1997 "EU" Johnson Evinrude 5 thru 15 Four Stroke Service Manual, P/N 507262, Page 44Get this manual
Idle 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 trailer INote The 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
[] 3Reduce engine speedAdjust the idle speed adjustment knob counterclockwise to the full SLOW position
4Stop 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 necessary