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Mower running rough

I have a briggs and stratton 40 quicksilver 46s on a flymo push mower and it is running fast/slow,also chucking out a bit of smoke,also using alot of petrol,any ideas?ta

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  • Samuel Charles Spriggs May 11, 2010

    Have you performed routine maintenance on the engine lately -- like air filter cleaning/replacement?



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  • 41 Answers

This engine may need overhauling,You seem to have either bad valves or rings, or both.

Posted on May 13, 2009


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Hi,I have a Briggs and Stratton Quicksilver 46SD, runs eratically and smokes

Hi,first take the old gas out of the mower and reflll with new.Restart mower and let run for two to three mins.....If it's still smoking you have bad piston rings.

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How can i fix my slow running lawnmower

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I have a quicksilver 46s petrol need oil in the petrol ???

No it is either a Briggs engine or a Techumseh engine neither of which is a two stroke, so check the oil in the engine and run the machine on un leaded fuel.

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1 Answer

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1 Answer

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Your carb needs to be taken apart and cleaned

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1 Answer

Flymo quicksilver 46s keeps cutting out

make sure button not cracked also fuel filter sits in bottom of tank get you a peice of coat hanger and fish it out just pulls off the end clean it good and also double check your carb sometime you can lose a gasket and it will cause similar issues? let me know if any of this helps ? can also tell you how to adjust high speed side of carb if all else fails?

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1 Answer

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

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