Question about Briggs & Stratton Briggs Stratton Lawnmower Lawn Mower Short Block

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Briggs stratton backfires thru exhaust

If you apply choke backfiring stops

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  • Paul Bade May 12, 2014

    Hi walter lowe, I want to help you with your problem, but I need more information from you. Can you please add details in the comment box? Are you having explosions in the muffler while the engine is supposed to be running, or is the engine dieseling (run-on) after you have turned off the ignition? Backfiring is fuel-air ignition in the intake manifold/carburetor section.

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 18hp twin cylinder Briggs & Stratton backfire

Check to see if the carb is clean, if so the anti diesel value could not be working. Apply 12 volts to value and see if it move's. If that works then you may what to check the fuel pump and see if it pumps. After you tried all that then you may have change the main jet size because these engines come with a small jet for the EPA.

Posted on Apr 23, 2010

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2strokeguy
  • 183 Answers

SOURCE: I have a briggs and stratton quicksilver, just got

Not to worry. When you tipped the mower on its side, oil ran into the exhaust. Allow the engine to run few minutes and it will stop smoking. The B&S engine will put oil in the muffler if tipped to the left, and oil into the carburetor if tipped on the right. The only safe way to tip the engine is where the spark plug is pointed upward.
Don't forget to check your oil level and adjust as necessary.
Good luck!

Posted on Sep 05, 2010

Testimonial: "i will try what you suggested, i did tip it on the side you described, but thought engine had gone... it still runs so you must be right thankyou"

  • 111 Answers

SOURCE: I have a 5.5 OHV Briggs & Stratton and it only

The carburetor needs to be cleaned. There is something in one of the passages that is keeping it from running correctly. To do this you will need a can of carburetor cleaner (spray) and a very thin wire to probe in all of the holes of the carburetor. First, take the carburetor loose from where it mounts to the engine. Then take the wire and probe all of the holes in the carburetor, and also the holes in the fuel bowl nut (if any are present). Then shoot the carburetor cleaner through the holes to remove any loose particles of dirt or debris and to make sure the passages are clear. After you have done this, then you will need to blow through the holes to make absolutely sure that everything is removed that could be blocking either fuel or air from passing through the carburetor. Re-install the carburetor back onto the engine, and check to see if the unit is running ok. If at this point the carburetor is still not running correctly, you may have to replace the carburetor. When you go to the parts counter you should have the MODEL, TYPE, and CODE off of the flywheel housing. These numbers are stamped into the metal. I hope this helps you out.

Posted on Apr 07, 2011

hunter19_46m
  • 7482 Answers

SOURCE: Briggs & Stratton Model 92502 3.5 HP Engine with

Hi hjconn...

Sounds like you have dirt/debris in your carburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
NOTE: Before you dissemble the carburetor:
Make sure you mark each piece with a awl, or some kind of instrument that will make an alignment scratch before you dissemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Also check you fuel line condition after a while they will degrade and need replacment.
Make sure you are getting spark at the spark plug, to do this:
Remove your spark plug and check to be sure you are getting fire at the spark plug.
You do this by grounding the plug on the head of the engine and pulling the crank rope, if you are getting spark then:
Check/Clean/Replace your fuel filter if you have one, normally they are located in the fuel tank of weedeaters.
When you remove your fuel lines from the carburetor be sure to make a drawing to how the lines are connected to the carburetor.
Normally the big line will be the line the fuel filter is connected to inside of the tank.The smaller of the two lines is the return to the fuel tank from the carburetor after it is pumped thru the carburetor by the primer bulb.
Also make sure you are using fresh fuel...and oil mix if your using a two cycle mower or weedeater with the oil to the right mixture and not too much oil as it can cause hard starting.
If the mower/weedeater is over a couple of years old, then I 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.
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid 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.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Once you have your carburetor rebuilt that should solve your problem.
This is a FREE answer,Please take time to rate me

Posted on Jun 25, 2011

Knucklebstr
  • 222 Answers

SOURCE: I stored my Briggs and Stratton Murray 4.5

Just let the mower sit on the level for a while. Then be sure to check the oil level before starting the engine. It'll probably blow some oil smoke, but then it should clear up and be fine. You should only tip your mower in one direction, ever. That is down on the handlebars; up on the front. This way, the fluids have no where to run. Also be sure the gas tank is not full or fuel will run out the vent in the cap.

Posted on Nov 11, 2011

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