KYMCO MX 125 - Page 87

7. CYLINDER HEAD/VALVES
7-9
MX’er SYSTEM
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
VALVE SPRING FREE LENGTH
Measure the free length of the inner and
outer valve springs.
Inner : 39.4mm replace if below
Outer: 45.5mm replace if below
Measure compressed force (valve spring)
and installed length.
Replace if out of specification.
Service limits:
IN : 7.78.9kg (at 33.7mm)
EX : 19.522.5kg (at 38.4mm)
Measure the spring tilt.
Replace if out of specification.
Service limits: IN : 1.7mm
EX : 1.95mm
If the ste
m
-to-guide clearance exceeds
the service limits, replace the cylinder
head as necessary.
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