1993 Johnson Evinrude "ET" 90 degrees CV Service Manual, P/N 508285, Page 38Get this manual
Throttle Cable AdjustmentTTL Models
1al1As you face the steering handle, turn the idle speed adjustment knob counterclockwise to complete slow speed position2Be sure throttle cable bracket is secured to the powerhead using the forward mounting hole 'sl1sl3Back out the idle speed screw and wide open stop
4Turn the twist grip to full open and to full closed positionsCheck the clearance between the roller and end of the cam slotThe roller should be approximately 1f4 in(6 mm) away from both ends of slotwheel to obtain correct adjustmentTighten jam nut after correct adjustment is obtained