 1 install the valve
cotters.
4. To secure the valve cotters onto th

Page 416 of 662

YAMAHA YZ250F 2003  Owners Manual 4 - 82
ENGENGINE REMOVAL
EC4M0000
ENGINE REMOVAL
Extent of removal Order Part name Q’ty Remarks
ENGINE REMOVAL
Preparation for removal Hold the machine by placing the 
suitable stand under the frame
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