agility 50 rs naked 2t Workshop-manual : Page 65

          6. CYLINDER HEAD/CYLINDER/PISTON                                        AGILITY RS 50 NAKED



 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.
 ·   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
 Cylinder head warpage                                                               0.10
 Piston O.D.(5mm from bottom of piston skirt)      38.97038.955                     38.90
 Cylinder-to- piston clearance                                                       0.10
 Piston pin hole I.D.                              12.00212.008                     12.03
 Piston pin O.D.                                   11.99412.0                       11.98
 Piston-to-piston pin clearance                                                       
 Piston ring end gap (top/second)                   0.100.25                         0.40
 Connecting rod small end I.D.                     17.00517.017                     17.03
 Cylinder bore                                     39.039.025                       39.05

 TORQUE VALUES
 Cylinder head bolt                 1.51.7kg-m
 Exhaust muffler joint lock nut     1.82.2kg-m
 Exhaust muffler lock bolt          3.03.6kg-m
 Spark plug                         1.11.7kg-m


 TROUBLESHOOTING
 Compression too low, hard starting
 or poor performance at low speed                      Abnormal noisy piston
 · Leaking cylinder head gasket                        · Worn cylinder and piston
 · Loose spark plug                                    · Worn piston pin or piston pin hole
 · Worn, stuck or broken piston and piston rings       · Worn connecting rod small end bearing
 · Worn or damaged cylinder and piston
 Compression too high, overheating
 or knocking                                           Abnormal noisy piston rings
 · Excessive carbon build-up in cylinder head          · Worn, stuck or broken piston rings
   or on piston head                                   · Worn or damaged cylinder


                                                                                              6-2