KTM 250 SX 2022 Owner's Manual page 118

19 TROUBLESHOOTING
Faults
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
116
Possible cause
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
Bent radiator hose
Damaged cylinder head or
cylinder head gasket
Too much gear oil added
Damaged radial shaft seal ring
or water pump
Action
–
Turn tap handle of the fuel tap to the
ON position.
–
Refuel. ( p. 30)
–
Check the intake flange and carburetor
for tightness.
–
Clean the connector and treat it with
contact spray.
–
Check the cooling system for leakage.
–
Check the coolant level. (
–
Switch off engine when stationary.
–
Clean the radiator fins.
–
Drain the coolant. ( p. 94)
–
Refill with coolant. (
–
Check the cylinder head and cylinder
head gasket.
–
Change the radiator hose.
–
Check the cylinder head and cylinder
head gasket.
–
Check the gear oil level. (
–
Check the radial shaft seal ring and the
water pump.
p. 94)
p. 95)
p. 108)