Yamaha WR450F(R) Owner's Service Manual page 86

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3
VALVE CLEARANCE ADJUSTMENT
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3 - 21
5. Adjust:
Valve clearance
G
Adjustment steps:
Loosen the timing chain tensioner cap
G
bolt.
Remove the timing chain tensioner and
G
camshaft caps.
NOTE:
Remove the camshaft cap bolts in a criss-
cross pattern from the outside working
inwards.
Remove the camshaft (exhaust 1 and
G
intake 2).
NOTE:
Attach a wire 3 to the timing chain to pre-
vent it from falling into the crankcase.
Remove the valve lifters 4 and the pads 5 .
G
NOTE:
Place a rag in the timing chain space to
G
prevent pads from falling into the crank-
case.
Identity each valve lifter and pad position
G
very carefully so that they can be rein-
stalled in their original place.
Select the proper pad using the pad
G
selecting table.
Pad range
No. 120 1.20 mm
~ ~
No. 240 2.40 mm
NOTE:
The thickness a of each pad is indicated in
hundreths of millimeters on the pad upper
surface.
INSP
ADJ
Pad Availability:
25 increments
Pads are available in
0.05 mm increments