Trouble Shooting; Troubleshooting - KTM 85 SX 2003 Owner's 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 fails to start
30
Engine without idle run-
ning
Engine has not enough
power

TROUBLE SHOOTING

CAUSE
Operating error
Fuel supply interrupted
Electrode distance too great
Plug fouled by oil, wet or bridged
Ignition wire or spark plug connec-
tor damaged
Kill button wire or
short-circuit switch faulty
Loose ignition cable connectors
Spark too weak
Water in the carburetor and jets
blocked
Idle adjusting screw out of adjust-
ment
Ignition system damaged
Wear
Charred glass fiber yarn in silencer
Air filter obstructed
Fuel supply partly interrupted or
blocked
Loss of compression through loose
spark plug
Exhaust system damaged
Engine has not enough preignition
REMEDY
Open fuel tap, replenish fuel, do not use choke
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
Reduce electrode distance (0.60 mm)
Clean spark plug or renew
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
Disconnect black coloured cable from short circuit button at
ignition coil and check ignition spark. If the spark is O.K.
repair defective part of cable or ignition switch
Inspect cable connectors
Examine ignition system
Dismantle and clean carburetor
Readjust idle running or replace idle adjusting screw
Examine ignition system
Overhaul engine
Renew filling
Clean or renew airfilter
Blow through fuel pipe and clean carburetor
Tighten spark plug
Check exhaust system for damage
Check and adjust ignition