Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 75Get this manual
Tiller Handle Cable Adjustment 8.0 AND 9.9 HP MODELS WITH SIDE HANDLE SHIFT AND SINGLE ADJUSTMENT MARK PLATFORM 1Position throttle grip to idle position2Check the tiller handle cables for proper adjustmentPointer on bell crank should line up with the adjustment mark shownIf necessary, adjust cables using jam nuts to remove any slack(Do Not Over Tighten Cables)
8.0 HP MODEL WITH TILLER HANDLE SHIFT 1Shift outboard into forward and position the throttle grip to full throttle2Check the tiller handle cables for proper adjustmentPointer on bell crank should line up with the front edge of the housing shownIf necessary, adjust cables using jam nuts to remove any slack(Do Not Over Tighten Cables
aCable Bell Crank PointerAdjustment MarkJam Nuts
aCable Bell Crank PointerFront edge of HousingJam Nuts