1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 239Get this manual
ATTACHING and ADJUSTING THROTTLE CABLE IStart engine and adjust engine idle RPM to 550600 RPM in forwa rd gear2Shift remote control inlo neutral posit ion3Attach thrOllle cable to engine th rott le lever anc hor pin and secure wi th latc h4Wit end of IhrOlile cable connected to th rall Ie lever, hold thro ttle lever against idle slopAdjust throttle cable barrel to sli into bar rel retainer on cable anchor bracket with very light prel oad of thra ll Ie lever against idle lopLock barrel in place5Check preload on thrott le cable by placing thin pi ece of paper between idle Slop screw and idle SlOp_ Preload is correct when paper ca be removed witho ut tearingbut has some drag on itReadj ust cable barrel, if necessa ry