Yamaha FX10X Service Manual page 444

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VALVES AND VALVE SPRINGS

The following procedure applies to all of the valves

and related components.

Before removing the internal parts of the cylinder

head (e.g., valves, valve springs, valve seats),

make sure the valves properly seal.

• Valve lifter 1

• Valve pad 2

Make a note of the position of each valve lifter and

valve pad so that they can be reinstalled in their

original place.

(for leakage)

Leakage at the valve seat → Check the valve

face, valve seat, and valve seat width.

Inspection steps:

• Pour a clean solvent a into the intake and

exhaust ports.

• Check that the valves properly seal.

There should be no leakage at the valve seat 1.

• Valve cotters

Remove the valve cotters by compressing the valve

spring with the valve spring compressor 1 and

valve spring compressor attachment 2.

Valve spring compressor:

90890-04019, YM-04019

Valve spring compressor attach-

Valve spring compressor adapter

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