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Lawn mower backfire

I have a '04 murry with the 13.5 hp OHV motor. just replaced the coil and flywheel key and backed off the intake valve adjustment. I am still getting a lot of backpressure from the intake. engine is running but very loud and not very fast

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Intake adjustment should be set at .004. if not , the valve will blow back through the carb and run slow.

Posted on Jul 01, 2014

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Posted on Jan 02, 2017

  • 508 Answers

SOURCE: 17 HP Briggs & Str lawn mower engine that is smoking a lot -

compression test it can either rent or buy one should be over 90psi!!!

Posted on Jun 28, 2009

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SOURCE: lawn mower not running

sounds more like the carb sucked up something if u take it off and tear it down let soak in solvent than blow air thru body to dry and clear passages dont mess with adj

Posted on Sep 24, 2009

agent91
  • 2100 Answers

SOURCE: i have a briggs and stratton 14 hp ohv engine on

It sounds like you are putting it into choke mode. The choke is usually all the way up on tractors. And it will make it backfire and flood out. Just rev it high enough to work and don't go into the choke mode. hope this helps.

Posted on Apr 21, 2010

  • 146 Answers

SOURCE: starter gear doesn't move up to engage flywheel gear when started

The solenoid does two things -- it closes an electrical contact to run the starter motor, and also pulls a lever to slide the motor gear up to engage the flywheel. Since the contact is closing, the solenoid itself must be OK, but the lever could be broken, or the sliding gear could be binding or stripped. Since you're looking at a probable replacement, try cleaning with compressed air, then squirting some WD-40 into the starter gear area - you could get lucky! Otherwise, you can replace the starter/solenoid assembly -- you can find replacements on eBay for about $80. Less expensive but more time consuming is to remove the assembly, disassemble, and replace just the defective parts if you can find them. Good luck! Please rate my answer if helpful, thanks.

Posted on Jul 15, 2010

  • 25 Answers

SOURCE: I have a Scott's riding

These mowers were manufactured by Murray, if you contact the Murray Division of Briggs & Stratton at 800-258-5011 they should be able to assist you further.

Posted on Apr 02, 2011

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1 Answer

What are common causes of flywheel key breakage?


Incorrect valve adjustment, especially on OHV motors that causes a backfire can cause the sheer pin to break. Obviously this saves the motor from worse damage. Also, sudden stops caused by hitting something like a log or stump with engaged blades have broken the pins before. On an older motor I had one sheer because the piston rod was a little loose off the crank and the slop was causing the motor to bind. Obviously this did internal damage but the sheer momentum of the motor spinning a heavy flywheel no suddenly stopping broke the pin. Lastly, the magnets on the flywheel could be hitting the coil pack, binding up causing the pin to snap. Be sure to check if the space is gapped correctly. And don't buy cheap pins or generic pins. There should be no slop whatsoever. You almost have to pound it into the slot. Slop equals a much high ER chance of breaking for no reason at all.

Jul 02, 2014 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Has anyone ever had a problem with the fuel solenoid on the carburetor? Same B & S 20 hp v-twin. If it were malfunctioning could it cause a backfire through the carb?


A bad solenoid on the carb should not cause this. It sounds more like to me the motor is out of time due to a sheered flywheel key. Appears as though the motor is firing while the intake valve is open which is why you are getting a so called backfire through the carb. I hope this has been helpful.

Oct 02, 2013 | Craftsman 42" Briggs Stratton 20 hp Gas...

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

Ran fine. shut off. will not start. tries but backfires


It could be as simple as a sheared flywheel key and/or the valves needing adjustment. The OHV engines that come in lawn and garden equipment these days are notorious for being very picky about the correct valve settings, especially single cylinder engines. Another common problem involves the fuel inlet valve in the carburetor. Not the solenoid valve but the float valve inside - if it doesn't seat properly fuel will overflow the carburetor and enter the engine. Several bad things happen after that - the cylinder can get enough gasoline in it to lock the piston when you try to start it and that can result in the aforementioned sheared flywheel key. The gasoline will also get past the piston and into the crankcase where it dilutes the oil and the result is poor lubrication. one of the first components to suffer from the lack of lubrication is the camshaft, particularly the exhaust valve lobe, which wears down to the point that it does not open the exhaust valve far enough and the exhaust cannot be expelled fully on the exhaust stroke. The leftover gasses then escape from the engine through the carburetor when the intake valve opens, sounding like a backfire but rather than fire coming out the carb you get popping and raw gas blowing out the intake. Check your oil for the odor of fuel. If it smells like gasoline and, perhaps is inexplicably overfilled with oil according to the dipstick, plan on having the carburetor inlet needle and seat replaced, possibly the flywheel key replaced and probably the camshaft replaced. Keep your fingers crossed that it is just the valves needing adjustment.

