KYMCO SUPER8 50 Service Manual page 22

1
. GENERAL INFORMATION
TROUBLESHOOTING
ENGINE WILL NOT START OR IS HARD TO START
Inspection/Adjustment
Check if fuel reaches
carburetor by loosening
drain screw
Remove spark plug and
install it into spark plug
cap to test spark by
connecting it to engine
ground
Test cylinder
compression
Start engine by follow-
ing normal starting
procedure
Remove spark plug and
inspect again
Symptom
Fuel does not
Fuel reaches
reach carburetor
carburetor
Spark jumps Weak or no spark
Normal
compression
Engine fires but
Engine does not
does not start
fire
Wet spark plug
Dry spark plug
Probable Cause
Empty fuel tank
Clogged fuel line between fuel
tank and carburetor
Clogged float oil passage
Clogged fuel tank cap breather
hole
Clogged fuel filter
Clogged fuel strainer
Faulty auto fuel
Faulty spark plug
Fouled spark plug
Faulty CDI unit
Faulty pulser coil
Broken or shorted ignition coil
Broken or shorted high-tension
wire
Faulty ignition switch
Faulty starter clutch
Valve clearance too small
Improper valve and seat contact
Low or no
Worn cylinder, piston and piston
compression
rings
Leaking cylinder head gasket
Seized valve
Improper valve timing
Faulty auto bystarter
Air leaking through intake pipe
Incorrect ignition timing
Incorrectly adjusted pilot screw
Flooded carburetor
Faulty auto bystarter
Throttle valve excessively open
SUPER8 50
valve
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