Installing The Cylinder Head - Yamaha YXR70FX Service Manual

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CYLINDER HEAD
EBS00232

INSTALLING THE CYLINDER HEAD

1. Install:
2. Install:
TIP:
_
• Lubricate the threads of the cylinder head
• Lubricate the threads of the cylinder head
3
1
3. Tighten:
1
TIP:
_
Tighten the cylinder head bolts in the proper
tightening sequence as shown and torque
them in two stages.
4. Install:
a
b
M
a. Install the decompressor assembly onto the
b. Turn the crankshaft counterclockwise.
c. Align the "I" mark a on the AC magneto
4
d. Install the timing chain 2 onto the camshaft
e. Make sure the "I" mark c on the camshaft
3
1
4 - 17
• dowel pins
• cylinder head gasket
• cylinder head
• cylinder head bolts
bolts 1 and 2 and mating surface with
molybdenum disulfide grease.
bolts 3 and mating surface with engine oil.
• cylinder head bolts 1:
35 Nm (3.5 m · kg, 25 ft · lb)
• cylinder head bolts 2:
35 Nm (3.5 m · kg, 25 ft · lb)
• cylinder head bolts 3
38 Nm (3.8 m · kg, 27 ft · lb)
• cylinder head bolts 4
10 Nm (1.0 m · kg, 7.2 ft · lb)
• decompressor assembly
• camshaft sprocket
(onto the camshaft)
MMM M MMM M M MMM M M MMM M
camshaft, and then finger tighten the
decompressor assembly bolts 1.
rotor with the stationary pointer b on the
AC magneto cover.
sprocket 3, then the camshaft sprocket
onto the camshaft, and then finger tighten
the camshaft sprocket bolts 4.
sprocket with the stationary pointer d on
the cylinder head.
ENG
New
= 135 mm (5.31 in)
= 145 mm (5.71 in)
M MMM M M MMM M MMM