2. GENERAL INFORMATION STRYKER 125/150 POOR PERFORMANCE (ESPECIALLY AT IDLE AND LOW SPEEDS) Inspection/Adjustment Symptom Probable Cause Check ignition timing Faulty CDI unit Correct Incorrect Faulty A.C. generator Check carburetor pilot screw adjustment Mixture too lean (turn screw in) Correctly adjusted Incorrectly adjusted Mixture too rich (turn screw out) Check carburetor insulator rubber for air leaks Carburetor not securely tightened No air leak Air leaks Faulty intake manifold gasket Deformed carburetor O-ring Broken vacuum tube Remove spark plug and install it into spark plug cap to test spark by making it contact the engine Faulty or fouled spark plug Faulty CDI unit Weak or inter- Faulty A.C. generator Good spark Faulty ignition coil mittent spark Broken or shorted high tension wire Faulty ignition switch Check A.C. generator Faulty A.C. generator Good Faulty Damaged vacuum tube Clogged air vent hole 2-25