KTM 250 SX-F User Manual

20 TROUBLESHOOTING
124
Faults Possible cause Action
The engine does not turn when
the electric starter button is
pressed
Operating error – Carry out the start procedure.
( p. 28)
Battery discharged – Recharge the battery. ( p. 101)
– Check the charging voltage.
– Check the open-circuit current.
– Check the stator winding of the alter-
nator.
Main fuse blown – Change the main fuse. ( p. 102)
Faulty starter relay – Check the starter relay.
Faulty starter motor – Check the starter motor.
Engine turns but does not start The plug-in connection of the
fuel line is not connected
– Connect the plug-in connection of the
fuel line.
Fuel screen in the fuel hose
connection is clogged
– Change the fuel screen. ( p. 114)
Idle speed is not set correctly – Adjust the idle speed. ( p. 111)
Spark plug oily or wet – Clean and dry the spark plug, or
change it if necessary.
Electrode distance (plug gap)
of spark plug too wide
– Adjust the plug gap.
Guideline
Spark plug electrode gap
0.8 mm (0.031 in)
Short circuit cable in wiring
harness frayed, kill switch
defective
– Check the wiring harness. (visual
check)
– Check the electrical system.
Defect in fuel injection system – Read out the fault memory using the
KTM diagnostics tool.
Engine does not speed up Defect in fuel injection system – Read out the fault memory using the
KTM diagnostics tool.
Engine has too little power Air filter is very dirty – Clean the air filter and air filter box.
( p. 66)
Fuel filter is very dirty – Change the fuel filter.
Defect in fuel injection system – Read out the fault memory using the
KTM diagnostics tool.
Exhaust system leaky,
deformed or too little glass
fiber yarn filling in main
silencer
– Check exhaust system for damage.
– Change the glass fiber yarn filling of
the main silencer. ( p. 68)
Valve clearance too little – Adjust the valve clearance.
Engine dies during the trip Lack of fuel – Refuel. ( p. 33)
Engine overheats Too little coolant in cooling sys-
tem
– Check the cooling system for leakage.
– Check the coolant level. ( p. 105)
Too little air stream – Switch off the engine when standing.
Radiator fins very dirty – Clean the radiator fins.
Foam formation in cooling sys-
tem
– Drain the coolant. ( p. 105)
– Refill the coolant. ( p. 106)
Bent radiator hose – Change the radiator hose.

KTM 250 SX-F Specifications

General

Brand	KTM
Model	250 SX-F
Category	Motorcycle
Language	English