1. GENERAL INFORMATION                                          DINK50/125


 ENGINE NOISE

                   Symptom         Probable Cause




                                   Valve clearance too large
                  Valve noise
                                   Worn camshaft lobe




                                   Worn piston rings

                  Piston noise     Worn piston pin and connecting rod small end
                                   Excessive carbon build-up in combustion
                                   chamber




                                   Damaged cam chain tensioner
                                   Worn cam gear teeth
                Cam chain noise
                                   Worn or damaged cam chain
                                   Extended cam chain




                                   Faulty crankshaft bearing
                Crankshaft noise
                                   Worn crank pin bearing




                                   Worn or damaged final reduction gears
                  Gear noise
                                   Worn final reduction gear shaft splines




1-39