Yamaha YZF-R125, Service Manual

Page: 187 / 356

CYLINDER HEAD
5-12
3. Install:
• Camshaft sprocket
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a. Turn the crankshaft counterclockwise.
b. Align the “I” mark “a” on the generator rotor
with the stationary pointer “b” on the genera-
tor cover.
c. Align the “I” mark “c” on the camshaft sprock-
et with the stationary pointer “d” on the cylin-
der head.
d. Install the timing chain onto the camshaft
sprocket, and then install the camshaft
sprocket onto the camshaft.
NOTE:
When installing the camshaft sprocket, be sure
to keep the timing chain as tight as possible on
the exhaust side.
CAUTION:
ECA5D71012
Do not turn the crankshaft when installing
the camshaft(s) to avoid damage or improper
valve timing.
e. While holding the camshaft, temporarily tight-
en the camshaft sprocket bolt.
f. Remove the wire from the timing chain.
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4. Install:
• Timing chain tensioner gasket
• Timing chain tensioner
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a. Apply sealant to the timing chain tensioner
bolt threads.
b. While lightly pressing the timing chain ten-
sioner rod by hand, turn the tensioner rod ful-
ly clockwise with a thin screwdriver “1”.
c. With the timing chain tensioner rod turned all
the way into the timing chain tensioner hous-
ing (with the thin screwdriver still installed), in-
stall the gasket and the timing chain tensioner
“2” onto the cylinder block.
d. Tighten the timing chain tensioner bolts “3” to
the specified torque.
e. Remove the screwdriver, make sure the tim-
ing chain tensioner rod releases.
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4
2
6
5
3
1
1
2
2
b
a
d
c
Yamaha bond No. 1215
90890-85505
(Three Bond No.1215®)
T
R
.
.
Timing chain tensioner bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
New
1
1
3
2
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