1990 Johnson Evinrude "ES" 60 thru 70 Service Manual, P/N 507873, Page 87Get this manual
Installation 1Install new carburetor flange gaskets dry, use no sealer2Attach primer hoses to carburetor fittings3Install carburetors, lockwashers, and nutsTighten nuts securely4Install fuel supply hoses using new tie straps5Install carburetor linkage Refer to Synchronization and Linkage Adjustments, Section 1, for adjustment information6Connect drain hose to air silencer base fitting7Install base gasket and air silencer base using new screwsTorque the screws to 24-36 inIbs(3-4 Nm)8Momentarily pressurize fuel system and check for leaks9Install the gasket, air silencer cover, and retaining screwsTorque the screws to 24-36 inIbs(3-4 Nm)10If the slow speed needle adjustment has been disturbed, refer to Carburetor Mixture Adjustment Carburetor Mixture Adjustment
The slow speed mixture in this carburetor is controlled by factory adjusted needleThis procedure should only be used if the factory seal is gone or if the needle adjustment has been disturbedf171 1Make reference mark on the adapter sleeve before you disturb the needle adjustment2The boat must be in the water, under normal operating conditions with the correct propeller installedThe boat's movement must be unrestrainedThe boat must not be tied to dock or trailer3Start the engine and allow it to reach normal operating temperatureRun the engine in gear at slow speed (700-800 RPM) for three minutes If the adjustment is too lean, the engine will sneeze and back-fire, go to Step Ifthe adjustment is too rich, the engine will be rough and unsteady, go to Step 5f171 4If the adjustment is too lean, notice your reference mark and turn the needle 112 revolution counter-clockwiseWaiting 15 seconds after each adjustment, repeat this procedure until you reach the highest consistent RPM