1996 Johnson Evinrude "ED" 40 thru 55 2-Cylinder Service Manual, P/N 507124, Page 96Get this manual
6Connect drain hose to air silencer base7Install new air silencer base to carburetor gasket and secure air silencer using new screws8Install air silencer cover using new gasket9Install air silencer screws and secure the air silencer cover10If the slow speed needle adjustment has been disturbed, refer to Carburetor Mixture AdjustmentAll Models Carburetor Mixture AdjustmentAll Models
The slow speed mixture in this carburetor is controlled by an adjustable needle
1Make reference mark on the carburetor body before you disturb the needle adjustment2Tiller modelsas you face the steering handle, turn the idle speed adjustment knob counterclockwise to complete slow speed position3Start the engine and run it in gear at idle speed for three minutesAllow it to reach normal operating temperature If the adjustment is too lean, the engine will sneeze and backfireGo to Step Ifthe adjustment is too rich, the engine will be rough and unsteadyGo to Step 5