White smoke oil fill cap - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 05-21-2014, 10:22 AM Thread Starter
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White smoke oil fill cap

After a 20 mile ride to work, an 8 hour shiftI, and 20 miles home, I opened the oil fill cap for the third time and noticed for the third time, a light white smoke in the crank case. Very similar to water about to boil, where the vapor just wisps on top of the water.

Coolant level hasn't changed (that I know of - - the overflow hasn't moved, but that's not to say I'm losing coolant.... However, no heating issues at all) and I don't know what else it could be.

Next move is to remove the crankcase vent breather and route a tube up to a clean place and leave it open.
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post #2 of 8 (permalink) Old 05-21-2014, 10:23 AM
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I had the same thing happen a few times after an oil change. Some wispy smoke came from the vent breather, but it went away shortly after and has not returned.

It could also be the stator cooking..

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
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Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
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1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

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1989 Pontiac Firebird Formula 350
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post #3 of 8 (permalink) Old 05-21-2014, 10:32 AM Thread Starter
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It better not be my new tpe stator burning!
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post #4 of 8 (permalink) Old 05-21-2014, 10:44 AM
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Note the outside temperature, humidity and pressure. More than likely, it's just atmospherics and will go away in a day or so. Probably not Global warming.

Water vapor condenses into the oil and sometimes when it gets hot you see this. On Harleys, you really have to get the oil up to above the boiling point of water to make sure the internals stay corrosion free. However, some ding dong put my boiling oil tank directly under my ass on my Sportster. What were these engineers smoking?

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Last edited by Goofyfoot2001; 05-21-2014 at 10:50 AM.
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post #5 of 8 (permalink) Old 05-21-2014, 11:28 AM Thread Starter
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It has been present for the better part of the week (that I know of) and with reference to volume, I'd say if it's water vapor it's about a quarter to half cup of water, converted to steam
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post #6 of 8 (permalink) Old 05-21-2014, 11:35 AM
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Quote:
Originally Posted by crowley1027 View Post
It has been present for the better part of the week (that I know of) and with reference to volume, I'd say if it's water vapor it's about a quarter to half cup of water, converted to steam
Put a piece of paper in the refrigerator, quickly pull the oil cap and put the paper over it. Water should condense on the paper. Dunno about all this, but it should. I would use white paper.
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post #7 of 8 (permalink) Old 05-21-2014, 11:52 AM
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So no discoloring of your oil or coolant?

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post #8 of 8 (permalink) Old 05-21-2014, 02:47 PM Thread Starter
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Aside from oil blackening (lol) no. And I haven't checked coolant color. I'm going to do a total coolant system flush (again) when I can buy a jug of water... Maybe this week or next. I'll post results.

I seem to remember a bit of wet fouling on the rear plug... But it was long ago lol.
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