1. GENERAL INFORMATION GRAND DINK 250 POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS) Inspection/Adjustment Symptom Probable Cause Check ignition timing Faulty CDI unit Correct timing Incorrect timing Faulty A.C. generator Check carburetor pilot screw adjustment Mixture too rich (turn screw Correctly adjusted Incorrectly adjusted out) Mixture too lean (turn screw in) Check carburetor gasket for air leaks Damaged insulator rubber No air leak Air leaks Carburetor not securely tightened Faulty intake manifold gasket Remove spark plug and Deformed carburetor O-ring install it into spark plug cap to test spark by connecting it to engine ground Faulty or fouled spark plug Faulty CDI unit Weak or inter- Faulty A.C. generator Good spark mittent spark Faulty ignition coil Broken or shorted high tension wire Check carburetor air Faulty ignition switch cut-off valve Damaged air cut-off valve Good Faulty diaphragm Damaged air cut-off valve spring 1-19