Yamaha YZF-R1P Service Manual page 262

VALVES AND VALVE SPRINGS
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3. Eliminate:
• carbon deposits
(from the valve face and valve seat)
4. Check:
• valve face
Pitting/wear → Grind the valve face.
• valve stem end
Mushroom shape or diameter larger than
the body of the valve stem → Replace the
valve.
5. Measure:
• valve margin thickness a
Out of specification → Replace the valve.
6. Measure:
• valve stem runout
Out of specification → Replace the valve.
NOTE:
_
• When installing a new valve, always replace
the valve guide.
• If the valve is removed or replaced, always
replace the oil seal.
5 - 26
ENG
Valve guide remover
Intake (4.0 mm, 0.16 in)
90890-04111
Exhaust (4.5 mm, 0.18 in)
YM-4116
Valve guide installer
Intake (4.0 mm, 0.16 in)
90890-04112
Exhaust (4.5 mm, 0.18 in)
YM-4117
Valve guide reamer
Intake (4.0 mm, 0.16 in)
90890-04113
Exhaust (4.5 mm, 0.18 in)
YM-4118
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Valve margin thickness
0.5 ~ 0.9 mm (0.0197 ~ 0.0354 in)
Valve stem runout
0.01 mm (0.0004 in)
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