kxr 50 90 Workshop-manual : Page 164

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          11.CRANKCASE/CRANKSHAFT                                 Mongoose/KXR 90/50


 Measure the crankshaft runout.

               Service Limit
          A                      B
      0.100mm                0.150mm
    replace if over        replace if over




 Check the crankshaft bearings for excessive
 play. The bearings must be replaced if they
 are noisy or have excessive play.
                                               Play                    Play




                                                Axial         Radial




 CRANKSHAFT INSTALLATION
 Wash the crankshaft in cleaning solvent and
 then check for cracks or other faults.
 · After check, apply clean engine oil to
     all moving and sliding parts.
   · Remove all gasket material from the
     crankcase mating surfaces. Dress any
     roughness or irregularities with an oil
     stone.




11-9