1993 Johnson Evinrude "ET" 2 thru 8 Service Manual, P/N 508281, Page 77Get this manual
Carburetor Adjustment2, 2.3, 3.3 Idle Speed Adjustment For accurate results, test run the engine in the water on the customer's boat
i operating temperature before making adjustmentInspect
engine for gasoline leaksf1l2Run engine at slow speed, and adjust the slow speed adjustment screw until the engine runs in the range of 1100-1300 RPMAllow 15 seconds for the engine to respond to adjustmentThrottle Jet Needle Adjustment The carburetor is equipped with throttle valve that uses t=I tapered jet needle to vary the fuel flow as the carburetor is openedNormally, the clip is in the third groove Relocating the clip to the first or second groove of the jet needle will lean the mixtureThe first indication of too rich mixture is decrease in RPM as the carburetor is opened beyond 03 throttleSo, maximum RPM will occur at less than wide open throttleIf the mixture is too rich, change the clip position on jet needle as follows: 1Remove carburetor as described in Carburetor Removal2Disassemble throttle valve assemblyRefer to Carburetor Disassembly3Relocate the clip one groove closer to the flat end of the jet needle4Reassemble the carburetorRefer to Carburetor Assembly5Install carburetor as described in Carburetor'lnstallation