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    1997 Mercury 250 EFI Offshore running rich and smokey!

    Powerhead recently rebuilt. 25 hours on it. Thick exhaust coming out of propeller. Ocean water gets fuel and oil sheen on it when the boat is idling in the slip. Runs rough in low idle (900- 1000 rpms). Runs amazingly well at higher rpms (2000 plus). New plugs and recent service done on VST...
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