mxer mxu 150 Workshop-manual : Page 112

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Page 111

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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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