1990 Johnson Evinrude "ES" 9.9 thru 30 Service Manual, P/N 507871, Page 189Get this manual
Twist Grip ServicingAll Models
Disassembly
rv grip detentsTighten Grip Removerremove the grip by pulling 1Using OMC Twist PIN 390767, depress the L!J screw and
grip and turning the idle adjustment knob