Yamaha YZ125 2015, Owner'S Service Manual

Page: 81 / 166

4-18
CYLINDER HEAD, CYLINDER AND PISTON
3. Install:
• Nut (cylinder) "1"
Tighten the nuts in stage, using a
crisscross pattern.
4. Install:
• Collar "1"
• Push rod "2"
• Plain washer "3"
• Bolt (push rod) "4"
• Set the collar "5" included in own-
er's tool kit to install the bolt (push
rod).
• Do not forget to remove the collar.
5. Install:
• Gasket (power valve housing)
• Power valve housing "1"
• Bolt (power valve housing) "2"
6. Install:
• O-ring "1"
Apply the lithium soap base grease
on the O-rings.
7. Install:
• Cylinder head "1"
• Copper washer "2"
• Nut (cylinder head) "3"
Tighten the nuts (cylinder head) in
stage, using a crisscross pattern.
8. Install:
• Engine bracket "1"
• Bolt (engine bracket) "2"
• Engine mounting bolt (upper) "3"
9. Install:
• Spark plug "1"
• Spark plug cap "2"
Nut (cylinder):
30 Nm (3.0 m•kg, 22
ft•lb)
Bolt (push rod):
5 Nm (0.5 m•kg, 3.6
ft•lb)
Bolt (power valve hous-
ing):
4 Nm (0.4 m•kg, 2.9
ft•lb)
Nut (cylinder head):
28 Nm (2.8 m•kg, 20
ft•lb)
Bolt (engine bracket):
34 Nm (3.4 m•kg, 24
ft•lb)
Engine mounting bolt
(upper):
34 Nm (3.4 m•kg, 24
ft•lb)
Spark plug:
20 Nm (2.0 m•kg, 14
ft•lb)