Yamaha YZ250(W)/W1, Owner'S Service Manual

Page: 280 / 596

4-31
CYLINDER HEAD, CYLINDER AND PISTON
ENG
4. Install:
9 Push rod
1
9 Bolt (push rod)
2
NOTE:
9 Insert the set pin
3
included in owner’s tool kit
to install the bolt (push rod).
9 Do not forget to remove the set pin.
c C
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:
9 Gasket (power valve housing)
9 Power valve housing
1
9
Bolt (power valve housing)
2
6. Install:
9
O-ring 1
9 Dowel pin
2
NOTE:
Apply the lithium soap base grease on the O-
rings.
7. Install:
9 Cylinder head
1
9 Copper washer
2
9 Nut (cylinder head)
3
NOTE:
Tighten the nuts (cylinder head) in stage, using a
crisscross pattern.
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)
1P8-9-32-4b 4/6/06 2:12 PM Page 8