KTM 400 EXC EU Owner's Manual page 103

TROUBLESHOOTING
Faults
Engine stalls or pops back into the
carburetor
Engine overheats
High oil consumption
Battery discharged
Speedometer values deleted (time,
stop watch, lap times)
Possible cause
The intake system has an air leak
Coolant level low in cooling system
Insufficient airflow
Radiator fins very dirty
Foam formation in cooling system
Bent radiator hose
Thermostat defective
Defect in radiator fan system
(EXC SIX DAYS, XC‑W SIX DAYS)
Engine vent hose bent
Engine oil level too high
Engine oil too thin (low viscosity)
Piston and/or cylinder worn
Battery is not charged by alternator
Undesired power consumer
The battery in the speedometer is
discharged
Action
–
Check rubber sleeves and carburetor for tight-
ness.
–
Check the cooling system for leaks.
–
Check the coolant level. (
–
Switch off engine when stationary.
–
Clean radiator fins.
–
Drain the coolant. x (
–
Refill the coolant. x (
–
Change the radiator hose.
–
Check the thermostat. x
Guideline
Opening temperature: 70 °C (158 °F)
–
Check the radiator fan fuse.
–
Check the radiator fan.
x
–
Check the thermostat.
x
–
Route the vent hose without bends or replace it
if necessary.
–
Check the engine oil level. (
–
Change the engine oil and oil filter and clean
the engine oil screen. x
–
Piston/cylinder - determine the mounting clear-
ance x
–
Check the charging voltage.
–
Alternator - check the light and battery wind-
ing. x
–
Check the closed current.
–
Change the speedometer battery. (
101
p. 84)
p. 85)
p. 85)
x
p. 91)
( p. 91)
x
x
p. 82)