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mariner f75 rough idle
iv a mariner 2001 f75hp , yamaha powerhead,
engine will start but sometimes stalls ,
idle seem rough for a 4 stroke outboard and i cant turn it down lower than 1100 to 1000 rpm as it will keep getting rougher and stall if i try to get it lower,
when i rev the engine by the carb link rod manually i get a misfire popping sound out from the air box
carbs were clean and balanced
has new plugs and oil,
running on fresh petrol
any thing i can do to rectify this
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