Troubleshooting - KYMCO GRAND DINK 125 Service Manual

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 reaches
carburetor
Spark jumps
Normal
compression
Engine does not
fire
Dry spark plug
Fuel does not
reach carburetor
Weak or no spark
Low or no
compression
Engine fires but
does not start
Wet spark plug
GRAND DINK 125/150
Probable Cause
ÅEmpty fuel tank
ÇClogged carburetor fuel inlet
tube, vacuum tube or fuel tube
ÉClogged auto fuel valve
ÑClogged float oil passage
ÖClogged fuel tank cap
breather hole
ÜClogged fuel strainer
áClogged fuel filter
àFaulty fuel pump
ÅFaulty spark plug
ÇFouled spark plug
ÉFaulty CDI unit
ÑFaulty A.C. generator
ÖBroken or shorted ignition coil
ÜBroken or shorted exciter
coil
áFaulty ignition switch
ÅStarter motor idles but
crankshaft does not rotate
ÇValve clearance too small
ÉImproper valve and seat
contact
ÑWorn cylinder and piston rings
ÖBlown cylinder head gasket
ÜFlaws in cylinder head
áSeized valve
àImproper valve timing
ÅFaulty auto bystarter
ÇAir leaking through intake
pipe
ÉIncorrect ignition timing
ÑIncorrectly adjusted pilot
screw
ÅFlooded carburetor
ÇFaulty auto bystarter
ÉThrottle valve excessively
open
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