1995 Johnson/Evinrude Outboards 9.9, 15 four-stroke Service Manual, Page 36Get this manual
Synchronization and Linkage Adjustments Tiller Models INote You must perform this step-by-step procedure exactly as
written to ensure consistent engine idling and smooth operation throughout the RPM rangeIdle Speed 1The 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 trailerI NoteThe idle mixture in the carburetor is controlled by factory
adjustment to meet current emission standardsThe adjustment should only be disturbed for cleaning or rebuilding purposesIf the adjustment has been disturbed, refer to Carburetor Adjustment, Section 22Start the engine and allow it to reach normal operating temperature
[]J 3Reduce engine speedAdjust the idle speed adjusting knob counterclockwise to the full SLOW position4Stop the engineRemove the screw and washer retaining the throttle cable bracket 5Pull on throttle cable casing to move the throttle cam away from the cam follower roller6Connect your shop tachometer pickup on the ignition coil's primary lead, and set its selector switch on 2-cycleStart the engine and verify idle speed in FORWARD gear7Stop the engineAdjust the idle speed screw to achieve 850 50 RPM in FORWARD gear8Start the engine and verify your adjustmentRepeat Step 7, if necessary9Stop the engineRotate twist-grip to full SLOW positionPull on throttle cable casing to remove throttle cable backlashAdjust the throttle cable bracket to provide 132 in(0,8 mm) gap between the throttle cam and cam follower roller when the throttle cable bracket is installed10Install the throttle cable bracket with screw and washerTighten screw to 48-96 inIbs(5,4-10,8 Nm)Verify clearance between throttle cam and cam follower roller