19 TROUBLESHOOTING 79
Faults Possible cause Action
Engine turns but does not start Operating error – Carry out the start procedure. ( p. 20)
Motorcycle was out of use for a long
time and there is old fuel in the float
chamber
– Empty the carburetor float chamber.
( p. 73)
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
Spark plug electrode gap
0.60 mm (0.0236 in)
Fault in ignition system – Check the ignition system.
– Adjust the ignition.
Short circuit cable in wiring harness
frayed, kill switch defective
– Check the kill switch.
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. 72)
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.
– Adjust the ignition.
Engine has too little power Fuel feed interrupted – Check the fuel tank breather.
– Clean the fuel tap.
– Check/set the carburetor components.
Air filter is very dirty – Clean the air filter and air filter box.
( p. 41)
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. ( p. 43)
Fault in ignition system – Check the ignition system.
– Adjust the ignition.
Membrane or reed valve housing is
damaged
– Check the membrane and reed valve housing.
Engine stalls or is popping into the
carburetor
Lack of fuel –
Turn tap handle
on the fuel tap to the ON
position. (Figure S01157-10 p. 12)
– Refuel. ( p. 23)
Engine takes in bad air – Check intake flange and carburetor for tight-
ness.
The connector or ignition coil is loose
or oxidized
– Clean the connector and treat it with contact
spray.
Engine overheats Too little coolant in cooling system – Check the cooling system for leaks.
– Check the coolant level. ( p. 69)
Too little air stream – Switch off the engine when standing.
Radiator fins very dirty – Clean the radiator fins.
Foam formation in cooling system – Drain the coolant. ( p. 69)
– Refill the coolant. ( p. 70)
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