Yamaha YFM660RN Service Manual page 203

CAMSHAFT AND CYLINDER HEAD
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Install the decompressor cam guide plates 9
and camshaft sprocket bolts 0.
Camshaft sprocket bolt:
20 Nm (2.0 m • kg, 14 ft • lb)
Remove the retaining wire.
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3.Install:
Timing chain tensioner
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Installation steps:
Remove the timing chain tensioner cap bolt
1, washer 2 and spring 3.
Release the timing chain tensioner one-way
cam 4 and push the tensioner rod 5 all the
way in.
Install the tensioner 6 with a new gasket into
the cylinder.
Bolts (timing chain tensioner):
10 Nm (1.0 m • kg, 7.2 ft • lb)
WARNING
Always use a new gasket.
Install the spring, washer and timing chain
tensioner cap bolt.
Timing chain tensioner cap bolt:
22 Nm (2.2 m • kg, 16 ft • lb)
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4.Check:
Small holes on camshaft sprocket
Rotor "I" mark
Out of alignment → Adjust.
ENG