kxr maxxer 250 300 Werkstatthandbuch : Seite 25

          1. GENERAL INFORMATION                                                                  ATV 300/250


 TROUBLESHOOTING
 ENGINE WILL NOT START OR IS HARD TO START


 Inspection/Adjustment                         Symptom                   Probable Cause

 Check if fuel reaches
 carburetor by loosening
 drain screw                                                           Empty fuel tank
                                                                       Clogged fuel line between fuel
                                                                       tank and carburetor
                                                    Fuel does not      Clogged float oil passage
                                Fuel reaches                           Clogged fuel tank cap breather
                                carburetor          reach carburetor   hole
                                                                       Clogged fuel filter
                                                                       Clogged fuel valve passage
 Remove spark plug and
 install it into spark plug
 cap to test spark by                                                  Faulty spark plug
 connecting it to engine                                               Fouled spark plug
 ground                                                                Faulty ignition unit
                                                                       Faulty change gear control unit
                                Spark jumps        Weak or no spark    Faulty pulser coil
                                                                       Broken or shorted ignition coil
                                                                       Broken or shorted exciter coil
                                                                       Faulty ignition switch
                                                                       Weak or dead battery
 Test cylinder
 compression
                                                                       Faulty starter clutch
                                                                       Valve clearance too small
                                                                       Valve stuck open
                                Normal                   Low or no     Worn cylinder, piston and piston
                                compression              compression   rings
                                                                       Leaking cylinder head gasket

 Start engine by follow-
 ing normal starting
 procedure
                                                                       Air leaking through intake pipe
                              Engine does not       Engine fires but   Leaking intake manifold
                              fire                  does not start     Incorrect ignition timing
                                                                       Incorrectly adjusted air screw


 Remove spark plug and
 inspect again

                                                                       Flooded carburetor
                               Dry spark plug        Wet spark plug    Clogged air cleaner
                                                                       Throttle valve excessively open




1-21