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Ym-4116/90890-04116; Ym-4097/90890-04097; Ym-4117/90890-04117; Ym-4098/90890-04098 - Yamaha WR450F 2003 Manual De Servicio Del Propietario

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VALVES AND VALVE SPRINGS
4 - 36

Valve guide remover:

Intake: 4.5 mm (0.18 in)

YM-4116/90890-04116

Exhaust: 5.0 mm (0.20 in)

YM-4097/90890-04097

Valve guide installer:

Intake:

YM-4117/90890-04117

Exhaust:

YM-4098/90890-04098

Valve guide reamer:

Intake: 4.5 mm (0.18 in)

YM-4118/90890-04118

Exhaust: 5.0 mm (0.20 in)

YM-4099/90890-04099

NOTE:
After replacing the valve guide reface the
valve seat.
3. Inspect:
Valve face
G
Pitting/wear → Grind the face.
Valve stem end
G
Mushroom shape or diameter larger
than the body of the stem → Replace.
4. Measure:
Margin thickness a
G
Out of specification → Replace.
Margin thickness:
Intake:
1.0 mm (0.039 in)
<Limit>: 0.85 mm (0.033 in)
Exhaust:
1.0 mm (0.039 in)
<Limit>: 0.85 mm (0.033 in)
ENG

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