kpw 50 Workshop-manual : Page 66

          6. CYLINDER HEAD/VALVES                                                        K-PIPE 50
Measure each valve guide I.D.
  Service Limits: IN: 5.00mm replace if over
                  EX: 5.00mm replace if over
  Subtract each valve stem O.D. from the
  corresponding guide I.D. to obtain the
  stem-to-guide clearance.
  Service Limits: IN: 0.10mm replace if over
                   EX: 0.10mm replace if over
  If the stem-to-guide clearance exceeds
     the service limits, replace the guides as
     necessary. Reface the valve seats
     whenever the valve guides are replaced.



  CYLINDER HEAD ASSEMBLY                            Valve       Outer Spring   Inner Spring

  Install new valve stem seals when
     assembling.

  Lubricate each valve stem with oil.
  Insert the valves into the valve guides.




                                                    Stem Seal   Retainer       Valve Cotters

  Install the valve spring seats and valve stem
  seals.
  Be sure to install new valve stem seals.
  Apply engine oil to the inside of the valve
  stem seals and insert the valves into the valve
  guides.
  Install the valve springs and retainers.
  Compress the valve springs using the valve
  spring compressor, then install the valve
  cotters.
   When assembling, a valve spring
      compressor must be used.
      Install the cotters with the pointed ends
      facing down from the upper side of the
      cylinder head.
  Special Tool
  Valve Spring Compressor




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