Yamaha YZ250(N)/LC Owner's Service Manual page 270

CYLINDER HEAD, CYLINDER AND PISTON
4. Install:
9Push rod 1
9Bolt (push rod) 2
NOTE:
9Insert the set pin 3 included in owner's tool kit
to install the bolt (push rod).
9Do not forget to remove the set pin.
cC
Be sure to use the set pin. If the set pin is
not used, the power valve constituent parts
will result in damage.
5. Install:
9Gasket (power valve housing)
9Power valve housing 1
9Bolt (power valve housing) 2
6. Install:
9O-ring 1
9Dowel pin 2
NOTE:
Apply the lithium soap base grease on the O-
rings.
7. Install:
9Cylinder head 1
9Copper washer 2
9Nut (cylinder head) 3
NOTE:
Tighten the nuts (cylinder head) in stage, using a
crisscross pattern.
4-30
ENG
5 Nm (0.5 m•kg, 3.6 ft•lb)
5 Nm (0.5 m•kg, 3.6 ft•lb)
25 Nm (2.5 m•kg, 18 ft•lb)