Trouble Shooting - KTM 125 EXE 2001 Owner's Handbook Manual

If you let the specified maintenance work on your motorcycle be carried out, disturbances can hardly be expected. Should an error
occur nevertheless, we advise you to use the trouble shooting chart in order to find the cause of error.
We would like to point out that many operations cannot be performed by oneself. In case of uncertainty, please contact a KTM-dealer.
TROUBLE
Engine will not start
28
Engine will not idle
Engine does not rev high

TROUBLE SHOOTING

CAUSE
Operating error
Fuel supply interrupted
The motorcycle has been out of
operation for a longer period of
time. Therefore old fuel has accu-
mulated in the float chamber
Flooded engine
Sooty or wet spark plug
Electrode gap too large
Spark plug connector or spark plug
faulty
If connector oxidates from genera-
tor to ignition coil
Water in carburettor or jets blocked
Carburettor does not fit in properly
at intake flange
Idling jet blocked
Adjusting screws on carburettor
uncorrect adjusted
Ignition system faulty
Carburettor fuel level too high
because float needle valve is dirty
or worn out
Loose carburettor jets
Electronical ignition timing faulty
REMEDY
Switch on ignition, switch on emergency OFF switch, open fuel
tap, tank fuel, do not use choke i.e. the hotstart device. Pay
attention to starting off information (see driving instructions).
Close fuel tap, loosen fuel hose at carburettor, lead into a
basin and open fuel tap,
– if fuel leaks out, clean carburettor
– if no fuel leaks out, check tank ventilation, i.e. clean fuel tap
The easily inflammable components of the new fuels evapo-
rate during longer periods of standstill.
When the motorcycle has been out of operation for more than
a week, it is therefore recommended to drain the old fuel from
the float chamber. The engine will immediately start off when
the float chamber is filled with new fuel.
Close the fuel tap and start the engine with full throttle.
If the engine does not start, the spark plug needs cleaned.
If the engine runs, the fuel tap is open too wide.
Clean or replace spark plug
Adjust spark plug elektrode gap to 0,6 mm
Dismount spark plug, connect ignition cable, hold to ground
(blank place on engine) and actuate kickstarter, a strong spark
must be produced at the spark plug
– If no spark is produced, loosen spark plug cap from ignition
cable, hold about 5 mm from ground and actuate kickstarter
– If a spark now occurs, replace spark plug cap
– If no spark is produced, control ignition system
Remove fuel tank, clean connector and treat with contact
spray
Dismount and clean carburettor
Check if carburettor is fitted in correctly
Dismount carburettor and clean jets
Adjust carburettor
Have ignition system checked
Dismount carburettor and check if worn out
Tighten jets
Have ignition system checked