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Sputter black smoke

My honda lawn mower starts strong but smokes black then starts to run at a low power like its going to stall

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  • 340 Answers

Austin I think you have to much oil in it. So much its's interferring with the air intake. Drain some oil and clean the air filter. When you have done this give it an hour to settle then run it for a bit to burn the residue of oil off. John

Posted on Jul 09, 2013

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Posted on Jan 02, 2017

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SOURCE: Murray 4.5 hp Q lawn mower runs rough and smokes.

White smoke indicates that it is burning oil. The smoke would be black if it was running rich. So probably the rings will need to be replaced eventually. These mowers are prone to problems but the carbie is least likely to be the problem. So before you adjust the carbie take the cover off the top and give it a good clean and check that all the hoses are connected and are not cracked. Then make sure the airfilter is clean, blow it out with an air compessor or better still get a new one. Then try it out agian. If this doesn't help there is two screws on the carby marked L and H. Turn these only 1/8th of a turn at a time and note or make their current position. Start with the H scew with the mower at full revs. Turn anti clockwise untill you get max revs then turn it back a bit. Running too lean will over heat the motor and damage it. Then if needed adjust the L (or Low)screw. If you get black or grey smoke when you push the throttle up from idle to full its too rich so turn clockwise. If if slows before it picks up to full revs turn anti clockwise.

Posted on Sep 06, 2009

  • 1 Answer

SOURCE: My lawn mower doesn't start and when it does, smoke comes out of exhaust

I used my mower two weeks ago. Now it won!t start, I check the air filter,change the gas, check the
spark plug and it was soaked with gas. I clean the plug and set the gap and it still won!t start. It
sound like it wants to start but it will not start.

please answer me fast
Thank you very much

Posted on Sep 17, 2008

  • 37 Answers

SOURCE: Heavy smoke when you first start the engine

Hi. sounds likes too much oil in engine or if you tilt the mower up&down or side to side.
if you need more help, just write again

Posted on Nov 21, 2008

SOURCE: Mower smoking and sputtering.

Sounds like the engine is getting flooded because the carburetor float needle is not seating. Let me know if this helps.donnyb60

Posted on Mar 23, 2009

  • 1 Answer

SOURCE: I have a Craftsman 650 series lawn mower. It

I have a similar issue in that my Craftsman 650 in that it sputters and smokes out of the muffler and spits oil out from there as well. It does not die, but I cannot operate the lawn mower with all the smoke and oil blowing out. Plus, I get oil leakage on the deck of the lawn mower (top). What would I check for here?

Posted on Mar 28, 2010

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I have a Craftsman 650 series lawn mower. It starts but sputters and smokes and finally dies. I replaced the spark plug and checked the oil but it did not help. What do I need to do now??


I have a similar issue in that my Craftsman 650 in that it sputters and smokes out of the muffler and spits oil out from there as well. It does not die, but I cannot operate the lawn mower with all the smoke and oil blowing out. Plus, I get oil leakage on the deck of the lawn mower (top). What would I check for here?

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