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    25 hp mercury bigfoot vibrates and shakes at idle

    Re: 25 hp mercury bigfoot vibrates and shakes at idle hwindle, I drilled out the plug and sure enough found the air adjustment jet. Turned 1 turn out and she is finally purring like a kitten. It amazes me that a dealer would not have found this problem or known about it. Good luck and...
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    25 hp mercury bigfoot vibrates and shakes at idle

    My engine ran very smooth until this year and starting getting excessive vibration at idle. Mechanic cleaned the carb but I am still not happy with performance. My carb does not appear to have an idle mixture adjustment. Any thoughts?
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