Yamaha SR125 1997, Service Manual

Page: 88 / 243

4-8
CYLINDER HEAD
ENG
New
New
22 Nm (2.2 m kg) M8 (1 4)
20 Nm (2.2 m kg) M8 (5 6
NOTE:
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NOTE:
CAUTION:
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SR********
CYLINDER HEAD INSTALLATION
1. Install:
Dowel pins 1
Gasket 2
Gasket (cylinder head) 3
2. Install:
Cylinder head
apply engine oil onto the nut threads.
Tighten the bolts starting with the lowest
numbered one.
3. Install:
Calm sprocket
Timing chain
Installing steps:
Turn the crank shaft counterclockwise until the
slit
1 matches the stationary pointer 2 .
Align the dowel pin 3 on the camshaft with the
stationary pointer 4 on the cylinder head.
Align the “I” mark 5 on the cam sprocket with
the stationary pointer 6 on the cylinder head.
Fit the timing chain
7
onto cam sprocket
8
and install the cam sprocket on the camshaft.
When installing the cam sprocket, keep the tim-
ing chain as tight as possible on the exhaust
side.
Do not turn the crankshaft during installa-
tion of the camshaft. Damage or improper
valve timing will result.
Remove the safety wire from the timing chain.