CYLINDER HEAD (YP125R)
5-11
d. Make sure that the timing chain tensioner rod
comes out of the timing chain tensioner hous-
ing smoothly. If there is rough movement, re-
place the timing chain tensioner.
e. Install the timing chain tensioner plug.
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EAS37P1006
INSTALLING THE CYLINDER HEAD
1. Tighten:
• Cylinder head nuts “1”
• Cylinder head bolts “2”
IP
• Lubricate the cylinder head nuts with engine
oil.
• Tighten the cylinder head nuts and bolts in the
proper tightening sequence as shown and
torque them in two stages.
2. Install:
• Camshaft sprocket
• Timing chain
• Camshaft sprocket bolt
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a. Turn the primary sheave nut on the left side
of the crankshaft counterclockwise to turn the
crankshaft.
b. Align the “I” mark “a” on the generator rotor
with the stationary pointer “b” on the genera-
tor cover.
c. Install the timing chain “1” onto the camshaft
sprocket “2”, then the camshaft sprocket onto
the camshaft, and then finger tighten the
camshaft sprocket bolt.
IP
Fit the projections “c” on the camshaft into the
holes “d” in the camshaft sprocket and fit the pin
“e” on the decompression cam into the slot “f” in
the decompression lever on the camshaft
sprocket.
NOTICE
ECA37P1001
Do not turn the crankshaft when installing
the camshaft to avoid damage or improper
valve timing.
d. Make sure the “I” mark “g” on the camshaft
sprocket with the stationary pointer “h” on the
cylinder head.
IP
When installing the camshaft sprocket, be sure
to keep the timing chain as tight as possible on
the exhaust side.
T
R
.
.
Cylinder head nut
22 Nm (2.2 m·kgf, 16 ft·lbf)
T
R
.
.
Cylinder head bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
6
4
1
2
5
3
1
1
2
b
a
1
e
f
c
d
2
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