Yamaha FX10X Service Manual page 454

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VALVES AND VALVE SPRINGS

11. Measure:

• Valve spring free length a

Out of specification → Replace the valve

12. Measure:

• Compressed valve spring force a

Out of specification → Replace the valve

b Installed length

13. Measure:

• Valve spring tilt a

Out of specification → Replace the valve

14. Inspect:

• Valve lifter

Damage/scratches → Replace the valve lift-

ers and cylinder head.

INSTALLATION

• Valve stem end

(with an oil stone)

Valve spring free length (intake and

39.57 mm (1.56 in)

<Limit>: 37.59 mm (1.48 in)

Compressed valve spring force

(installed):

112.30 ~ 129.30 N at 34.60 mm

(11.45 ~ 13.18 kg at 34.60 mm,

25.24 ~ 29.07 lb at 1.36 in)

Maximum valve spring tilt:

2.5°/1.7 mm (2.5°/0.07 in)

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