1984-1986 Mercury Force 9.9 and 15HP Outboards Service Manual, Page 18Get this manual
CARBURETOR ADJUSTMENTS Throttle AdjustmentProper adjustment of the throttle follower on the throttle cam is important for obtaining good overall running quality, and the best possible fuel
economy
3Start motor and allow to warm up 10 operating temperatureTurn throttle toSHIFT" position Shift motor intoFORWARD" gear and close throttle (turn clockwise) to the lowest reliable throttle setting
II throttle does not close, either Ihe throttle return spring is too weak and should be replaced, or the throttle disc or linkage is binding
1Advance throttle control until enter of foll ower is ined up with mar on camAt this point the throttle should begin to openFigure 5
2If the index mark is not at center of foll wer at poi nt of in itial contactloosen screw securing throttle am to stator plate and pi vot cam out until index mark on cam contacts the follower without throttle shutter movingTighten throttle cam screw3Recheck position of index markAt the point 01 initial contact, the index mark on the throttle cam must line up with center of the followerFigure 5Idle Adjustment