CYLINDER HEAD

ENG

ASSEMBLY AND INSTALLATION Cylinder head

1.Install:

• Dowel pin 1

• Cylinder head gasket 2 New

Timing chain guide (exhaust side) 3

Cylinder head 4

NOTE:

While pulling up the timing chain, install the timing chain guide (exhaust side) and cylinder head.

2.Install:

Washer 1

Cable guide 2

Bolts [L=145 mm (5.71 in)] 3

T.

R.

38 Nm (3.8 m · kg, 27 ft · lb)

Bolts [L=135 mm (5.31 in)] 4

T.

R.

38 Nm (3.8 m · kg, 27 ft · lb)

Nuts 5

T.

R.

10 Nm (1.0 m · kg, 7.2 ft · lb)

NOTE:

Apply the molybdenum disulfide grease on the thread and contact surface of the bolts.

Follow the numerical order shown in the illus- tration. Tighten the bolts and nuts in two stages.

3.Install:

Copper washer 1 New

Oil delivery pipe 2

Union bolt (M8) 3

T.

R.

18 Nm (1.8 m · kg, 13 ft · lb)

Union bolt (M10) 4

T.

R.

20 Nm (2.0 m · kg, 14 ft · lb)

4.Install:

Radiator pipe 1

Bolt (radiator pipe) 2

T.

R.

10 Nm (1.0 m · kg, 7.2 ft · lb)

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Yamaha WR250FM service manual Assembly and Installation Cylinder head