1998 Johnson Evinrude "EC" 9.9 thru 30 HP 2-Cylinder Outboards Service Manual, Page 48Get this manual
Synchronization and Linkage Adjustments -
INote 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 range
INote If equipped, remove both
remote control cables from the engine before performing these adjustments
Cam Follower Pickup Point
1Tiller ModelsTurn the idle adjusting knob counterclockwise to full SLOW position2All ModelsLoosen locknut and back out throttle arm stop screw until throttle arm touches screw's mounting bracket
3Connect throttle shaft amplifierlike the one shown, to the carburetor throttle shaft4Advance the throttle by moving the throttle control lever until tip of the amplifier begins to moveAt this point, the cam follower should contact the cam between the two marks
[] 5To adjust, loosen the screw retaining the adjustment lever to the throttle shaftSlide the adjustment lever up or down to make the adjustmentThrottle Control Rod