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Eng stalls or runs rough under load

Eng starts runs for short or long time when ac cuts in eng runs rough somtimes stalls sometimes picks up and keeps running have changed fuel filter cant find any broken fuel lines

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You may have a stuck float or a blocked jet. Remove line from the carburetor and check to see if you have gas flow from the line. When opening the petcock, you should see gas coming from the gas line, if not, check the petcock. If you are not that handy with machines, it's recommended you bring the lawn mower to a certified mechanic. But if you are, the next step would be to remove carburetor and disassemble the float housing. Check to make sure that there is nothing in the float housing (the bowl) that would keep it from working, careful you don't lose or bend the needle. If that is fine, you may want to use a can of compressed air to blow out the jets. Once you have cleared all the holes and cleaned out the bowl, re-install the carburetor and give it a shot. My recommendation to keep this from happening again, is to first put gas stabilizer in tank, and second, when putting mower away for the winter, close petcock and run mower until it dies from lack of gas. Good luck!

Posted on Apr 20, 2014

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Posted on Jan 02, 2017

  • 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
  • 1040 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

  • 32 Answers

SOURCE: Mower idles rough and stalls at times. Also blows

look by the carboreter and there is a little screw with a spring. turn the screw a half turn and try to start it, then try another half turn, and keep expirementing.

Posted on Jun 13, 2009

  • 41 Answers

SOURCE: Briggs & Stratton 4.5 hp running rough...too much fuel

Hi did you squeze excess oil from filter so it can **** air in??

Posted on Aug 04, 2009

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