1991 Johnson/Evinrude EI Outboards 2.3 thru 8 Service Manual, 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 trailerf411sl 2Stop the engine to prevent contact with rotating E.I partsLoosen the two throttle cable nuts and idle speed adjustment screw to allow the ignition plate to contact stop in powerheadf6l 3Start the engine and turn idle speed adjustment screw to allow engine to operate at 700-800 RPMAdjust the low-speed needle until the highest consistent RPM is attainedAllow 15 seconds after each adjustment for engine to respond4After final adjustment is completed, turn low-speed needle counterclockwise one-eighth turn to prevent engine from being too lean at slow speeds, particularly in NEUTRAL1sl 5Reduce engine speed and turn idle speed adjustment to E.I allow engine to run at minimum of 750 RPM in FORWARD gear6Run 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 smoothly7If engine stalls or pops, the mixture is probably too leanTurn the needle counterclockwise one-sixteenth turn Allow 15 seconds after each adjustment for engine to respondObserve engine running qualityIf satisfactory, repeat Step to verify that mixture adjustment is correct8If engine does not respond to adjustments, check engine for other problemsMake sure gasoline is of good quality and mixed with the proper amount of oilThrottle Cable Adjustment 1Rotate twist grip to idle position2With the ignition plate against idle speed adjustment screw, remove slack between end of throttle casing and ignition plate, in the throttle cable by adjusting the two nuts 'f