Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 236

CAMSHAFT AND CYLINDER HEAD
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Install the decompressor cam guide plates 9
G
and camshaft sprocket bolts 0.
Camshaft sprocket bolt:
20 Nm (2.0 m • kg, 14 ft • lb)
NOTE:
Insert a screwdriver into the timing chain ten-
sioner hole and push the timing chain guide
inward.
G
Remove the retaining wire.
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3.Install:
Timing chain guide
G
4.Install:
Timing chain tensioner
G
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Installation steps:
a.Lightly press the timing chain tensioner rod into
the timing chain tensioner housing by hand.
b.While pressing the timing chain tensioner
rod, wind it clockwise with a thin screwdriver
1 until it stops.
c.With the screwdriver still inserted into the
timing chain tensioner, install the timing
chain tensioner and gasket onto the cylinder
block. Then, tighten the timing chain ten-
sioner bolts to the specified torque.
WARNING
Always use a new gasket.
NOTE:
The "UP" mark on the timing chain tensioner
should face up.
Timing chain tensioner bolt
10 Nm (1.0 m • kg, 7.2 ft • lb)
d.Remove the screwdriver, make sure that the
timing chain tensioner rod releases, and
tighten the cap bolt to the specified torque.
Timing chain tensioner cap bolt
7 Nm (0.7 m • kg, 5.7 ft • lb)
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5.Check:
Small holes on camshaft sprocket
G
Rotor "I" mark
G
Out of alignment → Adjust.
ENG