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#11415264 - 02/15/16 11:06 AM Optimax white smoke
618phoenix Offline
Outdoorsman

Registered: 09/24/04
Posts: 53
Loc: little elm
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.

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#11415582 - 02/15/16 01:24 PM Re: Optimax white smoke [Re: 618phoenix]
forkduc Online   content
TFF Guru

Registered: 03/28/07
Posts: 10857
Loc: Plano,Texas
Bad fuel/oil mix?

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#11418739 - 02/16/16 07:32 PM Re: Optimax white smoke [Re: 618phoenix]
JoeFriday Offline
Pro Angler

Registered: 05/23/13
Posts: 794
Loc: Flower Mound, TX
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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#11419731 - 02/17/16 08:46 AM Re: Optimax white smoke [Re: 618phoenix]
redchevy Offline
TFF Celebrity

Registered: 01/25/05
Posts: 6489
Loc: texas
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.

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#11419781 - 02/17/16 09:04 AM Re: Optimax white smoke [Re: redchevy]
618phoenix Offline
Outdoorsman

Registered: 09/24/04
Posts: 53
Loc: little elm
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.

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#11420040 - 02/17/16 10:36 AM Re: Optimax white smoke [Re: 618phoenix]
BODA Offline
Angler

Registered: 06/10/14
Posts: 282
Loc: Eagle Mountain Lake
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

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#11420245 - 02/17/16 11:49 AM Re: Optimax white smoke [Re: BODA]
JoeFriday Offline
Pro Angler

Registered: 05/23/13
Posts: 794
Loc: Flower Mound, TX
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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#11421398 - 02/17/16 07:45 PM Re: Optimax white smoke [Re: 618phoenix]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10965
Loc: Littlefield Tx & Lake A. H. US...
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.
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