1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 37Get this manual

1998 Mercury 9.9/15HP 4-stroke outboards factory service manual, Page 37

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GENERAL INFORMATION
NOTE: Spark plug hole is 12 mm diameterUse Snap-On -Tool MT26-18 adapter with valve core removed
Analysis
Due to standard engine tolerances and engine wear, no cy