KTM 450 XC, Owner'S Manual

Page: 177 / 208

TROUBLESHOOTING
175
Faults Possible cause Action
Engine does not speed up. Electronic ignition adjustment defective
–
Have ignition system checked.
Engine has no idle. Idling jet blocked
–
Clean carburetor.
Adjusting screws on carburetor distorted
–
Have the carburetor adjusted.
Spark plug defective
–
Change spark plug.
Ignition system defective
–
Have ignition system checked.
Engine stalls or is popping into the carbu-
retor. Lack of fuel
–
Clean and check the fuel system and
carburetor.
Engine takes in bad air
–
Check rubber sleeves and carburetor for
tightness.
Loose contact or oxidized connector
–
Check electrical system.
–
Clean socket connector and treat it with
contact spray.
Engine overheats. Too little coolant in cooling system
–
Check the cooling system for leakage.
–
Check the coolant level. ( p. 152)
Radiator fins very dirty
–
Clean radiator fins.
Foam formation in cooling system
–
Drain the coolant. x ( p. 153)
–
Fill coolant/bleed cooling system. x
( p. 156)
Bent radiator hose
–
Replace the radiator hose.
Thermostat defective
–
Have thermostat removed and checked.
Guideline
Opening temperature: 70 °C (158 °F)
Defect in radiator fan system
–
Have the radiator fan system checked.