20 TROUBLESHOOTING 95
Faults Possible cause Action
The engine cannot be cranked (elec-
tric starter)
(All XC models)
Operating error – Go through the steps of starting the engine.
( p. 23)
Battery discharged –
Recharge the battery. x ( p. 77)
–
Check the charging voltage. x
–
Check the closed current. x
–
Check the alternator. x
Main fuse is blown – Remove the main fuse.
– Install the main fuse.
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. 23)
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. 85)
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
(125/150 SX)
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
Kill switch cable in wiring harness
frayed, kill switch defective
–
Check the kill switch. x
The connector or ignition coil is loose
or oxidized
– Clean the 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. 84)
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 and air filter box. x
( p. 49)
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. 51)
Fault in ignition system –
Check the ignition system. x
Diaphragm or reed valve housing
damaged
– Check the diaphragm and reed valve housing.
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