Cylinder Head, Cylinder And Piston - Yamaha YZ250(S)/LC Owner's Service Manual

CYLINDER HEAD, CYLINDER AND PISTON

EC470000
CYLINDER HEAD, CYLINDER AND PISTON
EC478000
CYLINDER HEAD AND CYLINDER
5 Nm (0.5 m•kg, 3.6 ft•lb)
5 Nm (0.5 m•kg, 3.6 ft•lb)
Extent of removal:
Extent of removal
Preparation for
removal
1
2
34 Nm (3.4 m•kg, 24 ft•lb)
69 Nm (6.9 m•kg, 50 ft•lb)
20 Nm (2.0 m•kg, 14 ft•lb)
1 Cylinder head removal
Order Part name
CYLINDER HEAD AND
CYLINDER REMOVAL
Seat and fuel tank
Exhaust pipe and silencer
Radiator hose 1
Carburetor
1 Spark plug
2 Engine bracket
3 Nut (cylinder head)
4 Cylinder head
5 Power valve housing
6 Push rod
7 Nut (cylinder)
8 Cylinder
2 Cylinder removal
Q'ty
Refer to "SEAT, FUEL TANK AND
SIDE COVERS" section.
Refer to "EXHAUST PIPE AND
SILENCER" section.
Disconnect at cylinder head side.
Refer to "CARBURETOR AND REED
VALVE" section.
1
2
6 Loosen each nut 1/4 turn, and remove
them after all nuts are loosened.
1
1
1 Refer to "REMOVAL POINTS".
4
1
4-18
ENG
25 Nm (2.5 m•kg, 18 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
42 Nm (4.2 m•kg, 30 ft•lb)
10 Nm (1.0 m•kg, 7.2 ft•lb)
Remarks