ck pulsar 125 Werkplaats-Handboek : Bladzijde 19

          1. GENERAL INFORMATION                                                                   Pulsar       CK   125

 POOR PERFORMANCE (ENGINE LACKS POWER)

 Inspection/Adjustment                               Symptom                        Probable Cause
 Start engine and accelerate
 lightly for observation
                                                                                 Clogged air cleaner
                                                                                 Poor fuel flow (Restricted)
                                   Engine speed          Engine speed does not   Clogged fuel tank cap breather hole
                                   increases             increase sufficiently   Clogged exhaust muffler
                                                                                 Carburetor fuel level too low
                                                                                 Clogged carburetor high speed fuel
 Check ignition timing                                                           passage
 using a timing light
                                                                                 Faulty CDI unit
                                       Correct                 Incorrect         Faulty pulser coil

 Check valve clearance
                                                                                 Improper valve clearance
                                       Correct                 Incorrect         adjustment
                                                                                 Excessively worn valve seat
                                                                                 (protruded valve stem)
 Test cylinder compression
                                                                                 Improper valve and seat contact
                                    Normal                 Low compression       Worn cylinder and piston rings
                                    compression                                  Leaking cylinder head gasket
                                                                                 Improper valve timing
 Check carburetor for
 clogging

                                    Not clogged                Clogged           Clean and unclog

 Remove spark plug and
 inspect

                                 Plug not fouled or         Plug fouled or       Fouled spark plug
                                 discolored                 discolored           Incorrect heat range plug
 Check crankcase for oil
 level and condition
                                                            Incorrect or         Oil level too high
                                   Correct and not                               Oil level too low
                                   contaminated             contaminated
                                                                                 Oil not changed
 Check cylinder head for
 oil lubrication

                                Valve train lubricated    Valve train not        Clogged oil line
                                properly                  lubricated properly    Faulty oil pump

 Check for engine overheating
                                                                                 Worn cylinder and piston rings
                                                                                 Mixture too lean
                                   Engine does not         Engine overheats      Poor quality fuel
                                   overheats                                     Excessive carbon buildup in
                                                                                 combustion chamber
                                                                                 Ignition timing too advanced
 Rapidly accelerate or run
 at high speed
                                                                                 Excessive carbon build-up in
                                                                                 combustion chamber
                                Engine does not knock       Engine knocks        Poor quality fuel
                                                                                 Clutch slipping
                                                                                 Mixture too lean
                                                                                 Ignition timing too advanced

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