KTM 85SX - Manual (Page 32)

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TROUBLE SHOOTING
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TROUBLE CAUSE REMEDY
Engine fails to start Operating error
The motorcycle was not driven
for a longer period of time,
leaving old fuel in the float
chamber
Fuel supply interrupted
Electrode distance too great
Plug fouled by oil, wet or bridged
Ignition wire or spark plug con-
nector damaged
Kill button wire or short-circuit
switch faulty
Loose ignition cable connectors
Spark too weak
Water in the carburetor and jets
blocked
Open fuel tap, replenish fuel, do not use choke
The highly inflammable components in modern fuels volatilize if left
standing for longer periods of time. If the motorcycle has not been
used for over 1 week, the fuel should be drained from the float cham-
ber. The engine will start up immediately if the float chamber is
filled with fresh, ignitable fuel
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
Engine without idle running Idle adjusting screw out of
adjustment
Ignition system damaged
Wear
Readjust idle running or replace idle adjusting screw
Examine ignition system
Overhaul engine
Engine has not enough power 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
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
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.