Troubleshooting - KTM 400 EXC EU Owner's Manual

TROUBLESHOOTING

TROUBLESHOOTING 10
Faults
The engine cannot be cranked (electric
starter).
Engine turns but does not start.
Engine has no idle.
Engine does not speed up.
Possible cause
Operating error
Battery discharged
Fuse blown
Starter relay defective
Starter motor defective
Operating error
Motorcycle 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
Defect in ignition system
Short-circuit cable in cable harness
frayed, short-circuit button or emergency
OFF switch defective
Plug connector of CDI control device,
pulse generator or ignition coil oxidized.
Water in carburetor or jets blocked
Idling jet blocked
Adjusting screws on carburetor distorted
Spark plug defective
Ignition system defective
Carburetor running over because float
needle dirty or worn.
Loose carburetor jets
Ignition system defective
Action
–
Go through the steps of starting the
engine. ( p. 26)
–
Recharge the battery.
x
–
Check the charging voltage.
–
Check the closed current.
–
Check the generator. x
–
Remove the fuse. ( p. 69)
–
Install the fuse. ( p. 69)
–
Check the starter relay.
x
–
Check the starter motor.
x
–
Go through the steps of starting the
engine. ( p. 26)
–
Empty the carburetor float
chamber. ( p. 79)
x
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/adjust the carburetor compo-
nents.
x
–
Clean and dry the spark plug or replace
if necessary.
–
Clean and dry the spark plug or replace
if necessary.
–
Adjust plug gap.
Guideline
Spark plug electrode gap
0.9 mm (0.035 in)
–
Check the ignition system.
–
Check the wiring harness (visual
check).
–
Check the electrical system.
–
Clean the plug connector and treat it
with contact spray.
–
Check/adjust the carburetor compo-
nents.
x
–
Check/adjust the carburetor compo-
nents.
x
–
Carburetor - adjust the idle speed.
( p. 78)
–
Change spark plug.
–
Check the ignition coil.
x
–
Check the CDI unit.
x
–
Check the spark plug connector.
–
Check the ignition pulse generator.
–
Check the generator.
x
–
Check/adjust the carburetor compo-
nents.
x
–
Check/adjust the carburetor compo-
nents.
x
–
Check the ignition coil. x
–
Check the CDI unit.
x
–
Check the spark plug connector.
–
Check the ignition pulse generator.
–
Check the generator.
x
85
( p. 68)
x
x
x
x
x
x
x
x