20 TROUBLESHOOTING 110
Faults Possible cause Action
The engine cannot be cranked (elec-
tric starter)
(TX 300)
Operating error – Carry out the start procedure. ( p. 26)
Battery discharged – Recharge the battery. ( p. 87)
– Check the charging voltage.
– Check the closed current.
– Check the alternator.
Main fuse blown – Change the main fuse. ( p. 88)
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. 26)
Motorcycle was out of use for a long
time and there is old fuel in the float
chamber
– Empty the carburetor float chamber.
( p. 100)
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
(TC 125)
Spark plug electrode gap
0.60 mm (0.0236 in)
(TC 250)
Spark plug electrode gap
0.60 mm (0.0236 in)
(TX 300)
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. 99)
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. 57)
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. 59)
Fault in ignition system – Check the ignition system.
Diaphragm or reed valve housing
damaged
– Check the diaphragm and reed valve housing.
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