2009 YAMAHA WR 450F light

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Page 116 of 226

YAMAHA WR 450F 2009  Owners Manual 5-18
CAMSHAFTS
3. Measure:
• Runout (camshaft)
Out of specification→Replace.
4. Measure:
• Camshaft-to-cap clearance
Out of specification→Measure 
camshaft outside diameter.
Measurement steps:

Page 117 of 226

YAMAHA WR 450F 2009  Owners Manual 5-19
CAMSHAFTS
INSTALLING THE CAMSHAFT
1. Install:
• Exhaust camshaft "1"
• Intake camshaft "2"
Installation steps:
a. Turn the crankshaft counterclock-
wise with a wrench.
• Apply the molybdenu

Page 123 of 226

YAMAHA WR 450F 2009  Owners Manual 5-25
VALVES AND VALVE SPRINGS
3. Inspect:
• Valve face
Pitting/wear→Grind the face.
• Valve stem end
Mushroom shape or diameter 
larger than the body of the stem→
Replace.
4. Measure:
• Marg

Page 124 of 226

YAMAHA WR 450F 2009  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 158 of 226

YAMAHA WR 450F 2009  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 160 of 226

YAMAHA WR 450F 2009  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 162 of 226

YAMAHA WR 450F 2009  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 176 of 226

YAMAHA WR 450F 2009  Owners Manual 6-13
FRONT BRAKE AND REAR BRAKE
INSTALLING THE FRONT BRAKE 
MASTER CYLINDER
1. Install:
• Brake master cylinder "1"
• Brake master cylinder bracket "2"
• Bolt (brake master cylinder brack-
et) "
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