1998 Johnson Evinrude EC 5 thru 15 HP Four Stroke Service Manual, Page 240Get this manual
COA2674
Twist-Grip Throttle Service56
Disassembly
1Using OMC Twist-Grip Throttle Remover, PIN 390767, depress the grip detentsTighten screw and remove the grip by pulling grip and turning the idle adjustment knob clockwise
rn 2Remove the helix halvesrollersand guides rn 3Remove throttle friction control and handle cover[]