6. 4-STROKE: CYLINDER HEAD/VALVES VITALITY 50
CYLINDER HEAD DISASSEMBLY
Remove the valve spring cotters, retainers, Valve Cotter Retainer Springs Springs Seat
springs, spring seats, oil seals and valves
using a valve spring compressor.
· Be sure to compress the valve springs
with a valve spring compressor.
· Mark all disassembled parts to ensure
correct reassembly.
Special
Valve Spring Compressor E040
Spring Compressor Oil Seal Valve
VALVE/VALVE GUIDE INSPECTION
Inspect each valve for bending, burning,
scratches or abnormal stem wear.
If any defects are found, replace the valve
with a new one.
Check valve movement in the guide.
Measure each valve stem O.D.
Measure each valve guide I.D.
Subtract each valve stem O.D. from the
corresponding guide I.D. to obtain the stem-
to-guide clearance.
Service limits: IN : 0.06mm replace if over
EX: 0.08mm replace if over
If the stem-to-guide clearance exceeds
the service limits, replace the cylinder
head as necessary.
CYLINDER HEAD INPECTION
Check the spark plug hole and valve areas
for cracks.
Check the cylinder head for warpage with a
straight edge and feeler gauge.
Service Limit: 0.05mm repair or replace if
over
6-11
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