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) 2-26