KTM 300 EXC Owner's Manual page 121

21 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
Possible cause
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
Incorrect ignition point due to loose
stator
Damaged cylinder head or cylinder
head gasket
Too much gear oil added
Damaged shaft seal ring or water
pump
Action
–
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. (
–
Refill with coolant. (
–
Check the cylinder head and cylinder head gas-
ket.
–
Change the radiator hose.
(All 125 models)
–
Adjust the ignition.
–
Check the cylinder head and cylinder head gas-
ket.
–
Check the gear oil level. (
–
Check the shaft seal ring and water pump.
119
p. 103)
p. 103)
p. 104)
p. 111)