Operation Manual

21 TROUBLESHOOTING 119
Faults Possible cause Action
The engine cannot be cranked (elec-
tric starter)
(All 250/300 models, XC‑W US,
XC‑W Six Days US)
Operating error – Carry out the start procedure. ( p. 35)
Battery discharged – Recharge the battery. ( p. 91)
– Check the charging voltage.
– Check the closed current.
– Check the alternator.
Main fuse is blown – Change the main fuse. ( p. 93)
Starter relay faulty – Check the starter relay.
Starter motor faulty – Check the starter motor.
Engine turns but does not start Operating error – Carry out the start procedure. ( p. 35)
Motorcycle was out of use for a long
time and there is old fuel in the float
chamber
– Empty the carburetor float chamber.
( p. 111)
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 models)
Spark plug electrode gap (125 XC‑W EU)
0.60 mm (0.0236 in)
Spark plug electrode gap (150 XC‑W US)
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.
Kill switch cable in wiring harness
frayed, kill switch defective
– Check the kill switch.
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.
( p. 106)
Spark plug defective – Change the spark plug.
Ignition system defective – Check the ignition coil.
– Check the spark plug connector.
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.
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.
( p. 63)
Exhaust system leaky, deformed or
too little glass fiber yarn filling in
main silencer
– Check exhaust system for damage.
– Change glass fiber yarn filling in the main
silencer. ( p. 65)
Fault in ignition system – Check the ignition system.
Diaphragm or reed valve housing
damaged
– Check the diaphragm and reed valve housing.