1. GENERAL INFORMATION DINK50/125 POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS) Inspection/Adjustment Symptom Probable Cause Check ignition timing Faulty ignition unit Correct timing Incorrect timing Faulty A.C. generator Check carburetor pilot screw adjustment Mixture too rich (turn screw out) Correctly adjusted Incorrectly adjusted Mixture too lean (turn screw in) Check carburetor gasket for air leaks Damaged insulator rubber Carburetor not securely tightened No air leak Air leaks 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 ignition unit Faulty A.C. generator Good spark Weak or inter- Faulty ignition coil mittent spark Broken or shorted high tension wire Faulty ignition switch Check carburetor air cut-off valve Damaged air cut-off valve Good Faulty diaphragm Damaged air cut-off valve spring 1-37