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I have a Sears mower with a 190cc B & S engine. It will not stay running. It starts and then surges up and down like you were controlling a throttle and then finally just slows down and quits.

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  • Sears Master
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There is a blockage in the carburetor. you will need to take it off and clean it real good with carburetor cleaner. go ahead and put a new needle and seat in it while you are in there it should run like a new one.

Posted on Apr 22, 2017

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6ya6ya
  • 2 Answers

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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

  • 376 Answers

SOURCE: Toro 6.5 hp 9 year old mower. Starts Ok; surges

Sounds like your carburetor needs to be cleaned out. The surging is usually a sign of running to lean (not getting enough gas) because of possible water, rust, gum, varnish or trash in your carb. Hope that helps.....

Posted on May 17, 2009

panilling9
  • 284 Answers

SOURCE: Mower petrol engine runs much too fast

check your governer and spring to make sure it isnt in a bind or being hindered by something
make sure it moves freely

Posted on May 26, 2009

carlsbiz
  • 1124 Answers

SOURCE: My Sears riding mower chokes itself out after warmed up,

Careful with the high octane.. That can burn a hole in the piston..

It might be fludding.. At the bottom of the carb should be a bowl.. One bolt at the bottom.. Take it off and clean it.. Spray some carb cleaner up in there where the float is..

If that dont do it --

Maybe the float is bad & taking in fluid..

If it has sat for long piriods of time - the carb might need to be cleaned & rebuilt..

When gass sits in there for a long time it shalacks and wont work correctly..

Pop off the carb & take to your local small eng shop. Shouldnt cost to much..

Posted on Jul 09, 2009

  • 3 Answers

SOURCE: Lawn-Boy Insight Series 21-Inch 190cc 650 Series Gas Powered Engine Variable Speed Self-Propelled Lawn Mower: my engine will only stay running for about 3 secon...

Maybe the engine is running with the fuel from the primer bulb (about few seconds), the carburator is not working and need to be removed checked and cleaned, the most common fail is a jet clogged.

Posted on Dec 16, 2010

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