stryker 125 Workshop-manual : Page 74

          6. CYLINDER HEAD/VALVES                                                    STRYKER 125/150

 TORQUE VALUES
 Cylinder head cover nut          1.21.6kg-m
 Cylinder head nut                2.0kg-m
 Valve clearance adjusting nut    0.9kg-m
 Exhaust muffler joint lock nut   1.82.5kg-m
 Exhaust muffler lock bolt        3.03.6kg-m
 Spark plug                       1.11.7kg-m

 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                        Abnormal noise
 · Compression too low                                 · Incorrect valve clearance adjustment
 Compression too low, hard starting                    · Sticking valve or broken valve spring
 or poor performance at low speed                      · Damaged or worn camshaft
 · Leaking cylinder head gasket                        · Worn cam chain guide
 · Loose spark plug                                    · Worn camshaft and rocker arm
 · Worn, stuck or broken piston and piston rings         Abnormal noisy piston
 · Worn or damaged cylinder and piston                   · Worn cylinder and piston
 Compression too high, overheating or knocking          · Worn piston pin or piston pin hole
 · Excessive carbon build-up in cylinder head          · Worn connecting rod small end bearing
   or on piston head                                    Abnormal noisy piston rings
 · Worn cylinder and piston                              · Worn, stuck or broken piston rings
 · Incorrectly installed piston rings                      · Worn or damaged cylinder
 · Damaged cylinder and piston
 White smoke from exhaust muffler
 · Worn valve stem or valve guide
 · Damaged valve stem seal




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