1998 Johnson Evinrude EC 5 thru 15 HP Four Stroke Service Manual, Page 247Get this manual
Midsection AdjustmentsAll Models Tilt Friction Adjustment
Use 916 inwrench to tighten the tilt shaft nut only enough to control the return of the gearcase from TILT to RUN position Steering Friction Adjustment Adjust steering friction with motor mounted to boat by loosening or tightening screw with screwdriverSteering friction should be adjusted so that slight drag is felt when turningMinimum friction is required when remote steering is usedDo not overtightenThe steering friction screw is not intended to allow "hands off" steeringIdle Speed Adjustment
The idle speed adjustment knob is located on the steering handleTurning the knob clockwise increases idle speed, turning it counterclockwise decreases idle speed Make 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 gear