Question about Mtd 22" Yard Machine Push Mower

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Spark plugs are being replaces every 3 or 4 mowing

After I mow 3 or 4 times I have to replace the sparks plug so the mower
will start. The plug is black. I am using alot of gas and when it does start black smoke comes out. If this is the carberator tell me where this is located on the mower and how to fix it. Thanks

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  • pbird637 Jul 14, 2009

    It is a Briggs & Stratton mower and don't know about the numbers except it says 4.5 hp. I will bring my book and see if this information is in it. I can not regulate the choke it is preset. I do check the oil and it seems to be ok. Thanks

  • WilyWonka
    WilyWonka May 11, 2010

    MTD mowers use engines from a couple different manufacturers, and the 22" one comes in a few different engine sizes. Does the engine say MTD, Briggs & Stratton, or some other brand? And is it a 139, 148, or 158cc engine? Or some other size?
    The choke might be stuck, which can cause your symptoms. Sometimes the fix can be as simple as finding the choke and tapping gently on it with a wrench.

    Also, how's the oil level? If it's losing oil, you might have a more serious problem than a simple stuck choke.



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Remove the top plastic hood and make sure you clean any grass buildup around the governor, carburetor, recoil fins and especially inside the air cleaner. Many times the air cleaner is plugged with old grass and the motor cannot breath, causing the black smoke. Replace the filter if it has any signs of oil contamination or debris buildup. It's a cheap fix that shouldn't be overlooked.

Posted on Apr 21, 2014

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Again, ensure the choke is being completely opened after the mower is running smoothly. If not , the choke will make black smoke come out of the exhaust, the spark plugs fouled. But also make sure the air cleaner is not blocked with duct or ddebris.

Posted on May 09, 2012

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The carb is located under the aircleaner it sounds like the mower is being fan at full throttle this on some mowers applies the choke try ajusting the throttle to full then slightly back to open choke.

Posted on Jul 14, 2009

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