Mercury Force 9.9, 15HP Outboards Service Manual, Page 39Get this manual

Mercury Force 9.9, 15HP Outboards Service Manual, Page 39

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3 Tighten screw in swivel
NOTE: The throttle shaft must move as soon as the throttle linkage begins to moveIf not, repeat steps 1-3
NOTE: The late 1990 and all 1991 and newer 9.9 and 15 H.