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