Yamaha YZ450F Manuel D'atelier Du Proprietaire page 188

VALVE CLEARANCE ADJUSTMENT
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Install the timing chain tensioner.
G
Refer to "CAMSHAFTS" section in the
CHAPTER 4.
NOTE:
Turn the crankshaft counterclockwise sev-
eral turns so that the installed parts settle
into the right position.
Recheck the valve clearance.
G
If the clearance is still incorrect, repeat all
G
the clearance adjustment steps until the
specified clearance is obtained.
6. Install:
All removed parts
G
NOTE:
Install all removed parts in reversed order of
their removal.
INSP
ADJ