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  1. J

    2014 merc 20hp 4 stroke....rough mid throttle??

    Hey, I have a 20hp 4 stroke merc carb outboard. Engine starts fine...idles smooth forever..well troll at idle forever. Runs strong and smooth wide open. But somewhere between 10 percent throttle 30 percent throttle it runs very rough and sporadic. Looked at the plugs...top cylinder light and...
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