Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 25Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 25

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GENERAL INFORMATION
Summer Conditions of high temperaturelow barometric pressu re and high humidity all combine to reduce the engine powerThi s, in turn, is reflected in decreased boat speedsas