1997 Johnson Evinrude "EU" 90, 105RW, 115, 150, 150W, 175 60 LV Service Manual, P/N 507268, Page 94Get this manual
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4Install the primer hose to the intake manifold
5Install the hose to the balance tube6Install 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 needleRefer to Section 1, Specifications, for initial low-speed setting
INote The 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 unrestrained1Make reference mark on the carburetor body before you disturb the needle adjustment
2Start 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 If the adjustment is too rich, the engine will be rough and unsteady, go to Step 4