KTM 505 SX - Engine Stalls or Is Backfiring into the Carburetor.; Engine Overheats.; Engine Has a Lack of Power

TROUBLESHOOTING 163
Faults Possible cause Action
Engine turns but does not start. Operating error – Follow the instructions on starting the engine.
( p. 32)
Vehicle was out of use for a long time
and there is old fuel in the float cham-
ber
–
Drain the carburetor float chamber. x
( p. 146)
Fuel supply interrupted – Check the fuel tank breather.
– Clean the fuel tap.
–
Check/adjust the carburetor components. x
Spark plug oily or wet – Clean and dry spark plug or replace if necessary.
Electrode distance (plug gap) of spark
plug too wide
– Adjust the plug gap.
Guideline
Spark plug electrode gap
0.7 mm (0.028 in)
Fault in ignition system –
Check the ignition system. x
Socket connector of CDI control
device, pulse generator or ignition coil
oxidized
– Clean the plug-in connector and treat it with con-
tact spray.
Water in carburetor or jets blocked –
Check/adjust the carburetor components. x
Idle speed is set too high –
Carburetor - adjust the idle speed. x
( p. 144)
Adjusting screws on carburetor dis-
torted
–
Carburetor - adjust the idle speed. x
( p. 144)
Idling jet blocked –
Check/adjust the carburetor components. x
Loose carburetor jets –
Check/adjust the carburetor components. x