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1. GENERAL INFORMATION GRAND DINK 125/150
TROUBLESHOOTING
ENGINE WILL NOT START OR IS HARD TO START
Inspection/Adjustment Symptom Probable Cause
Check if fuel reaches
carburetor by loosening
drain screw Empty fuel tank
Clogged carburetor fuel inlet
tube, vacuum tube or fuel tube
Clogged auto fuel valve
Fuel reaches Fuel does not Clogged float oil passage
carburetor reach carburetor Clogged fuel tank cap
breather hole
Clogged fuel strainer
Remove spark plug and Clogged fuel filter
install it into spark plug Faulty fuel pump
cap to test spark by
connecting it to engine Faulty spark plug
ground Fouled spark plug
Faulty CDI unit
Spark jumps Weak or no spark Faulty A.C. generator
Broken or shorted ignition coil
Broken or shorted exciter coil
Faulty ignition switch
Test cylinder Starter motor idles but
compression crankshaft does not rotate
Valve clearance too small
Improper valve and seat contact
Normal Low or no Worn cylinder and piston rings
compression compression Blown cylinder head gasket
Flaws in cylinder head
Seized valve
Improper valve timing
Start engine by follow-
ing normal starting
procedure
Faulty auto bystarter
Engine does not Engine fires but Air leaking through intake
fire does not start pipe
Incorrect ignition timing
Incorrectly adjusted pilot screw
Remove spark plug and
inspect again
Flooded carburetor
Dry spark plug Wet spark plug Faulty auto bystarter
Throttle valve excessively
open
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