19 Troubleshooting - KTM 65 SX 2023 Owner's Manual

19 TROUBLESHOOTING

Faults
Engine turns but does not start
Engine has no idle speed
Engine does not speed up
Engine has too little power
100
Possible cause
Operating error
Motorcycle was out of use for a
long time and there is old fuel
in the float chamber
Fuel supply interrupted
Spark plug sooty or wet
Plug gap of spark plug too wide
Fault in ignition system
Short-circuit cable in wiring
harness frayed, stop button
faulty
The connector or ignition coil is
loose or oxidized
Water in carburetor or jets
blocked
Idling jet blocked
Adjusting screws on carburetor
distorted
Spark plug defective
Ignition system defective
Carburetor running over
because float needle dirty or
worn
Loose carburetor jets
Fault in ignition system
Fuel supply interrupted
Air filter very dirty
Exhaust system leaky,
deformed or too little glass
fiber yarn filling in main
silencer
Fault in ignition system
Action
–
Carry out the start procedure.
( p. 21)
–
Empty the carburetor float chamber.
( p. 91)
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/set the carburetor
components.
–
Clean and dry the spark plug and spark
plug connector, or change if necessary.
–
Adjust plug gap.
Guideline
Spark plug electrode gap
0.60 mm (0.0236 in)
–
Check the ignition system.
–
Adjust the ignition.
–
Check the stop button.
–
Clean the plug-in connection and treat
it with contact spray.
–
Check/set the carburetor
components.
–
Check/set the carburetor
components.
– Carburetor – adjust the idle speed.
( p. 90)
–
Change 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.
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/set the carburetor
components.
–
Clean the air filter and air filter box.
( p. 50)
–
Check exhaust system for damage.
–
Change the glass fiber yarn filling of
the main silencer. (
–
Check the ignition system.
–
Adjust the ignition.
p. 52)