KTM 400/620 LCA - Troubleshooting

8.0 TROUBLE SHOOTING
If you let the specified maintenance work on your motorcycle be carried oui
Should an error occur nevertheless, we advise you to use the trouble sho
error.
We would like to point out that many operations cannot be performed by oneself. In case of uncertainty, please
contact a KTM-dealer.
disturbances can hardly be expected.
ng chart in order to find the cause of
TROUBLE
Engine will not start
CAUSE
Operating error
REMEDY
Switch on (gnition. Put short circuit switch into RUN-
position at gas handle, open up fuel cock, tank fuel,
do not use choke i.e. the warmstart device. Pay atten-
tion to starting off information (see driving instruc-
tions).
Fuel supply interrupted
Close fuel cock, loosen fuel hose at carburettor, lead
into a basin and open fuel cock,
— if fuel leaks out, clean carburettor
if no fuel leaks out, check tank ventilation, ie.
clean fuel cock
Flooded engine See driving instructions
Sooty or wet spark plug Clean or replace spark plug
Electrode gap too large Adjust spark plug elektrode gap to 0,6 mm
Spark plug connector or spark
plug fauity
Dismount spark plug, connect ignition cable, hold to
ground (blank place on engine) and actuate kickstar-
ter, 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
Ifa spark now occurs, replace spark plug cap
- If no spark is produced, control ignition system
If connector oxidates from ge-
nerator to ignition coil
Remove fuel tank, clean connector and treat with
contact spray
Short circuit cable scored in
wiring harness, ignition lock,
short circuit switch or short
circuit button faulty
Remove fuel tank, draw off blue/biack cable from
orange cable of ignition coil and check spark.
= If a spark is produced, seek fault in short circuit
current
Water in short circuit switch | Remove 2-pole connector located underneath the he
adlight mask, treat short circuit switch with contact
Spray
86
TROUBLE
Engine will not start
CAUSE
Water in carburettor or jets
blocked
Carburettor does not fit in
properly at intake flange
REMEDY
Dismount and clean carburettor
Check if carburettor is fitted in correctly
Engine will not idle
Idling jet blocked
Adjusting screws on carburet-
tor uncorrect adjusted
Ignition system faul
Dismount carburettor and clean jets
Adjust carburettor
Have ignition system checked
Engine does not rev high
Carburettor fuel level too high
because float needle valve is
dirty or worn out
Loose carburettor jets
Electronical ignition timing
faulty
Dismount carburettor and check if worn out
Tighten jets
Have ignition system checked
Engine will not reach
full power
Fuel supply partically interrup-
ted or carburettor dirty
fioat is not tight, or no axial
play
Air filter very dirty
Exhaust leaking or blocked
Valve gap to small
Loss of compression because
decompressor has no play
Electronical ignition timing
faulty
Clean and check fuel system as well as carburettor
replace or abrade the float
Clean or replace air filter
Check if exhaust is damaged, replace glas fibre yam
in exhaust silencer
Adjust valve gap
Check setting of the decompression cable
Have ignition system checked
Engine stops or splutters
in carburettor
Insuffient fuel
Engine takes air out of control
Clean and check fuel system and carburettor
Check intake flange and carburettor if firmly setted