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Riding mower smokes excessively under strain or long term useage acts like there might be oil in gasoline but there isn't doesn't kill the motor but looks like it blew up its a 12 hp and briggs and stratton engine

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  • Samuel Charles Spriggs May 11, 2010

    One good-news possibility is that the crankcase has too much oil in it.

    Otherwise, it sounds like it's just worn out (probably the piston rings). How old is it? How many hours do you think it has on it? Does it make any new noises when it's running?



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SOURCE: rally ride on lawn mower not starting. briggs and

i have a rally lawn tractor when i hook up the battery it wants to start key is off only thing i did was change the belt. was working fine before .

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SOURCE: I have a DYT 4000

first check if it is running on both cyl the exaust will be hot on both sides after 1 min i think you might have a bent push rod

Posted on Aug 04, 2010

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SOURCE: Ariens 1640 Zoom Riding Mower with Briggs & Stratton engine smoking

check to see if the oil smells like gas the needle valves go bad in the carb and gas over flows into the crank case also the head gaskets go bad and **** the oil from the crank case

Posted on May 10, 2012

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17hp briggs and stratton shut down while mowing and won't restart. gas in tank is bubbling

Sounds like a blown motor but maybe not.I can take a look at it ifr you like/

Apr 14, 2013 | Garden

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I have a 21 H.P. in my John Deere riding mower and it started blowing blue smoke out of exhaust excessively, I think i might have have blown a valve seal because motor still runs fine, just provides...

first check the oil and sill if it has a heavy gas smell there has been a lot of needle valve problems in carb lately then i would do a compression test they have been known to blow head gaskets and with over head valves there is oil up in the cylinder heads and a valve seal wouldn't be a constent flow of smoke

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Engine smokes for a moment when i start cutting model YT1942T

Is it Blowing White smoke, if Yes then

Use the lawnmower's oil dipstick to determine whether the oil level is correct. Maintain the correct level of oil. If you've overfilled the oil, open the drain plug, and drain some of the oil into a waste container. Dispose of any excess oil properly. Burning off excess oil is undesirable. It can foul the mower's spark plug, piston rings, and other engine components and contributes to air pollution. If your mower's engine has not been overfilled with oil, but still is smoking, it may have stuck or worn piston rings or another maintenance problem.

Some maintenance shops offer a mower transport service. Check to see if this is available in your area.

Jan 24, 2012 | Husqvarna Garden

2 Answers

Put too much oil in toro lawnmower

Hi cldgaines1...
You do not want excess oil in the crancase, it can cause mechanical problems and smoke a lot.
Drain the excess oil out of the crankcase..
If you have an oil drain it will be located under the mower housing.
If you do not have an oil drain then you will have to tilt the mower with the oil filler plug removed to drain the excess oil from the crankcase.
Please take time to rate me.

Jun 27, 2011 | Toro Power Lawn Mower

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John Deere Gx75, kawasaki 9hp motor- oil in carb!

A very common problem with the GX series with Kawasaki engines. The carburetor 'inlet needle' sticks open and fills the crankcase with fuel. When checking the oil, it can be difficult to see the gasoline and the level appears to be OK. Remove the dipstick and smell the oil, you may detect a gasoline smell. Also, drain the oil, and you may find much more fluid than you expect.
The solution on newer mowers was to install an 'in-line' shut-off valve to keep the fuel from syphoning into the carburetor. The inlet needle and seat in the carburetor is NOT replaceable, so a new carburetor is the ultimate solution, but VERY expensive. Installing and using an in-line shut-off valve is more affordable.
Also, this situation is common when machine is transported on a trailer, as the bouncing causes the needle/seat to leak. When transporting, always turn off the fuel supply to the carburetor.

Nov 07, 2009 | Garden

1 Answer

Engine only runs at low idle and smokes

So now, without the blades engaged, it smokes and then dies?
In your first description it sounded like the engine was under a strain. Overfilling with oil could produce a strain, but since it ran ok until you said you engaged the blades, I would have to ask if the blades themselves, were causing the strain. Sometimes if you cut wet grass, the clippings stick to your underside of the deck and can really build up. Also some rope, wire or twine would around the spindles could creat one. Check this out...
Now, with the "smoke" issue (I'm assuming a blue smoke from burning oil) I'm inclined to think your rings aren't compressing any longer and you're burning oil. You might be in for a rebuild... I hope not.

Aug 31, 2009 | Husqvarna 19.5hp 46" Yard Tractor

1 Answer


Empty the tank of the tainted gasoline (Maybe add the right amount of oil and use it for a trimmer, etc), fill tank with fresh gas and clean the spark plug, since it is probably fouled out. You may have to clean the carb with some carb cleaner, and clean your plug a few extra times, but it should be fine. Hope this helps. Good luck.

Jul 15, 2009 | Mtd Yard - Man 160cc, 21" Self - Propelled...

1 Answer

Hard starting smokes white like gas is getting into cylinders

White smoke in a small engine is oil. Oil in the cylinder will create too much pressure for the engine to achieve compression. Make sure the engine is not getting fuel into the oil and thinning the mixture (literally smell the oil... gasoline and oil smell nothing alike, if it smells like gas, it is). If this is the case, the carb is leaking fuel into the engine, thinning the oil and causing the oil to leak past the rings into the cylinder head, through the valves and, from there, into the exhaust to burn off. Black smoke indicates a direct fuel issue in a small engine, white is oil based.

Mar 11, 2009 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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