1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 186Get this manual

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Thermal Air Valve Circuit Description
- Fuel Mixture AdjustmentScrew Cap (two)Welch Plug (two)Air Trim Screw (two)Apply Loctite 271 Idle Air Bleed JetThermal Air Valve Air InletEmulsion Tube

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