Yamaha 2009 YFM25RY Service Manual page 180

b. With the timing chain tensioner rod turned
all the way into the timing chain tensioner
housing (with the thin screwdriver still
installed), install the new gasket and the
timing chain tensioner "2" onto the body
cylinder.
c. Tighten the timing chain tensioner bolts "3"
to the specified torque.
Camshaft sprocket bolt
10 Nm (1.0 m·kg, 7.4 ft·lb)
d. Remove the screwdriver, make sure that
the timing chain tensioner rod releases,
and then tighten the cap bolt "4" to the
specified torque.
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6. Turn:
• Crankshaft
(several turns counterclockwise)
7. Check:
• "I" mark "a"
Align the "I" mark on the generator rotor
with the stationary pointer "b" on the
crankcase cover.
• "I" mark "c"
Align the "I" mark on the camshaft
sprocket with the stationary pointer "d" on
the cylinder head.
Out of alignment → Correct.
Refer to the installation steps above.
8. Tighten:
• Camshaft sprocket bolt
Camshaft sprocket bolt
60 Nm (6.0 m·kg, 44 ft·lb)
ECA13750
Be sure to tighten the camshaft sprocket
bolts to the specified torque to avoid the
possibility of the bolts coming loose and
damaging the engine.
9. Measure:
• Valve clearance
Out of specification → Adjust.
Refer to "ADJUSTING THE VALVE
CLEARANCE" on page 3-4.
5-15
CYLINDER HEAD