1989 Johnson Evinrude "CE" 9.9 thru 30 Service Manual, P/N 507754, Page 216Get 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 tilt when hitting an obstruction can do serious damage to your motorSteering Friction Adjustment