KYMCO VITALITY 50 Manual page 31

2
. GENERAL INFORMATION
ENGINE STOPS IMMEDIATELY AFTER IT STARTS
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.
Remove spark plug and
install it into spark plug
cap to test spark by
connecting it to engine
ground.
Test cylinder
compression (using a
compression gauge).
Check carburetor for
clogging.
Check ignition timing.
Check carburetor air
screw adjustment.
Symptom
Fuel reaches
carburetor
Plug not fouled or
discolored
Good spark
Normal
compression
Not Clogged
Correct timing
Correctly adjusted
Fuel does not
reach carburetor
Plug fouled or
discolored
Weak or inter-
mittent spark
Abnormal
compression
Clogged
Incorrect timing
Incorrectly adjusted
VITALITY 50
Probable Cause
Empty fuel tank
Clogged float valve
Clogged fuel filter
Faulty auto fuel valve
Fouled spark plug
Incorrect heat range plug
Fouled spark plug
Faulty CDI unit
Faulty A.C. generator
Faulty ignition coil
Broken or shorted high
tension wire
Faulty ignition switch
Worn cylinder and piston
rings
Blown cylinder head gasket
Flaws in cylinder head
Faulty reed valve
Seized piston
Clogged carburetor jets
Faulty CDI unit or A.C.
generator
A.C.G. flywheel not aligned
Mixture too rich (turn screw
out)
Mixture too lean (turn screw
in)
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