KTM 450 EXC RACING 2006, Owner'S Manual

Page: 85 / 111

TROUBLESHOOTING
83
Faults Possible cause Action
Engine has too little power. Air filter very dirty
–
Clean the air filter. x ( p. 73)
Exhaust system leaky, deformed or
too little glass fiber yarn filling in
main silencer
–
Check exhaust system for damage.
–
Change glass fiber yarn filling of main
silencer.
x
Valve clearance too little
–
Adjust the valve clearance.
x
Ignition system defective
–
Check the ignition coil. x
–
Check the CDI unit.
x
–
Check the spark plug connector. x
–
Check the ignition pulse generator.
x
–
Check the generator. x
Engine stalls or is popping into the
carburetor Lack of fuel
–
Turn handle

of the fuel tap to the ON posi-
tion. (Figure 500137-10 p. 19)
–
Fill up with fuel. ( p. 27)
Engine takes in bad air
–
Check rubber sleeves and carburetor for tight-
ness.
Engine overheats. Too little coolant in cooling system
–
Check the cooling system for leakage.
–
Check the coolant level. ( p. 70)
Too little air stream
–
Switch off engine when standing.
Radiator fins very dirty
–
Clean radiator fins.
Foam formation in cooling system
–
Drain the coolant. x ( p. 71)
–
Refill the coolant.
x
( p. 71)
Bent radiator hose
–
Change the radiator hose.
x
Thermostat defective
–
Check the thermostat.
x
Guideline
Opening temperature: 70 °C (158 °F)
High oil consumption Engine vent hose bent
–
Route the vent hose without bends or replace it
if necessary.
Engine oil level too high
–
Check the engine oil level. ( p. 77)
Engine oil too thin (low viscosity)
–
Change the engine oil and oil filter and clean
the engine oil screen.
x
( p. 77)
Piston and/or cylinder worn
–
Piston/cylinder - determine the mounting clear-
ance
x
Battery discharged The battery does not charge
–
Check the charging voltage.
x
–
Check the charging current.
x
–
Check the generator.
x
Undesired power consumer
–
Check the closed current.
x
Speedometer values deleted (time,
stop watch, lap times) The battery in the speedometer is
empty.
–
Change the battery in the speedometer.