KTM 50 SX 2020, Owner'S Manual

Page: 122 / 141

20 TROUBLESHOOTING
120
Faults Possible cause Action
Engine turns but does not start Operating error
–
Carry out the start procedure.
(
p. 22)
Motorcycle was out of use for a
long time and there is old fuel
in the float chamber
–
Empty the carburetor float chamber.
Fuel supply interrupted
–
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.
Spark plug oily or wet
–
Clean and dry the spark plug, or
change it if necessary.
Plug gap of spark plug too wide
–
Adjust plug gap.
Guideline
Spark plug electrode gap
0.60 mm (0.0236 in)
Fault in ignition system
–
Check the ignition system.
Short circuit cable in wiring
harness frayed, kill switch
defective
–
Check the kill switch.
The connector or ignition coil is
loose or oxidized
–
Clean the plug-in connection and treat
it with contact spray.
Water in carburetor or jets
blocked (50 SX)
–
Check/set the carburetor compo-
nents.
(50 SX Mini)
–
Check/set the carburetor compo-
nents.
Engine has no idle speed Idling jet blocked
(50 SX)
–
Check/set the carburetor compo-
nents.
(50 SX Mini)
–
Check/set the carburetor compo-
nents.
Adjusting screws on the carbu-
retor are in turned to the wrong
position (50 SX)
–
Carburetor - adjust the idle
speed.
( p. 100)
(50 SX Mini)
–
Carburetor
–
adjust the idle
speed. ( p. 101)
Spark plug defective
–
Change spark plug.
Ignition system defective
–
Check the ignition coil.
–
Check the spark plug connector.