Checking The Valves And Valve Guides - Yamaha YZF-R1K Service Manual

4
VALVES AND VALVE SPRINGS
3. Remove:
• valve cotters 1
NOTE:
Remove the valve cotters by compress-
ing the valve spring with the valve spring
compressor 2 and attachment 3.
4. Remove:
• upper spring seat 1
• valve spring 2
• valve 3
• oil seal 4
• lower spring seat 5
NOTE:
Identify the position of each part very
carefully so that it can be reinstalled in
its original place.
EB403400
CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of
the valves and valve guides.
1. Measure:
• valve-stem-to-valve-guide clearance
Out of specification → Replace the
valve guide.
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ENG
Valve spring compressor
YM-04019
Attachment
(for the intake valve)
YM-4114
(for the exhaust valve)
YM-4108
Valve-stem-to-valve-guide clearance =
Valve guide inside diameter a –
Valve stem diameter b
Valve-stem-to-valve-guide
clearance
Intake
0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
<Limit>: 0.08 mm (0.0031 in)
Exhaust
0.025 ~ 0.052 mm
(0.0006 ~ 0.0020 in)
<Limit>: 0.1 mm (0.004 in)