1993 Johnson Evinrude "ET" 2 thru 8 Service Manual, P/N 508281, Page 45Get this manual
Carburetor Adjustment 1Start engine and run in FORWARD gear at one-half throttle or slightly moreAllow engine to reach normal operating temperature before making low-speed mixture adjustmentsThe boat's movement must be unrestrained, not tied to dock or trailer ill
2Stop the engine to prevent contact with rotating partsLoosen the two throttle cable nuts and idle speed adjustment screw to allow the ignition plate to contact stop in powerhead