Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 82Get this manual

Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 82

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Idle Jet The idle jet meters fuel-air mixtureIf jet with small orifice is installed the id le fuelai ratio becomes leanerIf jet with larger orifice is installed the idle fuelair ratio becomes richer