Yamaha YZF1000RJ Service Manual page 163

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INSPECTION AND REPAIR
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ENG
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\ial
302 017
302017
302 024
4- 29
3.Measure:
• Valve seat width@
Out of specification
➔
Replace.
Valve seat width:
Intake:
0.9 ... 1.1 mm (0.035 ... 0.043 in)
<Limit>: 1.6 mm (0.06 in)
Exhaust:
0.9 ,.. 1.1 mm (0.035 ,.. 0.043 in)
<Limit>: 1.6 mm (0.06 in)
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Measurement steps:
•Apply Mechanic's blueing dye (Dykem) (6)
to 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 pattern.
• Measure the valve seat width. Where the
valve seat and valve face made contact,
blueing will have been removed.
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4.Lap:
• Valve face
• Valve seat
NOTE:
After replacing the valve and valve guide,
the valve seat and valve face should be
lapped.
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Lapping steps:
•Apply a coarse lapping compound @ to
the valve face.
WFl.11·1.~ffiI _______ _
Do not let the compound enter the gap
between the valve stem and the guide.
•Apply molybdenum disulfide oil to the
valve stem .
• Install the valve into the cylinder head.
•Turn the valve until the valve face and
valve seat are evenly polished, then clean
off all of the compound.
NOTE: - - - - - - - - - - - -
For best lapping results, lightly tap the
valve seat while rotating the valve back and
forth between your hands.