Yamaha YZ450F Manuel D'atelier Du Proprietaire page 184

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3
VALVE CLEARANCE ADJUSTMENT
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5. Adjust:
• Valve clearance
Adjustment steps:
• Loosen the timing chain tensioner cap
bolt.
• Remove the timing chain tensioner and
camshaft caps.
NOTE:
Remove the camshaft cap bolts in a criss-
cross pattern from the outside working
inwards.
• Remove the camshaft (exhaust 1 and
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.
NOTE:
• Place a rag in the timing chain space to
prevent pads from falling into the crank-
case.
• Identity each valve lifter and pad position
very carefully so that they can be rein-
stalled in their original place.
• Select the proper pad using the pad
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 incre-
ments