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My briggs and stratton mower keeps back firing when its running. what is wrong with it?

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  • 17 Answers

Could be the carburetor is dirty or the flywheel key is sheared.

Posted on Mar 18, 2013

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Posted on Jan 02, 2017

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  • 86 Answers

SOURCE: Briggs & Stratton engine on Murray lawn mower

I always replace the air filter if its a paper element, and even if its a foam element I replace it rather than clean it. That said, engine stumbling is rarely and air flow problem - but it could be, so having a new filter assures no air restrictions.

I would drop the carbuerator bowl. On the bottom of the carb, near where the fuel line comes into the engine, should be a nut. Removing this nut allows the bowl to drop off the carb. Some engines the bowl screws off, you will have to look at the bowl. Often the bowl has sediment or sludge buildup inside. Cleaning the bottom of the bowl can prevent that sludge/sediment from plugging the intake tube. Even on newer mower models this is a common problem, the gas line tubing interior breaks down and the inside of the tubing can start degrading - ending up in the bowl as sludge.

After cleaning the bowl, I would add one ounce of fuel line cleaner to a full tank of fuel and run the entire tank of fuel. This will clean any deposits or "varnish" from the interior carb parts. Doing this and the first step will assure your carb is clean and functioning.

If that doesn't help, then I would look at the spacing between the magneto and coil assembly. If you want to do that I'd like you to write down all the model numbers and serial numbers on the engine nameplate, that way I can give you specific directions.

Hope this helps,
Gregg

Posted on Mar 29, 2009

  • 166 Answers

SOURCE: Briggs & Stratton Quattro lawn mower

A lot of time when the small motors on these push mowers surge it is a governing spring that is weak or broke. It does not hold enough tension and causes the valve to fluctuate. I have fixed this many time for a relatively cheap amount (under $5).

Posted on Jun 16, 2009

  • 59 Answers

SOURCE: My lawn mower briggs & stratton engine 650 series will not start

check the fly wheel and coil it may have rust on it if so sand it off

Posted on Jun 26, 2009

hunter19_46m
  • 7482 Answers

SOURCE: 4.5 hp Briggs& Stratton push mower will not run

You need to rebuild your carb. The diaphram in the carb has gotten hard and is no longer acting as a fuel pump to pump the fuel to the carb. Get a rebuild kit and a compressor (for compressed air) to blow out the jet passages. It is an medium to easy job, just watch the small parts. ----------------------------------------------------------------------------- Hint: Before you remove your fuel/air jets, bottom them out first and count the number of turns it takes to bottom them out and mark it down for each fuel/air jet. When you go to reinstall the fuel/air jets bottom them out and then back them back out to the number of turns before removal. That way the fuel/air jets are set to the right number of turns when it was running right. Good Luck, I hope this helped Please rate me...Thanks

Posted on Jan 04, 2010

hunter19_46m
  • 7482 Answers

SOURCE: I can crank my murray gas lawn mower 6.5 quantum

Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
Please rate me, Thanks
Good Luck, I hope this helped

Posted on May 15, 2010

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