1993 Johnson Evinrude "ET" 9.9 thru 30 Service Manual, P/N 508282, Page 46Get this manual
Synchronization and Linkage Adjustments20 It is important that this step-by-step procedure be followed in sequence and be performed exactly as written to ensure consistent engine idling and smooth operation throughout the RPM rangeIf equipped, remove both remote control cables from the engine before performing these adjustmentsCam Follower Pickup Point
'111Tiller modelsturn the idle adjusting knob counterclockwise to the full SLOW position2Remote modelsback out the throttle arm stop screw until throttle arm touches screw's mounting bracket3Connect throttle shaft amplifier, like the one shown, to the carburetor throttle shaft
IAl 4Advance the throttle by moving the throttle control lever