Yamaha FX10X Service Manual page 446

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VALVES AND VALVE SPRINGS

• Upper spring seat 1

• Valve spring 2

• Valve stem seal 4

• Lower spring seat 5

Identify the position of each part very carefully so

that it can be reinstalled in its original place.

• Valve-stem-to-valve-guide clearance

Valve-stem-to-valve-guide clearance =

Valve guide inside diameter a –

Valve stem diameter b

Out of specification → Replace the valve

• Valve guide

To ease valve guide removal and installation, and

to maintain the correct fit, heat the cylinder head to

100 °C (212 °F) in an oven.

Replacement steps:

• Remove the valve guide with the valve guide

• Install the new valve guide with the valve guide

installer 2 and valve guide remover 1.

Valve-stem-to-valve-guide clearance:

0.010 ~ 0.037 mm

(0.0004 ~ 0.0015 in)

<Limit>: 0.080 mm (0.0031 in)

0.025 ~ 0.052 mm

(0.0010 ~ 0.0020 in)

<Limit>: 0.100 mm (0.0039 in)

Valve guide position a:

14.8 ~ 15.2 mm

(0.583 ~ 0.598 in)

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