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Cub cudet 31p7770299e1 briggs stratton engine

Engine start and run up to 1/2 speed thin spit or backfire thro carburetor from 1/2 to full speed , just did a valve job , set valves , clean carburetor , clean out gas tank and line new filter, check key in flywheel , didn't help,stell spit and backfires out of carburetor , what to check nex???

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  • Cub Cadet Master
  • 1,917 Answers

Only thing left is valve seat is loose and poping loose at a certain rpm causing backfire threw carb has to be intake valve

Posted on Jun 07, 2014

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
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Posted on Jan 02, 2017

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ccrozier_agr
  • 36 Answers

SOURCE: 2 1/2 Briggs......doesn't run smoothly....surges at all speeds.

Hi, Check that you have the correct spark plug fitted or fit a new one as it sounds like your plug is getting hot then shorting out.
Sometimes the magnito can do this as well. but I would start with the plug.

Posted on Nov 29, 2008

  • 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

jj505
  • 195 Answers

SOURCE: Have a Briggs & Stratton lawn mower engine, 4.5

Is Blade new or causeing vibration .Chge blade,

Please rate Thank you jj505

Posted on Mar 30, 2009

#1 Taper
  • 1041 Answers

SOURCE: Engine only runs with choke full on. Dies when off full choke.

Hi Dave, it sounds crazy, but try this. Check your gas cap. It could be clogged, causing a vacuum to occur in the tank, and therefore not allowing the carb. to take on gas. It usually take 10-15 min. for this to occur. The next time you run the mower and it starts to stall out, loosen the gas cap and see if it begins to run again. If it does, then you know that the gas cap is clogged.

Jim

Posted on Jun 05, 2009

  • 1 Answer

SOURCE: Cleaned the Briggs & Stratton Riding Lawn

kehmahcliff:
It looks like that your valves need to be maintenanced. This can be done by small engine repair shops. They should have the proper tools.

Also the "timing" of the spark and the fuel injection could be a problem. I hope this helped you.

Greetings Joe

Posted on Sep 30, 2009

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I have a Briggs & Stratton Vanguard 16 HP motor. It idles fine and it runs OK at high RPMS. But it backfires thru the carburetor during accelerating. Any suggestions?


On some float-type carburetors, you can adjust the air-fuel mixture and engine speed at idle. Check for an idle speed screw designed to keep the throttle plate from closing completely, and an idle mixture screw that limits the flow of fuel at idle. If your carburetor contains these screws, proceed below.
  1. With the engine off, remove the air filter and air cartridge.
  2. Locate the idle mixture screw and turn it clockwise until the needle lightly touches the seat. Then, turn the screw counterclockwise 1-1/2 turns.
  3. If your carburetor has a main jet adjustment screw at the base of the float bowl, turn the screw clockwise until you feel it just touch the seat inside the emulsion tube. Then, turn the screw counterclockwise 1 to 1-1/2 turns. Replace the air cleaner assembly and start the engine for final carburetor adjustments.
  4. Run the engine for five minutes at half throttle to bring it to its operating temperature. Then, turn the idle mixture screw slowly clockwise until the engine begins to slow. Turn the screw in the opposite direction until the engine again begins to slow . Finally, turn the screw back to the midpoint.
  5. Using a tachometer to gauge engine speed , set the idle speed screw to bring the engine to 1750 RPM for aluminum-cylinder engine or 1200 RPM for engine with a cast-iron cylinder sleeve.
  6. With the engine running at idle , hold the throttle lever against the idle speed screw to bring the engine speed to "true idle." Then, repeat the idle mixture screw adjustments from Step 4 to fine-tune the mixture .

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1 Answer

Why does my Briggs & stratton 24 hp intek v-twin **** and pop at full throttle causing black smoke out of the exhaust?


Does it do this when you start it or turn it off? If yes to either one you must install a gas chock in the fuel line. It's a valve. You turn the valve off and let the engine run out of gas. When starting you turn it on obviously. By draining the carburetor of gas it won't overload anymore and backfire when turned on/of f.

Sep 17, 2014 | Cub Cadet Garden

1 Answer

Cub cudet 31p7770299e1 briggs stratton engine


check and see if intake valve seat is loose as motor gets hotter condition worsens

Apr 23, 2013 | Cub Cadet Garden

2 Answers

All of a sudden started backfiring. What could be the cause?


A Back-fire or backfire is an explosion produced by a running internal combustion engine that occurs in the air intake or exhaust system rather than inside the combustion chamber.

In engines with a carburetor, this is often caused by the carburetor being gummed up from unused fuel. Many people don't know that new gas with ethanol can't sit unused for months without going bad. If you look in a tank of gas that has been sitting a while, there will be puddles of gunk on the surface. That gunk really clogs up carburetors, making the engine not run properly.

Usually this can be fixed by dumping all the gas, taking off the carb, and cleaning it out. Or you can take it to a small engine shop if you aren't good with tools. For all small engine tools (lawn mowers, tillers, etc) you need to let the gas run out before storing them if they will sit unused for more than a few weeks, or you will have to clean the carb again.

Hope this info helps!
John Vickers

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1 Answer

I have a briggs and stratton 14 hp ohv engine on my murray lawn mower it starts and runs good until i go to full throttle or engage the blades then it seems to flood out and start backfiring i can lower...


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.

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1 Answer

Have a 20hp vanguard on a go-devil long tail motor. engin runs at idle speed then when i put the propeller into the water it stalls. if i pull the choke and give full throttle it will run some and backfire


These engines seem to have problems maintaining the correct valve lash settings. try taking the valve covers off and checking the valve/pushrod clearance.on tdc compression stroke it should be .001-.003 clearance. then check exhaust stroke tdc on exhaust stroke. clearance should be same on the other valve then. hope this cures your problem.

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