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// 16. DIAGNOSTIC
Faults Possible cause Action
Engine turns but does not start Spark plug oily or wet Clean and dry the spark plug, or change it if
necessary.
Short circuit cable in wiring harness
frayed, kill switch defective, fault in
ignition system
Check the wiring harness. (visual check)
Check the electrical system:
-CDI
-Coil
-Rotor
Water in carburetor or jets blocked Check/set the carburetor components.
Motorcycle was out of use for a long
time and there is old fuel in the float
chamber
Empty the carburetor float chamber.
Valve clearance too little – Adjust the valve clearance.
The engine does not turn when the
starter button is pressed
Battery is discharged Recharge the battery.
Check the charging voltage.
Check the open-circuit current.
Check the stator winding of the alternator.
Main fuse blown Change the main fuse.
Starter relay defective Check the starter relay.
Starter motor defective Check the starter motor.
Engine has no idle Idling jet blocked Check/set the carburetor components.
Adjusting screws on the carburetor
are in turned to the wrong position
Carburetor - adjust the idle speed ( .69).
Spark plug defective Change spark plug.
Ignition system defective Check the ignition coil.
Check the spark plug connector.
Engine does not speed up The carburetor is flowing over be-
cause the float needle is 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 supply 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.
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.
Ignition system defective Check the ignition coil.
Check the spark plug connector.
Noticeable wear Overhaul the engine.
Clutch engagement speed too low or
too high
Check the clutch setting.
Valve clearance too little Adjust the valve clearance.
Engine stalls or is popping into the
carburetor
Lack of fuel Fill up with fuel. ( . .37)
Engine takes in bad air Check the intake flange and carburetor for
tightness
The connector or ignition coil is loose
or oxidized
Clean the plug-in connection and treat it with
contact spray.
White smoke emission (steam in
exhaust gas)
Damaged cylinder head or cylinder
head gasket
Check the cylinder head or cylinder head
gasket.
Battery is discharged Battery is not charging Check the charging voltage.
Check the stator winding of the alternator.
Unwanted power consumer Check the open-circuit current.
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