KTM 85 SX 2021 Owner's Manual page 115

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
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
Incorrect ignition point due to
loose stator
Damaged cylinder head or
cylinder head gasket
Too much gear oil added
Damaged radial shaft seal ring
or water pump
TROUBLESHOOTING 19
Action
–
Turn handle of the fuel tap to the
ONposition.
–
Refuel. ( p. 29)
–
Check intake flange and carburetor for
tightness.
–
Clean the connector and treat it with
contact spray.
–
Check the cooling system for leaks.
–
Check the coolant level. (
–
Switch off the engine when standing.
–
Clean the radiator fins.
–
Drain the coolant. (
–
Refill with coolant. (
–
Check the cylinder head and cylinder
head gasket.
–
Change the radiator hose.
–
Adjust the ignition.
–
Check the cylinder head and cylinder
head gasket.
–
Check the gear oil level. (
–
Check the radial shaft seal ring and the
water pump.
p. 93)
p. 94)
p. 94)
p. 105)
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