Aug 14, 2012 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

I have a Craftsman mower powered by a Briggs and Stratton 775 platinum professional series with OHV. A couple of weeks after using my mower, I started it up and I heard a knocking sound I shut it off...


There is the possibility that the valves need adjusting. As you probably know, if they are too far out of adjustment, starting will be difficult and there will be "runnability" issues. The Briggs OHV engines all have adjustable overhead valves. Just remove the little cover stamped OHV, careful with the thin gasket behind it and get a feeler gauge, possibly a Torx head driver and box wrench to do the job. Some of the set screws for the rocker arms have slotted heads maybe. The Briggs site has the instructions for this and ALL the specs on all their engines pertaining to valve clearance on intake and exhaust. Many of their OHV engines also incorporate a compression release feature which correct valve adjustment is critical for it's correct operation. If you need more help or links to the Briggs help (under FAQ), then post back.
Most Briggs OHV engines are set at 1/4" past TDC on the power stroke. Many adjust them at TDC (with both valves closed), but for the sake of the compression release (works off the cam), Briggs specifies 1/4" below TDC on Power Stroke.

Jun 05, 2011 | Craftsman 675 Series 190cc 22" Briggs ...

1 Answer

Have a 15.5 hp craftsman riding mower been running great tryed to start today and all it does is backfires through carb and muffler,,,ive cleaned the carb twice now and still doing it. could it be a...


I feel after reading the symptoms that the valves may need adjusting. Is this a Briggs OHV motor. The valve train is sensitive on these and requires periodic (once a year) adjusting. It is not very difficult. A sticking valve or an ignition timing problem could be the cause of the backfiring. Some good, stong fuel system cleaner (like Berryman B-12 Chem Tool )in a heavy dose mixed with the gas you use can readily clean gum and varnish off a sticking valve. The timing problem is a bit tougher nut to crack. If the flywheel key has sheared and the flywheel has moved even slightly on the crankshaft, timing will be affected (with the symptoms you describe). The intake valve not closing all the way can cause this too. To check the valves, remove the bolts holding the OHV cover on the front of the engine. Don't worry, lots of oil won't pour out. It is stored at the other end of the motor. Pull the plug out and rotate the engine by hand. You will see the valve train in motion and be able to readily tell if the valves are seating. If adjusting the valves doesn't fix this, then you will have to remove the engine cover and examine the area of the crank where the flywheel rests. It is slotted and lines up with the slot on the crank. A metal key helps hold the flywheel in place initially (the crank is tapered there and would hold it anyway)....but the key prevents the engine from trying to continue to run if the mower blades strike an immovable object. Instead of the crank breaking, the metal key does. Post back if needed. I am here to help.

Jan 26, 2011 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

I have a 12.5 hp Briggs lawn trator that has a good spark, fuel, compression but will not start. I tried to use starter fluid with no luck. When engine cranks, carb intake has vacumn and some smoke comes...


Since the engine is newer, I presume it has an OHV train. The valves may need adjusting. Also,the engine may be out of time. A sheared flywheel key (not too hard to fix) may be the timing culprit there. Has the mower blades ever struck anything besides the usual yard growth?
Remove the engine's top cover and look down the slot in the side of the crankshaft alongside the flywheel for the key that holds it in place. If the slot in the flywheel isn't lined up with the slot in the crankshaft, then it is out of time and won't start. There are many tutorials and specification charts for Briggs OHV valve adjustment available. Post back as needed.

Jan 11, 2011 | Mtd Garden

1 Answer

Engine won't start and backfires


Did you loosen the coil when you changed the key? Check the setting between the flywheel and the coil. !0,000ths, I think.

May 17, 2010 | Briggs & Stratton Briggs Stratton Intek V...

2 Answers

Backfires through the air cleaner


This usually means a bent or sheared key in the flywheel. Remove the shroud exposing the flywheel buy a 6" flywheel puller and remove the nut for the flywheel and attach the three jaw puller remove the flywheel and replace the flywheel key. The only other thing that causes this popping through the carb is a burnt intake valve this is a job for a lawn mower shop.

Sep 30, 2009 | Garden

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