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7. CYLINDER HEAD/VALVES ATV 150/125
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 : 0.06 mm (0.0024 in)
EX: 0.08 mm (0.0032 in)
If the stem-to-guide clearance exceeds
the service limits, replace the cylinder
head as necessary.
VALVE SPRING FREE LENGTH
Measure the free length of the inner and
outer valve springs.
Inner : 38.2 mm (1.528 in)
Outer: 44.3 mm (1.772 in)
Measure compressed force (valve spring)
and installed length.
Replace if out of specification.
Service limits:
IN : 7.78.9 kg (at 33.7mm)
EX : 19.522.5 kg (at 38.4mm)
Measure the spring tilt.
Replace if out of specification.
Service limits: IN : 1.7 mm (0.068 IN)
EX : 1.95 mm (0.078)
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