kpw 50 Workshop-manual : Page 61

          6. CYLINDER HEAD/VALVES                                                           K-PIPE 50

 TROUBLESHOOTING
  The poor cylinder head operation can be diagnosed by a compression test or by tracing engine
  top-end noises.


 Poor performance at idle speed                     White smoke from exhaust muffler
  Compression too low                                Worn valve stem or valve guide
                                                     Damaged valve stem oil seal
 Compression too low
  Incorrect valve clearance adjustment              Abnormal noise
  Burned or bend valves                              Incorrect valve clearance adjustment
  Incorrect valve timing                             Sticking valve or broken valve spring
  Broken valve spring                                Damaged or worn camshaft
  Poor valve and seat contact                        Worn cam chain tensioner
  Leaking cylinder head gasket                       Worn camshaft and rocker arm
  Warped or cracked cylinder head
  Poorly installed spark plug

 Compression too high
  Excessive carbon build-up in combustion
  chamber




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