2004 YAMAHA WR 450F valve

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Page 380 of 754

YAMAHA WR 450F 2004  Owners Manual 4 - 40
ENGVALVES AND VALVE SPRINGS
ASSEMBLY AND INSTALLATION
1. Apply:
Molybdenum disulfide oil
Onto the valve stem and valve stem
seal.
2. Install:
Valves 1 
Valve spring seats 2 
Valve stem seal

Page 382 of 754

YAMAHA WR 450F 2004  Owners Manual 4 - 41
ENGVALVES AND VALVE SPRINGS
5. Install:
Adjusting pad 1 
Valve lifter 2 
NOTE:
Apply the engine oil on the valve lifters.
Apply the molybdenum disulfide oil on the
valve stem end.
Valve li

Page 560 of 754

YAMAHA WR 450F 2004  Owners Manual 5 - 28
CHASFRONT FORK
EC558000
FRONT FORK DISASSEMBLY
Extent of removal:1 Oil seal removal2 Damper rod removal
Extent of removal Order Part name Q’ty Remarks
FRONT FORK DISASSEMBLY
1  Cap bolt 1 Ref

Page 564 of 754

YAMAHA WR 450F 2004  Owners Manual 5 - 30
CHAS
EC553201
Inner tube
1. Remove:
Dust seal 1 
Stopper ring 2 
Using slotted-head screwdriver.
CAUTION:
Take care not to scratch the inner tube.
2. Remove:
Inner tube 1 
Oil seal removal s

Page 566 of 754

YAMAHA WR 450F 2004  Owners Manual 5 - 31
CHAS
EC554200
Base valve
1. Inspect:
Valve assembly 1 
Wear/damage → Replace.
O-ring 2 
Damage → Replace.
EC554400
Fork spring
1. Measure:
Fork spring free length a 
Out of specification

Page 568 of 754

YAMAHA WR 450F 2004  Owners Manual 5 - 32
CHAS
EC554700
Cap bolt
1. Inspect:
Cap bolt 1 
O-ring 2 
Air bleed screw 3 
Wear/damage → Replace.
FRONT FORK
EC555000
ASSEMBLY AND INSTALLATION
Front fork assembly
1. Wash the all parts i

Page 630 of 754

YAMAHA WR 450F 2004  Owners Manual 5 - 63
CHAS
EC586000
HANDLING NOTE
WARNING
This shock absorber is provided with a
separate type tank filled with high-pressure
nitrogen gas. To prevent the danger of
explosion, read and understand the

Page 631 of 754

YAMAHA WR 450F 2004  Owners Manual 5 - 63
CHAS
HINWEIS ZUM UMGANG MIT DEM
STOSSDÄMPFER
WARNUNG
Der Stoßdämpfer enthält Stick-
stoff unter hohem Druck. Vor
Arbeiten am Stoßdämpfer die fol-
genden Erläuterungen sorgfältig
durchle
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