Yamaha YZ250(W)/W1 Owner's Service Manual page 256

CYLINDER HEAD, CYLINDER AND PISTON
EC478100
PISTON AND POWER VALVE
6 Nm (0.6 m•kg, 4.3 ft•lb)
4 Nm (0.4 m•kg, 2.9 ft•lb)
Extent of removal:
Extent of removal
1
2
4 Nm (0.4 m•kg, 2.9 ft•lb)
1 Piston and piston ring removal
Order Part name
PISTON AND POWER VALVE
REMOVAL
1 Piston pin clip
2 Piston pin
3 Piston
4 Small end bearing
5 Piston ring
6 Power valve cover
7 Side holder
8 Thrust plate
9 Bolt
10 Valve holder 1
11 Valve shaft
12 Link lever
13 Pulley
14 Link rod
15 Power valve 2
16 Valve holder 2
17 Power valve 1
4 Nm (0.4 m•kg, 2.9 ft•lb)
2 Power valve removal
Q'ty

2

1 

1 Refer to "REMOVAL POINTS".

1

2 
1
2
1
3
1
1
1
2
1
2
1
1
4-19
ENG
4 Nm (0.4 m•kg, 2.9 ft•lb)
Remarks