1995 Mariner Mercury Outboards Service Manual 50HP 4-Stroke, Page 105Get this manual
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Adjusting Valves NO.3 AND NO.4 INTAKE VALVES NO.2 AND NO.4 EXHAUST VALVES 1 Turn the driven gear and align the "4" mark on the gear with the the cylinder head 2 Adjust the valve clearance for NO.3 and