Yamaha YZF-R1 (2006) [228/426] Valves and valve springs

Yamaha YZF-R1 (2006) [228/426] Valves and valve springs
VALVES AND VALVE SPRINGS
5-25
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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.
EAS24300
CHECKING THE VALVE SEATS
The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
Carbon deposits
(from the valve face and valve seat)
2. Check:
•Valve seat
Pitting/wear Replace the cylinder head.
3. Measure:
Valve seat width “a”
Out of specification Replace the cylinder
head.
Valve guide remover (ø4.5)
90890-04116
Valve guide remover (4.5 mm)
YM-04116
Valve guide remover (ø5)
90890-04097
Valve guide remover (5.0 mm)
YM-04097
Valve guide installer (ø4.5)
90890-04117
Valve guide installer (4.5 mm)
YM-04117
Valve guide installer (ø5)
90890-04098
Valve guide installer (5.0 mm)
YM-04098
Valve guide reamer (ø4.5)
90890-04118
Valve guide reamer (4.5 mm)
YM-04118
Valve guide reamer (ø5)
90890-04099
Valve guide reamer (5.0 mm)
YM-04099
Valve margin thickness
Valve margin thickness D
(intake)
1.10–1.50 mm (0.0433–0.0591
in)
Valve margin thickness D
(exhaust)
0.50–0.90 mm (0.0197–0.0354
in)
Valve stem runout
Valve stem runout
0.010 mm (0.0004 in)

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