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Riding mower, 4cycle engine backfires

Engine backfires, severely

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Backfires are the result of an improper air fuel mixture. 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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SOURCE: After running husquavarna riding

I had the same issue and after trying everything I tokk the gas cap off and noticed there was negative pressure in the fuel tank when I broke the seal... I'm pretty sure the gas cap was just too tight, I threaded it back on but did not torque it down and the mower is running fine.

Posted on Jun 16, 2011

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SOURCE: my lt 1000 17.5 hp riding mower will backfire once in awhile when starting but runs fine once it starts. why

first smell the oil is there a gas smell to it?the needle valve maybe dripping fuel and over flowing into the intake

Posted on Apr 19, 2012

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1 Answer

Why does my 318 lawn mower back fires


Charlene: According to https://www.briggsandstratton.com/us/en/support/faqs/engine-backfire-afterfire " What causes a small engine backfire & how do I fix it? Backfire typically occurs when the engine is decelerated rapidly.

Common Causes of Backfire:

  • Lowering engine speed too fast
  • Gasoline, which contains higher blends of alcohol
  • Carburetor adjustment set too lean
  • Muffler construction can induce backfire
  • Higher than normal engine temperatures
  • Some carburetors can induce backfire due to the sensitivity of internal transitional passages
    (This condition cannot be corrected).

Possible Fixes for Backfiring:

  • Lower engine speed slowly
  • Follow small engine fuel recommendations and/or switch to brands with low or no alcohol
  • Adjust carburetor for optimum performance
  • Inquire with equipment manufacturer about increasing air volume to decrease engine temperature"
Charlene: I hope that helps! :)
Charlen

May 28, 2015 | John Deere Garden

1 Answer

Riding mower backfires, badly


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.

Mar 31, 2014 | Garden

1 Answer

Backfire smoke


This could possibly be caused by several things however the most logical and common reason is simply a sheered flywheel key. This will throw the engine out of time allowing it to fire out of sequence when valves are open instead of closed. I hope this helps you and gets you going again.

Oct 01, 2013 | Husqvarna Garden

1 Answer

12 hp briggs backfires doesn't start


This could be a result of several different things, however the most common of these would be a sheered flywheel key. If this is the case it has throwed the motor out of time and is trying to fire while the exhaust valve is open causing the backfire and lack of compression to start. I hope this has helped.

Sep 30, 2013 | Simplicity "Citation 61"" 28-HP Briggs And...

2 Answers

My lt 1000 17.5 hp riding mower will backfire once in awhile when starting but runs fine once it starts. why


first smell the oil is there a gas smell to it?the needle valve maybe dripping fuel and over flowing into the intake

Apr 18, 2012 | Craftsman Garden

1 Answer

Snapper riding mower backfiring


possibly valve clearances are not correct .check an engine manual

Aug 13, 2017 | Snapper Garden

1 Answer

Mower backfired a few times and died it wont run now unless you hold the key on at that time all it does is pops and backfires with every revolution


I would check for water in the carb bowl and also the flywheel key maybe sheared allowing the engine to be out of time with the ignition and cause it to backfire and pop.

May 19, 2010 | Garden

1 Answer

My mower has 53 hrs on it and it would backfire when turnig it off now it just eats engine oil


backfire will be normal if shuting engine off at full throttle. Idle engine down as low as it will go before shuting off and that should stop the backfire. Look under motor at pulley area and make sure there are no oil leaks, if not you have an internal engine problem rings or valve seals.

Mar 10, 2010 | Husqvarna Garden

1 Answer

Mower ran fine a couple days ago. Went to start


Remove the plug, pull the rope several times. Wait about 30 minutes. Put the plug back in. Try again.

Choke off? Use sparingly if at all. If you have a primer button, only press it 5 or 6 times.

Is your plug in good contition? It may need a replacement. Make sure you get the correct plug.

Let me know how this works out.

a

Sep 21, 2009 | Garden

1 Answer

Craftsman mower backfiring


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.

Feb 18, 2009 | Craftsman 24 Hp 48" Deck Yard Tractor

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