KTM 450 SX ATV User Manual

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TROUBLESHOOTING 154

Faults Possible cause Action

Engine has no idle. Ignition system defective –

Check the spark plug connector. x

–

Check the ignition coil. x

–

Check the ignition pulse generator. x

–

Check the alternator. x

–

Check the CDI controller. x

Engine stalls or is backfiring into the

carburetor.

Lack of fuel – Turn the handle  of the fuel tap to ON.

– Fill up with fuel. ( p. 43)

Intake system air leak – Check rubber sleeves and carburetor for tight-

ness.

Loose contact or oxidized connector – Check the electrical system.

– Clean the plug-in connector and treat it with con-

tact spray.

Engine overheats. Coolant level low – Check the cooling system for leakage.

– Check the coolant level. ( p. 136)

Radiator fins excessively dirty – Clean radiator fins.

Foam formation in cooling system –

Drain the coolant. x ( p. 137)

–

Fill coolant/bleed the cooling system. x

( p. 138)

Bent radiator hose –

Change the radiator hose. x

Thermostat defective –

Check the thermostat. x

Radiator fan system faulty –

Check the radiator fan system. x

Engine has a lack of power Fuel supply interrupted – Check the fuel tank breather.

– Clean the fuel tap.

–

Check/adjust the carburetor components. x

Questions and Answers: