Yamaha YZ 2018 Series, Owner'S Service Manual

Page: 218 / 402

CYLINDER HEAD
5-21
EASB29B221
INSTALLING THE CYLINDER HEAD
1. Install:
• Timing chain guide (intake side) “1”
• Dowel pin “2”
• Cylinder head gasket “3”
• Cylinder head “4”
TIP
• Install the cylinder head gasket with its char-
acter stamp “a” rearward of the vehicle as
shown.
• While pulling up the timing chain, install the
timing chain guide (intake side) and the cylin-
der head.
2. Install:
• Washer “1”
• Cylinder head bolt “2”
• Cylinder head nut “3”
TIP
Apply molybdenum disulfide grease to the
threads and contact surfaces of the bolts and to
both contact surfaces of the washers.
3. Tighten:
• Cylinder head bolt “1” – “4”
• Cylinder head nut “5”, “6”
TIP
Tighten the bolts and nuts to the specified
torque in two or three steps in the proper tight-
ening sequence as shown.
Cylinder head bolt “1” – “4”
33 N·m (3.3 kgf·m, 24 lb·ft)
Cylinder head nut “5”, “6”
10 N·m (1.0 kgf·m, 7.4 lb·ft)
New
1
2
2
4
3
a
1
3
2
2
T
R
.
.
1
5
6
4
2
3
FWD
x2 x4