stryker 125 Workshop-manual : Page 92

          7. CYLINDER/PISTON                                                           STRYKER 125/150


 SERVICE INFORMATION
 GENERAL INSTRUCTIONS
 · The cylinder and piston can be serviced with the engine installed in the frame.
 · After disassembly, clean the removed parts and dry them with compressed air before inspection.

 SPECIFICATIONS                                                                    Unit: mm
                                                           Standard            Service Limit
                              Item
                                                        125cc     150cc        125cc 150cc
                       I.D.                            56.556.51 6262.01        56.7      62.2
                       Warpage                                                        
            Cylinder
                       Cylindricity                               0.01               0.05
                       True roundness                             0.01               0.05
                       Ring-to-groove Top                      0.450.7                0.9
                       clearance         Second                0.81.05                1.2
                                         Top                    0.10.3                0.5
            Piston/    Ring end gap Second                      0.10.3                0.5
            piston
            ring                         Oil side rail          0.30.9                1.1
           .           Piston O.D.                     56.4556.48 61.9761.99 56.30 61.81
                       Piston O.D. measuring position           5mm from bottom of skirt
                       Piston-to-cylinder clearance          0.0050.065               0.1
                       Piston pin hole I.D.                15.00215.008             15.06
            Piston pin O.D                                    14.99415              14.90
            Piston-to-piston pin clearance                   0.0010.007              0.01
            Connecting rod small end I.D.                   15.0115.028             15.09


 TROUBLESHOOTING
 · When hard starting or poor performance at low speed occurs, check the crankcase breather for
   white smoke. If white smoke is found, it means that the piston rings are worn, stuck or broken.

 Compression too low                                 Excessive smoke from exhaust muffler
 · Worn, stuck or broken piston rings                · Worn or damaged piston rings
 · Worn or damaged cylinder or piston                · Worn or damaged cylinder or piston

 Compression too high                                Abnormal noisy piston
 · Excessive carbon build-up in combustion           · Worn cylinder, piston or piston rings
   chamber or on piston head                         · Worn piston pin hole or piston pin




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