TROUBLESHOOTING 72
9TROUBLESHOOTING
Faults Possible cause Measure
Battery discharged Battery is not charged by generator – Check electrical system.
Engine turns but does not start. Operating error – Carry out work steps for the start proce-
dure. ( P. 23)
Motorcycle was out of use for a long time
and there is old fuel in the float chamber
– Drain the fuel from the carburetor into
a suitable container.
Fuel feed interrupted – Check the tank breathers.
– Check the fuel filter.
– Have the fuel screen of the tanks
checked.
– Clean fuel tap.
– Clean carburetor.
– Have the fuel pump checked.
Engine flooded – Clean and dry the spark plug or replace
it.
Spark plug oily or wet – Clean and dry the spark plug or replace
it.
Electrode distance (plug gap) of spark
plug too wide
– Adjust plug gap.
Specification
spark plug electrode gap
0.9 mm (0.04 in)
Spark plug connector or spark plug defec-
tive
Warning
Risk of injury The ignition sys-
tem is under high voltage.
– Do not touch parts of the
ignition system. Have work
on the ignition system car-
ried out in an authorized
KTM workshop.
– Remove spark plug, connect ignition
cable, hold spark plug to ground (bare
metal area on engine), and try to start
the engine.
Specification
You should see a strong spark on the
spark plug.
– If there is no spark, change the spark
plug.
– If there is still no spark, remove the
spark plug cap from the ignition cable,
hold it at the specified distance from
the ground contact, and try to start the
engine.
Specification
5 mm (0.2 in)
– If you now have a spark, replace the
spark plug connector.
– If there is no spark, have the ignition
system checked.
Short-circuit cable in wiring harness
chafed, short-circuit button defective
– Check wiring harness. (visual check)
– Check electrical system.
Socket connector of CDI control device,
pulse generator or ignition coil oxidized.
– Clean socket connector and treat it
with contact spray.
Water in carburetor or jets blocked – Clean carburetor.
The engine cannot be cranked (electric
starter).
Operating error – Carry out work steps for the start proce-
dure. ( P. 23)
Battery discharged – Recharge the battery. ( P. 61)
– Check the cause of discharging.
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