Mercury Mariner Outboards 45 Jet 50 55 60 HP Models Service Manual, Page 69Get this manual
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4 Hold throttle arm at idle positionAdjust cam follower so that clearance of .005 in.040 in0.13 mm-1.02 mm) exists between roller (e) of cam follower and throttle cam (f)Tighten screw (a) securing cam