KYMCO MX’er 125 - Cylinder Head Assembly

7. CYLINDER HEAD/VALVES
7
-
9
MX’er SYSTEM
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
CYLINDER HEAD ASSEMBLY
Install the valve spring seats and valve stem
seals.
If the stem
-
to
-
guide clearance exceeds the
service limits, replace the cylinder head as
necessary.
*