1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 214Get this manual
Midsection Adjustments10, 14 Tilt Friction Adjustment
016 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 tilt when hitting an obstruction can do serious damage to your motorSteering Friction Adjustment
l=J Lll 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