Yamaha YZ250(R)/LC Owner's Service Manual page 268

CYLINDER HEAD, CYLINDER AND PISTON
4. Install:
9 Spring 1 1
9 Link lever 2
9 Pulley 3
9 Spring 2 4
9 Plain washer 5
9 Valve shaft 6
NOTE:
9 Install the spring 1 to the link lever, and then to
the cylinder.
9 Install the spring 1 with its stopper portion a
facing inward.
9 Apply the molybdnum disulfide oil on the
grooves in the pulleys.
9 Apply the lithium soap base grease on the oil
seal lip.
9 Install the valve shaft with its cut b aligning
with the thrust plate 7, and then rotate the
valve shaft so that its cut faces upward.
5. Install:
9 Valve holder 1 1
9 Bolt (link lever) 2
9 Bolt (pulley) 3
NOTE:
First tighten the bolt (link lever), and then tighten
the bolts (pulleys).
6. Check:
9 Power valve 1 smooth movement
Unsmooth
replace.
4-28
ENG
4 Nm (0.4 m•kg, 2.9 ft•lb)
4 Nm (0.4 m•kg, 2.9 ft•lb)
¡
movement Repair or