KTM 50 SX 2020 Owner's Manual page 123

Faults
Engine does not speed up
Engine has too little power
Engine stalls or is popping into
the carburetor
Engine overheats
Possible cause
The carburetor is flowing over
because the float needle is
dirty or worn
Loose carburetor jets
Fault in ignition system
Fuel supply interrupted
Air filter very dirty
Exhaust system leaky,
deformed or too little glass
fiber yarn filling in main
silencer
Ignition system defective
Diaphragm or reed valve hous-
ing damaged
Noticeable wear
Clutch engagement speed too
low or too high
Lack of fuel
Engine takes in bad air
The connector or ignition coil is
loose or oxidized
Too little coolant in cooling sys-
tem
Too little air stream
Radiator fins very dirty
Foam formation in cooling sys-
tem
Damaged cylinder head or
cylinder head gasket
TROUBLESHOOTING 20
Action
(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.
–
Check the ignition system.
–
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 the air filter and air filter box.
( p. 58)
–
Check exhaust system for damage.
–
Change the glass fiber yarn filling of
the main silencer. (
–
Check the ignition coil.
–
Check the spark plug connector.
–
Check the diaphragm and reed valve
housing.
–
Overhaul the engine.
–
Check the clutch setting.
( p. 102)
–
Turn the knurled screw on the fuel tap
all the way counterclockwise.
–
Fill up with fuel. ( p. 25)
–
Check the intake flange and carburetor
for tightness.
–
Clean the plug-in connection and treat
it with contact spray.
–
Check the cooling system for leakage.
–
Check the coolant level. (
–
Switch off engine when standing.
–
Clean radiator fins.
–
Drain the coolant. (
–
Refill with coolant. (
–
Check the cylinder head or cylinder
head gasket.
p. 59)
p. 95)
p. 95)
p. 96)
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