20 TROUBLESHOOTING
124
Faults Possible cause Action
Engine turns but does not start Operating error – Carry out the start procedure.
( p. 21)
Motorcycle was out of use for a
long time and there is old fuel
in the float chamber
– Empty the carburetor float chamber.
Fuel supply interrupted – Check the fuel tank breather.
– Clean the fuel tap.
(50 SX, FACTORY EDITION)
– Check/set the carburetor compo-
nents.
(50 SX MINI)
– Check/set the carburetor compo-
nents.
Spark plug sooty or wet – Clean and dry the spark plug and spark
plug connector, or change if necessary.
Plug gap of spark plug too wide – Adjust plug gap.
Guideline
Spark plug electrode gap
0.60 mm (0.0236 in)
Fault in ignition system – Check the ignition system.
Short-circuit cable in wiring
harness frayed, stop button
faulty
– Check the stop button.
The connector or ignition coil is
loose or oxidized
– Clean the plug-in connection and treat
it with contact spray.
Water in carburetor or jets
blocked
(50 SX, FACTORY EDITION)
– Check/set the carburetor compo-
nents.
(50 SX MINI)
– Check/set the carburetor compo-
nents.
Engine has no idle speed Idling jet blocked
(50 SX, FACTORY EDITION)
– Check/set the carburetor compo-
nents.
(50 SX MINI)
– Check/set the carburetor compo-
nents.
Adjusting screws on the carbu-
retor are in turned to the wrong
position
(50 SX, FACTORY EDITION)
– Carburetor – adjust the idle
speed. ( p. 101)
(50 SX MINI)
– Carburetor – adjust the idle
speed. ( p. 102)
Spark plug defective – Change spark plug.
Ignition system defective – Check the ignition coil.
– Check the spark plug connector.
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