Yamaha FX10X Service Manual page 450

Hide thumbs Also See for FX10X:

VALVES AND VALVE SPRINGS

• Valve stem runout

Out of specification → Replace the valve.

• When installing a new valve, always replace the

valve guide.

• If the valve is removed or replaced, always

replace the valve stem seal.

7. Eliminate:

• Carbon deposits

(from the valve face and valve seat)

• Valve seat

Pitting/wear → Replace the cylinder head.

• Valve seat width a

Out of specification → Replace the cylinder

Measurement steps:

• Apply Mechanic's blueing dye (Dykem) 1 onto

the valve face.

• Install the valve into the cylinder head.

• Press the valve through the valve guide and

onto the valve seat to make a clear impression.

• Measure the valve seat width.

Where the valve seat and valve face contacted one

another, the blueing will have been removed.

Valve stem runout:

0.010 mm (0.0004 in)

Valve seat width:

0.90 ~ 1.10 mm

(0.0354 ~ 0.0433 in)

<Limit>: 1.6 mm (0.0630 in)

0.90 ~ 1.10 mm

(0.0354 ~ 0.0433 in)

<Limit>: 1.6 mm (0.0630 in)

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