2008 YAMAHA WR 450F light

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Page 115 of 224

YAMAHA WR 450F 2008  Owners Manual 5-19
CAMSHAFTS
Do not turn the crankshaft during 
the camshaft installation. Damage 
or improper valve timing will re-
sult.
d. Install the clips, camshaft caps "4" 
and bolts (camshaft cap) "5".
•

Page 121 of 224

YAMAHA WR 450F 2008  Owners Manual 5-25
VALVES AND VALVE SPRINGS
4. Measure:
• Margin thickness "a"
Out of specification→Replace.
5. Measure:
• Runout (valve stem)
Out of specification→Replace.
• When installing a new valve a

Page 122 of 224

YAMAHA WR 450F 2008  Owners Manual 5-26
VALVES AND VALVE SPRINGS
CHECKING THE VALVE SPRINGS
1. Measure:
• Valve spring free length "a"
Out of specification→Replace.
2. Measure:
• Compressed spring force "a"
Out of specification

Page 156 of 224

YAMAHA WR 450F 2008  Owners Manual 5-60
CRANKCASE AND CRANKSHAFT
DISASSEMBLING THE 
CRANKCASE
1. Separate:
• Right crankcase
• Left crankcase
Separation steps:
a. Remove the crankcase bolts, 
hose guide and clutch cable hold-
er.
L

Page 158 of 224

YAMAHA WR 450F 2008  Owners Manual 5-62
CRANKCASE AND CRANKSHAFT
4. Apply:
• Sealant
On the right crankcase.
Clean the contacting surface of left 
and right crankcase before applying 
the sealant.
5. Install:
• Dowel pin "1"
• O-

Page 160 of 224

YAMAHA WR 450F 2008  Owners Manual 5-64
TRANSMISSION, SHIFT CAM AND SHIFT FORK
REMOVING THE TRANSMISSION
1. Remove:
• Main axle "1"
• Drive axle "2"
• Shift cam
• Shift fork 3
• Shift fork 2
• Shift fork 1
• Remove assemb

Page 174 of 224

YAMAHA WR 450F 2008  Owners Manual 6-13
FRONT BRAKE AND REAR BRAKE
2. Install:
• Brake lever "1"
• Bolt (brake lever) "2"
• Nut (brake lever) "3"
Apply the silicone grease on the 
brake lever sliding surface, bolt and 
contacting

Page 175 of 224

YAMAHA WR 450F 2008  Owners Manual 6-14
FRONT BRAKE AND REAR BRAKE
3. Install:
• Brake hose holder "1"
• Nut (brake hose holder) "2"
Align the top "a" of the brake hose 
holder with the paint "b" of the brake 
hose.
4. Pass the bra
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