RESTO Merc optimax M2 white smoke and rich fuel smell

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grr02

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Hi all I have a 04 utopia 185. I took my boat out this weekend and saw white smoke coming out from the exhaust when I accelerate. When my boat comes out to plane which is about 10 sec or so then the white smoke disappears. Also lately there is a strong fuel smell coming out of the exhaust when at cruise which is 25mph +. Can any one tell me if this is something of a concern? Also I have seen soot around the exhaust which I never saw. Spark plugs? They have been replace during off season In Jan2017.
 
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