Checking The Decompression System; Installing The Cylinder Head - Yamaha YZF-R125 Service Manual

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c. 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.
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EAS5D71009

CHECKING THE DECOMPRESSION SYSTEM

1. Check:
• Decompression system
M MMM M MMM M M MMM M
a. Check the decompression system with the
camshaft sprocket and the decompression
cam installed to the camshaft.
b. Check that the decompression lever "1"
moves smoothly.
c. Without operating the decompression lever,
check that the decompression cam "2"
projects from the camshaft (exhaust cam) as
shown in the illustration "A".
d. Move the decompression lever "1" in the di-
rection of the arrow shown and check that the
decompression cam does not project from
the camshaft (exhaust cam) as shown in the
illustration "B".
1
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M MMM M M MMM M M MMM M
A
B
LLL
MMM
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EAS24230

INSTALLING THE CYLINDER HEAD

1. Install:
• Cylinder head
NOTE:
Pass the timing chain through the timing chain
cavity.
2. Tighten:
• Cylinder head bolts "1"
• Cylinder head bolts "2"
NOTE:
• Lubricate the cylinder head bolts and washers
with engine oil.
• Tighten the cylinder head bolts in the proper
tightening sequence as shown and torque
them in two stages.
5-11
CYLINDER HEAD
2
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Cylinder head bolt
22 Nm (2.2 m·kg, 16 ft·lb)
Cylinder head bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
2
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