Yamaha TT-R90, Руководство по эксплуатации для владельца, Страница: 228 / 390

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ENG
VALVES AND VALVE SPRINGS
REMOVAL POINTS
Valve removal
1. Remove:
• Valve cotters
1
NOTE:
Attach a valve spring compressor
2
between
the valve spring retainer and the cylinder head
to remove the valve cotters.
Valve spring compressor:
YM-4019/90890-04019
INSPECTION
Valve
1. Measure:
• Stem-to-guide clearance
Out of specification
→
Replace the valve
guide.
Stem-to-guide clearance =
valve guide inside diameter
a
–
valve stem diameter
b
Clearance (stem to guide):
Intake:
0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
<Limit>: 0.08 mm (0.003 in)
Exhaust:
0.025 ~ 0.052 mm
(0.0010 ~ 0.0020 in)
<Limit>: 0.10 mm (0.004 in)
2. Measure:
• Runout (valve stem)
Out of specification
→
Replace.
Runout limit:
0.02 mm (0.0008 in)