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A lawn mower made by the American Company Toro

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White smoke out of muffler once warmed up

My Honda engine on a Toro motor suddenly started billowing white oily smelling smoke out of the muffler. I shut it down, and let it sit for a while. it starts on the first pull, runs fine for about 20 minutes and then starts billowing out white smoke again.

Head Gasket?

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Blue or white smoke coming from your engine usually indicates burning oil, which can be caused by:

Overfilling the crankcase with oil

Incorrect oil grades

Operating engine at greater than a 15 degree angle

Inoperative crankcase breather

Crankcase air leak

Blown head gasket

Worn cylinder and/or rings

Turning/tilting the engine on its side for storage, oil change or any other reason.

Note: If the engine has to be tilted, ensure the spark plug is facing upwards to help prevent oil from escaping the crankcase.

Other reasons for blue or white smoke from engines include exceeding the engine’s oil capacity shown on dipstick, an obstruction in the breather tube (located behind the air filter), damages to the cylinder/piston rings, and more.

Engine oil capacity is dependent on your specific engine model and can be determined by checking the Oil Recommendation FAQ. You can also learn how to check the oil level and change intervals to ensure the engine is running at the correct oil capacity.

How to Troubleshoot Engine Smoking

If you wish to troubleshoot and repair the small engine yourself,

Step 1: Are you tilting the engine or using it at more than a 15 degree angle? Tilting your mower or equipment can cause leaks. Right the machine before moving forward.

Step 2: Checking and changing the oil is an easy troubleshooting technique for this problem. Check to see if the oil is overflowing or you’re using the wrong grade/type.

Step 3: Check the crankcase for leaks.

Step 4: Is the head gasket blown?

Step 5: Are the rings and/or cylinder worn?

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I have a brand new Toro doing the same thing. Runs great then all the sudden it just billows white and blue smoke. Run it for a bit and it comes out of it. Mowed four days ago, no smoke, mowed today got about half way done and poof I filled the neighborhood with smoke.

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