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

Page: 272 / 596

4-27
ENG
CYLINDER HEAD, CYLINDER AND PISTON
EC475000
ASSEMBLY AND INSTALLATION
EC475193
Power valve
1. Install:
9 Power valve 1
1
9 Valve holder 2
2
9 Bolt (valve holder 2)
3
NOTE:
9
Install the power valve 1 with its gouge
a
fac-
ing upside.
9 Apply the molybdenum disulfide oil on the
power valve 1.
2. Install:
9
Power valve 2
1
9 Link rod
2
9 Plain washer
3
9 Screw (link rod)
4
NOTE:
Install the link rod with the cuts
a
in its arm
ends fitting over the pins
b
on the power valves
2.
3. Install:
9 Thrust plate
1
9 Screw (thrust plate)
2
NOTE:
Be sure to install the thrust plate to the cylinder
before installing the valve shaft.
6 Nm (0.6 m•kg, 4.3 ft•lb)
6 Nm (0.6 m•kg, 4.3 ft•lb)
6 Nm (0.6 m•kg, 4.3 ft•lb)
1P8-9-32-4a 4/10/06 1:53 PM Page 54