Installing The Cylinder Head - Yamaha YZ250F 2016 Owner's Service Manual

INSTALLING THE CYLINDER HEAD

EAS1SM9216
1. Install:
• Timing chain guide (intake side) "1"
• Dowel pins "2"
• Cylinder head gasket "3"
• Dowel pins "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
3
1
2. Install:
• Cylinder head "1"
• Cylinder head bolt "2"
• Cylinder head nut "3"
2
3. Tighten:
• Cylinder head bolt "1" – "4"
• Cylinder head nut "5", "6"
Cylinder head bolt "1" – "4"
33 Nm (3.3 m·kgf, 24 ft·lbf)
Cylinder head nut "5", "6"
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
New
a
4
2
2
1
3
5-21
CYLINDER HEAD
TIP
• Apply molybdenum disulfide grease to the
threads and contact surfaces of the bolts and
to both contact surfaces of the washers.
• Tighten the bolts and nuts to the specified
torque in two or three steps in the proper tight-
ening sequence as shown.
x2 x4
1
5
6
4
FWD
3
2