dinkstreet 125 Manuel atelier : Page 73

          6. CYLINDER HEAD/VALVES                                                       DOWNTOWN 125i



 SERVICE INFORMATION
 GENERAL INSTRUCTIONS
 · The cylinder head can be serviced with the engine installed in the frame. Coolant in the radiator
   and water jacket must be drained first.
 · When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable
   parts and valve arm sliding surfaces for initial lubrication.
 · The valve rocker arms are lubricated by engine oil through the cylinder head engine oil passages.
   Clean and unclog the oil passages before assembling the cylinder head.
 · After disassembly, clean the removed parts and dry them with compressed air before inspection.
 · After removal, mark and arrange the removed parts in order. When assembling, install them in
   the reverse order of removal.


 SPECIFICATIONS                                                                            Unit: mm
                     Item                                             Standard
 Valve clearance (cold)            IN           0.1
                                   EX           0.1
 Cylinder head compression pressure             15kg/cm


 Cylinder head warpage                                                   
                                   IN           25.965
 Camshaft cam height               EX           25.810
                                   IN           10.0~10.015
 Valve rocker arm I.D.             EX           10.0~10.015
 Valve rocker arm shaft            IN           9.972~9.987
 O.D.                              EX           9.972~9.987
                                   IN           4.975~4.970
 Valve stem O.D.                   EX           4.975~4.970
                                   IN           5.0~5.012
 Valve guide I.D.                  EX           5.0~5.012
 Valve stem-to-guide               IN           0.010~0.037
 clearance                         EX           0.030~0.057




 TORQUE VALUES
 Cylinder head cover bolt               0.8~0.9 kgf-m
 Tensioner mounting bolt                0.9 kgf-m
 Tensioner sealing bolt                 0.9 kgf-m


 Cylinder head cap nut                  2 kgf-m
                                                                 Apply engine oil to threads
 Cylinder head bolt                     0.7~1.1   kgf-m




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