Troubleshooting 20 - KTM 50 SX 2019 Owner's Manual

Faults
Engine turns but does not start
Engine has no idle
Possible cause
Operating error
Motorcycle was out of use for a
long time and there is old fuel
in the float chamber
Fuel supply interrupted
Spark plug oily or wet
Electrode distance (plug gap)
of spark plug too wide
Fault in ignition system
Short circuit cable in wiring
harness frayed, kill switch
defective
The connector or ignition coil is
loose or oxidized
Water in carburetor or jets
blocked
Idling jet blocked
Adjusting screws on the carbu-
retor are in turned to the wrong
position
Spark plug defective
Ignition system defective

TROUBLESHOOTING 20

Action
–
Carry out the start procedure.
( p. 23)
–
Empty the carburetor float chamber.
–
Check the fuel tank breather.
–
Clean the fuel tap.
(50 SX)
–
Check/set the carburetor compo-
nents.
(50 SX Mini)
–
Check/set the carburetor compo-
nents.
–
Clean and dry the spark plug, or
change it if necessary.
–
Adjust the plug gap.
Guideline
Spark plug electrode gap
0.60 mm (0.0236 in)
–
Check the ignition system.
–
Check the kill switch.
–
Clean the plug-in connection and treat
it with contact spray.
(50 SX)
–
Check/set the carburetor compo-
nents.
(50 SX Mini)
–
Check/set the carburetor compo-
nents.
(50 SX)
–
Check/set the carburetor compo-
nents.
(50 SX Mini)
–
Check/set the carburetor compo-
nents.
(50 SX)
–
Carburetor - adjust the idle
speed. ( p. 95)
(50 SX Mini)
– Carburetor – adjust the idle
speed. ( p. 96)
–
Change spark plug.
–
Check the ignition coil.
–
Check the spark plug connector.
115