KTM 525 XC ATV 2008 Owner's Manual page 80

TROUBLESHOOTING
Faults
The engine cannot be cranked (electric
starter).
Engine does not speed up.
Engine has no idle.
Engine stalls or is popping into the carbu-
retor.
Engine overheats.
Engine has too little power.
High oil consumption
Parts of the electrical system are not
functional.
Battery discharged
Possible cause
Operating error
Battery discharged
Main fuse burned out
Low external temperature
Carburetor running over because float
needle dirty or worn
Loose carburetor jets
Electronic ignition adjustment defective
Idling jet blocked
Adjusting screws on carburetor distorted
Spark plug defective
Ignition system defective
Lack of fuel
Engine takes in bad air
Loose contact or oxidized connector
Too little coolant in cooling system
Radiator fins very dirty
Foam formation in cooling system
Bent radiator hose
Thermostat defective
Defect in radiator fan system
Fuel feed interrupted
Air filter very dirty
Exhaust system leaky, deformed or too
little glass fiber yarn filling in main
silencer.
Valve clearance too little
Electronic ignition adjustment defective
Engine vent hose bent
Engine oil level too high
Engine oil too thin (low viscosity)
Fault in the electrical system
Battery is not charged by generator
Measure
Follow the instructions on starting the
engine. ( P. 20)
x
Recharge the battery.
Check the cause of discharging.
Change the main fuse. (
Check electrical system.
Recharge the battery. Establish the
reason for discharging or have it
checked in a KTM workshop.
Have carburetor checked.
Have carburetor checked.
Have ignition system checked.
Clean carburetor.
Have the carburetor adjusted.
Change spark plug.
Have ignition system checked.
Clean and check the fuel system and
carburetor.
Check rubber sleeves and carburetor
for tightness.
Check electrical system.
Clean socket connector and treat it
with contact spray.
Check the cooling system for leakage.
Check the coolant level. (
Clean radiator fins.
x
Drain the coolant. (
Fill coolant / bleed cooling system.
( P. 69)
Replace the radiator hose.
Have thermostat removed and checked.
Specification
Opening temperature: 70 °C (158 °F)
Have the radiator fan system checked.
Check the tank breather.
Clean fuel tap.
Clean carburetor.
x
Clean the air filter. (
Check exhaust system for damage.
Have valve clearance adjusted.
Have ignition system checked.
Route the vent hose without bends or
replace it if necessary.
Check the engine oil level. (
x
Change the engine oil and oil filter,
clean the oil screens.
Change the fuses of individual power-
consuming components. (
Check electrical system.
Check electrical system.
78
( P. 58)
P. 59)
P. 68)
P. 68)
x
P. 66)
P. 72)
( P. 73)
P. 59)