KTM 450 SX-F EU 2010 Owner's Manual page 74

TROUBLESHOOTING
Faults
Engine has too little power.
Engine stalls or pops back into the
carburetor
Engine overheats.
High oil consumption
Battery discharged
Possible cause
Fuel feed interrupted
Air filter severly contaminated
Exhaust system leaky, deformed or
too little glass fiber yarn filling in
main silencer
Valve clearance too little
Ignition system defective
Lack of fuel
The intake system has an air leak
Too little coolant in cooling system
Insufficient airflow
Radiator fins very dirty
Foam formation in cooling system
Bent radiator hose
Engine vent hose bent
Engine oil level too high
Engine oil too thin (low viscosity)
Piston and cylinder worn
Battery is not charged by generator
Unwanted power consumer
Action
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/set the carburetor components.
–
Clean the air filter. x (
–
Check exhaust system for damage.
–
Change glass fiber yarn filling of main
silencer. ( p. 63)
x
–
Set the valve clearance.
x
–
Check the ignition coil.
x
–
Check the CDI controller.
–
Check the spark plug connector.
–
Check the ignition pulse generator.
–
Check the generator.
x
–
Turn handle of the fuel tap to the ON posi-

tion. (Figure 500178-10
–
Refuel. ( p. 20)
–
Check rubber sleeves and carburetor for tight-
ness.
–
Check the cooling system for leakage.
–
Check the coolant level. (
–
Switch off engine when stationary.
–
Clean radiator fins.
–
Drain the coolant. x (
–
Refill the coolant. (
x
–
Change the radiator hose.
–
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 oil screen. ( p. 68)
x
–
Measure the piston/cylinder mounting clear-
ance.
x
–
Check the charging voltage.
–
Check the generator.
x
–
Check the closed current.
72
x
p. 64)
x
x
x
p. 11)
p. 60)
p. 60)
p. 61)
x
p. 67)
x
x