19 TROUBLESHOOTING 90
Faults Possible cause Action
Engine turns but does not start Operating error – Carry out the start procedure. ( p. 22)
Motorcycle was out of use for a long
time and there is old fuel in the float
chamber
– Empty the carburetor float chamber.
( p. 85)
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.
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. 83)
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. 49)
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. 51)
Fault in ignition system – Check the ignition system.
Diaphragm or reed valve housing
damaged
– Check the diaphragm and reed valve housing.
Engine stalls or is popping into the
carburetor
Lack of fuel –
Turn handle
1
of the fuel tap to the ON posi-
tion. (Figure K00858-10 p. 13)
– Refuel. ( p. 25)
Engine takes in bad air – Check the intake flange and carburetor for
tightness.
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 leakage.
– Check the coolant level. ( p. 78)
Too little air stream – Switch off engine when stationary.
Radiator fins very dirty – Clean the radiator fins.
Foam formation in cooling system – Drain the coolant. ( p. 78)
– Refill with coolant. ( p. 79)
Damaged cylinder head or cylinder
head gasket
– Check the cylinder head and cylinder head gas-
ket.
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