1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 101Get this manual

1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 101

TIMING, SYNCHRONIZINGADJUSTING
Maximum Timing Adjustment
1Connect timing light to No1 (top) spark plug lead2With engine in Forward gear, fully advance throttle to WOT (Wide Open Throttle) position3Adjust maximum spark advance screw to align the 36 BTDC (Before Top Dead Center) timing mark on flywheel with timing pointerTighten jam nut if so equipped4Adjust low speed mixture screwRefer to Section 3A-Carburetor AdjustmentsaMaximum spark advance screwJam nut

Idle Timing Adjustment

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