1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 244Get this manual
Midsection Adjustments10, 14 Tilt Friction Adjustment
916 inwrench to tighten the tilt shaft nut only enough to control the return of the gearcase from TILT to RUN position
DO NOT overtighten, as doing so will increase the pressure required to tilt the motor when an obstruction is hitFailure to ilt when hitting an obstruction can do serious damage to your motorSteering Friction Adjustment
Adjust 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 used The steering friction screw is not intended to allow "hands off" steeringIdle Speed Adjustment