TROUBLESHOOTING
91
Faults
Possible cause
Action
The engine cannot be cranked (elec-
tric starter)
(250 EXC AUS/XC
‑
W/XC,
all 300 models)
Operating error
–
Go through the steps of starting the engine.
(
p. 31)
Battery discharged
–
Recharge the battery.
x
(
p. 72)
–
Check the charging voltage.
x
–
Check the closed current.
x
–
Check the alternator.
x
Fuse blown
–
Remove the fuse. (
p. 73)
–
Replace the fuse. (
p. 73)
Starter relay faulty
–
Check the starter relay.
x
Starter motor faulty
–
Check the starter motor.
x
Engine turns but does not start
Operating error
–
Go through the steps of starting the engine.
(
p. 31)
Motorcycle was out of use for a long
time and there is old fuel in the float
chamber
–
Empty the carburetor float chamber.
x
(
p. 87)
Fuel feed interrupted
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/set the carburetor components.
Spark plug oily or wet
–
Clean and dry the spark plug, or change it if
necessary.
Electrode distance (plug gap) of spark
plug too wide
–
Adjust the plug gap.
Guideline
(All 125/150/200 models)
Spark plug electrode gap
0.60 mm (0.0236 in)
(All 250/300 models)
Spark plug electrode gap
0.60 mm (0.0236 in)
Fault in ignition system
–
Check the ignition system.
x
Short circuit cable in wiring harness
frayed, short circuit button defective
–
Check the short circuit button.
x
Socket connector or ignition coil is
loose or oxidized
–
Clean the plug-in connector and treat it with
contact spray.
Water in carburetor or jets blocked
–
Check/set the carburetor components.
Engine has no idle
Idling jet blocked
–
Check/set the carburetor components.
Adjusting screws on carburetor dis-
torted
–
Carburetor - adjust the idle speed.
x
(
p. 86)
Spark plug defective
–
Change the spark plug.
Ignition system defective
–
Check the ignition coil.
x
–
Check the spark plug connector.
x
Engine does not speed up
Carburetor running over because float
needle dirty or worn
–
Check/set the carburetor components.
Loose carburetor jets
–
Check/set the carburetor components.
Fault in ignition system
–
Check the ignition system.
x
Engine has too little power
Fuel feed interrupted
–
Check the fuel tank breather.
–
Clean the fuel tap.
–
Check/set the carburetor components.
Air filter very dirty
–
Clean the air filter.
x
(
p. 82)
Exhaust system leaky, deformed or
too little glass fiber yarn filling in
main silencer
–
Check exhaust system for damage.
–
Change the glass fiber yarn filling of the main
silencer.
x
(
p. 81)
Fault in ignition system
–
Check the ignition system.
x
Diaphragm or reed valve housing
damaged
–
Check the diaphragm and reed valve housing.
Summary of Contents for 125 SX 2010
Page 2: ...OWNERSMANUAL2010 250 SX 250 300 XC XC W EXC EXC SixDays ...
Page 3: ...OWNER S MANUAL 2010 125 SX 150 SX 250 SX Art no 3211480en ...
Page 91: ...TECHNICAL DATA SHOCK ABSORBER 89 Shock absorber oil p 95 SAE 2 5 ...
Page 93: ...91 ...
Page 222: ...119 ...
Page 223: ...WIRING DIAGRAM 120 ...
Page 226: ...WIRING DIAGRAM 123 ...
Page 304: ...1 2 3 4 7 12 Art No 3 206 088 E Repair manual KTM 250 300 ...
Page 306: ...bl bk 6 7 8 9 7 14 Art No 3 206 088 E Repair manual KTM 250 300 ...
Page 308: ...1 2 3 4 5 7 16 Art No 3 206 088 E Repair manual KTM 250 300 ...
Page 393: ...11 15 PERIODIC MAINTENANCE SCHEDULE 2010 250 SX ...
Page 394: ...11 16 Repair manual KTM 250 300 Art No 3 206 088 E ...
Page 396: ...11 18 Repair manual KTM 250 300 Art No 3 206 088 E ...
Page 397: ...11 19 ...
Page 409: ...EXC 250 300 2005 EXC SIX DAYS 250 300 05 06 12 11 ...
Page 413: ...EXC 250 300 2005 EXC SIX DAYS 250 300 05 06 12 15 ...
Page 414: ...EXC USA 250 2005 12 16 Art No 3 206 088 E Repair manual KTM 250 300 ...
Page 416: ...12 18 Repair manual KTM 250 300 Art No 3 206 088 E ...
Page 430: ...Repair manual KTM 250 300 Art No 3 206 088 E 12 32 250 EXC EXC Six Days EU AUS 2008 2009 ...
Page 431: ...12 33 250 300 XC USA 2008 250 CX W ZA 2008 2009 ...
Page 433: ...12 35 300 EXC E EXC E SixDays EU AUS 2008 2009 ...
Page 437: ...12 39 250 SX 2010 ...
Page 438: ...12 40 Repair manual KTM 250 300 Art No 3 206 088 E ...
Page 439: ...12 41 250 EXC EU 2010 ...
Page 440: ...12 42 Repair manual KTM 250 300 Art No 3 206 088 E ...
Page 441: ...12 43 250 300 EXC 2010 ...
Page 442: ...12 44 Repair manual KTM 250 300 Art No 3 206 088 E ...
Page 443: ...12 45 250 300 XC XC W 2010 ...
Page 444: ...12 46 Repair manual KTM 250 300 Art No 3 206 088 E ...
Page 445: ...REPAIRMANUAL2004 2010 2004 2005 DCC ...
Page 553: ...1 7 T 14031 Dismounting mounting tool ...
Page 559: ...2 6 Exploded view PDS 5018 SXS SMR 2005 2006 ...
Page 561: ...2 8 Exploded view PDS 5018 SXS 2007 ...
Page 739: ...1 7 T 14 030 Adaptor T 14 033 Assembling tool ...
Page 741: ...2 2 Repair manual WP Fork Closed Cartridge Art No 3 211 199 E Exploded view SXS 2005 ...
Page 746: ...2 7 Exploded view SXS 2006 ...
Page 751: ...2 12 Repair manual WP Fork Closed Cartridge Art No 3 211 199 E Exploded view SX 2007 ...
Page 756: ...2 17 Exploded view Fork SXS 2007 ...