Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 138Get this manual

Mercury Mariner Outboard 40/50/55/60 2-stroke Service Manual, Page 138

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Main (High Speed) Jet Adjustment The carburetor has fixed high speed jetExtreme changes in weather (temperature and humidity) and or elevation may result in too lean or rich fuel mixture at wide-open-

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