1992 Johnson/Evinrude EN 2.3 thru 8 outboards Service Manual, Page 47Get 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 r:;l 2Run engine at slow speed (700-800 RPM) and adjust the low-speed needle until the highest consistent RPM is attainedAllow 15 seconds after each adjustment for engine to respond3After tinal adjustment is completed, turn low-speed needle counterclockwise one-eighth turn to prevent engine from being too lean at slow speeds, particularly in NEUTRAL1sl 4Reduce engine speed and turn idle speed adjustment to allow engine to run at minimum of 625 RPM in FORWARD gear5Run engine in gear at or near full throttle for one minutePromptly reduce speed to SLOW (700-800 RPM) and shift into NEUTRALEngine should continue to run smoothly6If engine stalls or pops, the mixture is probably too leanTurn the needle counterclockwise one-sixteenth turnAllow 15 seconds after each adjustment for engine to respondObserve engine running qualityIf satisfactory, repeat Step to verify that mixture adjustment is correct7If engine does not respond to adjustments, check engine for other problemsMake sure gasoline is of good quality and mixed with the proper amount of oil