TROUBLESHOOTING 72
Faults Possible cause Action
Engine turns but does not start Operating error – Go through the steps of starting the engine.
( p. 15)
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. 66)
Fuel feed interrupted – Check the fuel tank breather.
– Clean the fuel tap.
–
Check/set the carburetor components. x
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. x
–
Adjust the ignition. x
Short circuit cable in wiring harness
frayed, kill switch defective
–
Check the short circuit button. x
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 –
Check/set the carburetor components. x
Engine has no idle Idling jet blocked –
Check/set the carburetor components. x
Adjusting screws on carburetor dis-
torted
–
Carburetor - adjust the idle speed. x
( p. 65)
Spark plug defective – Change 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. x
Loose carburetor jets –
Check/set the carburetor components. x
Fault in ignition system –
Check the ignition system. x
–
Adjust the ignition. x
Engine has too little power Fuel feed interrupted – Check the fuel tank breather.
– Clean the fuel tap.
–
Check/set the carburetor components. x
Air filter very dirty –
Clean the air filter. x ( p. 37)
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. 38)
Fault in ignition system –
Check the ignition system. x
–
Adjust the ignition. x
Diaphragm or reed valve housing
damaged
– Check the diaphragm and reed valve housing.
Noticeable wear – Overhaul the engine.
Engine stalls or is popping into the
carburetor
Lack of fuel – Turn the knurled screw on the fuel tap all the
way counterclockwise.
– Fill up with fuel. ( p. 17)
Engine takes in bad air – Check the intake flange and carburetor for
tightness.
Socket connector or ignition coil is
loose or oxidized
– Clean the socket connector and treat it with
contact spray.
Engine overheats Too little coolant in cooling system – Check the cooling system for leakage.
– Check the coolant level. ( p. 63)
Too little air stream – Switch off engine when standing.
Radiator fins very dirty – Clean radiator fins.
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