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I have a nine horse power briggs and Stratton mower. It will run for about five minutes till hot and then dies. When I restarted it blows a huge puff of white smoke. I change the spark plug And cleaned the carburetor. It seems like there's oil leaking from the carburetor with gasoline Also oily substance leaking from muffler. What do I do? Thanks

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  • 171 Answers

Oil level may be too much. ck. owners manual for correct oil level and adjust accordingly.

Posted on Jun 23, 2013

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Posted on Jan 02, 2017

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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

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SOURCE: lawn mower blowing out white smoke

Change the oil...it is diluted with water or gas

Posted on Apr 21, 2009

  • 1 Answer

SOURCE: Lawn Mower smoking/mufler leaking oil

I have a yardman lawn mower that is two years old. It is now blowing oil out the exhaust and also blue smoke. Any idea what is wrong?

Posted on Apr 23, 2010

rycgl
  • 1545 Answers

SOURCE: HI there, I got

There could well be a build up of sediment and debris in the main jet to the carburetor. It is easy to get to and clean. It is the brass bolt that holds the lower float bowl onto the main body of the carburetor. To clean it, drain your gas. Remove the bolt and external washer UNDER the carburetor bowl. Clean out the bowl of any sediment and/or water. To clean the brass bolt, use no metal objects. Carb/Choke aerosol spray cleaner will do the job. Pay close attention to the hole in the bottom of the bolt and the very small holes about 2/3 of the way up the bolt. Clean till shiny with holes cleared and reinstall. Your fuel flow problem and shut off condition may be solved.

Posted on Jun 05, 2011

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