Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 74Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 74

TIMING AND SYNCHRONIZATION
Check Timing
1Connect timing light (91-99379) 10 engine2Start engine and allow it to warm up to normal operating temperature3Throttfe engine back to idle and shift into "Forward" gear4With engine idling in "Forward" gear, use timing light and check flywheel timing mark alignmentIdle timing should be 25 B.T.D.C

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