Troubleshooting - KTM 50 SX 2010 Repair Manual

TROUBLESHOOTING

Faults
Engine turns but does not start
Engine has no idle
Engine does not speed up
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
Engine flooded
Spark plug oily or wet
Electrode distance (plug gap) of spark
plug too wide
Fault in ignition system
Short circuit cable in cable harness
frayed, kill switch defective
Socket 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
Action
–
Go through the steps of starting the engine.
( p. 7)
–
Empty the carburetor float chamber.
–
Check the fuel tank breather.
–
Clean the fuel tap.
(50 SX Mini)
–
Check/set the carburetor components.
( p. 99)
(50 SX)
–
Check/set the carburetor components.
( p. 98)
–
Clean and dry the spark plug, or change it if
necessary.
–
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. (
–
Check the kill switch. (
–
Clean the socket connector and treat it with
contact spray.
(50 SX Mini)
–
Check/set the carburetor components.
( p. 99)
(50 SX)
–
Check/set the carburetor components.
( p. 98)
(50 SX Mini)
–
Check/set the carburetor components.
( p. 99)
(50 SX)
–
Check/set the carburetor components.
( p. 98)
(50 SX Mini)
–
Carburetor - adjust the idle speed.
( p. 108)
(50 SX)
–
Carburetor - adjust the idle speed.
( p. 107)
–
Change spark plug.
–
Check the ignition coil. (
–
Check the spark plug connector. (
(50 SX Mini)
–
Check/set the carburetor components.
( p. 99)
(50 SX)
–
Check/set the carburetor components.
( p. 98)
(50 SX Mini)
–
Check/set the carburetor components.
( p. 99)
(50 SX)
–
Check/set the carburetor components.
( p. 98)
121
p. 119)
p. 120)
p. 119)
p. 119)