Troubleshooting - KTM 525 XC ATV 2008 Owner's Manual

TROUBLESHOOTING

Faults
Engine turns but does not start.
Possible cause
Operating error
Vehicle was out of use for a long time and
there is old fuel in the float chamber
Fuel feed interrupted
Engine flooded
Spark plug oily or wet
Electrode distance (plug gap) of spark
plug too wide
Spark plug connector or spark plug defec-
tive
Socket connector of CDI control device,
pulse generator or ignition coil oxidized
Water in carburetor or jets blocked
Idle speed is set too high
Emergency OFF switch with rip cord
faulty
Throttle lever activated
Switch for throttle lever faulty
Throttle valve sensor TPS incorrectly set
or faulty
Measure
Follow the instructions on starting the
engine. ( P. 20)
Empty the carburetor float chamber.
( P. 72)
Check the tank breather.
Clean fuel tap.
Clean carburetor.
Clean and dry spark plug or replace if
necessary.
Clean and dry spark plug or replace if
necessary.
Adjust plug gap.
Specification
Spark plug electrode gap
0.6 mm (0.024 in)
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.
Clean socket connector and treat it
with contact spray.
Clean carburetor.
Carburetor - adjust the idle speed.
( P. 71)
Check wiring harness. (visual check)
Check electrical system.
Do not activate the throttle lever.
See instructions on starting.
Check wiring harness. (visual check)
Check electrical system.
Have the throttle valve sensor TPS
checked or adjusted.
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