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Cub cadet LTX1046VT white smoke and gas coming from exhaust when first started.

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  • Rodney Carroll Feb 02, 2018

    I agree with some of the other comments. Carb may not be cutting off fuel when mower not in use. This happens a lot when the owner does not run fuel out of carb before storing at end of season. As mentioned before, it is a good idea to install a fuel shut off valve, if at least from having to drain the tank at the end of the season. This is really only a temporary fix. Probably need to clean or replace carb. A real danger exists if fuel gets into crankcase as a result of fuel flow not shutting off. Motor could seize or on rare occasions, explode due to excessive fuel in the crankcase.

    Maintenance if a very good idea too. Regardless or the cost, I would replace plug, filter, and oil at the beginning of season of use. If you can find a station in your area that has "real" gas instead of gas that has an ethanol mix, that would be a tremendous help in that fuel will not break down as quickly.

    Good luck.

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13 Answers

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Bad needle valve or float dumping gas in crankcase and thinning the oil

Posted on Feb 09, 2018

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If it is not affecting the starting or running, then it is most likely not a carby / fuel issue. White smoke is oil, usually caused by over filling, In older engines it can just be seepage past the rings while sitting around, or oil getting sucked from the sump through the breather pipe during running but not enough to notice. Some will drip into the manifold while sitting around and be burned off when first started. Nothing to worry about.

Posted on Feb 06, 2018

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Lots of good answers. But in my opinion your problem is probably just a dirty air filter element. The dirty air cleaner can cause a vacuum in the carburetor that will pull in: 1st, too much fuel; and 2nd possibly a little oil from the oil breather tube.

A little gas gas smell and white smoke is is not a big deal on an older engine.

Constant white smoking is a major issue.In that usually the engine is in need an overhaul, the oil is leaking around the piston rings and/or valve seals. In that event often it is cheaper to buy a new motor than to rebuild the old one. Look online from Harbor Freight or others.

Posted on Jan 31, 2018

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White smoke is indeed burning oil. From my experience with my small 1042ii it is indeed oil. Where is it coming from. Check your valve cover on the sides if the engine. One or both are leaking. The while smile is from oil on your exhaust manifold and when it burns off, no more smoke. Look and see.

Posted on Jan 22, 2018

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I recommend a fuel shut off valve installed in line and shut it off just before you turn off the engine . I will say your carb needle seat seeps and does not shut off fully this causes white smoke and gas smell at start up i also recommend you change you oil after you install the shut off valve

Posted on Jan 21, 2018

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I would try inserting a gas shutoff in the middle of your hardline and shut it off when not in use. You can purchase one for s few dollars. At least try this first before moving on to checking the valves.

Posted on Jan 21, 2018

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I think some of those Kohler 23HP air cooled twin cylinder engines had a oil splash-shield modification recall and you might want to contact your dealer about the recall that Kohler had for that issue.

Posted on Jan 16, 2018

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Check the oil level. White smoke is oil Bruning. Nothing else causes white smoke. Black smoke is over rich fuel mixture most common caused by a blocked air filter in a lawn mower. Over filled oil levels are the most common cause of white smoke. Ironically a blocked air filter can also cause the issue as the engine tries to draw air through the engine sump breather tube and in doing so inhaled oil. If you can tick those of as not an issue the engine is probable in need of new rings.

Posted on Dec 03, 2017

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Sounds like your Cub Cadet needs a complete tune-up (new air filter, sparkplug, choke adjust, etc).
Check your compression for piston ring seal. Do this by screwing a compression tester into the sparkplug hole and turn it over a few times.
You should get at least 90 PSI or more.
125 to 130 PSI is better (check manual for specs).
A low compression reading means your cylinder(s) and rings are worn allowing oil and crankcase gases into the combustion chamber. My guess this is your problem.
I suggest save your pennies towards a new mower.
Alfred Schrader

Posted on Oct 13, 2017

  • BensonMobileAutoRepair&Welding

    I agree that the piston rings need servicing and the intake gasket may be leaking also...too much oil will cause piston rings to fail

  • sreenivask
    sreenivask Dec 15, 2017

    it may be also adulterated oil if engine stops

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Relax! This is a common thing with modern lawn-tractor engines and no cause for concern if the smoke clears up within a couple of seconds after the engine starts. When you shut off the engine, a bit of gas is trapped in the cylinders and condenses as the engine cools. Then, when you start it cold using the choke, the engine is temporarily "rich" and a puff of smoke comes out. The smell of gasoline is caused by the same issue; some of the raw gas is expelled during the first few exhaust cycles and you get a whiff.

Posted on Oct 06, 2017

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Most lawnmowers don't have a radiator and run by magneto. If your getting white smoke and fuel coming out the exhaust it sounds like it's burning too rich. Your spark plug is probably wet and fouled. The carb is too rich letting too much fuel in the cylinder. Note being on a slightly rich side is better than too lean. But not to the point your dealing with. Start with the carb and make sure it's clean and mixture is set right

Posted on Sep 20, 2017

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Carb. Needs needle valve or float repair to keep fuel from flooding. If it does not have shut off valve in fuel line from tank to carb. Install one and ALWAYS close when storing between mowing. .

Posted on Sep 10, 2017

  • Charlie Gibson Feb 09, 2018

    You will also need to drain the oil

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White smoke, depending how much and how long it lasts, could be from simple overnight condensation in the exhaust system = should disappear once warmed up. Or, if the smoke doesn't go away, you could have a blown head gasket which is allowing anti-freeze and water into your cylinders.
Check your radiator / reservoir to see if the level has dropped, or if you are having to add water to it. If so that means (for some reason - Cracked Block ?) the water is getting in.

Posted on Sep 20, 2017

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SOURCE: I cant start my cub cadet cc989

sounds like a plugged high speed jet

Posted on Oct 24, 2008

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SOURCE: white smoke coming from exhaust when accelerating

This is usually an indication of a bad head gasket.I gasket. The white smoke is the coolant leaking out of the engine and winding up in the oil passages, due to a bad head gasket. To confirm this,
1. check oil. Is level increased, or milky appearance?
2. Is coolant level dropping, but u don't see any signs of leaks?
The above indicates a bad head gasket, causing the white smoke u describe. Let me know how u make out.

Posted on Jan 03, 2009

  • 195 Answers

SOURCE: White smoke coming out of the exhaust when starting?

Hello;
Volumes of white smoke is an indication of water in the exhaust. A certain amount of vapor will be present on start up, but if it is different than what has been the norm for this vehicle then a check of the cooling system is in order.
Rich
RPM Northwest

Posted on Mar 25, 2009

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SOURCE: cub cadet 7254 with a 25 hp kawasaki running rough when hot

your carb needs to be either rebuilt or replaced. it is crudded up with lacquer.

Posted on May 10, 2009

ILikeBMW
  • 117 Answers

SOURCE: Blueish white smoke comeing from exhaust

Hello There

White smoke when first started is normal. If white smoke continues you have an internal coolant leak, i.e., cracked head/blown head gasket.
Black smoke is caused by a rich fuel condition.
Blue smoke is caused by oil consumption.

You need to check your oil cap for yellow/white gunk on the cap if you have this then this is a sign your head gasket is cracked. Check to see if your radiator coolant level is down this is also another sign.

Hope this helps. Please don't forget to rate me.

Many Thanks

Posted on May 20, 2009

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