TROUBLESHOOTING 121
Faults Possible cause Action
Engine turns but does not start Operating error – Go through the steps of starting the engine.
( p. 7)
Motorcycle was out of use for a long
time and there is old fuel in the float
chamber
– Empty the carburetor float chamber.
Fuel feed interrupted – Check the fuel tank breather.
– Clean the fuel tap.
(50 SX Mini)
– Check/set the carburetor components.
( p. 99)
(50 SX)
– Check/set the carburetor components.
( p. 98)
Engine flooded – Clean and dry the spark plug, or change it if
necessary.
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
Spark plug electrode gap
0.60 mm (0.0236 in)
Fault in ignition system – Check the ignition system. ( p. 119)
Short circuit cable in cable harness
frayed, kill switch defective
– Check the kill switch. ( p. 120)
Socket connector or ignition coil is
loose or oxidized
– Clean the socket connector and treat it with
contact spray.
Water in carburetor or jets blocked
(50 SX Mini)
– Check/set the carburetor components.
( p. 99)
(50 SX)
– Check/set the carburetor components.
( p. 98)
Engine has no idle Idling jet blocked
(50 SX Mini)
– Check/set the carburetor components.
( p. 99)
(50 SX)
– Check/set the carburetor components.
( p. 98)
Adjusting screws on carburetor dis-
torted
(50 SX Mini)
– Carburetor - adjust the idle speed.
( p. 108)
(50 SX)
– Carburetor - adjust the idle speed.
( p. 107)
Spark plug defective – Change spark plug.
Ignition system defective – Check the ignition coil. ( p. 119)
– Check the spark plug connector. ( p. 119)
Engine does not speed up Carburetor running over because float
needle dirty or worn
(50 SX Mini)
– Check/set the carburetor components.
( p. 99)
(50 SX)
– Check/set the carburetor components.
( p. 98)
Loose carburetor jets
(50 SX Mini)
– Check/set the carburetor components.
( p. 99)
(50 SX)
– Check/set the carburetor components.
( p. 98)
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