Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 114Get this manual

Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 114

TIMING, SYNCHRONIZING,ADJUSTING
1Attach liming lighll0 #1 spark plug lead
aTiming Light Clamp#1 Spark Plug LeadGround LeadTiming Window-Electric Start ModelsTiming Window-Manual Start Models
2Place the outboard in "Forward" gear and check timing at idle Retarded (If not within specification window, refer to Diagnostic Test Procedures Section 2A

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