1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 382Get this manual
7Unscrew (counterclockwise) stainless conduit from tiller handle 9Remove cover plate and gasket from tiller handle10Remove bolt from throttle friction assembly
51603Conduit Cover Plate Gasket (below plate) Screws Throttle Friction Assembly Bolt
8Pull throttle cable from tiller handle
11Remove throttle arm, gear assembly and friction device from tiller handleSlide gear cover and friction device off of throttle arm