KTM 125 LC2 1998 Owner's Handbook Manual page 27

TROUBLE
Engine fails to rev high
Engine has too little power
Engine misfires or backfires
into carburetor
Engine overheats
All activated lamps are
blown out
Battery is discharged
CAUSE
fuel level in carburetor is too high
– leaking float needle valve
– float is not tight
– float has no axial play
loose carburetor jets
electronic ignition timing is faulty
fuel supply partially interrupted or
dirty carburetor
control roller fails to move
incorrect adjustment of control rol-
ler cables
fuel level in carburetor is too high
air filters are extremely dirty
leaking or deformed exhaust system
electronic ignition timing is faulty
fuel shortage
engine takes in unmetered air
not enough cooling liquid in coo-
ling system
radiator fins are extremely dirty
foam forms in cooling system
bent radiator hose
defective thermostat
defective voltage regulator
ignition (power consumer) not tur-
ned OFF
discharge due to residual current
no charge
REMEDY
disassemble and clean carburetor, and check it for wear
replace float needle valve
replace float
resurface float
tighten jets
have ignition system checked
clean and check fuel system and carburetor
turn on ignition and check whether the cleaning cycle of the
control roller is executed. If not, check control roller for
smooth running or check servomotor
adjust cables
disassemble and clean carburetor, and check it for wear
clean or replace air filter
check exhaust system for damage
have ignition system checked
check and clean fuel system and carburetor
check intake flange and carburetor for tight fit
replenish cooling liquid (see maintenance work), check coo-
ling system for leaks
clean radiator fins with water jet
replace cooling liquid, use branded antifreeze agent
shorten or replace radiator hose
dismantle thermostat and have it checked (opening tempera-
ture: 65° C) or replace it
remove seat and fuel tank, and check connections, check vol-
tage regulator
charge battery according to instructions
perform electric loss test
check connections and components of the charging system
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