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Yes. Rough idling can be attributed to many different factors including carburetor jet settings, bad fuel, dirty fuel system, fouled plugs, bad timing, weak spark, high altitude,low cylinder compression, worn rings, poor electrical connections, carbon trail on magneto cap, or even to low of an idle setting.

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Q: Does a mercury 50 Hp outboard run off of all 4 cylanders when it is idling?
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