stryker 125 Workshop-manual : Page 73

          6. CYLINDER HEAD/VALVES                                                       STRYKER 125/150


 SERVICE INFORMATION
 GENERAL INSTRUCTIONS
 · The cylinder head, cylinder and piston can be serviced with the engine installed in the frame.
 · Before disassembly, clean the engine to prevent dust from entering the engine.
 · When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable
   parts, valve arm and camshaft sliding surfaces for initial lubrication.
 · The valve rocker arm is lubricated with engine oil through the cylinder head engine oil passages.
   Clean and unclog the oil passages before cylinder head assembly.
 · Remove all gasket material from the mating surfaces.
 · Do not use a driver to pry between the cylinder and cylinder head, cylinder and crankcase.
 · Do not damage the cylinder inside and the piston surface.
 · After disassembly, clean the removed parts before inspection. When assembling, apply the
   specified engine oil to movable parts.

 SPECIFICATIONS                                   Standard (mm)              Service Limit (mm)
                   Item                     DA25AA           DA30AA         DA25AA DA30AA
                               IN              0.08            0.08                         
 Valve clearance (cold)
                               EX              0.08            0.08                         
 Cylinder head compression pressure         13 kg/cm        16 kg/cm                        
 Cylinder head warpage
                               IN             31.80         31.80              31.40        31.40
 Camshaft cam height
                               EX             31.54         31.54             31.140       31.140
                               IN          12.0~12.018   12.0~12.018           12.10        12.10
 Valve rocker arm I.D.
                               EX          12.0~12.018   12.0~12.018           12.10        12.10
 Valve rocker arm shaft        IN         11.977~11.995 11.977~11.995         11.910       11.910
 O.D.                          EX         11.977~11.995 11.977~11.995         11.910       11.910
                               IN              1.0           1.0                1.80         1.80
 Valve seat width
                               EX              1.0           1.0                1.80         1.80
                               IN          5.450~5.465   5.450~5.465           5.370        5.370
 Valve stem O.D.
                               EX          5.430~5.445   5.430~5.445           5.370        5.370
                               IN          5.475~5.485   5.475~5.485           5.780        5.780
 Valve guide I.D.
                               EX          5.475~5.485   5.475~5.485           5.780        5.780
 Valve stem-to-guide           IN          0.010~0.035   0.010~0.035           0.080        0.080
 clearance                     EX          0.040~0.055   0.040~0.055            0.10         0.10




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