Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 100Get this manual

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CYLINDER HEAD
VALVE SPRING
17 lbf(74.5 N) 31 Ibf(139 N) Right Hand

Compressed Pressure (Installed) IntakeExhaust: Closed Height 0.965 in(24.5 mm) Open Height 0.709 in(18 mm) D

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