DAELIM BESDI 125 - SERVICE, Service Manual

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19-1
TROUBLESHOOTING
19. TROUBLESHOOTING
ENGINE WON’T START OR HARD TO START
CAUSE OF TROUBLE
No fuel to fuel tank.
Disconnected or damaged fuel pump
negative pressure tube.
Clogged fuel tube.
Clogged float valve.
Clogged fuel strainer.
Clogged fuel tank cap.
Fuel pump malfunction.
Faulty spark plug.
Contaminated spark plug.
Faulty A.C. generator.
Disconnected or shorted high
tension cord.
Disconnected or shorted ignition coil
wire.
faulty ignition switch.
Faulty CDI unit.
Seized piston ring.
Faulty valve clearance adjustment.
Worn cylinder or piston ring.
Leaking cylinder gasket.
Warped or cracked cylinder head or
cylinder.
Carbon deposited on spark plug.
Idle speed misadjusted.
Faulty ignition timing.
Clogged air cleaner.
Lean fuel mixture.
Flooded carburetor.
Throttle valve excessively opened.
Contaminated or clogged air cleaner.
Rich fuel mixture.
Recheck the engine.
Open the drain screw, and check fuel
flow to the carburetor.
Check the spark plug.
Measure the cylinder compression.
Start the engine in the following
procedure.
Remove the spark plug, and recheck it.
Restart the engine in the following
procedure.
Completion
ENGINE WON’T START OR HARD TO START 20-1
ENGINE STALLS, HARD TO START, ROUGH IDLING 20-2
POOR PERFORMANCE AT LOW SPEED AND IDLING 20-3
POOR OPERATION 20-4
Fuel is supplied
Good spark
Compression normal
Engine won’t start.
Dry spark plug
Fuel not supplied
to the carburetor.
Weak or no spark.
Low or no cylinder
compression.
Engine starts but
stops immediately.
Spark plug wet.
Engine won’t start.
Engine starts