Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 74Get this manual
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TIMING AND SYNCHRONIZATION
a- 250 B.T.D.Cb- Timing Mark of Flywheel 5 With engine in "Forward" gear, fully advance throttle to W.O.TpositionUse timing light and check that timing mark (b) of fly