Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 74Get this manual

Mercury Mariner 4, 5, and 6HP 4-Stroke Factory Service Manual, Page 74

TIMING AND SYNCHRONIZATION
Ignition Timing
TDC Timing Mark Alignment
IMPORTANT: As this ignition system is fixed, no adjustment to ignition timing is possibleIf ignition timing is not within specifications, refer to "Test Procedures" following to locate faulty component(s)1Remove spark plug2Install dial indicator through spark plug opening in cylinder head
91-58222A1

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