KTM 50 SX Owner's Manual page 77

19 TROUBLESHOOTING
Faults
Engine has too little power
Engine stalls or is popping into the
carburetor
Engine overheats
White smoke emission (steam in
exhaust gas)
Gear oil exits at the vent hose
Water in the gear oil
Possible cause
Exhaust system leaky, deformed or
too little glass fiber yarn filling in
main silencer
Ignition system defective
Diaphragm or reed valve housing
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 system
Too little air stream
Radiator fins very dirty
Foam formation in cooling system
Damaged cylinder head or cylinder
head gasket
Bent radiator hose
Damaged cylinder head or cylinder
head gasket
Too much gear oil added
Damaged shaft seal ring or water
pump
Action
–
Check exhaust system for damage.
–
Change the glass fiber yarn filling of the main
silencer. x ( p. 37)
–
Check the ignition coil.
–
Check the spark plug connector.
–
Check the diaphragm and reed valve housing.
–
Overhaul the engine.
–
Check the clutch setting.
–
Turn the knurled screw on the fuel tap all the
way counterclockwise.
–
Fill up with fuel. ( p. 19)
–
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. (
x
–
Refill the coolant. (
x
–
Check the cylinder head or cylinder head gas-
ket.
–
Change the radiator hose.
–
Check the cylinder head or cylinder head gas-
ket.
–
Check the gear oil level. (
–
Check the shaft seal ring and water pump.
75
x
x
( p. 65)
x
p. 60)
p. 60)
p. 61)
x
p. 69)