Yamaha YZF-R6 99 Service Manual page 151

VALVES AND VALVE SPRINGS
3. Remove:
S valve cotters 1
NOTE:
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
2 and attachment 3 .
4. Remove:
S upper spring seat 1
S valve spring outer 2
S valve spring inner (intake only) 3
S valve 4
S oil seal 5
S lower spring seat 6
NOTE:
Identify the position of each part very carefully
so that it can be reinstalled in its original place.
EAS00239
CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of the
valves and valve guides.
1. Measure:
S valve-stem-to-valve-guide clearance
Valve-stem-to-valve-guide clearance =
Out of specification ! Replace the valve
guide.
4-23
Valve spring compressor
90890-04019
Attachment
90890-04114
Valve guide inside diameter a –
Valve stem diameter b
Valve-stem-to-valve-guide clea-
rance
Intake
0.010 0.037 mm
<Limit> : 0.08 mm
Exhaust
0.025 0.052 mm
<Limit>: 0.1 mm
ENG