Yamaha WR450F(R) Owner's Service Manual page 224

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VALVE CLEARANCE ADJUSTMENT

Install the timing chain tensioner.

Refer to "CAMSHAFTS" section in the

Turn the crankshaft counterclockwise sev-

eral turns so that the installed parts settle

into the right position.

Recheck the valve clearance.

If the clearance is still incorrect, repeat all

the clearance adjustment steps until the

specified clearance is obtained.

All removed parts

Install all removed parts in reversed order of

their removal. Note the following points.

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