Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 102Get this manual

Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 102

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Carburetor Adjustments Pilot Mixture Screw
IMPORTANT: When checking float level, the float should be resting on the needle valve, but not compressing the needle valve2 If float level is not with