Mercury 500 50hp smokes/steams

countryguy349

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Joined
Jun 4, 2012
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1
I can run it all day long at any rpm range with the ear muffs on, but as soon as I put the boat in the water and get going it starts smoking, and seem to be blowing steam out of the water discharge. I'm pretty new to boating but I am mechanically inclined, just looking for a good starting point. Already installed a new impellor and gave it a tune-up. Would it have anything to do with ethanol fuel? Thanks everyone any help will be greatly appreciated!
 
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