2010 YAMAHA WR 450F service

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Page 1 of 230

YAMAHA WR 450F 2010  Owners Manual 
OWNER’S SERVICE MANUALMANUEL D’ATELIER DU  PROPRIETAIRE
FAHRER- UND 
WARTUNGSHANDBUCH
MANUAL DE SERVICIO  DEL PROPIETARI
O
WR450F (
Z )
5TJ-28199-47PRINTED IN JAPAN
2009.07—0.5  ×1 !
(E, F, G,

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YAMAHA WR 450F 2010  Owners Manual 
WR450F (Z)
OWNERS SERVICE MANUAL
©2009 by Yamaha Motor Co., Ltd. 1st Edition, July 2009
All rights reserved. Any reprinting or
unauthorized use wi thout the written 
permission of Yamaha Motor Co.,

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YAMAHA WR 450F 2010  Owners Manual 
HOW TO READ DESCRIPTIONS
To help identify parts and clarify pro-
cedure steps, there are exploded dia-
grams at the start of each removal 
and disassembly section.
1. An easy-to-see exploded diagram

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YAMAHA WR 450F 2010  Owners Manual 
1-4
LOCATION OF IMPORTANT LABELS
Familiarize yourself with the following pictograms and read the explanatory text.
Read Owners service manual.
This unit contains high-pressure nitrogen gas. Mi shand

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YAMAHA WR 450F 2010  Owners Manual 
2-1
GENERAL SPECIFICATIONS
SPECIFICATIONS
GENERAL SPECIFICATIONS
Model name: WR450FZ (USA, CDN, AUS, NZ)WR450F (EUROPE, ZA)
Model code number: 5TJT (USA) 5TJU (CDN)
5TJV (EUROPE)
5TJW (AUS, NZ, ZA)
D

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YAMAHA WR 450F 2010  Owners Manual 3-3
MAINTENANCE INTERVALS FOR COMPETITION USE
• The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
• Hydraulic brake service
• After disassembling the

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YAMAHA WR 450F 2010  Owners Manual 3-14
ENGINE
5. Inspect:
• Air filter element
Damage→Replace.
6. Apply:
• Foam-air-filter oil or equivalent oil 
to the element
• Squeeze out the excess oil. Ele-
ment should be wet but not dri

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YAMAHA WR 450F 2010  Owners Manual 3-16
ENGINE
Using a digital engine tachometer for 
idle speed adjustment, detect the en-
gine idling speed by bringing the 
sensing element "c" of the engine ta-
chometer close to the ignition coil "2
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