engine oil YAMAHA WR 450F 2010 Owner's Manual

YAMAHA WR 450F 2010 Owner's Manual WR 450F 2010 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52469/w960_52469-0.png YAMAHA WR 450F 2010 Owner's Manual

Page 82 of 230

YAMAHA WR 450F 2010 Owners Manual 3-23
CHASSIS
When installing the drive chain, apply 
the lithium soap base grease on the 
chain joint and O-rings.
7. Install:
• Link plate
• Press the link plate onto the chain 
joint using a dri

Page 83 of 230

YAMAHA WR 450F 2010 Owners Manual 3-24
CHASSIS
RELIEVING THE FRONT FORK 
INTERNAL PRESSURE
If the front fork initial movement feels 
stiff during a run, relieve the front fork 
internal pressure.
1. Elevate the front wheel by placing

Page 88 of 230

YAMAHA WR 450F 2010 Owners Manual 3-29
ELECTRICAL
ELECTRICAL
CHECKING THE SPARK PLUG
1. Remove:
• Spark plug
2. Inspect:
• Electrode "1"
Wear/damage→Replace.
• Insulator color "2"
Normal condition is a medium to 
light tan col

Page 98 of 230

YAMAHA WR 450F 2010 Owners Manual 4-5
CHASSIS
CHASSIS
SELECTION OF THE SECONDARY 
REDUCTION RATIO (SPROCKET)
<Requirement for selection of sec-
ondary gear reduction ratio>
• It is generally said that the second-
ary gear ratio shou

Page 122 of 230

YAMAHA WR 450F 2010 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 129 of 230

YAMAHA WR 450F 2010 Owners Manual 5-26
VALVES AND VALVE SPRINGS
h. Press the valve through the valve 
guide and onto the valve seat to 
make a clear pattern.
i. Measure the valve seat width 
again. If the valve seat width is out 
of s

Page 132 of 230

YAMAHA WR 450F 2010 Owners Manual 5-29
CYLINDER AND PISTON
3. Measure:
• Ring end gap
Out of specification→Replace.
You cannot measure the end gap on 
the expander spacer of the oil control 
ring. If the oil control ring rails sho

Page 133 of 230

YAMAHA WR 450F 2010 Owners Manual 5-30
CLUTCH
CLUTCH
REMOVING THE CLUTCH
Order Part name Qty Remarks
Drain the engine oil. Refer to "CHANGING THE ENGINE OIL" 
section in the CHAPTER 3.
Brake pedal  Refer to "ENGINE REMOVAL" section.

Page 135 of 230

YAMAHA WR 450F 2010 Owners Manual 5-32
CLUTCH
REMOVING THE CLUTCH BOSS
1. Remove:
•Nut "1"
• Lock washer "2"
• Clutch boss "3"
Straighten the lock washer tab and 
use the clutch holding tool "4" to hold 
the clutch boss.
A. For

Page 136 of 230

YAMAHA WR 450F 2010 Owners Manual 5-33
CLUTCH
2. Install:
• Lock washer "1" 
• Nut (clutch boss) "2"
Make sure to tighten to specifica-
tion; otherwise, it may damage the 
other part that is fastened togeth-
er.
• Install the lo