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Riding mower backfires, badly

Engine backfires when running

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A backfire typically results from improper air to fuel ratio. An overly lean air-fuel mixture (i.e. an overabundance of air) can lead to a failure to ignite in the combustion chamber, also called a "misfire". The unburnt fuel then enters the exhaust system, where hot components can cause the fuel to ignite unpredictably. Alternatively, rich air-fuel mixtures (i.e. an overabundance of fuel) can result in incomplete combustion, again causing unburnt fuel to enter the exhaust system.

Posted on Apr 23, 2014

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Posted on Jan 02, 2017

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  • 126 Answers

SOURCE: mower backfires and loss of power

i would also check fuel flow. pull the gas line from the carb and see if gas flows out at a good rate (into a metal can of course) or if it trickles out. if the latter, then gas tank either has junk at the bottom preventing the gas from flowing or the vent hole (usually on the gas cap) is plugged.

i have also had my carb float bowl rust out on me, but that took 10 years.

Posted on Jan 29, 2009

  • 1 Answer

SOURCE: gas in the oil in my craftsman 17.5 riding mower

You have a bad antibackfire valve. It is located on carburator below the fuel bowl. You can replace it, or as I advise others, install an inline shutoff valve. Turn the fuel valve on to start it, then turn it off when you shut the engine down.

Posted on Mar 24, 2009

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SOURCE: Riding mower having problems starting then runs roughly

I have a Scotts _ John Deere law mower tractor model S2048-S2554 Serial number 020-001, the engine runs but sounds like it is going to die or it needs air --- it runs unnevenly

Posted on Jul 20, 2009

  • 124 Answers

SOURCE: have a craftsman 18.0hp riding lawn mower. Has a

Most likely it is the governor spring but you could have a stiff throttle shaft or a needle that is not closing properly allowing the carb to flow too much fuel into the engine.

Posted on Sep 20, 2009

RonInFla
  • 86 Answers

SOURCE: i have a riding mower and it runs but lack power

if it's a 2 cylinder (should be) 1 spark plug is fouled out...rule-o-thumb...replace both...that's step 1...

Posted on Apr 28, 2010

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Does the gx 340 have a timing belt. I have a honda 1011 riding mower that backfires when trying to start, the fly wheel sheer pin is ok.


What engine do you have ? Some have a selonoid on bottom of bowl of carburetor if bad can cause your problem.

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Gas in the oil in my craftsman 17.5 riding mower


You have a bad antibackfire valve. It is located on carburator below the fuel bowl. You can replace it, or as I advise others, install an inline shutoff valve. Turn the fuel valve on to start it, then turn it off when you shut the engine down.

Mar 24, 2009 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

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if a camshaft came loose the engine would not run at all. IF engine still runs then i would change the head gaskets. these things **** air and cause backfiring when running. but if engine doesn't run anymore i would look on ebay or craigslist for local mower for parts at least.

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