Valve And Valve Spring Removal; Valve And Valve Spring Inspection - Yamaha XVS650 Service Manual

VALVES AND VALVE SPRINGS
ENG
VALVE AND VALVE SPRING REMOVAL
1.Check:
• Valve sealing
Leakage at the valve seat
-?
Inspect the
valve face, valve seat and valve seat
width.
Refer to "INSPECTION".
**********************************
Checking steps:
• Pour a clean solvent
CD
into the intake and
exhaust ports.
• Check that the valve seals properly.
There should be no leakage at the valve
seat
0.
**********************************
2.Remove:
• Valve cotters
NOTE:
Attach a valve spring compressor
CD
between the valve spring retainer and the
cylinder head to remove the valve cotters.
Valve spring compressor:
YM~04019, 90890-04019
a
VALVE AND VALVE SPRING INSPECTION
1.Measure:
• Stem-to-guide clearance
Stem..to-guide clearance
=
valve guide inside diameter
® -
valve stem diameter
(6)
Out of specification
-?
Replace the valve
guide.
Clearance (stem to guide):
Intake:
0.010..., 0.037 mm
(0.0004 - 0.015 in)
<Limit>: 0.08 mm (0.003 in)
Exhaust:
0.025 ..., 0.052 mm
(0.001 - 0.002 in)
<Limit>: 0.10 mm (0.004 in)
302001
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