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Optimax white smoke #11415264 02/15/16 05:06 PM
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618phoenix Offline OP
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I have a new to me 150 merc optimax that has a white smoke coming out at idle. I am using the DFI oil, I am not sure what was used prior. Could this be causing the smoke or something else? thanks.

Re: Optimax white smoke [Re: 618phoenix] #11415582 02/15/16 07:24 PM
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forkduc Offline
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Bad fuel/oil mix?

Re: Optimax white smoke [Re: 618phoenix] #11418739 02/17/16 01:32 AM
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JoeFriday Offline
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If it's white smoke, could it be a head gasket leaking water into the cylinder? Regardless, I don't think I would run it until you find the source.


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Re: Optimax white smoke [Re: 618phoenix] #11419731 02/17/16 02:46 PM
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redchevy Offline
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Does it do it all the time? Or mostly at start up and goes away as it runs?

In cooler temps exhaust will appear heavier and lighter in color to me just like when you start up your pickup truck on a cold morning.

Re: Optimax white smoke [Re: redchevy] #11419781 02/17/16 03:04 PM
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618phoenix Offline OP
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Originally Posted By: redchevy
Does it do it all the time? Or mostly at start up and goes away as it runs?

In cooler temps exhaust will appear heavier and lighter in color to me just like when you start up your pickup truck on a cold morning.


It does it all the time. I bought the boat in Oct and only had it out once before the past couple weeks. I don't think it was smoking then but not certain.

Re: Optimax white smoke [Re: 618phoenix] #11420040 02/17/16 04:36 PM
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BODA Offline
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wait, don't 2-strokes all smoke? how did the boat run when you took it out? was it running ok?
if I start my boat on muffs, it smokes out the neighborhood

Re: Optimax white smoke [Re: BODA] #11420245 02/17/16 05:49 PM
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JoeFriday Offline
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Originally Posted By: BODA
wait, don't 2-strokes all smoke? how did the boat run when you took it out? was it running ok?
if I start my boat on muffs, it smokes out the neighborhood


The key is the color of the smoke. If it's blueish grey, that's normal. Other colors could indicate problems. I'm guessing Gary is busy getting boats ready for the season. Maybe he'll jump in.


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Re: Optimax white smoke [Re: 618phoenix] #11421398 02/18/16 01:45 AM
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gary purdy Offline
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Run it on the cuff till warm. Pull all of the sparkplugs and crank it over, look for signs of moisture. Some additives will cause white smoke but lots of white smoke is normally a sign of water getting in a cylinder.


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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