1993 Johnson Evinrude "ET" 9.9 thru 30 Service Manual, P/N 508282, Page 219Get this manual
Midsection Adjustments20 thru 30 Steering Friction AdjustmentAdjust steering friction with motor mounted to boat by loosening or tightening screw with screwdriver, as shownSteering friction should be adjusted so that slight drag is felt when turningMinimum friction is required when remote steering is usedThe steering friction screw is not intended to allow "hands off" steeringIdle Speed Adjustment
l= clockwise on the knob increases idle speed, turning counterclockwise decreases idle speedMake certain that throttle is in slow position and the motor is at normal operating temperature before making the idle speed adjustmentMotor should idle at recommended RPM in gearTilt Friction AdjustmentRope and Electric Start Models