1994 Johnson Evinrude "ER" 60 LV 150, 150C, 175 Service Manual, P/N 500611, Page 82Get this manual
401 4Install the primer hose to the intake manifold5Install the hose to the balance tube 1411 6
Install and secure the main fuel supply hose to the carburetor fuel manifold
7To accurately adjust all carburetor linkage, refer to Synchronization and Linkage Adjustment, Section 1
Carburetor Mixture Adjustment
The slow speed mixture in this carburetor is controlled by an adjustable needleThe needle's initial reference setting is three turns off its seatThe engine must have exhaust back-pressure to respond correctly to carburetor mixture adjustmentsThe engine must be in the water at neutral trim angle, with the correct propeller installedThe boat's movement must be unrestrained
1421 1Make reference mark on the carburetor body before you
disturb the needle adjustment2Start the engine and allow it to reach normal operating temperatureRun the engine in FORWARD gear at the specified idle speed for three minutes: If the adjustment is too lean, the engine will sneeze and backfire, go to Step Ifthe adjustment is too rich, the engine will be rough and unsteady, go to Step 4If the adjustment is too lean, notice your reference mark and turn the needle 18 revolution counterclockwiseWaiting 15 seconds after each adjustment, repeat this procedure until you reach the highest consistent RPMand turn the needle 18 revolution clockwiseWaiting 15 seconds after each adjustment, repeat this procedure until you reach the highest consistent RPM5Repeat Steps thru for each carburetor6To test your adjustment, run engine near full throttle for three minutesReturn the engine to idle in gearThe engine should maintain smooth idle RPM If your test results vary, repeat Steps thru 4If the engine does not respond properly to these adjustments, check the following: Engine temperature Linkage adjustment External recirculation system Sufficient exhaust back pressure