Troubleshooting - KTM 85 SX 19 Owner's Manual

19

TROUBLESHOOTING

Faults
Engine turns but does not start
Engine has no idle
Engine does not speed up
Engine has too little power
Engine stalls or is popping into the
carburetor
Engine overheats
Possible cause
Operating error
Motorcycle was out of use for a long
time and there is old fuel in the float
chamber
Fuel feed interrupted
Spark plug oily or wet
Electrode distance (plug gap) of spark
plug too wide
Fault in ignition system
Short circuit cable in wiring harness
frayed, kill switch defective
The connector or ignition coil is loose
or oxidized
Water in carburetor or jets blocked
Idling jet blocked
Adjusting screws on carburetor dis-
torted
Spark plug defective
Ignition system defective
Carburetor running over because float
needle dirty or worn
Loose carburetor jets
Fault in ignition system
Fuel feed interrupted
Air filter is very dirty
Exhaust system leaky, deformed or
too little glass fiber yarn filling in
main silencer
Fault in ignition system
Membrane or reed valve housing is
damaged
Lack of fuel
Engine takes in bad air
The connector or ignition coil is loose
or oxidized
Too little coolant in cooling system
Too little air stream
Radiator fins very dirty
Action
–
Carry out the start procedure. (
–
Empty the carburetor float chamber.
( p. 70)
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/set the carburetor components.
–
Clean and dry the spark plug, or change it if
necessary.
–
Adjust the plug gap.
Guideline
Spark plug electrode gap
0.60 mm (0.0236 in)
–
Check the ignition system.
–
Adjust the ignition.
x
–
Check the kill switch.
x
–
Clean the connector and treat it with contact
spray.
–
Check/set the carburetor components.
–
Check/set the carburetor components.
–
Carburetor - adjust the idle speed.
( p. 69)
–
Change the spark plug.
–
Check the ignition coil.
–
Check the spark plug connector.
–
Check/set the carburetor components.
–
Check/set the carburetor components.
–
Check the ignition system.
–
Adjust the ignition.
x
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/set the carburetor components.
–
Clean the air filter and air filter box.
( p. 42)
–
Check exhaust system for damage.
–
Change the glass fiber yarn filling of the main
silencer. ( p. 43)
x
–
Check the ignition system.
–
Adjust the ignition.
x
–
Check the membrane and reed valve housing.
–
Turn tap handle on the fuel tap to the ON
1
position. (Figure L00035-10
–
Refuel. ( p. 23)
–
Check intake flange and carburetor for tight-
ness.
–
Clean the connector and treat it with contact
spray.
–
Check the cooling system for leaks.
–
Check the coolant level. (
–
Switch off the engine when standing.
–
Clean the radiator fins.
77
p. 20)
x
x
x
x
x
x
x
x
p. 12)
p. 65)